中國(guó)有色金屬學(xué)報(bào)(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 25 No. 2 February 2015 |
（1. Beijing Key Laboratory of Environmental Science and Engineering,
School of Chemical Engineering and the Environment, Beijing Institute of Technology, Beijing 100081, China;
2. Ningde Amperex Technology Ltd, Research Institute, Ningde 352100, China;
3. National & Local United Engineering Laboratory for Power Battery,
Institute of Functional Materials, Department of Chemistry, Northeast Normal University, Changchun130024, China;
4. Hongsen Material Co,. Ltd., Guangzhou 510730, China）
Abstract:A Co-Mg co-substituted LiNi0.87Co0.10Mg0.03O2 cathode material was prepared by a co-precipitation method. The prepared LiNi0.87Co0.10Mg0.03O2 exhibits excellent electrochemical properties, such as initial discharge capacities of 202.6 mA？h/g and 190.5 mA？h/g at 0.2C and 1C rate, respectively, in operating voltage range of 3.0-4.3 V (versus Li+/Li). The capacity retentions are 96.1% and 93.4% at 0.2C and 1C, respectively, after 50 cycles. Moreover, the cycle performance of the sample was investigated in a 053048-type square Li ion battery. This type of battery can keep 81.7% of initial capacity after 500 charge-discharge cycles at 1C rate, which is close to that of commercial LiCoO2 battery. Therefore, the as-prepared material is capable of such high energy applications as portable product power.
Key words: lithium-ion batteries; cathode material; co-precipitation method; cobalt-magnesium co-substitution; electrochemical properties
