Low-Temperature Performance of the Li[Li0.2Co0.4Mn0.4]O2 Cathode Material Studied for Li-Ion Batteries
The Li[Li0.2Co0.4Mn0.4]O2 cathode material was prepared by a sol-gel method. Combinative X-ray diffraction (XRD) studies showed that the material was a solid solution of LiCoO2 and Li2MnO3. The material showed a reversible discharge capacity of 155.0 mAhg−1 at -20 °C, which is smaller than that at room temperature (245.5 mAhg−1). However, the sample exhibited capacity retention of 96.3 % at -20 °C, only 74.2 % at 25 °C. The good electrochemical cycle performance at low temperature was due to the inexistence of Mn3+ in the material.
Weiguo Pan, Jianxing Ren and Yongguang Li
Y. H. Wang et al., "Low-Temperature Performance of the Li[Li0.2Co0.4Mn0.4]O2 Cathode Material Studied for Li-Ion Batteries", Advanced Materials Research, Vols. 347-353, pp. 3662-3665, 2012