Kodi Dendrite Formation ndi chiyani?

Mapangidwe a dendrite amafotokoza kukula kwa mtengo-monga makristalo opangidwa ndi ma electrochemical m'mabatire ndi makina ena. Masingano amenewa-amapanga zooneka ngati kapena zomangira ma zitsulo pamene ma ma ion amawunjikana mosiyanasiyana pa ma elekitirodi pamene akuchangitsa ndi kutulutsa.

Chodabwitsachi chimachitika m'mafakitale osiyanasiyana a batri koma chimakhala ndi zovuta kwambirimabatire a lithiamu, kumene ma dendrites amatha kuboola kudzera pa olekanitsa ndi kuyambitsa mabwalo amkatikati. Kumvetsetsa chifukwa chake komanso momwe zidazi zimakhalira kwakhala kofunika kwambiri chifukwa makina osungira mphamvu amapitilira kuchulukira komanso kuthamangitsidwa mwachangu.

Ma dendrites amapanga kudzera mu njira ya electrodeposition yoyendetsedwa ndi thermodynamic ndi kinetic factor. Battery ikapsa, ma ion achitsulo amadutsa mu electrolyte kupita ku anode. Pazifukwa zabwino, ma ion awa amatha kuyika mofanana pamtunda wa electrode. Komabe, pali zinthu zingapo zomwe zimasokoneza kaphatikizidwe kofananako.

Kusakhazikika kwapamtunda kumapangitsa kuti magetsi azichulukira kwambiri. Minda yotereyi imakopa ma ion ambiri kumalo enaake m'malo mowafalitsa mofanana. Katundu kakang'ono kakapangika, kumayamba-kudzikulitsa-nsonga ya kukula kwake kumakhala ndi magawo amagetsi amphamvu kuposa malo athyathyathya, zomwe zimafulumizitsa kukula komweko.

Njirayi imakula kwambiri pakachulukidwe kakali pano. Kafukufuku wochokera ku yunivesite ya Maryland pogwiritsa ntchito ma transparent optical cell anasonyeza kuti pakachulukidwe kakali pano kupitirira 87 mA/cm², dendrite morphology inasintha kuchoka pa mossy yafulati kupita ku singano yakuthwa{2}ngati mipangidwe. Nthawi yopita kudera lalifupi lamkati idatsika molingana ndi kuchuluka kwachulukidwe komweku, kutsika kuchokera ku maola angapo pa 10 mA/cm² kufika pafupifupi mphindi 30 pa 110 mA/cm².

Kutentha kumagwira ntchito ziwiri pakupanga dendrite. Kutentha kwapansi kumachedwa kufalikira kwa ion, kupanga ma gradient ndende pafupi ndi ma elekitirodi pamwamba. Izi zimapangitsa kuti ma ion asungidwe mosavuta pama protrusion omwe alipo m'malo mopeza malo atsopano opangira ma nucleation. Mosiyana ndi zimenezi, gawo lolimba la electrolyte interphase (SEI) lomwe limapangidwa pa kutentha kochepa limakhala lolimba komanso losakhazikika, zomwe zimapangitsa kuti pakhale kusiyana kofanana.

Dendrite Formation

Mabatire a lithiamu amakumana ndi zovuta zapadera za dendrite chifukwa chakuchita bwino kwa lithiamu komanso mphamvu zochepa zama electrochemical. Lifiyamu ion mbale pa anode pa kulipiritsa, iwo ayenera intercalate mu dongosolo graphite. M'malo mwake, ma ion owonjezera omwe sangathe kuyamwa mwachangu mokwanira amawunjikana pamtunda ngati zitsulo za lithiamu.

Gawo la SEI limakhudza kwambiri njirayi. Filimu yotetezayi imapanga mwachibadwa pamene electrolyte imachita ndi lithiamu anode. Unifolomu, wandiweyani SEI amawongolera ngakhale kuyika kwa lithiamu. Komabe, SEI imasweka ndikusintha mosalekeza pakachaji{3}}nthawi yotulutsa chifukwa cha kusintha kwa ma elekitirodi. Malo aliwonse ophwanyika amakhala malo omwe angakhale dendrite nucleation.

