Source: alakaʻi ikehu hou, na
Abstract: i kēia manawa, ʻo nā paʻakai lithium i loko o ka pānaʻi lithium-ion pākēneka electrolyte ʻo ia ka LiPF6 a me LiPF6 i hāʻawi i ka electrolyte maikaʻi loa i ka hana electrochemical, akā ʻo LiPF6 ʻilihune ka wela a me ka paʻa kemika, a ua maʻalahi loa i ka wai.
I kēia manawa, ʻo nā paʻakai lithium i loko o nā pā uila lithium-ion pāʻoihana ʻo LiPF6 a me LiPF6 i hāʻawi i ka electrolyte hana electrochemical maikaʻi loa.Eia nō naʻe, ʻaʻohe paʻa wela a me nā kemika liʻiliʻi o LiPF6, a paʻakikī loa i ka wai.Ma lalo o ka hana a kahi liʻiliʻi o ka H2O, e hoʻoheheʻe ʻia nā mea waikawa e like me ka HF, a laila e ʻino ʻia ka mea maikaʻi, a e hoʻoheheʻe ʻia nā mea metala hoʻololi, a e neʻe ka ʻili o ka electrode maikaʻi ʻole e luku i ke kiʻi ʻoniʻoni SEI. , Hōʻike nā hopena i ka uluʻana o ke kiʻi SEI, kahi e alakaʻi ai i ka emi mau o ka mana o nā pahu lithium-ion.
I mea e lanakila ai i kēia mau pilikia, ua manaʻolana ka poʻe i ka paʻakai lithium o ka imide me ka H2O paʻa a ʻoi aku ka maikaʻi o ka wela a me ka paʻa kemika, e like me nā paʻakai lithium e like me LiTFSI, lifsi a me liftfsi, ua kaupalena ʻia e nā kumu kumu kūʻai a me nā anion o nā paʻakai lithium. e like me LiTFSI ʻaʻole hiki ke hoʻonā ʻia no ka corrosion o Al foil, etc., ʻaʻole i hoʻohana ʻia ka paʻakai lithium LiTFSI i ka hana.I kēia mau lā, ua loaʻa iā VARVARA sharova o Kelemania HIU kahi ala hou no ka hoʻohana ʻana i nā paʻakai lithium imide e like me nā mea hoʻohui electrolyte.
ʻO ka haʻahaʻa haʻahaʻa o ka graphite maikaʻi ʻole electrode i ka pā Li-ion e alakaʻi i ka decomposition o electrolyte ma luna o kona ʻili, e hana ana i ka papa passivation, i kapa ʻia ʻo SEI film.Hiki i ke kiʻi ʻoniʻoni SEI ke pale i ka electrolyte mai ka decomposition ma ka ʻili maikaʻi ʻole, no laila ke koʻikoʻi ka paʻa o ke kiʻi ʻoniʻoni SEI i ka paʻa o ka pōʻai o nā pā lithium-ion.ʻOiai ʻaʻole hiki ke hoʻohana ʻia nā paʻakai lithium e like me LiTFSI e like me ka solute o ka electrolyte pāʻoihana no kekahi manawa, ua hoʻohana ʻia e like me nā mea hoʻohui a loaʻa nā hopena maikaʻi loa.Ua ʻike ʻo VAVARARA sharova hoʻokolohua ʻo ka hoʻohui ʻana i ka 2wt% LiTFSI i loko o ka electrolyte hiki ke hoʻomaikaʻi maikaʻi i ka hana pōʻai o lifepo4/ graphite pākaukau: 600 cycles ma 20 ℃ a ʻo ka emi ʻana o ka hiki ke emi ma mua o 2%.I ka hui hoʻomalu, hoʻohui ʻia ka electrolyte me 2wt% VC additive.Ma lalo o nā kūlana like, hiki i ka emi ʻana o ka mana o ka pākaukau ma kahi o 20%.
I mea e hōʻoia ai i ka hopena o nā mea hoʻohui like ʻole i ka hana o nā pā lithium-ion, ua hoʻomākaukau ʻia ka hui blank lp30 (EC: DMC = 1: 1) me ka ʻole o nā mea hoʻohui a me ka hui hoʻokolohua me VC, LiTFSI, lifsi a me liftfsi i hoʻomākaukau ʻia e varvarvara sharova pakahi.Ua loiloi ʻia ka hana o kēia mau electrolytes e ke pihi hapalua cell a me ka cell cell piha.
