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AssigneeMitsubishi Chemical Corporation
InventorsMasahiro Takehara, Takashi Fujii, Minoru Kotato, Daisuke Noda, Shinichi Kinoshita, Makoto Ue, Hitoshi Suzuki
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A nonaqueous electrolyte solution for secondary batteries which is an electrolyte solution for secondary batteries obtained by dissolving a lithium salt in a nonaqueous solvent, wherein the nonaqueous solvent is a solvent mainly comprising a lactone compound and the content of hydroxy carboxylic acids in the electrolyte solution is 1 mmol/kg or lower and a secondary battery employing the same are excellent in high-temperature storage characteristics, cycle characteristics, and capacity retention characteristics and in various cell characteristics in a wide temperature range and safety such as firing properties.
A nonaqueous electrolyte solution for secondary batteries which is an electrolyte solution for secondary batteries obtained by dissolving a lithium salt in a nonaqueous solvent, characterized in that the nonaqueous solvent is a solvent mainly comprising a lactone compound and the content of hydroxy carboxylic acids in the electrolyte solution is 1 mmol/kg or lower.
A nonaqueous-electrolyte-solution secondary battery comprising at least a negative electrode comprising lithium metal, a lithium alloy, or a material capable of occluding and releasing lithium, a positive electrode comprising a material capable of occluding and releasing lithium, and an electrolyte solution obtained by dissolving a lithium salt in a nonaqueous solvent, characterized in that the nonaqueous solvent is a solvent mainly comprising a lactone compound and the content of hydroxy carboxylic acids in the electrolyte solution is 1 mmol/kg or lower.
Dependencies are inferred from the claim text.