Kafukufuku wofalitsidwa mu Nature Materials mu 2024 adapeza njira ziwiri zosiyana zopangira ma dendrite mu -mabatire olimba a lithiamu pogwiritsa ntchito ma electrolyte a Li₇La₃Zr₂O₁₂ (LLZO). Njira yoyamba imakhala ndi-yopanda ma lifiyamu plating pa ma electrode-electrolyte interfaces. Chachiwiri chimachitika kudzera pakuchepetsa kwa Li⁺ m'malire a tirigu mkati mwa electrolyte yolimba yokha. Pakati pa magawo awiriwa, ochita kafukufuku adawona nthawi yomwe kukula kwa dendrite kunayima asanayambirenso.

Njira yoyambira imasiyana ndi kufalitsa. Kafukufuku wochokera ku yunivesite ya Oxford anasonyeza kuti kuyambika kwa dendrite mu mabatire olimba-kuyamba pamene lithiamu ilowa m'mabowo apansi panthaka polumikiza ma microcracks. Pamene ma pores awa akudzaza, kupitiriza kulipira kumamanga kupanikizika chifukwa cha kuchedwa kwa lithiamu extrusion kubwerera pamwamba. Kupanikizika kumeneku pamapeto pake kumayambitsa kusweka. Ming'alu ikayamba kufalikira, kufalikira kumachitika kudzera m'mphepete mwa mphero-pomwe lithiamu imayendetsa ming'aluyo kumbuyo osati kumapeto.

Mipata ya kachulukidwe kakali pano imasiyanasiyana ndi mtundu wa electrolyte. Ma electrolyte amadzimadzi okhazikika nthawi zambiri amawonetsa mapangidwe a dendrite pamwamba pa 0.2-2.0 mA/cm², pomwe ma elekitirodi olimba amatha kupirira kachulukidwe apamwamba apano asanalephere. Kafukufuku pa yunivesite ya Oxford anapeza kuti densifying argyrodite (Li₆PS₅Cl) olimba electrolyte kuchokera 83% kuti 99% wachibale kachulukidwe anawonjezera zovuta panopa kachulukidwe kuchokera pansi 2 mA/cm² kuti 9 mA/cm² popanda dendrite mapangidwe.

Ma dendrites amasokoneza mabatire kudzera munjira zingapo zolephera. Chowopsa kwambiri chimachitika pamene dendrite imakula kwathunthu kudzera pa olekanitsa, ndikupanga mlatho wochititsa chidwi pakati pa anode ndi cathode. Dongosolo lalifupili limapangitsa kuti matenthedwe azitenthedwa m'malo mwake, zomwe zimatha kuyambitsa kutentha kwapakati-kudzidzidzi{3}}zomwe zimatha kuyambitsa moto kapena kuphulika.

Asanafikire kulephera kowopsa, ma dendrites amatsitsa magwiridwe antchito mochulukira. Dendrite iliyonse imawonetsa mawonekedwe atsopano a lithiamu ku electrolyte. Izi zimayendetsa kupangika kwa SEI kosalekeza, kumagwiritsa ntchito lithiamu ndi electrolyte. Pakadutsa motsatizana, izi zimachepetsa mphamvu zomwe zilipo ndikuwonjezera kukana kwamkati.

Ma dendrites amapanganso "lithiyamu wakufa"-madipoziti azitsulo otalikirana ndi magetsi omwe satenga nawo gawo pakuchita kwa electrochemical. Ma dendrites akachoka chifukwa cha kupsinjika kwamakina kapena dzimbiri la electrolyte, amasiya zidutswa zosagwira ntchito izi. Lifiyamu yakufa imayimira kutaya mphamvu kwamuyaya, chifukwa sichingabwezedwe kudzera panjinga wamba.

Kusintha kwa voliyumu komwe kumalumikizidwa ndi plating ya lithiamu ndikuvula kumakulitsa mavutowa. Chitsulo cha Lithium chimadutsa 100% kusintha kwa voliyumu pakati pa zitsulo zake zachitsulo ndi ionic. Kukula ndi kuphatikizika uku kumagogomezera gawo la SEI ndipo zimatha kuwononga olekanitsa, ndikupanga njira zowonjezera zolowera dendrite.

Kutha kwa mphamvu m'maselo osatetezedwa a lithiamu zitsulo kumatha kufika 1-2% pamzere uliwonse pamene ma dendrites amapanga mwachangu. Izi zimasiyana kwambiri ndi-ma cell a lithiamu-ion opangidwa bwino omwe amagwiritsa ntchito ma graphite anode, omwe nthawi zambiri amataya mphamvu ya 0.1% pozungulira kapena kuchepera.

