Liquid electrolyte ke Eng?
Mokelikeli oa electrolyte
(1) Motsoako oa lik'hemik'hale Mokelikeli oa electrolyte o boetse o bitsoa tharollo ea electrolyte. Ke electrolyte ea mokelikeli o sebelisoang hangata ka har'a libetri tsa lithium-ion, tse tsejoang hape e le non-elektrolyte ea mokelikeli oa metsi. Organic liquid electrolyte e entsoe ka letsoai la lithium, organic solvent, le additives.
① Letsoai la lithium: haholo-holo e fana ka li-ion tsa conductive. Lithium hexafluorophosphate ke letsoai la lithium le sebelisoang haholo libeteri tsa lithium-ion tsa khoebo. Pure LiPF6 ke kristale e tšoeu, e qhibilihang ka har'a metsoako ea tlhaho e kang alkyl ethers, nitriles, pyridine esters, ketones, le alcohols, empa e qhibiliha hanyenyane ho lihlapolli tsa tlhaho tse kang alkanes le benzene. LiPF6 electrolyte e na le conductivity e batlang e phahame; ka 20℃, conductivity ea EC+DMC (volume ratio 1:1) e ka fihla 10×10-²S/cm. The conductivity hangata e fihla holimo ha mahloriso a electrolyte a le haufi le 1mol/L. LiPF6 e na le ts'ebetso e tsitsitseng ea electrochemical mme ha e senya mokelli oa hona joale. Leha ho le joalo, LiPF6 e na le botsitso bo fokolang ba mocheso 'me e senyeha habonolo metsing, e hlokang taolo e tiileng ea mongobo oa tikoloho nakong ea ho lokisetsa le ho sebelisoa.
② Li-solvents tsa Organic: Mosebetsi oa tsona o ka sehloohong ke ho qhaqha letsoai la lithium, ho nolofalletsa electrolyte ea letsoai la lithium ho etsa li-ion conductive.
Li-solvents tse sebelisoang hangata li kenyelletsa propylene carbonate, dimethyl carbonate, le diethyl carbonate.
Li-solvents tsa 'mele hangata li khethoa bakeng sa boemo ba tsona bo phahameng ba dielectric le viscosity e tlase. Boemo bo phahameng ba dielectric bo etsa hore letsoai la lithium le be bonolo ho qhaqha le ho arohana; viscosity e tlase e fella ka phallo e potlakileng ea ion. Leha ho le joalo, ha e le hantle, li-solvents tse nang le li-contants tse phahameng tsa dielectric li na le viscosity e phahameng, 'me li-solvents tse nang le viscosity e tlaase li na le likhahla tse tlaase tsa dielectric. Ka hona, ho thata hore solvent e le 'ngoe ka nako e le' ngoe e finyelle litlhoko tsena kaofela. Libetri tsa Lithium-hangata li sebelisa motsoako oa metsoako ea tlhaho e nang le dielectric constants tse phahameng le tse nang le viscosity e tlase ho lefella mefokolo ea karolo ka 'ngoe. Ka mohlala, EC carbonates e na le li-constants tse phahameng tsa dielectric, tse molemo bakeng sa ho arohana ha letsoai la lithium, ha DMC, DEC, le EMC carbonates li na le viscosity e tlaase, e thusang ho ntlafatsa lebelo la ho falla ha lithium ion.
③ Li-additives: Ka kakaretso li bapala karolo ea ho ntlafatsa le ho ntlafatsa ts'ebetso ea motlakase le polokeho ea electrolyte. Ka kakaretso, li-additives li na le mesebetsi e meraro e ka sehloohong: aa Ntlafatsa ts'ebetso ea lera la SEI, joalo ka ho eketsa vinylene carbonate (VC), vinyl sulfite (ES), le SO2; b. Thibela ho tjhaja (ka ho kenya biphenyl) le ho feta-ho ntsha; c. Li-additives tse thibelang lelakabe li ka thibela ho tuka kapa ho phatloha ha mocheso o chesa haholo, joalo ka ho kenya li-halogenated flame retardants, phosphorus{7}based fire retardants, le composite flame retardants; d. Fokotsa trace ea metsi le HF content ho electrolyte.
