Synthesis and electrochemical properties of LiNi0.87Co0.10Mg0.03O2 cathode materials
(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)
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