Kungani umthamo webhethri ye-lithium wehliswa ebusika?

2022/04/02

Umbhali :Iflowpower -Umhlinzeki Wesiteshi Samandla Esiphathekayo

Selokhu angena emakethe, amabhethri e-lithium-ion asetshenziswe kabanzi ezinzuzweni zawo zokuphila isikhathi eside, umthamo othize omkhulu, awukho umphumela wenkumbulo. Izinga lokushisa eliphansi ebhethri ye-lithium ion liphansi, linciphisa kakhulu, ukukhuliswa komjikelezo okungekuhle, kanye nesenzakalo esisobala se-lithium, nokungalingani kwe-lithium e-deinterlaxing. Kodwa-ke, njengoba uhlelo lokusebenza lukhula ngokuqhubekayo, umkhawulo wokushisa okuphansi kokusebenza kwamabhethri e-lithium-ion uyakhula.

 Ngokwemibiko, amandla okukhipha ibhethri ye-lithium ion angaba ngu-31.5% kuphela ekamelweni lokushisa ku -20 ¡ã C. Izinga lokushisa elivamile lebhethri ye-lithium ion liphakathi kuka -20 kuya ku- + 55 ¡ã C.

Kodwa emkhakheni we-aerospace, izimoto zikagesi, ibhethri ingadingeka ukuthi isebenze ngokujwayelekile ku -40 ¡ã C. Ngakho-ke, kubaluleke kakhulu ukuthuthukisa izakhiwo zokushisa eziphansi zamabhethri e-lithium ion. Izinto eziphoqe ibhethri ye-lithium ion ukusebenza kwezinga lokushisa eliphansi endaweni yokushisa ephansi, i-viscosity ye-electrolyte iyanda, ngisho nokuqina kancane, okuholela ekuziphatheni okuphansi kwebhethri ye-lithium ion.

 Ukuhambisana phakathi kwe-electrolyte kanye ne-electrode eyinegethivu kanye ne-diaphragm konakala endaweni yokushisa ephansi. I-electrode eyinegethivu yebhethri ye-lithium ion ngaphansi kwezimo zezinga lokushisa eliphansi yanetha kakhulu, futhi i-lithium yensimbi enciphile yasabela nge-electrolyte, futhi ukubekwa komkhiqizo kuphumela ekukhuleni kokuqina kwe-electrolyte interface (SEI) yesimo esiqinile. Amabhethri e-lithium ion ayancipha ohlelweni lokusabalalisa lwangaphakathi endaweni esebenzayo ngaphansi kwemvelo yezinga lokushisa eliphansi, futhi impedance yokudlulisa ukushaja (RCT) inyuke kakhulu.

 Ingxoxo ngezici ezinqumayo ezithinta ukusebenza kwezinga lokushisa eliphansi lamabhethri e-lithium ion Umbono wochwepheshe 1: I-electrolyte ithinta ukusebenza kwezinga lokushisa eliphansi lamabhethri e-lithium ion, ukwakheka kanye nezakhiwo ze-electrolyte kunomthelela obalulekile ekushiseni okuphansi kwebhethri. Inkinga ekushiseni okuphansi kwebhethri yilezi: i-viscosity ye-electrolyte izoba nkulu, ijubane le-ion conduction lihamba kancane, okuholela ejubaneni lokufuduka kwe-electron yesekethe yangaphandle, ngakho-ke ibhethri liye lahlukaniswa kakhulu, futhi ukushaja nokukhipha amandla ukwehla okubukhali. Ikakhulukazi lapho ishaja izinga lokushisa eliphansi, ama-ion e-lithium angakha kalula i-lithium delegra endaweni ye-electrode engeyinhle, okuholela ekuhlulekeni kwebhethri.

 Ukushisa okuphansi kokusebenza kwe-electrolyte kuhlobene eduze nobukhulu be-electrolyte ngokwayo, futhi i-ion yokudlulisa ye-conductivity kagesi iyashesha, futhi umthamo owengeziwe ungaboniswa emazingeni okushisa aphansi. Uma usawoti we-lithium owengeziwe ku-electrolyte, inani lokufuduka liyanda, i-conductivity iyanda. Isivinini se-conductivity 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-electrolyte conductivity kagesi ihlobene nokubunjwa kokuhlanganiswa 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 ku-electrolyte lokushisa eliphansi futhi luyisihluthulelo sokuthinta i-lithium ion conductance, futhi i-RSEI iyisivikelo esiyinhloko. yebhethri ye-lithium ion endaweni yokushisa ephansi.

 Uchwepheshe 2: Ukunciphisa isici esiyinhloko ekusebenzeni okuphansi kwezinga lokushisa kwamabhethri e-lithium ion ukukhuphuka okubukhali kwe-LI + impedance yokusabalalisa emazingeni okushisa aphansi, kodwa hhayi ifilimu ye-SEI.&nb.

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