Active material for lithium secondary battery, lithium secondary battery, and method for producing the same
    5.
    发明授权
    Active material for lithium secondary battery, lithium secondary battery, and method for producing the same 有权
    锂二次电池用活性物质,锂二次电池及其制造方法

    公开(公告)号:US08551659B2

    公开(公告)日:2013-10-08

    申请号:US12734579

    申请日:2008-11-11

    摘要: The active material for a lithium secondary battery includes a solid solution of a lithium transition metal composite oxide having an α-NaFeO2 type crystal structure, in which the composition ratio of Li, Co, Ni, and Mn contained in the solid solution satisfies Li1+(1/3)xCo1−x−yNi(1/2)yMn(2/3)x+(1/2)y (x+y≦1, 0≦y and 1−x−y=z); in an Li[Li1/3Mn2/3]O2(x)-LiNi1/2Mn1/2O2(y)-LiCoO2(z) type ternary phase diagram, (x, y, z) is represented by values in a range present on or within a line of a heptagon (ABCDEFG) defined by the vertexes; point A(0.45, 0.55, 0), point B(0.63, 0.37, 0), point C(0.7, 0.25, 0.05), point D(0.67, 0.18, 0.15), point E(0.75, 0, 0.25), point F(0.55, 0, 0.45), and point G(0.45, 0.2, 0.35); and the intensity ratio between the diffraction peaks on (003) plane and (104) plane measured by X-ray diffractometry before charge-discharge is I(003)/I(104)≧1.56 and at the end of discharge is I(003)/I(104)>1.

    摘要翻译: 锂二次电池用活性物质包括具有α-NaFeO 2型晶体结构的锂过渡金属复合氧化物的固溶体,其中固溶体中所含的Li,Co,Ni和Mn的组成比满足Li1 +( 1/3)xCo1-x-yNi(1/2)yMn(2/3)x +(1/2)y(x + y @ 1,0,y和1-xy = z) 在Li [Li1 / 3Mn2 / 3] O2(x)-LiNi1 / 2Mn1 / 2O2(y)-LiCoO2(z)型三元相图中,(x,y,z)由存在于或 在由顶点定义的七边形线(ABCDEFG)内; 点A(0.45,0.55,0),点B(0.63,0.37,0),点C(0.7,0.25,0.05),点D(0.67,0.18,0.15),点E(0.75,0,0.25), 点F(0.55,0,0.45)和点G(0.45,0.2,0.35); 在充放电前通过X射线衍射测得的(003)面和(104)面衍射峰之间的强度比为I(003)/ I(104)> = 1.56,放电结束时为I( 003)/ I(104)> 1。