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| Study on the Surface modification of LiNi0.6Co0.2Mn0.2O2 coated with TiO2 |
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Received:May 12, 2020
Revised:June 02, 2020
Accepted:June 03, 2020
Published Online:January 29, 2021
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| DOI： |
| KeyWord:LiNi0.6Co0.2Mn0.2O2(NCM622); Ternary cathode materials; TiO2-coating |
| Author | Institution |
| Jiang Huawei |
Beijing Easpring Material Technology Co,Ltd |
| Liu Yafei |
Beijing Easpring Material Technology Co,Ltd |
| chenyanbin |
BEI EASPRING MATERIAL TECHNOLOGY CO.,LTD |
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| Abstract: |
| In order to further improve the performance of LiNi0.6Co0.2Mn0.2O2 bare(NCM622),The effects of heat treatment temperature and holding time on the physical and electrical properties of bare were studied by a simple dry coating method. X-ray diffraction (XRD), scanning electron microscopy (SEM), coin cell and full cell tests show that there are obvious coating substance on the surface of the material, but no new phase is formed. When heat treatment temperature is 500°C and holding time is 10h, the discharge capacity of NCM622 is 181.2mAh/g at 0.1C over 3.0～4.3V, which is 2.6mAh/g higher than that of uncoated, and its capacity retention increases from 95% to 97.2% after 80 cycles at 1C and 45°C over 3.0～4.4V. The coating material consumes the residual alkali of the bare surface, alleviates the chemical erosion of the electrolyte. The cycle life and storage performance of the material are improved. The swelling rate decreases from 8.3% to 4.5%, and the capacity retention and capacity recovery increases from 89.1% and 90.2% to 94.3% and 99.1%, respectively. |
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