CATHODE ACTIVE MATERIAL FOR NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY AND MANUFACTURING METHOD FOR SAME, AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

Provided is a cathode active material for a non-aqueous electrolyte secondary battery, with which it is possible to improve the output characteristics during use in extremely low-temperature environments. A lithium compound is mixed with nickel cobalt manganese composite hydroxide particles that are expressed by the general formula: NixCoyMnzMt(OH)2+a (where x+y+z+t=1, 0.30≦×≦0.70, 0.10 ≦y≦0.40, 0.10 ≦z≦0.40, 0≦t≦0.01, and M is one or more elements selected from Mg, Ca, Al, Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, and W) such that the ratio of the number of lithium atoms to the total number of atoms of metal elements other than lithium is 1:0.95 to 1.20. The lithium mixture undergoes calcination in an oxidizing atmosphere so that the rate of temperature rise in a temperature range of at least 30° C. to 800° C. is 4° C. /min to 10° C./min, the calcination temperature is 800° C. to 1000° C., the maintenance time at the calcination temperature is 5 hours or less, and the time from the start of temperature rise to the end of the maintenance time is 3.0 hours to 7.0 hours.

主权项

1. A cathode active material for a non-aqueous electrolyte secondary battery expressed by a general formula (A): Li1+aNixCoyMnzMtO2 (where −0.05≦a≦0.20, x+y+z+t=1, 0.30≦x≦0.70, 0.10≦y≦0.40, 0.10≦z≦0.40, 0≦t≦0.01, and M is one or more element selected from among Ca, Mg, Al, Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, and W), and includes layered hexagonal crystal lithium nickel cobalt manganese composite oxide particles; and the ratio of the integrated width of the diffraction peak on plane (104) with respect to the integrated width of the diffraction peak on plane (003) of the Miller indices (hkl) in powder X-ray diffraction that uses CuKα rays is 1.38 or greater.