Isi mmalite: onye ndu ume ọhụrụ, site
Abstract: ugbu a, lithium salts na azụmahịa lithium-ion batrị electrolyte bụ tumadi LiPF6 na LiPF6 enyela electrolyte magburu onwe electrochemical arụmọrụ, ma LiPF6 nwere adịghị mma thermal na kemịkalụ kwụsie ike, na-enwe mmetụta miri emi na mmiri.
Ugbu a, lithium salts na azụmahịa lithium-ion batrị electrolyte bụ tumadi LiPF6 na LiPF6 enyela electrolyte magburu onwe electrochemical arụmọrụ.Agbanyeghị, LiPF6 nwere nkwụsi ike ọkụ na kemịkalụ adịghị mma, ọ na-enwekwa mmetụta maka mmiri.N'okpuru ọrụ nke obere H2O, a ga-emebi ihe acid dị ka HF, mgbe ahụ, ihe ndị dị mma ga-emebi emebi, a ga-agbazekwa ihe ndị na-emepụta ihe na-agbanwe agbanwe, na elu nke electrode na-adịghị mma ga-akwaga ibibi ihe nkiri SEI. , Nsonaazụ na-egosi na ihe nkiri SEI na-aga n'ihu na-eto eto, nke na-eduga na nkwụsị na-aga n'ihu nke ikike nke batrị lithium-ion.
Iji merie nsogbu ndị a, ndị mmadụ nwere olile anya na lithium salts nke imide nwere H2O kwụsiri ike na nkwụsi ike ka mma na kemịkalụ, dị ka lithium salts dị ka LiTFSI, lifsi na liftfsi, na-ejedebe site na ọnụ ahịa ihe na anions nke lithium salts. dị ka LiTFSI enweghị ike idozi maka corrosion nke Al foil, wdg, LiTFSI lithium nnu etinyebeghị ya na omume.N'oge na-adịbeghị anya, VARVARA sharova nke ụlọ nyocha German HIU achọpụtala ụzọ ọhụrụ maka ntinye nke imide lithium salts dị ka ihe mgbakwunye electrolyte.
The ala ike nke graphite ọjọọ electrode na Li-ion batrị ga-eduga decomposition nke electrolyte n'elu ya, akpụ passivation oyi akwa, nke a na-akpọ SEI film.Ihe nkiri SEI nwere ike igbochi electrolyte site na ire ere na elu na-adịghị mma, yabụ nkwụsi ike nke ihe nkiri SEI nwere mmetụta dị oke mkpa na nkwụsi ike okirikiri nke batrị lithium-ion.Ọ bụ ezie na lithium salts dị ka LiTFSI enweghị ike iji dị ka solute nke azụmahịa electrolyte ruo nwa oge, a na-eji ya dị ka ihe mgbakwunye na rụpụtawo ezigbo ezi arụpụta.Nnwale VARVARA sharova chọpụtara na ịgbakwụnye 2wt% LiTFSI na electrolyte nwere ike melite arụmọrụ okirikiri nke batrị lifepo4/ graphite nke ọma: okirikiri 600 na 20 ℃ na mbelata ikike erughị 2%.N'ime otu njikwa, a na-agbakwunye electrolyte nwere mgbakwunye 2wt% VC.N'okpuru otu ọnọdụ ahụ, ọdịda nke ike batrị ruru ihe dịka 20%.
Iji nyochaa mmetụta nke mgbakwunye dị iche iche na arụmọrụ nke batrị lithium-ion, otu oghere lp30 (EC: DMC = 1: 1) na-enweghị mgbakwunye na otu nnwale na VC, LiTFSI, lifsi na liftfsi kwadoro site na varvarvara sharova. n'otu n'otu.A na-enyocha arụmọrụ nke electrolytes ndị a site na bọtịnụ ọkara cell na cell zuru ezu.
Ọnụ ọgụgụ dị n'elu na-egosi akụkụ voltammetric nke electrolytes nke otu njikwa oghere na otu nnwale.N'oge usoro mbelata, anyị chọpụtara na ọnụ ọgụgụ dị ugbu a doro anya pụtara na electrolyte nke otu oghere na ihe dịka 0.65v, kwekọrọ na mbelata ire ere nke EC ihe mgbaze.Ọnụ ọgụgụ kachasị elu nke ugbu a nke otu nnwale na mgbakwunye VC gbanwere na ikike dị elu, nke bụ isi n'ihi na volta decomposition nke ihe mgbakwunye VC dị elu karịa nke EC, Ya mere, nbibi ahụ mere na mbụ, nke na-echebe EC.Agbanyeghị, akụkụ voltammetric nke electrolyte agbakwunyere na mgbakwunye LiTFSI, lifsi na littfsi adịchaghị iche na nke otu oghere, nke gosiri na mgbakwunye imide enweghị ike ibelata ire ere nke ihe mgbaze EC.
Ọnụ ọgụgụ dị n'elu na-egosi arụmọrụ electrochemical nke graphite anode na electrolytes dị iche iche.Site na arụmọrụ nke ụgwọ mbụ na mwepụta, arụmọrụ coulomb nke otu oghere bụ 93.3%, arụmọrụ mbụ nke electrolytes na LiTFSI, lifsi na liftfsi bụ 93.3%, 93.6% na 93.8%, otu n'otu.Otú ọ dị, mbụ arụmọrụ nke electrolytes na VC mgbakwunye bụ naanị 91,5%, nke bụ tumadi n'ihi na n'oge mbụ lithium intercalation nke graphite, VC decomposes n'elu graphite anode na-erepịakwa ọzọ Li.
