| 摘要 |
PROBLEM TO BE SOLVED: To provide a positive electrode active material for a lithium secondary battery with excellent cycle characteristics by specifying the physical property constant of lithium nickelate and specifying the initial discharging capacity of a battery using this lithium nickelate. SOLUTION: When peak intensities as determined by powder X-way diffraction of (006), (012), (101), (003), and (104) planes of lithium nickelate are represented by I006 , I012 , I101 , I003 , and I104 respectively, (I006 +I012 )/I101 =P, I003 /I104 =R, and P/R<=0.41, and the atomic ratio of Li/Ni is 0.98-1.01. A lithium secondary battery is manufactured by using the lithium nickelate for a positive electrode as the positive electrode active material, metallic lithium in a negative electrode, and a solution prepared by dissolving LiPF6 in a mixture of propylene carbonate and ethylene carbonate as an electrolyte, and the initial discharging capacity in a charging/discharging test of the lithium secondary battery at 20 deg.C is 180mAh/g or more in the voltage range of 2.5-4.2V. |
