Lub tshuab tsim thiab tiv thaiv ntawm dendritic lithium

Daim ntawv:

Txhawm rau nws yooj yim, dendritic lithium txhais tau hais tias cov ntsiab lus ntawm lithium nyob hauv cov graphite tau siab tshaj qhov nws ua tau siab, thiab dhau qhov ntawm lithium ions yuav muab sib txuas nrog cov hluav taws xob tau txiav tawm los ntawm qhov tsis zoo electrode thiab pib tso nyiaj rau saum npoo ntawm cov tsis zoo electrode. Nyob rau hauv tus txheej txheem ntawm them lub roj teeb, sab nraud muab ib qho hluav taws xob rau sab nraud, kom cov lithium ions sab hauv qhov zoo cov khoom siv electrode tuaj yeem tawm mus rau hauv nruab nrab electrolyte. Ib yam li ntawd, cov roj ntsha lithium ions hauv lub ntsuas hluav taws xob yuav txav mus rau carbon txheej nyob rau hauv cov xwm txheej ntawm qhov hluav taws xob sab nraud txawv. Graphite muaj cov txheej txheem tsim, thiab lithium yuav nkag mus rau hauv cov channel los tsim cov roj carbon-lithium txuas nrog cov pa roj carbon, ua rau graphite intercalation compound xws li LiCx (x=1 ~ 6). Kev ntsuas hluav taws xob ntawm qhov tsis zoo ntawm hluav taws xob ntawm cov roj teeb lithium tuaj yeem tawm los ntawm cov qauv hauv qab no:

Hauv cov qauv no, muaj cov lus hais uas yog, yog tias ob leeg lub los xaus, dendritic lithium yuav tsim tawm. Ntawm no yog lub tswvyim uas txhua tus neeg tau paub nrog, graphite intercalation compound. Graphite interlaminar compound (GICs rau luv luv) yog cov sib xyaw crystalline uas siv cov kev siv lub cev lossis tshuaj los txhawm rau ntxig cov tsis muaj carbon ntawm cov graphite txheej thiab ua ke nrog hexagonal network dav hlau ntawm carbon thaum tswj cov txheej txheem graphite.

Nta:

Dendrite lithium feem ntau tso rau ntawm txoj kev sib cuag ntawm tus sib cais thiab cov tsis zoo electrode. Cov tub ntxhais kawm uas tau ua dhau los ntawm roj teeb disassembling yuav tsum pom feem ntau ntawm cov khoom txho ntawm cov khoom sib cais. Yog lawm, nws yog lithium nag lossis daus. Dendrite lithium yog lithium hlau tsim tom qab lithium ions tau txais hluav taws xob, thiab lithium hlau tsis tuaj yeem tsim lithium ions los koom rau lub txim thiab tawm ntawm lub roj teeb, ua rau muaj peev xwm txo roj teeb. Dendrite lithium hlob los ntawm cov nplaim hluav taws xob tsis zoo rau lub tshuab cais tawm. Yog tias lithium hlau tso nyiaj tsis tu ncua, nws yuav mus rau hauv qhov sib cais thiab ua kom luv luv ntawm lub roj teeb, ua rau muaj teeb meem roj teeb.

Cawv lwm yam:

Lub hauv paus tseem ceeb cuam tshuam rau kev tsim cov dendritic lithium yog: qhov ntxhib ntawm qhov tsis zoo electrode saum npoo, lub lithium ion concentration gradient, tam sim no ntom ntom, thiab lwm yam ntxiv, SEI zaj duab xis, hom electrolyte, solute concentration, thiab qhov zoo nyob deb nruab nrab ntawm qhov zoo thiab tsis zoo electrodes tag nrho cuam tshuam qhov dendritic Qhov tsim ntawm lithium muaj qee yam cawv.

1. Sab saum npoo roughness ntawm tsis zoo electrode

Qhov saum npoo ntawm qhov tsis zoo ntawm cov hluav taws xob tsis zoo cuam tshuam qhov tsim ntawm dendritic lithium. Qhov rougher nto, qhov yooj yim dua rau qhov tsim ntawm dendritic lithium. Qhov tsim ntawm dendritic lithium koom nrog electrochemistry, crystallography, thermodynamics, thiab kinetics. David R. Ely Muaj cov ncauj lus kom ntxaws hauv kab lus.

