Wang Shouling, Wang Ronghua, Chang Jie, Hu Ning, Xu Chaohe
School of Chemistry and Materials Engineering, Chizhou University, Chizhou, 247000, China.
College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China.
Sci Rep. 2018 Feb 16;8(1):3182. doi: 10.1038/s41598-018-21436-4.
A self-supporting CoO/graphene hybrid film has been constructed via vacuum filtration of Co(OH) nanosheet and graphene, followed by a two-step thermal treatment. Within the hybrid film, CoO nanoparticles with size of 40~60 nm uniformly in-situ grew on the surface of graphene, forming a novel porous and interleaved structure with strong interactions between CoO nanoparticles and graphene. Such fascinating microstructures can greatly facilitate interfacial electron transportation and accommodate the volume changes upon Li ions insertion and extraction. Consequently, the binder-less hybrid film demonstrated extremely high reversible capacity (1287.7 mAh g at 0.2 A g), excellent cycling stability and rate capability (1110 and 800 mAh g at 0.5 and 1.0 A g, respectively).
通过对氢氧化钴纳米片和石墨烯进行真空过滤，然后进行两步热处理，构建了一种自支撑的氧化钴/石墨烯混合薄膜。在混合薄膜中，尺寸为40~60纳米的氧化钴纳米颗粒在石墨烯表面均匀原位生长，形成了一种新型的多孔交错结构，氧化钴纳米颗粒与石墨烯之间具有很强的相互作用。这种迷人的微观结构可以极大地促进界面电子传输，并适应锂离子嵌入和脱嵌时的体积变化。因此，无粘结剂混合薄膜表现出极高的可逆容量（在0.2 A g时为1287.7 mAh g）、优异的循环稳定性和倍率性能（在0.5和1.0 A g时分别为1110和800 mAh g）。
