材料科学
聚合
甲醛
芯(光纤)
电池(电)
壳体(结构)
化学工程
复合材料
聚合物
有机化学
热力学
功率(物理)
化学
物理
工程类
作者
Zi-Xiang Chi,Wei Zhang,Xusheng Wang,Fuquan Cheng,Jitao Chen,Amin Cao,Wan Li
摘要
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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