Hom thiab ceev faj rau electrolyte lithium roj teeb electrolyte

2022/04/08

Author: Iflowpower –Portable Fais Fab Chaw Muag Khoom

Lub luag haujlwm ntawm electrolyte hauv lithium roj teeb yog qhov zoo dua li qhov tseem ceeb ntawm cov ntshav, thiab yog qhov nruab nrab ntawm cov roj teeb lithium hauv cov roj teeb lithium. Nws tsis muaj hluav taws xob ntws, thiab nws yuav tsis muaj xws li roj teeb, yog li nws qhov tseem ceeb yog qhov tseeb ntawm nws tus kheej. Kev faib tawm ntawm lithium roj teeb electrolyte hom Electrolyte ntawm thawj siv ntawm lithium roj teeb yog muab faib ua kua electrolytes thiab khoom electrolytes, thiab cov kua electrolytes feem ntau hu ua electrolyte, feem ntau nyob rau hauv cylindrical thiab square lithium roj teeb; Cov khoom electrolytes tseem hu ua polymer electrolytes Tam sim no, nws yog tsuas yog siv rau lub hnab mos roj teeb, thiab muaj cov lithium roj teeb tsawg heev los siv cov khoom siv hluav taws xob hauv lub xeev vim cov khoom electrolyte kim dua li cov kua electrolyte, yog li nws tsis tau siv dav hauv ntau lub roj teeb lithium.

1. Kev xaiv cov kua electrolyte electrolyte ntawm qhov kev ua tau zoo ntawm lithium roj teeb yog qhov siab heev, nws yuav tsum muaj kev ua haujlwm ruaj khov, tshwj xeeb tshaj yog nyob rau hauv qhov muaj peev xwm siab dua thiab qhov kub thiab txias, uas tsis yooj yim rau decompose, nrog ion conductivity siab. (> 10-3s / cm), thiab cov khoom siv nyiaj siv ua haujlwm yuav tsum yog inert, tsis tuaj yeem cuam tshuam lawv.

Txij li thaum tus nqi tso tawm muaj peev xwm ntawm lithium ion roj teeb yog siab thiab cov khoom siv anode yog embedded nrog ib tug loj chemically active lithium, cov electrolyte yuav tsum siv cov organic compound tsis muaj dej. Txawm li cas los xij, cov organic teeb meem ion conductivity tsis zoo, yog li soluble conductive ntsev ntxiv rau cov organic hnyav kom nce ion conductivity. Tam sim no, cov roj teeb lithium-ion feem ntau yog siv hauv cov kua electrolytes, thiab cov kuab tshuaj yog cov khoom siv tsis zoo xws li EC, PC, DMC, DEC, thiab feem ntau cov kuab tshuaj sib xyaw, xws li EC / DMC thiab PC / DMC, thiab lwm yam.

Conductive ntsev muaj xws li Liclo4, LiPF6, LIBF6, LIASF6, thiab lwm yam., lawv conductivity yog sequentially LIASF6> LIPF6> Liclo4> LIBF6. Liclo4 feem ntau txwv rau kev sim kev tshawb fawb vim muaj oxidative siab, feem ntau tsuas yog txwv rau kev sim kev tshawb fawb; LIASF6 ion conductivity yog purified thiab stabilized, tab sis muaj tshuaj lom AS, siv txwv; LIBF6 chemistry Thiab cov thermal stability tsis zoo thiab cov conductivity tsis siab, txawm hais tias lub LIPF6 yuav decompose, tab sis muaj ib tug siab ion conductivity, yog li tam sim no lithium-ion roj teeb yog siv LiPF6.

Tam sim no, feem ntau ntawm cov electrolyte siv nyob rau hauv kev lag luam lithium roj teeb siv LiPF6 EC / DMC, uas muaj ion conductivity siab thiab zoo electrochemical stability. 2, cov khoom siv electrolyte siv cov hlau lithium ncaj qha raws li cov khoom siv anode uas muaj peev xwm rov qab tau siab, nws qhov muaj peev xwm theoretical txog li 3862mAh ¡¤ g, yog ob zaug ntawm cov khoom siv graphite, tus nqi kuj tsawg, pom tias yog ib tiam tshiab ntawm lithium. Cov roj teeb ntxim nyiam cov khoom siv anode, tab sis yuav tsim cov lithium. Kev siv cov khoom siv electrolytes li ions tuaj yeem cuam tshuam kev loj hlob ntawm lithium lithium, yog li cov hlau lithium siv los ua cov khoom siv anode.

