POSITIVE ELECTRODE AND LITHIUM ION SECONDARY BATTERY USING THEREOF

摘要

A lithium ion secondary battery with a high electrode density and an excellent rate discharge characteristic. The positive electrode includes a positive electrode active material of a compound represented by Lia(NixCoyAl1−x−y)O2 (0.95:≦a≦1.05, 0.5≦x≦0.9, 0.05≦y≦0.2), and carbon adhered to the surface of the material, in the Raman spectrum using a laser of 532 nm, the positive electrode includes a peak PA (D band) at 1200˜1450 cm−1, a peak PB (G band) at 1450˜1700 cm−1 and a peak PC at 400˜600 cm−1, and when the intensities are normalized by regarding the maximum intensity as 1 and the minimum intensity as 0 in the wavenumber domain of 200˜1800 cm−1, Raman intensity of the minimum (V band) between the two peaks of said peak PA and said peak PB is 0.6 or less, and Raman intensity of said peak PC is 0.1 or more and 0.5 or less.

主权项

1. A positive electrode comprising,
a positive electrode active material and carbon adhered to the surface of said positive electrode active material, wherein, said positive electrode active material is represented by the following formula (1),
Lia(NixCoyAl1−x−y)O2  (1) wherein, 0.95≦a≦1.05, 0.5≦x≦0.9, 0.05≦y≦0.2, in the Raman spectrum using an argon ion laser, said positive electrode includes a peak PA (D band) at 1200˜1450 cm−1, a peak PB (G band) at 1450˜1700 cm−1 and a peak PC at 400˜600 cm−1, and when the intensities are normalized by regarding the maximum intensity as 1 and regarding the minimum intensity as 0 in the wavenumber domain of 200˜1800 cm−1, Raman intensity of the minimum (V band) between the two peaks of said peak PA and said peak PB is 0.6 or less, and Raman intensity of said peak PC is 0.1 or more and 0.5 or less.