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    • 5. 发明公开
    • LITHIUM SECONDARY BATTERY COMPRISING NON-AQUEOUS ELECTROLYTE
    • LITHIUMSEKUNDÄRBATTERIEMITNICHTWÄSSRIGEMELEKTROLYT
    • EP3076474A4
    • 2017-08-02
    • EP15846518
    • 2015-09-30
    • LG CHEMICAL LTD
    • YU SUNG-HOONYANG DOO-KYUNGLEE MIN-HYUNGJEON JONG-HO
    • H01M10/0569H01M4/505H01M4/525H01M10/0525H01M10/0567
    • H01M10/0569H01M4/131H01M4/502H01M4/505H01M4/523H01M4/525H01M10/0525H01M10/0567H01M2220/20H01M2220/30H01M2300/004Y02T10/7011
    • Disclosed is a lithium secondary battery including a positive electrode, a negative electrode, a separator and a nonaqueous electrolyte, wherein the positive electrode includes Li a Ni x Mn y Co z O 2 (a+x+y+z=2, 0.9‰¤a‰¤1.1, 0‰¤x, 0‰¤y, 0‰¤z) as a positive electrode active material, and wherein the nonaqueous electrolyte includes (i) fluorinated cyclic carbonate expressed by Chemical Formula 1 below, (ii) propionate-based ester expressed by Chemical Formula 2 below, and (iii) non-halogenated carbonate, so that a mixture weight ratio (i : ii) thereof is 20:80 to 50:50: wherein, in Chemical Formula 1, R 1 , R 2 , R 3 and R 4 are independently any one of F, H and methyl group, and at least one thereof is F, wherein, in Chemical Formula 2, R 5 is alkyl group having 1 to 5 carbons. The lithium secondary battery may ensure stability of an electrolyte even though a loading amount of a positive electrode is increased to implement a high-voltage battery system, thereby allowing excellent cycle characteristics of the battery. In addition, it is possible to prevent degradation of the battery performance at high-temperature storage.
    • 公开了包括正极,负极,隔膜和非水电解质的锂二次电池,其中正极包括Li a Ni x Mn y Co z O 2(a + x + y + z = 2,0.9‰ (i)由以下化学式1表示的氟化环状碳酸酯,(ii)包含下述化学式1表示的氟化环状碳酸酯的非水电解质, 丙烯酸酯类酯和(iii)非卤代碳酸酯,使得其混合重量比(i:ii)为20:80至50:50:其中在化学式1中,R 1 R 2,R 3和R 4独立地为F,H和甲基中的任一个,且其至少一个为F,其中在化学式2中,R 5为具有1至5个碳的烷基。 即使提高正极的负载量以实现高电压电池系统,锂二次电池也可以确保电解质的稳定性,由此允许电池的优异的循环特性。 另外,可以防止高温存储时电池性能的下降。