• 文献标题:   Carbon-Coated MnO Quantum Dot-Decorated Three-Dimensional Graphene Aerogel Composite for High-Performance Lithium-Ion Batteries
  • 文献类型:   Article
  • 作  者:   LIU R, ZHAO XN, ZHAO HB, LIANG L, ZHAO SL, ZHANG YW
  • 作者关键词:  
  • 出版物名称:   ENERGY FUELS
  • ISSN:   0887-0624 EI 1520-5029
  • 通讯作者地址:  
  • 被引频次:   0
  • DOI:   10.1021/acs.energyfuels.3c003506240
  • 出版年:   2023

▎ 摘  要

Herein, carbon-coated MnO QDs decorated on a graphene aerogel (GA, C@MnO QDs/GA) were fabricated by forming a manganese oxide gel in situ on the GA, followed by supercritical drying and carbonization. The composite combines the uniform distribution of ultra-small MnO QDs and the conducting GA with the 3D porous interconnected network structure. The well-dispersed tiny MnO quantum dots can buffer the volume change and shorten the ion diffusion path to improve the reaction kinetics. The GA can provide a 3D conductive channel for rapid electron transfer and Li+ diffusion. When used as anodes for Li-ion batteries, C@MnO QDs/GA electrodes displayed superior electrochemical performance, such as ultra-high discharge capacity, excellent cycling stability, and outstanding rate performance. A high discharge capacity of 1698 mA h g-1 was delivered after 100 cycles at 200 mA g-1, and a capacity of 702 mA h g-1 can be retained at a high current density of 2000 mA g-1. The results suggest that the C@MnO QDs/GA materials designed in this work can be potential anodes for high-performance LIBs, providing meaningful implications for further exploration of oxide anodes for next-generation alkali metal-ion batteries.