Kuchulukana komweku kumawonekera ngati chinthu chachikulu chomwe chimayang'anira mapangidwe a dendrite. Mafunde okwera kwambiri amakakamiza ma ion ambiri kuti asungidwe pakanthawi kochepa, zomwe zimachititsa kuti ma elekitirodi azitha kuwasamalira mofanana. Ubalewu suli wa mzere{2}}zikuoneka kuti pali mbali yofunika kwambiri yomwe kukula kwa dendrite kumakhalabe kochepa, koma pamwamba pake kumathamanga kwambiri.

Kupangidwa kwa electrolyte kumakhudza kwambiri kutengeka kwa dendrite. Mchere wa mchere umakhudza mayendedwe a ion ndi kufanana kwa magetsi pafupi ndi electrode. Kuchuluka kwa mchere wochepa kumapangitsa madera omwe ma ion akuchepa pomwe ma ayoni sangakwanitse kuyika, zomwe zimalimbikitsa kukula kwa dendritic. Kuyika kwakukulu kumatha kupangitsa kuti kufanane koma kumachepetsa kusinthasintha kwa ionic kapena kukulitsa kukhuthala.

Zowonjezera za electrolyte zimapereka njira imodzi yopondereza. Fluoroethylene carbonate (FEC), mwachitsanzo, imachepetsa pa lithiamu pamwamba kuti ipange LiF-magawo olemera a SEI. Zigawozi zimawonetsa mphamvu zamakina apamwamba komanso kutsika kwamagetsi amagetsi poyerekeza ndi zida zofananira za SEI, zomwe zimathandiza kusunga mawonekedwe ofanana.

Zowonongeka zam'mwamba ndi zowawa zimayambitsa ma dendrites ambiri. Ngakhale zolakwika za nanoscale zimayang'ana minda yamagetsi mokwanira kuti ziyambitse malo osankhidwa. Njira zopangira zomwe zimapanga malo osalala a electrode zimachepetsanso malo a dendrite nucleation. Mofananamo, zonyansa kapena particles ophatikizidwa mu elekitirodi pamwamba akhoza kutumikira monga heterogeneous nucleation mfundo.

Kutentha kwa ma gradients mkati mwa selo kumapanga ma kinetics osiyanasiyana. Malo otentha amakhala ndi mayendedwe othamanga ndi ma ion, zomwe zimapangitsa kuti zigawo za dendrite{1}}zikhale zovutirapo ngakhale ngati kachulukidwe kake kamakhala kocheperako. Njira zoyendetsera mabatire zomwe zimatsimikizira kugawa kwa kutentha kofanana zimathandiza kuchepetsa izi.

Mkhalidwe wa charger pomwe batire imapuma imakhudzanso kukula kwa dendrite. Kugwira ma cell pamagetsi okwera kwa nthawi yayitali kumalimbikitsa mapangidwe a dendrite, makamaka m'maselo a lithiamu iron phosphate (LiFePO₄). Izi zikufotokozera chifukwa chake njira zoyendetsera zoyandama zasinthira kumayendedwe ocheperako poyerekeza ndi machitidwe azaka khumi zapitazo.

Kuzindikira kwachikale kwa dendrite kumadalira positi-kuwunika kwa kufa{1}}kutsegula ma cell olephera ndikuwunika ma elekitirodi ndi ma electron microscopy. Ngakhale ndi chidziwitso, njira iyi siyingalepheretse zolephera kapena kutsatira chisinthiko cha dendrite munthawi yeniyeni.

Njira zotsogola zamakhalidwe tsopano zimathandizira kuwona kwa operando. Ofufuza m'mabungwe angapo apanga njira pogwiritsa ntchito ma electrolyte owonekera kapena mapangidwe apadera a cell. Yunivesite ya Maryland idapanga ma cell a kuwala komwe maelekitirodi onse amakhala ndi zitsulo za lithiamu, zomwe zimalola kuwonetsetsa kwachindunji kwa kukula kwa dendrite kudzera pawindo lowonekera pakulipira.

X-ray computed tomography (XCT) imapereka zithunzi -zowoneka ngati dendrite m'kati mwa maselo osasinthika. Ma Synchrotron X-ray amapereka njira yokwanira kuti azitha kuyang'anira mapangidwe a dendrite pa microscale mkati mwa batire. Ntchito yaposachedwa yofalitsidwa mu Nature idagwiritsa ntchito operando XCT kuwona momwe lithiamu imalowetsa ma electrolyte a ceramic, kuwulula kupangika kwa mng'alu ndi kufalikira kwa lifiyamu.

