Layered lithium nickel manganese cobalt based composite oxide powder for positive electrode material of lithium secondary battery, production method thereof, positive electrode for lithium secondary battery using the same, and lithium secondary battery

摘要

PPROBLEM TO BE SOLVED: To provide layered lithium nickel manganese cobalt based composite oxide powder for a positive electrode material of a lithium secondary battery, capable of obtaining compatibility of a low cost, high safety, and enhancement of battery performance when using it for the positive electrode material of the lithium secondary battery. PSOLUTION: As to this layered lithium nickel manganese cobalt based composite oxide powder for the positive electrode material of the lithium secondary battery, its composition is expressed by the formula (1): LiSB1+z/SBNiSBx/SBMnSBy/SBCoSB1-x-y/SBOSB/SB(wherein, 0z0.91, 0.1x0.55, 0.20y0.90, 0.50x+y1, and 1.93), its volume resistivity of 510SP5/SPcm or less when consolidating it by a pressure of 40 MPa, and when contained carbon concentration is expressed by C (weight %), and a BET specific surface area is expressed by S (mSP2/SP/g), the C/S value is 0.025 or less. In a limited composition range, the volume resistivity is lowered to a specified value or less, and the contained carbon concentration is also substantially reduced. Thereby, lowering its cost, making it highly safe, and enhancing battery performance can be made compatible. PCOPYRIGHT: (C)2006,JPO&NCIPI