Effects of AlF3 Coating on the Electrochemical Performance of Li1.2Mn0.534Ni0.133Co0.133O2 Cathode Materials

Li1.2Mn0.534Ni0.133Co0.133O2 cathode material of lithium ion batteries was prepared by co-precipitation method, and then the cathode material was coated by AlF3. The experiment results showed that the electrochemical properties of AlF3-coated material were improved obviously. Before coating, the initial discharge capacity was 253 mAh.g(-1) at 0.2C with a charge/discharge efficiency of only 88.8%. However, after coating, the initial discharge capacity was 294 mAh.g(-1) at 0.2C with a charge/discharge efficiency of 96.4%. Similarly, the capacity retention was also improved through AlF3 coating. The pristine material delivered a discharge capacity of only 185 mAh.g(-1) (with capacity retention of 82.2%) after 50 charge/discharge cycles at 1.0C. Meanwhile, the AlF3-coated material delivered a discharge capacity of 222 mAh.g(-1) (with capacity retention of 96.5%) after 50 charge/discharge cycles at 1.0C.