Electrochemical impedance spectroscopy (EIS) imapereka njira yosadziwika bwino koma yosakhala-njira yodziwira zowononga. Pamene dendrites akukula, amasintha malo ogwira ntchito pamtunda ndi kukana kwa electrode. Zosintha izi zimawonekera ngati kusintha kwa mawonekedwe a impedance. Ofufuza asintha njira zowunikira ma cell a droplet kuti apangitse kusinthika kwapang'onopang'ono kudzera mumiyezo ya EIS, kupereka chenjezo loyambirira la mapangidwe a dendrite osatsegula selo.

Nuclear magnetic resonance (NMR) spectroscopy ndi kujambula amapereka mwachindunji mankhwala. Tracer-NMR yosinthanitsa imatha kusiyanitsa pakati pa lithiamu plating m'malo olumikizirana ndi kuchepetsa kuchuluka kwa electrolyte. Imaging resonance imaging (MRI) imatsata kufalikira kwa malo a dendrite ndi kuchuluka kwa kukula, kuthandiza ofufuza kumvetsetsa momwe magawo osiyanasiyana a cell amapangira ma dendrites nthawi zosiyanasiyana.

Ma sensa a fiber optic amayimira njira yomwe ikubwera. Makanema opindika a Fiber Bragg grating (TFBG) omwe amayikidwa pafupi ndi ma elekitirodi amazindikira kusintha kwa mayendedwe ndi kukula kwa dendrite pamalo olumikizirana nanoscale popanda kusokoneza batire. Ma ultrasensitive optical resonances amathandiza zenizeni-kuyang'anira nthawi ya lithiamu deposition kinetics ndi dendrite evolution.

Dendrite Formation

Njira zingapo zimayang'ana kuponderezedwa kwa dendrite, nthawi zambiri zimagwira ntchito mogwirizana zikaphatikizidwa. Palibe njira imodzi yomwe idachotseratu ma dendrites pansi pazikhalidwe zonse zogwirira ntchito, koma njira zingapo zimakweza kwambiri kachulukidwe kakang'ono kamakono.

Ma electrolyte olimba poyambirira adawoneka ngati zopinga zakuthupi motsutsana ndi ma dendrites. Komabe, kafukufuku adawonetsa kuti ma dendrites amalowetsanso zinthu zolimba, zomwe zimakula kudzera m'malire ambewu kapena ming'alu. Ubwino wa ma electrolyte olimba suli pakupewa kwathunthu koma kumafuna kupsinjika kwamakina apamwamba asanafike dendrite kulowa. Kukongoletsa kachulukidwe ka electrolyte ndi kapangidwe ka tirigu kumatha kukulitsa kukana kwake kulowa.

Zomangamanga zitatu-zooneka ngati ma elekitirodi zimasintha kachulukidwe kameneka. M'malo moyika pamalo athyathyathya, lithiamu imadzaza mawonekedwe a porous a 3D host material. Izi zimakulitsa malo abwino kwambiri kuchoka pa 5.2 × 10⁻³ m²/g pazithunzi za lithiamu kufika pa 2.6 m²/g pa scaffolds zamatabwa za carbonized. Dera lowonjezereka limachepetsa kuchulukira komweku komweko molingana, ndikulisunga pansi pa chigawo cha dendrite nucleation. Kuyika zinthu za lithiophilic ngati malata kumapangidwewa kumapangitsa kuti pakhale ma nucleation omwe amakonda kwambiri, omwe amalimbikitsa mayunifolomu, osapanga -dendritic deposition.

Zomangamanga za SEI zomwe zimagwiritsidwa ntchito musanayambe kupalasa njinga koyamba-zingayambitsenso-kupangidwa kwa SEI yofanana yachilengedwe. Zinthu zosiyanasiyana zakhala zikuyenda bwino, kuphatikiza LiF-zovala zolemera, ma polima layers, ndi makanema ophatikizika achilengedwe-achilengedwe. SEI yochita kupanga yabwino imaphatikiza ma ionic conductivity apamwamba, kutsika kwamagetsi amagetsi, ndi mphamvu zamakina zokwanira kupondereza kulowa kwa dendrite kwinaku mukusintha pakusintha kwa voliyumu.

