| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cathode material with lithium silicate for a lithium secondary battery which can achieve both a higher capacity and a higher energy density in the lithium secondary battery. <P>SOLUTION: The cathode material for a lithium secondary battery comprises lithium silicate represented by the compositional formula, Li<SB POS="POST">(2+y-z)</SB>M<SB POS="POST">(1-x-y+z)</SB>A<SB POS="POST">x</SB>Si<SB POS="POST">(1-y-z)</SB>V<SB POS="POST">y</SB>Al<SB POS="POST">z</SB>O<SB POS="POST">4</SB>, where M is one or more elements selected from the group consisting of Fe, Mn and Ni, A is one or more elements selected from the group consisting of Co and Zn, and x, y and z meet the following conditions: 0.1≤x≤0.4; 0<y≤0.4 and 0≤z≤y. In X-rays diffraction measurement with CuKα rays, the ratio (p/q) of a diffraction peak intensity (p) of the lithium silicate at 2θ=24.3±0.2 to the sum total (q) of diffraction peak intensities of the lithium silicate in a range of 21.0≤2θ≤23.0 meets the following condition: 1≤(p/q)≤3. <P>COPYRIGHT: (C)2013,JPO&INPIT |