Tsis tas li ntawd, kev siv cov khoom siv electrolytes tuaj yeem zam qhov tsis zoo ntawm cov kua electrolyte to, thiab lub roj teeb tuaj yeem ua rau nyias nyias (tsuas yog 0.1 hli tuab), lub zog siab ntom ntom, thiab lub ntim me me ntawm lub zog siab. Kev sim ua kom puas tsuaj qhia tau tias cov roj teeb lithium roj teeb muaj kev nyab xeeb heev, ntsia hlau, cua sov (200 ¡ã C), luv luv Circuit Court thiab overcharge (600%), thiab lwm yam.

Lo lus nug, thaum lub roj teeb solid-state tsis muaj lwm yam teeb meem kev nyab xeeb ntxiv rau qhov kub thiab txias, tsis muaj lwm yam teeb meem kev nyab xeeb. Cov khoom siv polymer electrolyte muaj qhov ua tau zoo, kev tsim cov yeeb yaj kiab, kev ruaj ntseg, tus nqi qis, thiab lwm yam, uas tuaj yeem siv los ua qhov zoo thiab tsis zoo electrode spacer uas nws tuaj yeem siv los ua cov electrolyte hloov ions.

Khoom polymer electrolyte feem ntau muab faib ua cov khoom qhuav polymer electrolyte (SPE) thiab gel polymer electrolyte (GPE). SPE khoom polymer electrolyte feem ntau yog ua los ntawm polyethylene oxide (PEO), uas yog cov ion conductivity tsawg, tsuas yog 10-40 cm ntawm 100 ¡ã C. Cov ion conduction hauv SPE yog tsuas yog nyob rau hauv ib cheeb tsam amorphous, thiab Kev hloov pauv kev tsiv teb tsaws yog hloov los ntawm txoj kev ntawm cov saw hlau polymer.

Cov kuab tshuaj organic uas muaj qhov sib txawv me me ntawm cov dielectric siab tas li nyob rau hauv cov khoom siv polymer electrolyte xws li PC tuaj yeem ua kom cov kuab tshuaj ntsev ntau ntxiv, uas yog GPE gel polymer electrolyte, uas muaj qhov zoo heev ntawm chav tsev kub. High ion conductivity, tab sis nyob rau hauv tus txheej txheem ntawm kev siv. Gel polymer lithium ion roj teeb tau ua lag luam.

Lithium roj teeb electrolyte Kev ceev faj 1 Leak los yog lwm yam kev phom sij. Nco ntsoov hnav lub ntsej muag tiv thaiv lub ntsej muag thaum koj hla, thiab koj yuav tsum siv lub ntsej muag qhib ceev txuas. 2 Siv lub khob iav, cov khoom tseem ceeb ntawm cov iav yog silicon oxide, silicon oxide thiab hydrofluoric acid los ua corrosion, volatile gas tetrafluorinated silicon, uas yog lom ua rau raug mob rau tib neeg.

3, cov khoom siv electrolyte thiab cov raj xa dej tuaj yeem siv rau ntawm qhov chaw muaj xws li: stainless hlau, yas PP / PE, tetrafluoroethylene, thiab lwm yam 4, cov khoom no muaj kev phom sij rau tib neeg lub cev, me ntsis stimulating thiab tshuaj loog. Tsis txhob sib cuag ncaj qha thaum siv.

Lithium roj teeb electrolyte tau maj mam hloov cov khoom lag luam tom qab nkag mus rau hauv kev lag luam hauv xyoo 2002. Qhov zoo ntawm cov khoom ntawm lithium-ion roj teeb electrolyte kuj tseem txhim kho thiab txhim kho. Nws txoj kev lag luam kev loj hlob zeem muag tseem loj heev.

Txawm hais tias cov ionic conductivity ntawm cov khoom electrolyte tsis tuaj yeem ua rau cov carbonate kua electrolyte, cov khoom electrolyte tseem yog ib qho ntawm cov kev tshawb fawb tseem ceeb thiab kev loj hlob ntawm cov roj teeb lithium electroly yav tom ntej.

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