Pomegranate Clusters of N-Doped Carbon-Coated CoO x Supported on Graphene as a Flexible Lithium-Ion Battery Anode

作者：Yue Kong, Yu Luo, Jian Ma, Jiabin Tang, Yanshan Huang, Mingan Zhou, Sheng Han · 发表于：ACS Applied Energy Materials · 年份：2022 · DOI：10.1021/acsaem.2c00388 · 被引用次数：22 · 研究领域：Advancements in Battery Materials、Supercapacitor Materials and Fabrication、Advanced Battery Materials and Technologies

Due to the large reversible capacities, transition-metal oxides have received a lot of interest as anodes for lithium-ion batteries. However, their poor electrical conductivity and dramatic volume change prevent them from being widely used in lithium-ion batteries. In this study, we present a double protection strategy by fabricating a pomegranate-like N-doped carbon-coated CoO x clusters supported on three-dimensional (3D) graphene framework structure (NC@CoO x @GF) to improve the electrochemical performance of CoO x in lithium storage. The hierarchical structure is constructed by the thermal transformation of Co-MOF to CoO x with N-doped carbon/graphene by using polyaniline-coated metal–organic framework (Co-MOF)/graphene oxide as precursors. The pomegranate clusters coupled with porous CoO x induced by the partial thermal collapse of the MOF with N-doped carbon were derived from polyaniline and 3D high-conductivity graphene frameworks. The confinement of the clusters effectively relieves the volume expansion of CoO x and significantly shortens the transport paths of electrons and ions in the composite. The robust 3D graphene frameworks further offer highly interpenetrated conductive networks. Therefore, the flexible NC@CoO x @GF anode delivered a high capacity (at 0.1 A g –1, 1153 mA h g –1 ), excellent rate performance (at 8 A g –1, 337 mA h g –1 ), and superlong cycling stability (66.4% capacity retention after 2500 cycles at 1000 mA g –1 ).