Dendrite lithium tsuas yog txhais tau hais tias thaum cov lithium embedded nyob rau hauv graphite tshaj nws kam rau ua, cov lithium ions ntau dhau yuav ua ke nrog electrons los ntawm qhov tsis zoo electrode thiab pib tso rau saum npoo ntawm qhov tsis zoo electrode. Nyob rau hauv tus txheej txheem ntawm recharge lub roj teeb, ib tug voltage los ntawm lub sab nraud lub ntiaj teb no thiab lub internal lithium ion anode cov ntaub ntawv kom tawm mus rau hauv lub electrolyte nruab nrab, electrolyte ntawm lithium ion kuj nyob rau hauv cov xwm txheej ntawm qhov voltage sib txawv ntawm lub ntiaj teb sab nraud mus rau cov pa roj carbon txheej. , vim hais tias cov graphite yog txheej txheej, lithium lithium yuav nkag mus rau hauv cov channel nrog cov pa roj carbon monoxide, LiCx (x = 1 ~ 6) graphite interlaminar compounds yog tsim. Cov tshuaj tiv thaiv electrochemical ntawm anode ntawm lithium roj teeb tuaj yeem qhia tau raws li hauv qab no:

Hauv cov qauv no, koj muaj ib qho parameter, daim duab, thiab yog tias koj ntxiv ob qho tib si hauv daim duab, koj tau txais dendrite lithium. Muaj ib lub tswv yim ntawm no uas txhua leej txhua tus paub txog, graphite interlaminar tebchaw. Graphite interlamellar compounds (GICs luv luv) yog crystalline compounds uas tsis yog-carbonaceous reactants tau muab tso rau hauv graphite txheej los ntawm lub cev los yog tshuaj txhais tau tias ua ke nrog hexagonal network dav hlau ntawm carbon thaum tswj graphite lamellar qauv.

nta:

Dendrite lithium feem ntau tso rau ntawm qhov chaw sib cuag ntawm lub diaphragm thiab cov ncej tsis zoo. Cov tub ntxhais kawm uas muaj kev paub dhau los ntawm kev rhuav tshem cov roj teeb yuav tsum feem ntau pom ib txheej ntawm cov khoom grey ntawm lub diaphragm. Yog, nws yog lithium. Dendrite lithium yog lithium hlau tsim tom qab lithium ion tau txais electron. Lithium hlau tsis tuaj yeem tsim lithium ion los koom rau hauv kev them nqi thiab tawm cov tshuaj tiv thaiv ntawm cov roj teeb, ua rau txo cov roj teeb muaj peev xwm. Dendrite lithium loj hlob los ntawm qhov chaw ntawm qhov tsis zoo electrode mus rau diaphragm. Yog tias lithium hlau tsis tu ncua, nws yuav kawg Pierce lub diaphragm thiab ua rau lub roj teeb luv luv, ua rau muaj teeb meem kev nyab xeeb ntawm roj teeb.

Cawv lwm yam:

Lub ntsiab yam tseem ceeb cuam tshuam rau kev tsim ntawm dendrite lithium yog roughness ntawm anode nto, qhov concentration gradient ntawm lithium ion thiab qhov ceev tam sim no, thiab lwm yam. Tsis tas li ntawd, SEI zaj duab xis, hom electrolyte, solute concentration thiab qhov kev ncua deb ntawm qhov zoo. thiab cov electrodes tsis zoo tag nrho muaj qee yam cuam tshuam rau kev tsim cov dendrite lithium.

1. Tsis zoo nto roughness

Qhov roughness ntawm qhov tsis zoo electrode nto cuam tshuam rau kev tsim ntawm dendrite lithium, thiab qhov rougher ntawm qhov chaw, qhov ntau conducive nws yog tsim los ntawm dendrite lithium. Kev tsim ntawm dendrite lithium suav nrog plaub yam tseem ceeb, suav nrog electrochemistry, crystology, thermodynamics thiab kinetics, uas tau piav qhia meej hauv kab lus ntawm David R. Ely.

