Acta Chimica Sinica ›› 2021, Vol. 79 ›› Issue (2): 200-207.DOI: 10.6023/A20090428 Previous Articles     Next Articles



李燕丽1, 于丹丹1, 林森1, 孙东飞1,*(), 雷自强1()   

  1. 1 西北师范大学化学化工学院 生态功能高分子材料教育部重点实验室 兰州 730070
  • 投稿日期:2020-09-16 发布日期:2020-12-18
  • 通讯作者: 孙东飞
  • 作者简介:
  • 基金资助:
    国家自然科学基金(51863019); 甘肃省自然科学基金(20JR10RA108); 甘肃省高等学校创新基金项目(2020A-013)

Preparation of α-MnO2 Nanorods/Porous Carbon Cathode for Aqueous Zinc-ion Batteries

Yanli Li1, Dandan Yu1, Sen Lin1, Dongfei Sun1,*(), Ziqiang Lei1()   

  1. 1 Laboratory of Eco-functional Polymer Materials of the Ministry of Education, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China
  • Received:2020-09-16 Published:2020-12-18
  • Contact: Dongfei Sun
  • Supported by:
    National Natural Science Foundation of China(51863019); Natural Science Foundation of Gansu Province of China(20JR10RA108); Innovation Fund of Gansu Universities(2020A-013)

Aqueous zinc-ion batteries (ZIBs) have attracted more attention as large-scale energy storage technology due to their high safety, low cost and environmental benignity. To date, numerous cathodes based on manganese dioxide, vanadium dioxide, and polyanionic compounds have been reported. Among them, Manganese oxides have the advantages of low cost, non-toxicity, abundant materials and high working voltage, have been widely explored as promising cathodes for zinc ion batteries. Among them, MnO2 cathodes are particularly desirable candidates for commercialization owing to their tunnel structure and affordability. α-MnO2has (1×1) and (2×2) tunnel structures, and Zn2+ can rapidly inserted and deserted in the tunnel. However, the capacity of manganese dioxide is fast decaying with the cycles due to the poor conductivity of MnO2, which limits its electrochemical performance. Herein, α-MnO2 nanorods are uniformly distributed on the surface of porous carbon nanosheets network (PCSs) by a simple hydrothermal/dispersion method strategy. In the α-MnO2/PCSs architecture, the α-MnO2 nanorods and α-MnO2/PCSs composite were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), etc. The results testified that α-MnO2/PCSs nanorods were firmly adhered on the surface of porous carbon nanosheets, which can effectively avoid the stacking of α-MnO2nanorods, while the high conductive carbon network can improve the electrical conductivity of the composite. The porous network can provide effective electron transfer channels, provide stable hosts for fast Zn2+ extraction/insertion, and prevent the α-MnO2nanorods from stacking each other. Benefiting from the unique porous structure and high conductive network, the α-MnO2/PCSs hybrid shows high reversibility capacity, good rate performance, and outstanding cycling stability. Specifically, α-MnO2/PCSs exhibits high reversible capacity of 350 mAh•g–1 after 100 cycles at 0.1 A•g–1 and maintains a capacity of 160 mAh•g–1 at a high rate of 1 A•g–1 after 1000 cycles, thus making it promising cathode for the high performance ZIBs.

Key words: aqueous zinc ion battery, cathode material, α-MnO2 nanorods, porous carbon nanosheets, electrochemical performance