Non-aqueous electrolyte and lithium secondary battery

Details Non-aqueous electrolyte and lithium secondary battery Non-aqueous electrolyte and lithium secondary battery

H - Electricity

01

M

H01M 10/26 (2006.01) H01M 10/40 (2006.01) H01M 6/16 (2006.01)

Patent

CA 2181973

It is provided a non-aqueous electrolyte comprising a non-aqueous solvent and a lithium salt, said non-aqueous electrolyte containing a halogen-substituted ether compound represented by the general formula [I]: R1-O-R2 [I] (wherein R1 is an alkyl or halogen-substituted alkyl group having 2 or less carbon atoms and R2 is a halogen-substituted alkyl group having 2 to 10 carbon atoms) and at least one sort of a compound in which a mixed solvent as the non-aqueous solvent obtained by adding the compound to the halogen-substituted ether compound is capable of dissolving the lithium salt in an amount of not less than 0.5 mol/litter, and a lithium secondary battery comprising a cathode that can be doped/undoped with lithium ions, an anode of a lithium metal or alloy or an anode that can be doped/undoped with lithium ions and the non-aqueous electrolyte described above. A lithium secondary battery using the non-aqueous electrolyte above is superior in cycle life, for repeating charging/discharging and low-temperature capacity, particularly superior in high-rate capacity, and causes little deterioration of high-rate capacity due to cycles.

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