Electrolyte engineering imayankhira mapangidwe a dendrite kuchokera kumbali yothetsera. High-concentration electrolytes (yomwe nthawi zina amatchedwa "solvent-mu-mchere" system) amachepetsa kupezeka kwa ma molekyulu osungunulira aulere, kusintha kapangidwe kakusungunuka kozungulira ma ion lifiyamu. Kusintha uku kungalimbikitse kuyika kofananako. Ma Ionic liquid electrolyte samatha kuyaka-kuphatikizana ndi mawonekedwe osiyanasiyana omwe amatha kupondereza ma dendrites, ngakhale kukhuthala kwawo kumabweretsa zovuta.

Ma protocol a pulsed charger posachedwa adawonekera ngati njira yothandiza modabwitsa. M'malo mogwiritsa ntchito nthawi zonse, ma pulsed protocol amasinthana pakati pa nthawi yolipiritsa ndi nthawi yopuma. Panthawi yopuma, ma gradients amapumula ndipo malangizo a dendrite amatha kusungunuka pang'ono kukhala yankho. Kafukufuku wasonyeza kuti MHz-ma frequency pulsed currents amachulukitsa kachulukidwe wamakono ndi chinthu sikisi-kuchokera pafupifupi 1 mA/cm² kufika 6.5 mA/cm²-mu mabatire olimba-.

Pressure application imapereka njira ina yamakina. Kugwiritsa ntchito mphamvu yopondereza yofananira ndi ndege ya elekitirodi kumalepheretsa kukula kwa dendrite. Ofufuza a MIT adawonetsa kuti amatha kuwongolera kukula kwa dendrite pogwiritsa ntchito ndikutulutsa kukakamiza, zomwe zimapangitsa kuti ma dendrites azigzag mogwirizana ndi mphamvu. Ngakhale kukakamiza sikuthetsa mapangidwe a dendrite, kumawalepheretsa kudutsa pakati pa ma electrode.

Kusintha kwa mabatire olimba-kunali kolimbikitsidwa ndi chiyembekezo chothetsa vuto la dendrite. Zoyembekeza zoyamba zimaganiza kuti ma electrolyte a ceramic olimba amatha kulepheretsa kulowa kwa dendrite. Zowona zinakhala zovuta kwambiri.

Ma electrolyte olimba amalephera chifukwa cha kuthyoka kwa makina m'malo molola kuti ma dendrites angodutsa. Njirayi imayambira pa zolakwika-zotupa, malire a njere, kapena zosokoneza. Lithiamu imayika mu zolakwika izi, ndipo lithiamu ikachuluka, kupsinjika kwamakina kumakulirakulira mpaka ming'alu ya ceramic. Crack ikangoyambika, lithiamu imafalikira kudzera munjira-zotsegula zomwe ofufuza a Oxford apeza.

Zida zosiyanasiyana zolimba za ma electrolyte zimawonetsa kukana kosiyanasiyana kwa dendrite-kuthyoka kwawoko. Garnet-mtundu wa ma electrolyte monga LLZO amawonetsa kulonjeza chifukwa cha kukhathamiritsa kwawo kwa ma ionic, koma mawonekedwe awo amagetsi amathandizira kupanga ma dendrite. Mapangidwe amagetsi amalola ma elekitironi kuti afikire nsonga za dendrite, kupitilizabe kuyika kwa lithiamu. Kuchepetsa madutsidwe amagetsi awa, ngakhale kukhalabe ndi ma ionic apamwamba, kumathandiza kupondereza ma dendrites.

Ma electrolyte olimba a Sulfida{{0}ochokera ku Li₆PS₅Cl (argyrodite) amawonetsa machitidwe osiyanasiyana. Ndiwofewa mwamakina kuposa ma ceramic ceramics, zomwe zimapangitsa kuti ma dendrite akule kudzera mukusintha kwa pulasitiki m'malo mothyoka. Komabe, kachulukidwe kawo kamagwira ntchito bwino kwambiri-kuchulukitsa kachulukidwe ka argyrodite kufika pa 99% kumathandizira kuti dendrite{5}igwire ntchito mwaulere pamakachulukidwe apano oyenera-magalimoto ochajitsa amagetsi.