2. Gradient thiab faib ntawm lithium ion concentration

Tom qab khiav tawm ntawm cov khoom zoo, cov lithium ions dhau los ntawm electrolyte thiab membrane kom tau txais cov hluav taws xob ntawm qhov tsis zoo electrode. Thaum lub sij hawm them tus txheej txheem, qhov concentration ntawm lithium ions nyob rau hauv qhov zoo electrode maj mam nce, thaum lub concentration ntawm lithium ions nyob rau hauv qhov tsis zoo electrode txo vim qhov tsis tu ncua ntawm electrons. Nyob rau hauv ib tug dilute tov nrog high tam sim no ceev, lub ion concentration yuav zero. Tus qauv tsim los ntawm Chazalviel thiab Chazalviel qhia tau hais tias thaum lub ion concentration txo mus rau 0, cov electrode tsis zoo yuav tsim ib qho chaw hauv zos thiab tsim cov qauv dendrite. Qhov kev loj hlob ntawm cov qauv dendrite yog tib yam li cov ion tsiv teb tsaws ntawm cov electrolyte.

3. Tam sim no ceev

Nyob rau hauv tsab xov xwm Dendrite Kev Loj Hlob hauv Lithium/Polymer Systems, tus sau ntseeg tias qhov kev loj hlob ntawm qhov kawg ntawm Dendrite Lithium yog ze ze rau qhov ceev tam sim no, raws li qhia hauv kab zauv hauv qab no:

Daim duab

Yog tias qhov ceev tam sim no raug txo, kev loj hlob ntawm dendrite lithium tuaj yeem ncua mus rau qee qhov, raws li qhia hauv daim duab hauv qab no:

Daim duab

Yuav zam li cas:

Cov txheej txheem tsim ntawm dendrite lithium tseem yog qhov tseeb, tab sis muaj ntau yam kev loj hlob ntawm lithium hlau. Raws li kev tsim thiab kev cuam tshuam ntawm dendrite lithium, kev tsim ntawm dendrite lithium tuaj yeem zam los ntawm cov hauv qab no:

1. Tswj qhov flatness ntawm cov khoom siv anode.

2. Qhov luaj li cas ntawm qhov tsis zoo yuav tsum yog me dua li qhov tseem ceeb ntawm lub vojvoog thermodynamic.

3. Tswj lub wettability ntawm electrodeposition.

4. Txwv qhov muaj peev xwm electroplating hauv qab tus nqi tseem ceeb. Tsis tas li ntawd, cov txheej txheem kev them nqi thiab kev tso tawm ib txwm tuaj yeem txhim kho, piv txwv li, hom mem tes tuaj yeem txiav txim siab.

5. Ntxiv electrolyte additives uas stabilize qhov tsis zoo-electrolyte interface

6. Hloov cov kua electrolyte nrog lub zog siab gel / khoom electrolyte

7. Tsim kom muaj txheej txheej tiv thaiv ntawm lub zog siab lithium anode

Thaum kawg, ob lo lus nug tseem tshuav rau kev sib tham hauv qhov kawg ntawm kab lus:

1. Cov tshuaj tiv thaiv electrochemical ntawm lithium ions nyob qhov twg? Ib qho yog tias lithium ions nyob rau saum npoo ntawm graphite electrochemical cov tshuaj tiv thaiv tom qab cov khoom loj hloov mus, kom ncav cuag lub xeev saturation. Thib ob, lithium ions tsiv mus rau hauv graphite txheej los ntawm cov ciam teb ntawm graphite microcrystals thiab ua rau hauv graphite.

2. Puas yog lithium ions hnov ​​​​mob nrog graphite los ua lithium carbon compound thiab dendrite lithium synchronously los yog sequentially?

Zoo siab txais tos los tham, tawm lus ~