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Optimizing LiFePO4@C Core–Shell Structures via the 3‑Aminophenol–Formaldehyde Polymerization for Improved Battery Performance

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journal contribution
posted on 24.12.2014, 00:00 by Zi-xiang Chi, Wei Zhang, Xu-sheng Wang, Fu-quan Cheng, Ji-tao Chen, An-min Cao, Li-jun Wan
Polyanion-type cathode materials are well-known for their low electronic conductivity; accordingly, the addition of conductive carbon in the cathode materials becomes an indispensable step for their application in lithium ion batteries. To maximize the contribution of carbon, a core–shell structure with a full coverage of carbon should be favorable due to an improved electronic contact between different particles. Here, we report the formation of a uniform carbon nanoshell on a typical cathode material, LiFePO4, with the shell thickness precisely defined via the 3-aminophenol–formaldehyde polymerization process. In addition to the higher discharge capacity and the improved rate capability as expected from the carbon nanoshell, we identified that the core–shell configuration could lead to a much safer cathode material as revealed by the obviously reduced iron dissolution, much less heat released during the cycling, and better cyclability at high temperature.

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