Interface engineering pakati pa lithiamu zitsulo anode ndi ma electrolyte olimba amawongolera njira ina yolephera. Kusalumikizana bwino kumapangitsa kuti pakhale zocheperako pomwe kusachulukira kwanuko kumaposa avareji yapadziko lonse lapansi potengera kukula kwake. Malo ochepetserawa amakhala malo oyambira a dendrite. Kuyika zolumikizirana-makanema owonda a polima, ma aloyi azitsulo, kapena zinthu zophatikizika{4}kutha kupititsa patsogolo kukhudzana ndi kufalitsa masiku ano mofanana.

The critical current density (CCD) ya dendrite formation mu solid-mabatire a state akuyenera kupitilira 5 mA/cm² pakugwiritsa ntchito magalimoto amagetsi. Ma electrolyte olimba ambiri amalephera kukwaniritsa cholingachi pansi pamikhalidwe yofananira, chifukwa chake kafukufuku wozama munjira zophatikizika pogwiritsa ntchito kachulukidwe, kupanikizika, kuthamanga kwapang'onopang'ono, ndikusintha mawonekedwe.

Ngakhale mabatire a lithiamu amalamulira kafukufuku wa dendrite, machitidwe ena amakumana ndi zovuta zofanana. Mabatire achitsulo a Zinc amakumana ndi mapangidwe a zinc dendrite, ngakhale ali ndi mawonekedwe osiyanasiyana. Zinc dendrite nthawi zambiri amawoneka ngati moss-monga kapena ndevu m'malo mwa singano zakuthwa, zomwe zimawonetsa zinki zosiyanasiyana zamagetsi zamagetsi.

M'mabatire amadzi a zinki, mapangidwe a dendrite amadalira kwambiri pH ya electrolyte ndi ndende ya zincate. Kuchuluka kwa zincate pamwamba pa 0.4 M mu 7 M KOH ma electrolyte amachepetsa kukula kwa dendrite, koma ma electrolyte ozungulira amawonjezera kusintha kwa haidrojeni. Ma electrolyte interphase pa zinki amakhala ndi zinthu zosiyanasiyana kuposa lithiamu{4}}makamaka zinc oxide ndi zinc hydroxide-zokhala ndi ma mechanical ndi ma ionic transport.

Sodium zitsulo anode amasonyeza khalidwe la dendrite lofanana ndi lithiamu, ngakhale kuti dendrites nthawi zambiri amakula pang'onopang'ono chifukwa cha kuchepa kwa sodium. Chitsulo cha Magnesium, chomwe chinaganiziridwa kuti sichingagwirizane ndi mapangidwe a dendrite, posachedwapa chasonyezedwa kuti chimapanga ma dendrites pansi pazifukwa zina, makamaka pazitsulo zamakono pamwamba pa 0.2-0.3 mA / cm² kutengera electrolyte.

Ngakhale ma silicon anode mu mabatire a lithiamu-ayoni amatha kukhala ndi lithiamu dendrite. Pakulipira, silicon imakula pafupifupi 300%, ndikuphwanya gawo la SEI. Kupyolera mu ming'alu iyi, ayoni a lithiamu amatha kuchepetsedwa kupanga zitsulo za lithiamu dendrites m'malo mophatikizana ndi silicon monga momwe adafunira. Makinawa akuyimira kulephera kwa haibridi kuphatikizira kukulira kwa voliyumu ndi ma electrochemical deposition.

Zofanana pamakinawa zikuwonetsa kuti mfundo zapadziko lonse lapansi zimayendetsa mapangidwe a dendrite. Kachulukidwe kakali pano, kusiyanasiyana kwapadziko lapansi, komanso mawonekedwe amitundu yolumikizana amawonekera ngati zinthu zowongolera mosasamala kanthu za chitsulo chapadera. Njira zopewera zomwe zimapangidwira dongosolo limodzi nthawi zambiri zimasamutsidwa, ndikusinthidwa, kupita kwa ena.

Kupita patsogolo kwaposachedwa kwasintha kumvetsetsa kwa mapangidwe a dendrite. Kuzindikiritsidwa kwa njira zosiyana zoyambitsira ndi kufalitsa m'mabatire olimba-kuyimira kusintha kwamalingaliro. Zitsanzo zam'mbuyomu zinkakhala ndi njira imodzi yopitilira, koma kuzindikira izi ngati magawo osiyana kumathandizira kulowererapo komwe kumatsata pagawo lililonse.