2. Lithium ion concentration gradient thiab xa tawm

Tom qab cov lithium ions raug rho tawm los ntawm cov khoom siv hluav taws xob zoo, lawv dhau los ntawm cov electrolyte thiab lub tshuab cais tawm thiab lees txais cov khoom siv hluav taws xob ntawm qhov tsis zoo electrode. Thaum lub sijhawm them cov txheej txheem, cov lithium ion concentration ntawm qhov zoo electrode maj nce, thiab cov lithium ion concentration ntawm qhov tsis zoo electrode poob vim qhov kev lees txais tas mus li ntawm cov hluav taws xob. Hauv kev daws teeb meem nrog lub siab tam sim no, qhov ntev ntawm ion concentration yuav yog 0. Hauv paus ntawm no, Fleury li al. Tus qauv tsim nrog Chazalviel qhia tau hais tias thaum cov ion concentration txo mus rau 0, cov hluav taws xob tsis zoo yuav tsim cov chaw them nyiaj hauv ib cheeb tsam thiab tsim cov qauv kev dendritic. Kev loj hlob ntawm tus qauv dendritic yog zoo ib yam li ion txav chaw hauv electrolyte.

3. Cov kabmob tam sim no

Hauv tsab xov xwm Dendrite Kev Loj Hlob hauv Lithium / Polymer Systems, tus neeg sau ntseeg tias cov hau kev loj hlob ntawm dendritic lithium yog ze rau qhov ceev tam sim no, raws li qhia hauv cov qauv hauv qab no:

Yog tias qhov ceev tam sim no txo ​​qis, kev loj hlob ntawm dendritic lithium tuaj yeem ncua mus rau qee qhov, raws li muaj nyob hauv daim duab hauv qab no:

Yuav zam li cas:

Kev tsim cov tshuab ntawm dendritic lithium tseem pom tseeb, tab sis muaj ntau yam qauv kev loj hlob ntawm lithium hlau. Raws li kev tsim cov dendritic lithium thiab cov yam ntxwv ntawm lub cev, kev tsim cov dendritic lithium tuaj yeem zam los ntawm cov hauv qab no:

1). Tswj lub flatness ntawm tsis zoo electrode khoom nto.

2) Cov Khoom Muaj). Qhov loj ntawm qhov tsis zoo electrode hais yuav tsum me dua qhov tseem ceeb tshaj plaws xov hluav taws xob.

3). Kev tswj hwm lub wettability ntawm electrodeposits.

4). Txwv txiav lub plating muaj peev xwm qis dua tus nqi tseem ceeb. Ib qho ntxiv, kev them nyiaj ib txwm thiab kev tshem tawm tshuab tuaj yeem txhim kho. Piv txwv li, cov qauv kev qhia mem tes tuaj yeem txiav txim siab.

5). Ntxiv cov electrolyte ntxiv uas ua rau qhov tsis zoo electrode-electrolyte interface

6). Hloov cov kua roj electrolyte nrog lub zog siab gel / solid electrolyte

7). Tsim kom muaj lub zog siab lithium anode nto tiv txheej

Thaum kawg, cia ob lo lus nug nyob tom kawg ntawm tsab xov xwm rau txhua tus los sib tham:

1). Qhov hluav taws xob hluav taws xob ntawm cov roj ntsha lithium ion nyob qhov twg? Ib qho yog theem-hloov huab hwm coj hloov mus tom qab lub electrochemical cov tshuaj tiv thaiv ntawm lithium ions ntawm graphite nto tau nce siab. Qhov thib ob yog tias lithium ions khiav mus rau hauv graphite khaubncaws sab nraud povtseg dhau ntawm cov ciaj ciam ntawm cov kab graphite crystallites, thiab hnov ​​mob hauv graphite.

2) Cov Khoom Muaj). Cov tshuaj tiv thaiv ntawm lithium ions thiab graphite tsim cov roj carbon-lithium tebchaw thiab dendritic lithium tshwm sim ib txhij lossis sib lawv liag?