Yintoni unobangela womthamo webhetri ye-lithium?

ଲେଖକ: ଆଇଫ୍ଲୋପାୱାର - Furnizuesi portativ i stacionit të energjisë elektrike

Ngokweengxelo, umthamo wokukhutshwa kwebhetri ye-lithium-ion kuphela malunga ne-31.5% kwiqondo lokushisa lokushisa kwi -20 ¡ã C. Iqondo lobushushu elisebenzayo lebhetri yelithium-ion phakathi kwe -20 ~ + 55 ¡ã C.

Kodwa kudidi lwe-aerospace, izithuthi zombane, zifuna ukuba ibhetri isebenze ngokufanelekileyo kwi -40 ¡ã C. Ngoko ke, kubaluleke kakhulu ukuphucula iimpawu zokushisa eziphantsi kweebhetri ze-lithium ion. Kwiindawo zokushisa eziphantsi, i-viscosity ye-electrolyte iyanda, kwaye iqiniswe ngokuyinxenye, okukhokelela ekuqhubeni okuphantsi kwebhetri ye-lithium ion.

Ukuhambelana phakathi kwe-electrolyte kunye ne-electrode engalunganga kunye ne-diaphragm iyancipha kwindawo yokushisa ephantsi. I-electrode engalunganga yebhetri ye-lithium ion phantsi kweendawo eziphantsi zobushushu eziphantsi zanyanzeliswa kakhulu, kwaye i-lithium yensimbi encitshisiweyo yaphendulwa nge-electrolyte, kunye nokubekwa kwemveliso kubangelwa ubungakanani obuqinileyo be-electrolyte (SEI) ubukhulu. Iibhetri ze-Lithium-ion phantsi kwemeko yokushisa ephantsi yokunciphisa inkqubo yokusabalalisa yangaphakathi yento esebenzayo, i-impedance transfer transfer (RCT) yanda kakhulu.

Umbono wengcali 1: Isisombululo se-Electrolyne sichaphazela ukusebenza kweqondo lokushisa eliphantsi kweebhetri ze-lithium ion, ukubunjwa kunye neempawu ezibonakalayo ze-electrolyte zinefuthe elibi kwibhetri ephantsi kweqondo lokushisa. Ingxaki kumphezulu webhetri kukuba: i-viscosity ye-electrolyte iya kuba nkulu, i-ion conductivity icotha, okukhokelela kwisantya sokufuduka kwe-electron yesekethe yangaphandle, ngoko ibhetri iye yahlukana kakhulu, kwaye umthamo kunye nokukhupha umthamo unokuncipha okubukhali. Ngokukodwa xa ukutshaja okuphantsi kobushushu, i-lithium ion inokwenza lula i-lithium delegranes kumphezulu we-electrode engalunganga, okukhokelela ekungaphumeleli kwebhetri.

Ukusebenza kweqondo lokushisa eliphantsi kwe-electrolyte kuhambelana ngokusondeleyo nobukhulu be-electrolyte conductivity ngokwayo, i-ion yokuhambisa i-conductivity yombane iyakhawuleza, kwaye umthamo ongaphezulu unokuqhutyelwa kumaqondo aphantsi. I-lithium ityuwa eninzi kwi-electrolyte, ngakumbi inani lokufuduka, iphezulu i-conductivity. I-conductivity ephezulu yombane, ngokukhawuleza i-ion conductivity, i-polarization encinci, ingcono ukusebenza kwebhetri kwiqondo lokushisa eliphantsi.

Ke ngoko, ukuhanjiswa okuphezulu yimeko eyimfuneko yokufezekisa ukusebenza kakuhle kobushushu obuphantsi beebhetri ze-lithium ion. I-conductivity yombane ye-electrolyte ihambelana nokubunjwa kwe-electrolyte, kunye ne-viscosity ye-solvent kukuphucula indlela yombane we-electrolyte conductivity. I-fluidity ye-solvent ilungile kwiqondo lokushisa eliphantsi le-solvent isiqinisekiso sothutho lwe-ion, kwaye i-membrane ye-electrolyte eqinile eyenziwe yi-electrolyte kwiqondo eliphantsi lobushushu nayo iyisitshixo sokuchaphazela i-lithium ion conductance, kwaye i-RSEI i-impedance eqinile yebhethri ye-lithium ion kwindawo yokushisa ephantsi.

Ingcaphephe yesi-2: Izinto zokungcamla ukunciphisa ukusebenza kobushushu obuphantsi beebhetri ze-lithium ion ngamaqondo obushushu aphantsi, i-Li + entsha ye-diffusion impedance, kodwa hayi ifilimu ye-SEI. Ulwakhiwo oluthe tyaba lune-channel ye-lithium-ion diffusion ene-dimensional one-dimensional, ene-stable-dimensional channel structure stability, kwaye yinto yokuqala yorhwebo ye-lithium ion ibhetri ye-positive material. Izinto zayo ezimele ziquka i-LiCoO2, i-Li (CO1-XNIX) i-O2 kunye ne-Li (Ni, i-Co, i-Mn) i-O2, e.