Udindo wa mawonekedwe a amorphous motsutsana ndi crystalline dendrite wadziwika. Kafukufuku waposachedwa wa NMR adawonetsa kuti ma dendrites poyambilira amapangidwa ngati ma amorphous omwe pambuyo pake amawala. Chilema cha ma electrolyte olimba ndi momwe mabatire amagwirira ntchito amatsimikizira kusanja pakati pa njira ziwirizi. Kupeza uku kumatsegula mwayi wopanga zinthu zomwe zimakonda zosinthika za amorphous kuposa ma crystalline dendrites okhazikika.

Mitundu yophunzirira makina tsopano imaneneratu za kukula kwa dendrite ndikulondola kowonjezereka. Pophatikiza zinthu zosiyanasiyana{{1}kuchulukirachulukira, kutentha, kuchuluka kwa ma electrolyte, mawonekedwe a pamwamba{2}}mu convolutional neural networks, ofufuza amapeza zolosera zabwinoko kuposa momwe zimakhalira kale-zotengera ma model okha. Zida izi zimathandizira kuzindikira mawindo ogwiritsira ntchito bwino komanso kuphatikiza kwazinthu.

Mamolekyu apuloteni adatuluka ngati njira yosayembekezereka koma yothandiza ya dendrite kupondereza. Mapuloteni ena, akawonjezedwa ku ma electrolyte, amadzipangira okha pazitsulo za lithiamu, makamaka pa nsonga za dendrite. Kupyolera mu kusintha kosinthika kuchokera ku -helix kupita ku -mapangidwe a mapepala, mapuloteniwa amasintha kagawidwe ka magetsi m'deralo, kulimbikitsa kuyika mayunifolomu. Njira yolimbikitsirayi-yokhala ndi moyo wautali komanso kuchita bwino kwambiri pakuyesa kwa labotale.

Thermodynamic chimango chomvetsetsa mapangidwe a dendrite chakhwima. Ofufuza tsopano azindikira kuti zotchinga zonse za kutentha ndi thermodynamic zimagwira ntchito yofunika kwambiri pakuzindikira ngati lithiamu imayika mofanana kapena imapanga ma dendrites. Kumvetsetsaku kumawongolera njira zosinthira magawowa kudzera mu kapangidwe kazinthu ndi momwe amagwirira ntchito.

Dendrite Formation

Ngakhale zikuyenda bwino, kutsatsa kwa mabatire a dendrite{0}}kumakhalabe kovuta. Kusiyana pakati pa ziwonetsero za labotale ndi kupanga zochuluka kumakhudzanso njira zokulirapo ndikusunga kuwongolera. Chilema chimodzi cholimba cha electrolyte kapena ma elekitirodi amatha kukhala ma dendrites, ndikupangitsa kuti kupanga kukhale kofunikira kwambiri.

Kuganizira za mtengo kumakhudza njira zomwe zimafikira kupanga. Zina mwa njira zabwino kwambiri zochepetsera ma dendrite{1}}monga zolondola{2}}zopangidwa ndi ma elekitirodi a 3D kapena apamwamba-ma electrolyte olimba kwambiri-zimakweza kwambiri ndalama zopangira. Kulinganiza kuwongolera magwiridwe antchito motsutsana ndi kuthekera kwachuma kumafuna kukhathamiritsa kosalekeza.

Kukhazikika-panjinga kwanthawi yayitali kukufunika kuwongolera. Njira zambiri zopewera zimapondereza bwino ma dendrites kwazaka mazana ambiri, koma mabatire agalimoto yamagetsi amayenera kupirira masauzande ambiri pazaka khumi zogwiritsidwa ntchito. Kukula kwakung'ono kwa dendrite komwe kumawoneka ngati kosavomerezeka pamizere ya 500 kumatha kukhala kovuta pamizere ya 3,000. Kumvetsetsa ndi kupewa{7}njira zochepetsetsa kwa nthawi yayitali zimafuna njira zoyezetsa zotalikirapo.

Kulipira mwachangu kumakhalabe kovuta kwambiri. Mapulogalamu apagalimoto amayang'ana kwambiri nthawi yolipiritsa ya mphindi 15 kapena 5, zomwe zimafuna kachulukidwe wapano wa 10-20 mA/cm² kapena kupitilira apo. Njira zochepa zopewera dendrite zamakono zimakhalabe zogwira mtima pamiyeso yoopsayi. Kupeza zonse zolipiritsa mwachangu komanso moyo wautali wozungulira nthawi imodzi kumayimira cholinga chofufuza malire.

