Dab tsi yog qhov ua rau ntawm lithium roj teeb muaj peev xwm?

著者：Iflowpower – Olupese Ibusọ Agbara to ṣee gbe

Raws li cov lus ceeb toom, lub peev xwm tso tawm ntawm lithium-ion roj teeb tsuas yog kwv yees li 31.5% ntawm chav tsev kub ntawm -20 º C. Ib txwm lithium-ion roj teeb ua haujlwm kub ntawm -20 ~ + 55 ¡ã C.

Tab sis nyob rau hauv qeb ntawm aerospace, hluav taws xob tsheb, yuav tsum tau lub roj teeb ua hauj lwm kom zoo ntawm -40 º C. Yog li ntawd, nws yog ib qho tseem ceeb heev los txhim kho qhov kub thiab txias ntawm lithium ion roj teeb. Nyob rau hauv qhov kub thiab txias ib puag ncig, viscosity ntawm cov electrolyte nce, txawm tias ib nrab solidified, uas ua rau ib tug tsawg-conductivity ntawm lithium ion roj teeb.

Cov kev sib raug zoo ntawm cov electrolyte thiab cov electrode tsis zoo thiab cov diaphragm yog deteriorated nyob rau hauv ib qho chaw kub kub. Qhov tsis zoo electrode ntawm lithium ion roj teeb nyob rau hauv qhov kub tsis tshua muaj ib puag ncig tau hnyav heev, thiab cov nag lossis daus hlau lithium tau hnov ​​​​mob nrog cov khoom siv electrolyte, thiab cov khoom tso tawm ua rau cov khoom electrolyte interface (SEI) tuab. Cov roj teeb lithium-ion nyob rau hauv qhov kub thiab txias ib puag ncig txo qhov kev sib txuas sab hauv ntawm cov khoom nquag, cov nqi hloov pauv impedance (RCT) tau nce ntau.

Cov kws tshaj lij txoj kev xav 1: Cov tshuaj electrolyne cuam tshuam rau qhov kub thiab txias ntawm lithium ion roj teeb, qhov muaj pes tsawg leeg thiab cov khoom siv hluav taws xob muaj qhov cuam tshuam tsis zoo rau cov roj teeb uas tsis muaj qhov kub thiab txias. Qhov teeb meem nyob rau saum npoo ntawm lub roj teeb yog: lub viscosity ntawm cov electrolyte yuav loj, ion conductivity qeeb, ua rau lub electron tsiv teb tsaws ceev ntawm sab nraud Circuit Court, yog li ntawd lub roj teeb muaj polarized heev, thiab lub peev xwm thiab paug muaj ib tug ntse txo. Tshwj xeeb tshaj yog thaum them nyiaj qis, lithium ions tuaj yeem yooj yim tsim lithium delegranes ntawm qhov chaw ntawm qhov tsis zoo electrode, ua rau lub roj teeb tsis ua haujlwm.

Qhov kub tsis tshua muaj kev ua tau zoo ntawm cov electrolyte yog ze ze rau qhov loj ntawm cov electrolyte tus kheej conductivity, kev sib kis ion ntawm cov hluav taws xob conductivity yog ceev, thiab muaj peev xwm ntau dua ntawm qhov kub thiab txias. Qhov ntau cov lithium ntsev nyob rau hauv cov electrolyte, qhov ntau ntawm cov migrations, cov conductivity ntau dua. Cov hluav taws xob hluav taws xob siab, qhov ceev ntawm ion conductivity, qhov me me ntawm polarization, qhov ua tau zoo ntawm lub roj teeb ntawm qhov kub thiab txias.

Yog li ntawd, kev siv hluav taws xob ntau dua yog qhov tsim nyog rau kev ua tiav qhov ua tau zoo ntawm qhov kub thiab txias ntawm lithium ion roj teeb. Cov hluav taws xob conductivity ntawm cov electrolyte muaj feem xyuam rau cov muaj pes tsawg leeg ntawm cov electrolyte, thiab viscosity ntawm cov kuab tshuaj yog los txhim kho txoj kev ntawm electrolyte hluav taws xob conductivity. Lub fluidity ntawm cov kuab tshuaj yog qhov zoo ntawm qhov kub thiab txias ntawm cov kuab tshuaj yog qhov lav ntawm ion thauj, thiab cov khoom electrolyte membrane tsim los ntawm cov electrolyte nyob rau hauv qhov kub thiab txias kuj yog ib qho tseem ceeb rau kev cuam tshuam lithium ion conductance, thiab RSEI yog ib tug nruj impedance ntawm ib tug lithium ion roj teeb nyob rau hauv ib tug kub qhov chaw.

Cov kws tshaj lij 2: Cov yam ntxwv saj kom txo qis kev ua haujlwm ntawm lithium ion roj teeb yog qhov kub thiab txias, tshiab Li + diffusion impedance, tab sis tsis yog SEI zaj duab xis. Cov txheej txheem txheej txheem muaj ob qho tib si ib-dimensional lithium-ion diffusion channel, uas muaj peb-dimensional channel qauv ruaj khov, thiab yog thawj cov khoom lag luam lithium ion roj teeb zoo. Nws cov khoom sawv cev suav nrog LiCoO2, Li (CO1-XNIX) O2 thiab Li (Ni, Co, Mn) O2, e.