LITHIUM-NICKEL-MANGANESE-COBALT-BASED COMPOSITE OXIDE POWDER FOR POSITIVE ELECTRODE MATERIAL OF LITHIUM SECONDARY BATTER, ITS PRODUCING METHOD, POSITIVE ELECTRODE FOR LITHIUM SECONDARY BATTERY AND LITHIUM SECONDARY BATTERY USING IT

摘要

PROBLEM TO BE SOLVED: To provide a lithium-nickel-manganese-cobalt-based composite oxide powder for positive electrodes of lithium secondary batteries which has combined properties of low-cost, high-voltage resistance, high security, and enhanced battery property when it is used as a positive material of a lithium secondary.

SOLUTION: The lithium-nickel-manganese-cobalt-based composite oxide powder for lithium secondary battery positive electrode material is formed by including a crystalline structure which belongs to a layered structure and has a composition represented by the formula (I) below and volume resistivity ρ: 1×105Ω cm<ρ<8×106Ω cm, when it is consolidated at 40 MPa. Formula (I): Li[Liz/(2+z)ä(LixNi(1-3x)/2Mn(1+x)/2)1-yCoy}2/(2+z)]O2, where 0.15COPYRIGHT: (C)2007,JPO&INPIT