Kuphatikiza ndi zofunika zina za batri kumapangitsa kapangidwe kake. Njira zopondereza ma dendrites zitha kuchepetsa kuchulukira kwa mphamvu, kukulitsa kulepheretsa, kapena kusokoneza-kutentha kocheperako. Mapangidwe a batri akuyenera kukwanira pazifukwa zambiri{3}}zosemphana, zomwe zimapangitsa kupewa dendrite kukhala gawo limodzi lachidule chovuta.

Kukhazikika kwa kuyezetsa ndi kupereka malipoti kungathandizire kupita patsogolo. Magulu ofufuza osiyanasiyana amagwiritsa ntchito matanthauzidwe osiyanasiyana a mapangidwe a dendrite, masinthidwe osiyanasiyana a maselo, ndi njira zosiyanasiyana zopambana. Kukhazikitsa ndondomeko zofananira kungathandize kufanizitsa zotsatira ndi kuzindikira mwachangu njira zomwe zikulonjeza.

Nthawi zopangira dendrite zimasiyana kwambiri ndi momwe zimagwirira ntchito. Pakachulukidwe kakang'ono kakali pano mozungulira 0.5 mA/cm², nucleation yoyamba ya dendrite imatha kutenga maola mazana ambiri. Pakachulukidwe kakang'ono kakupitilira 10 mA/cm², ma dendrites amatha kupanga ndikuyambitsa mabwalo amfupi mkati mwa mphindi. Kutentha, mawonekedwe a electrolyte, ndi mawonekedwe a electrode padziko lonse zimakhudza nthawi izi. Mabatire ambiri ogula amagwira ntchito m'malo omwe mapangidwe a dendrite, ngati achitika, amakula pang'onopang'ono pazigawo zingapo kapena mazana ambiri m'malo mozungulira kamodzi.

Kusintha pang'ono kumatheka pansi pazifukwa zina. Panthawi yotulutsa kapena kupuma, nsonga za dendrite zimatha kusungunukanso mu electrolyte, makamaka ngati sizinagwirizane ndi electrode kudzera mumayendedwe oyendetsa. Kudzichiritsa kumeneku kumafotokoza chifukwa chake ma protocol a pulsed charger amakhala othandiza-nthawi yopuma amalola ma incipient dendrites kusungunuka. Komabe, ma dendrites akapanga zida zazikulu zamakristali kapena kudzipatula pamagetsi ngati lithiamu yakufa, kusinthika kumakhala kosatheka. Kupewa kumakhalabe kothandiza kuposa kukonzanso.

Osati kwenikweni. Mabatire okhazikika a lithiamu-amagwiritsa ntchito ma graphite anode samakhala ndi dendrite m'malo ogwirira ntchito chifukwa lithiamu imalowa graphite m'malo mokutira ngati chitsulo. Mavuto a dendrite amakhudza makamaka ma lithiamu metal anode omwe amagwiritsidwa ntchito mu -mabatire a m'badwo wina. Ngakhale ndi lithiamu metal anode, kamangidwe koyenera ndi kagwiritsidwe ntchito pansi pa kachulukidwe kamakono kangathe kusunga dendrite-ntchito yaulere mpaka kalekale. Kuwongolera kwaubwino ndi kupewa nkhanza ndizofunika kwambiri kuposa kusapeŵeka kwachilengedwe.

Mapangidwe a dendrite amayimira zovuta za electrochemical ndi makina zomwe zimayendetsedwa ndi kachulukidwe kamakono, kutentha, mawonekedwe apakati, ndi zolakwika zakuthupi. Ngakhale poyambilira amaganiziridwa kuti angapewedwe kudzera mu ma electrolyte olimba, ma dendrites amapanga kudzera munjira zoyambira komanso zofalitsa zomwe zimafunikira kulowererapo pagawo lililonse. Njira zingapo-kuphatikiza ma 3D electrode achitectures, artificial SEI layers, electrolyte engineering, ndi pulsed charging protocols-zimasonyeza kulonjezana kokwezera kachulukidwe kameneka. Njira yofikira ku mabatire amphamvu-yamphamvu imadalira kuphatikiza njirazi kwinaku mukusungabe kupangika ndi mtengo wake-mwachangu. Kupita patsogolo kwaposachedwa kwa kachulukidwe ka anthu, kachitidwe ka computational modeling, ndi kamvedwe ka makina akupitiriza kutsogolera chitukuko cha makina a batire a dendrite-wotha kukwanitsa ntchito zolemetsa zamagalimoto ndi grid storage.