The influence of compositional change of 0.3Li 2MnO 3·0.7LiMn 1− xNi yCo 0.1O 2 (0.2 ≤ x ≤ 0.5, y = x − 0.1) cathode materials prepared by co-precipitation

Abstract

Cathode materials prepared by a co-precipitation are 0.3Li 2MnO 3·0.7LiMn 1− x Ni y Co 0.1O 2 (0.2 ≤ x ≤ 0.4) cathode materials with a layered-spinel structure. In the voltage range of 2.0–4.6 V, the cathodes show more than one redox reaction peak during its cyclic voltammogram. The Li/0.3Li 2MnO 3·0.7LiMn 1− x Ni y Co 0.1O 2 ( x = 0.3, y = 0.2) cell shows the initial discharge capacity of about 200 mAh g −1. However, when x = 0.2 and y = 0.1, the cell exhibits a rapid decrease in discharge capacity and poor cycle life.