Ihe mejupụtara nke ihe nkiri SEI ga-enwe mmetụta dị ukwuu na ionic conductivity, wee metụta ọnụego arụmọrụ nke batrị Li ion.Na ule arụmọrụ ọnụego, a na-achọpụta na electrolyte nwere lifsi na liftfsi additives nwere ike dị ntakịrị ala karịa ndị ọzọ electrolytes na-agbapụta dị elu ugbu a.N'ime ule okirikiri C / 2, arụmọrụ okirikiri nke ndị electrolytes niile nwere ihe mgbakwunye imide kwụsiri ike, ebe ikike nke electrolytes nwere mgbakwunye VC na-ebelata.
Iji nyochaa nkwụsi ike nke electrolyte na ogologo oge okirikiri nke lithium-ion batrị, VARVARA sharova kwadokwara LiFePO4 / graphite zuru cell na bọtịnụ cell, ma nyochaa ọrụ okirikiri nke electrolyte na mgbakwunye dị iche iche na 20 ℃ na 40 ℃.E gosipụtara nsonaazụ nyocha na tebụl dị n'okpuru.Enwere ike ịhụ site na tebụl na arụmọrụ nke electrolyte na mgbakwunye LiTFSI dị elu karịa nke ahụ na mgbakwunye VC maka oge mbụ, na ịrụ ọrụ ịgba ígwè na 20 ℃ bụ ọbụna karịa.Ọnụego njide ikike nke electrolyte nwere mgbakwunye LiTFSI bụ 98.1% mgbe okirikiri 600 gachara, ebe njide ikike nke electrolyte nwere mgbakwunye VC bụ naanị 79.6%.Otú ọ dị, uru a na-apụ n'anya mgbe a na-agbagharị electrolyte na 40 ℃, na ndị electrolytes niile nwere arụmọrụ ịgba ígwè.
Site na nyocha a dị n'elu, ọ naghị esiri ike ịhụ na arụmọrụ okirikiri nke batrị lithium-ion nwere ike ime ka ọ dịkwuo mma mgbe a na-eji nnu lithium imide eme ihe dị ka ihe mgbakwunye electrolyte.Iji mụọ usoro ihe mgbakwunye dị ka LiTFSI na batrị lithium-ion, VARVARA sharova nyochara ihe mejupụtara ihe nkiri SEI nke emere n'elu graphite anode na electrolytes dị iche iche nke XPS.Ọnụ ọgụgụ na-esonụ na-egosi nsonaazụ nyocha XPS nke ihe nkiri SEI nke kpụrụ n'elu graphite anode mgbe nke mbụ na nke 50th cycles.Enwere ike ịhụ na ọdịnaya LIF dị na ihe nkiri SEI nke e guzobere na electrolyte nwere mgbakwunye LiTFSI dị elu karịa nke ahụ na electrolyte nwere mgbakwunye VC.Ntụle ọnụọgụ ọzọ nke ihe mejupụtara ihe nkiri SEI na-egosi na usoro nke ọdịnaya LIF na ihe nkiri SEI bụ lifsi> liftfsi> LiTFSI> VC> otu oghere mgbe okirikiri nke mbụ gasịrị, mana ihe nkiri SEI anaghị agbanwe agbanwe mgbe ụgwọ mbụ gasịrị.Mgbe okirikiri 50 gasịrị, ọdịnaya LIF nke ihe nkiri SEI na lifsi na liftfsi electrolyte belatara site na 12% na 43% n'otu n'otu, ebe ọdịnaya LIF nke electrolyte agbakwunyere na LiTFSI mụbara site na 9%.
N'ozuzu, anyị na-eche na usoro nke akpụkpọ ahụ SEI na-ekewa n'ime abụọ n'ígwé: n'ime inorganic oyi akwa na elu organic oyi akwa.The inorganic oyi akwa bụ tumadi esịnede LIF, Li2CO3 na ndị ọzọ inorganic components, nke nwere mma electrochemical arụmọrụ na elu ionic conductivity.Mpụta organic oyi akwa bụ tumadi esịnede porous electrolyte decomposition na polymerization ngwaahịa, dị ka roco2li, PEO na na, nke na-enweghị ike nchebe maka electrolyte, Ya mere, anyị na-atụ anya na SEI akpụkpọ ahụ nwere ihe inorganic components.Ihe mgbakwunye Imide nwere ike iweta ihe ndị ọzọ inorganic LIF na akpụkpọ ahụ SEI, nke na-eme ka usoro nke akpụkpọ ahụ SEI kwụsie ike, nwere ike igbochi ire ere electrolyte na usoro okirikiri batrị, belata oriri Li, ma melite arụmọrụ okirikiri nke batrị ahụ.
Dị ka ihe mgbakwunye electrolyte, karịsịa ihe mgbakwunye LiTFSI, imide lithium salts nwere ike imeziwanye arụmọrụ okirikiri nke batrị.Nke a bụ tumadi n'ihi na ihe nkiri SEI kpụrụ n'elu graphite anode nwere ihe LIF, thinner na ọzọ kwụsiri ike SEI film, nke na-ebelata decomposition nke electrolyte na-ebelata interface-eguzogide.Agbanyeghị, site na data nnwale dị ugbu a, mgbakwunye LiTFSI dabara adaba maka ojiji n'ime ụlọ okpomọkụ.Na 40 ℃, mgbakwunye LiTFSI enweghị uru doro anya karịa mgbakwunye VC.
Oge nzipu: Eprel-15-2021