Iyini imbangela yomthamo webhethri ye-lithium?

ଲେଖକ: ଆଇଫ୍ଲୋପାୱାର - 휴대용 전원소 공급업체

Ngokwemibiko, umthamo wokukhipha ibhethri le-lithium-ion cishe u-31.5% kuphela ekamelweni lokushisa ku -20 ¡ã C. Izinga lokushisa elivamile lebhethri le-lithium-ion phakathi kuka- -20 ~ + 55 ¡ã C.

Kodwa esigabeni se-aerospace, izimoto zikagesi, zidinga ukuthi ibhethri lisebenze kahle kokuthi -40 ¡ã C. Ngakho-ke, kubaluleke kakhulu ukuthuthukisa izakhiwo zokushisa eziphansi zamabhethri e-lithium ion. Ezimweni zokushisa eziphansi, i-viscosity ye-electrolyte iyanda, ngisho nokuqina kancane, okuholela ekuqhubeni okuphansi kwebhethri ye-lithium ion.

Ukuhambisana phakathi kwe-electrolyte kanye ne-electrode engeyinhle kanye ne-diaphragm konakala endaweni yokushisa ephansi. I-electrode eyinegethivu yebhethri ye-lithium ion ngaphansi kwezimo zokushisa eziphansi iye yana kakhulu, futhi i-lithium yensimbi enciphile yasabela nge-electrolyte, futhi ukubekwa komkhiqizo kwabangela ugqinsi oluqinile lwe-electrolyte interface (SEI). Amabhethri e-lithium-ion ngaphansi kwemvelo yokushisa ephansi anciphisa uhlelo lwangaphakathi lokusabalalisa lwento esebenzayo, i-impedance yokudlulisa icala (RCT) inyuke kakhulu.

Umbono wochwepheshe 1: Isixazululo se-Electrolyne sithinta ukusebenza okuphansi kwezinga lokushisa kwamabhethri e-lithium ion, ukubunjwa nokwenziwa kwezinto ezibonakalayo kwe-electrolyte kunomthelela omubi ekusebenzeni okuphansi kwebhethri. Inkinga ebusweni bebhethri iwukuthi: i-viscosity ye-electrolyte izoba nkulu, i-ion conductivity ihamba kancane, okuholela esivinini sokufuduka kwe-electron yesifunda sangaphandle, ngakho ibhethri liye lahlukaniswa kakhulu, futhi umthamo wokushaja nokukhishwa unokwehla okubukhali. Ikakhulukazi lapho ukushaja okunezinga lokushisa eliphansi, ama-ion e-lithium angakha kalula ama-lithium delegranes endaweni ye-electrode engeyinhle, okuholela ekuhlulekeni kwebhethri.

Ukusebenza okuphansi kwezinga lokushisa kwe-electrolyte kuhlobene eduze nosayizi we-electrolyte conductivity ngokwayo, i-ion yokudlulisela ye-conductivity kagesi iyashesha, futhi umthamo owengeziwe ungenziwa emazingeni okushisa aphansi. Uma usawoti we-lithium owengeziwe ku-electrolyte, inani lokufuduka liyanda, likhuphuka izinga lokuhamba. I-conductivity ephezulu kagesi, ukushesha kwe-ion conductivity, i-polarization encane, ukusebenza okungcono kwebhethri ekushiseni okuphansi.

Ngakho-ke, ukuqhutshwa okuphezulu kuyisimo esidingekayo sokufeza ukusebenza kahle kwezinga lokushisa eliphansi lamabhethri e-lithium ion. I-conductivity kagesi ye-electrolyte ihlobene nokubunjwa kwe-electrolyte, futhi i-viscosity ye-solvent iwukuthuthukisa indlela ye-electrolyte conductivity kagesi. I-fluidity ye-solvent inhle ekushiseni okuphansi kwe-solvent yisiqinisekiso sokuthutha kwe-ion, futhi ulwelwesi oluqinile lwe-electrolyte olwakhiwe yi-electrolyte ekushiseni okuphansi futhi luyisihluthulelo sokuthinta i-lithium ion conductance, futhi i-RSEI iwukuvinjelwa okuqinile kwebhethri ye-lithium ion endaweni yokushisa ephansi.

Uchwepheshe 2: Izici zokunambitha zokunciphisa izinga lokushisa eliphansi lamabhethri e-lithium ion amazinga okushisa aphansi, i-Li + diffusion impedance entsha, kodwa hhayi ifilimu ye-SEI. Isakhiwo esinezingqimba sinokubili isiteshi sokusabalalisa i-lithium-ion enohlangothi olulodwa, esinokuzinza kwesakhiwo seshaneli enezinhlangothi ezintathu, futhi siyinto yokuqala yokuhweba yebhethri ye-lithium ion. Izinto zayo ezimele zihlanganisa i-LiCoO2, i-Li (CO1-XNIX) i-O2 ne-Li (Ni, Co, Mn) O2, e.