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| Effect of Li1.3Al0.3Ti1.7(PO4)3 coating layer on high-voltage LiNi0.6Co0.1Mn0.3O2 / electrolyte interfacial activity and stability |
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Received:October 23, 2024
Revised:November 10, 2024
Accepted:November 18, 2024
Published Online:January 21, 2025
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| DOI： |
| KeyWord:high-voltage LiNi0.6Co0.1Mn0.3O2; Li1.3Al0.3Ti1.7(PO4)3 coating; interfacial activity; interfacial stability; lthium ion battery |
| Author | Institution |
| Shao Zongpu |
Beijing Easpring Material Technology Co.,Ltd. |
| LIU Yafei |
Beijing Easpring Material Technology Co.,Ltd. |
| YU Yueguang |
China Iron & Steel Research Institute Group Co. Ltd. |
| ZHAO Zhihao |
Northeastern University |
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| Abstract: |
| In order to improve the interfacial activity and stability between NCM613 and electrolyte, Li1.3Al0.3Ti1.7 (PO4)3 (LATP) was coated in NCM613 by liquid-phase method and the effects of coating amount and heat treatment temperature were studied. LATP coating can effectively improve the capacity, rate, and cycling performance of cathode materials, and has a significant improvement effect on the thermal stability for cathode materials under high voltage. The 0.8% LATP coating and 600 oC annealed NCM613 exhibits the highest 197.2mAh?g-1 0.1C discharge specific capacity at 4.4 V (versus Li+/Li), the highest 93.1% 1C/0.1C discharge specific capacity ratio and the best cyclic stability with 96.1% capacity retention after 80 cycles, which is much higher than those of bare material. Besides, the DSC heat release peak temperature is delayed from 271.8 oC to 290.7 oC, and the heat flow is reduced from 459.8J?g-1 to 306.5J?g-1. Coating LATP with high ionic conductivity on the surface of the cathode material can improve the interfacial activity between the NCM and electrolyte, providing the fast lithium ion transport channel. The stable P-O bond in LATP may have pillar effect on surface oxygen and transition metals, preventing side reactions between NCM and electrolyte, and improving the stability of the NCM/electrolyte interface. |
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