申请人:Koh Meiten
公开号:US09070951B2
公开(公告)日:2015-06-30
The present invention provides a solvent for a nonaqueous electrolyte solution enabling a lithium secondary battery to exhibit an excellent discharge capacity, load characteristics, and cycle characteristics even under high voltages, as well as a nonaqueous electrolyte solution that uses this solvent and a lithium secondary battery. This solvent for a nonaqueous electrolyte solution is a solvent for a nonaqueous electrolyte solution for a lithium secondary battery, wherein the solvent for a nonaqueous electrolyte solution contains a fluorine-free cyclic carbonate (I), a fluorine-free chain carbonate (II), and a 1,1-di(fluorinated alkyl)ethylene carbonate (III), and wherein with a sum of (I), (II), and (III) being 100 volume %, the fluorine-free cyclic carbonate (I) is 10 to 50 volume %, the fluorine-free chain carbonate (II) is 49.9 to 89.9 volume %, and the 1,1-di(fluorinated alkyl)ethylene carbonate (III) is from at least 0.1 volume % to not more than 30 volume %.
本发明提供了一种用于非水电解质溶液的溶剂,使锂二次电池在高电压下展现出优异的放电容量、负载特性和循环特性,以及使用该溶剂的非水电解质溶液和锂二次电池。该非水电解质溶液的溶剂是一种用于锂二次电池的非水电解质溶液的溶剂,其中该非水电解质溶液的溶剂包含无氟环状碳酸酯(I)、无氟链状碳酸酯(II)和1,1-二(氟烷基)乙烯碳酸酯(III),并且在(I)、(II)和(III)的总和为100体积%的情况下,无氟环状碳酸酯(I)为10至50体积%,无氟链状碳酸酯(II)为49.9至89.9体积%,1,1-二(氟烷基)乙烯碳酸酯(III)为至少0.1体积%至不超过30体积%。