Optimizing LiFePO₄@C core-shell structures via the 3-aminophenol-formaldehyde polymerization for improved battery performance.

Abstract

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.

DOI: 10.1021/am506860e

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Cite this paper

@article{Chi2014OptimizingLC, title={Optimizing LiFePO₄@C core-shell structures via the 3-aminophenol-formaldehyde polymerization for improved battery performance.}, author={Zi-xiang Chi and Wei Zhang and Xu-sheng Wang and Fu-quan Cheng and Ji-tao Chen and An-Min Cao and Jin-Song Hu}, journal={ACS applied materials & interfaces}, year={2014}, volume={6 24}, pages={22719-25} }