Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5438551 | Ceramics International | 2017 | 6 Pages |
Abstract
LiNi1/3Co1/3Mn1/3O2 cathode coated with a thin layer of graphene (~8 nm) is successfully synthesized by self-assembly and pyrolysis of polyelectrolyte layers on the surface of NMC particles. The graphene coated NMCs still possess a layered structure with good crystallinity and demonstrate a superior electrochemical performance (e.g., rate capability and cycling stability). The best graphene coated NMC cathode is prepared at a calcination temperature of 800 °C, exhibiting a capacity retention of ~90% vs. 78% for pristine NMC @ cycle 100 and 1 C rate. The improvement in cycling performance is further enlarged after 500 cycles (74% vs. 51%). This can be attributed to the dual functions of graphene coating in enhancing electronic conductivity and protecting NMC surface from the contact with electrolyte during the electrochemical reaction.
Related Topics
Physical Sciences and Engineering
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Authors
Fanglin Wu, Yizhi Yan, Rui Wang, Haopeng Cai, Wei Tong, Haolin Tang,