Hōʻike ka kiʻi ma luna i nā kaha voltammetric o nā electrolytes o ka pūʻulu mana blank a me ka pūʻulu hoʻokolohua.I loko o ke kaʻina hana ho'ēmi, ua ʻike mākou ua ʻike ʻia kahi kiʻekiʻe o kēia manawa i ka electrolyte o ka pūʻulu blank ma kahi o 0.65v, e pili ana i ka hoʻohaʻahaʻa decomposition o EC solvent.ʻO ka piko o ka decomposition o kēia manawa o ka pūʻulu hoʻokolohua me VC additive ua neʻe i ka hiki ke kiʻekiʻe, ʻo ia ka mea ma muli o ke kiʻekiʻe o ka uila decomposition o VC additive ma mua o ka EC, No laila, ʻo ka decomposition i hana mua ʻia, ka mea i pale iā EC.Eia naʻe, ʻaʻole i ʻokoʻa loa nā ʻāpana voltammetric o ka electrolyte i hoʻohui ʻia me LiTFSI, lifsi a me littfsi additives me nā mea o ka hui blank, i hōʻike ʻia ʻaʻole hiki i nā mea hoʻohui imide ke hōʻemi i ka decomposition o EC solvent.
Hōʻike ka kiʻi ma luna nei i ka hana electrochemical o ka graphite anode i nā electrolytes like ʻole.Mai ka maikaʻi o ka uku mua a me ka hoʻokuʻu ʻana, ʻo ka coulomb pono o ka hui blank he 93.3%, ʻo ka pono mua o nā electrolytes me LiTFSI, lifsi a me liftfsi he 93.3%, 93.6% a me 93.8%, kēlā me kēia.Eia nō naʻe, ʻo ka pono mua o nā electrolytes me VC additive he 91.5% wale nō, ʻo ia ka mea nui i ka wā o ka intercalation lithium mua o ka graphite, VC decomposes ma ka ʻili o ka graphite anode a hoʻopau i ka Li.
ʻO ka hoʻokumu ʻana o ke kiʻi ʻoniʻoni SEI e loaʻa i kahi mana nui i ka conductivity ionic, a laila pili i ka hana wikiwiki o ka pā Li ion.Ma ka ho'āʻo hoʻokō helu, ʻike ʻia ʻo ka electrolyte me ka lifsi a me nā mea hoʻohui liftfsi he haʻahaʻa haʻahaʻa haʻahaʻa ma mua o nā electrolyte ʻē aʻe i ka hoʻokuʻu ʻana i kēia manawa.I ka ho'āʻo hoʻokele C / 2, paʻa loa ka hana pōʻaiapuni o nā electrolytes āpau me nā mea hoʻohui imide, ʻoiai ke emi nei ka hiki o nā electrolytes me VC additives.
I mea e loiloi ai i ke kūpaʻa o ka electrolyte i ka pōʻai lōʻihi o ka pā lithium-ion, ua hoʻomākaukau pū ʻo VAVARARA sharova i ka LiFePO4 / graphite piha piha me ka pihi pihi, a loiloi i ka hana pōʻai o electrolyte me nā mea hoʻohui like ʻole ma 20 ℃ a me 40 ℃.Hōʻike ʻia nā hopena loiloi ma ka papa ma lalo.Hiki ke ʻike ʻia mai ka papa ʻaina, ʻoi aku ka kiʻekiʻe o ka pono o ka electrolyte me LiTFSI additive ma mua o ka VC additive no ka manawa mua, a ʻoi aku ka nui o ka hana kaʻa uila ma 20 ℃.ʻO ka nui o ka paʻa ʻana o ka electrolyte me LiTFSI additive he 98.1% ma hope o 600 cycles, aʻo ka nui o ka paʻa ʻana o ka electrolyte me VC additive he 79.6% wale nō.Eia naʻe, nalo kēia pono i ka wā e kaʻa ʻia ka electrolyte ma 40 ℃, a ua like nā electrolytes a pau i ka hana paikikala.
