新型炭材料2021，Vol.36Issue(3)：573-584,12.DOI:10.1016/S1872-5805(21)60037-9
具有高倍率性能的还原氧化石墨烯包覆MnO微球负极用于锂离子电容器
Reduced graphene oxide encapsulated MnO microspheres as an anode for high-rate lithium ion capacitors
摘要
Abstract
Developing an anode material with high-rate Li+ intercalation and stable charge/discharge platform is important for achieving high performance lithium ion capacitors (LICs). Reduced graphene oxide (rGO)-encapsulated MnO microspheres (～2 μm) are obtained by a simple process including solvothermal and calcination techniques. The material contains a large number of meso-pores (～2.8 nm diameter). The MnO/rGO has a favorable cycling stability (846 mAh g-1 at 0.1 A g-1 after 110 cycles) and an out-standing rate performance (207 mAh g-1 at 6.4 A g-1). Kinetic analysis reveals that a pseudocapacitive contribution plays a dominant role for the energy storage. The improvement in the pseudocapacitive behavior is ascribed to the fact that the uniform rGO coating on the MnO provides continuous pathways for electron transport, and the mesoporous structure provides numerous migration paths for Li-ions. Furthermore, MnO/rGO//activated carbon (AC) LICs have a high energy density of 98 Wh kg-1 at a relatively high power density of 10350 W kg-1, and have a capacity retention of 71％ after 5000 cycles at 1.6 A g-1. These outstanding results indicate that the enhanced Li+ intercalation of the anode offsets the kinetic imbalance between the two electrodes.关键词
MnO微球/还原氧化石墨烯/倍率性能/锂离子电容器Key words
MnO microspheres/Reduced graphene oxide/Rate capability/Lithium ion capacitors分类
通用工业技术引用本文复制引用
贾耀,杨哲伟,李慧君,王永祯,王晓敏..具有高倍率性能的还原氧化石墨烯包覆MnO微球负极用于锂离子电容器[J].新型炭材料,2021,36(3):573-584,12.基金项目
National Natural Science Foundation of China(U1710256,U1810204,U1810115). 国家自然科学基金(U1710256,U1810204,U1810115). （U1710256,U1810204,U1810115）
