公开(公告)号：EP2660907A4

公开(公告)日：2016-12-21

申请号：EP11852696

申请日：2011-12-27

申请人： GS YUASA INT LTD

发明人： ENDO DAISUKE ,  KATAYAMA YOSHIHIRO ,  MURAI TETSUYA ,  SHIBATA MASAFUMI

IPC分类号： H01M4/525 ,  C01G53/00 ,  H01B1/08 ,  H01M4/505 ,  H01M10/052 ,  H01M10/44

CPC分类号： H01M4/505 ,  C01G45/1221 ,  C01G45/1228 ,  C01G51/44 ,  C01G51/50 ,  C01G53/44 ,  C01G53/50 ,  C01P2002/72 ,  C01P2002/74 ,  C01P2002/77 ,  C01P2004/61 ,  C01P2006/11 ,  C01P2006/12 ,  C01P2006/40 ,  H01B1/08 ,  H01M4/0471 ,  H01M4/131 ,  H01M4/1391 ,  H01M4/525 ,  H01M10/052 ,  H01M10/0525 ,  H01M2004/028 ,  Y02E60/122 ,  Y02P70/54 ,  Y02T10/7011

摘要： An object of the present invention is to provide a positive active material for a nonaqueous electrolyte secondary battery which has a large discharge capacity and is superior in charge-discharge cycle performance, initial efficiency and high rate discharge performance, and a nonaqueous electrolyte secondary battery using the positive active material. The present invention pertains to a positive active material for a nonaqueous electrolyte secondary battery containing a lithium transition metal composite oxide which has a crystal structure of an ±-NaFeO 2 type, is represented by a compositional formula Li 1+± Me 1-± O 2 (Me is a transition metal element including Co, Ni and Mn, ± > 0), and has a molar ratio Li/Me of Li to the transition metal element Me of 1.2 to 1.6, wherein a molar ratio Co/Me of Co in the transition metal element Me is 0.02 to 0.23, a molar ratio Mn/Me of Mn in the transition metal element Me is 0.62 to 0.72, and the lithium transition metal composite oxide is observed as a single phase attributed to a space group R3-m on an X-ray diffraction chart when it is electrochemically oxidized up to a potential of 5.0 V (vs. Li/Li + ).

摘要翻译： 本发明的一个目的是提供一种用于具有大的放电容量和在充放电循环性能，初始效率和高速率放电性能优良的非水电解质二次电池提供正极活性材料，和一种非水电解质二次电池用 的正极活性物质。 键入本发明涉及的正极活性物质为含有具有一个-NaFeO±2的晶体结构的锂过渡金属复合氧化物的非水电解质二次电池中，由组成式Li 1 +±1±我0所表示 2（Me为过渡金属元素含有Co，Ni和Mn，±> 0），并且具有的摩尔比锂/ Me的Li与过渡金属元素的1.2〜1.6 Me中，worin的摩尔比Co / Me的钴的 在过渡金属元素Me为12:02到12点23分，摩尔比的Mn / Me的Mn的过渡金属元素Me为0.62〜0.72，和锂过渡金属复合氧化物中观察到，作为归属于空间群R3的单相 到的X射线衍射图表米当电化学氧化高达5.0 V（相对于Li / Li +）的电位。