Mai ka nānā ʻana i luna, ʻaʻole paʻakikī ke ʻike e hiki ke hoʻomaikaʻi maikaʻi ʻia ka hana pōʻai o ka pā lithium-ion ke hoʻohana ʻia ka paʻakai lithium imide e like me ka mea hoʻohui electrolyte.No ke aʻo ʻana i ka hana hana o nā mea hoʻohui e like me LiTFSI i nā pā lithium-ion, ua kālailai ʻo VARVARA sharova i ke ʻano o ke kiʻi ʻoniʻoni SEI i hana ʻia ma ka ʻili o ka anode graphite i nā electrolytes like ʻole e XPS.Hōʻike ke kiʻi ma lalo nei i nā hualoaʻa hōʻike XPS o ke kiʻiʻoniʻoni SEI i hana ʻia ma ka ʻili o ka anode graphite ma hope o nā pōʻai mua a me ka 50th.Hiki ke ʻike ʻia ʻoi aku ka kiʻekiʻe o ka ʻike LIF i ka kiʻiʻoniʻoni SEI i hoʻokumu ʻia i ka electrolyte me LiTFSI additive ma mua o ka mea i loko o ka electrolyte me VC additive.Hōʻike hou aku ka helu helu helu o ka haku mele SEI kiʻiʻoniʻoni ke kauoha o LIF maʻiʻo ma SEI kiʻiʻoniʻoni he lifsi > liftfsi > LiTFSI > VC > blank pūʻulu ma hope o ka pōʻaiapuni mua, akā ʻaʻole hiki ke hoʻololi ke kiʻi SEI ma hope o ka uku mua.Ma hope o 50 mau pōʻai, ua emi iho ka LIF maʻiʻo o SEI kiʻi ma lifsi a me liftfsi electrolyte e 12% a me 43%, ʻoiai ka LIF maʻiʻo o ka electrolyte i hoʻohui ʻia me LiTFSI i hoʻonui ʻia e 9%.
ʻO ka mea maʻamau, manaʻo mākou ua māhele ʻia ke ʻano o ka membrane SEI i ʻelua mau papa: ka papa inorganic i loko a me ka papa organik waho.Hoʻokumu nui ʻia ka papa inorganic me LIF, Li2CO3 a me nā ʻāpana inorganic ʻē aʻe, ʻoi aku ka maikaʻi o ka hana electrochemical a me ka conductivity ionic kiʻekiʻe.ʻO ka papa honua waho ka mea nui i ka porous electrolyte decomposition a me nā huahana polymerization, e like me roco2li, PEO a pēlā aku, ʻaʻohe ikaika o ka pale ʻana i ka electrolyte, No laila, ke manaʻolana nei mākou e loaʻa i ka membrane SEI nā ʻāpana inorganic.Hiki i nā mea hoʻohui Imid ke lawe mai i nā mea LIF inorganic hou aku i ka membrane SEI, kahi e hoʻoikaika ai i ke ʻano o ka membrane SEI, hiki ke pale maikaʻi i ka decomposition electrolyte i ke kaʻina hana pōʻai, hoʻemi i ka hoʻohana ʻana i ka Li, a hoʻomaikaʻi nui i ka hana pōʻai o ka pā.
E like me nā mea hoʻohui electrolyte, ʻoi aku hoʻi i nā mea hoʻohui LiTFSI, hiki i nā paʻakai lithium imide ke hoʻomaikaʻi maikaʻi i ka hana pōʻai o ka pā.ʻO kēia ma muli o ka loaʻa ʻana o ka kiʻi SEI i hana ʻia ma ka ʻili o ka graphite anode i ʻoi aku ka LIF, ʻoi aku ka lahilahi a me ka paʻa paʻa SEI kiʻiʻoniʻoni, e hōʻemi ana i ka decomposition o ka electrolyte a hoʻemi i ke kūpaʻa interface.Eia naʻe, mai ka ʻikepili hoʻokolohua o kēia manawa, ʻoi aku ka maikaʻi o ka hoʻohui ʻana o LiTFSI no ka hoʻohana ʻana i ka lumi wela.Ma 40 ℃, ʻaʻohe pono o ka LiTFSI additive ma mua o VC additive.
Ka manawa kau: Apr-15-2021