Acta Chimica Sinica ›› 2022, Vol. 80 ›› Issue (4): 517-525.DOI: 10.6023/A21110529 Previous Articles     Next Articles

Article

三维多孔铜和锌镀层协同构筑无枝晶锂金属电极

樊小勇*(), 张帅, 朱永强, 敬茂森, 王凯鑫, 张露露, 李巨龙, 许磊, 苟蕾, 李东林   

  1. 长安大学材料科学与工程学院 西安 710061
  • 投稿日期:2021-11-23 发布日期:2022-04-28
  • 通讯作者: 樊小勇
  • 基金资助:
    国家自然科学基金面上(22179011); 陕西省国际科技合作计划项目(2020KW-024); 及长安大学研究生科研创新实践项目(300103714015)

Construction of Dendrite-free Lithium Metal Electrode Using Three-Dimensional Porous Copper and Zinc Coatings

Xiaoyong Fan(), Shuai Zhang, Yongqiang Zhu, Maosen Jing, Kaixin Wang, Lulu Zhang, Julong Li, Lei Xu, Lei Gou, Donglin Li   

  1. School of Materials Science and Engineering, Chang'an University, Xi'an 710061
  • Received:2021-11-23 Published:2022-04-28
  • Contact: Xiaoyong Fan
  • Supported by:
    National Natural Science Foundation of China(22179011); International Scientific and Technological Cooperation Projects of Shaanxi Province of China(2020KW-024); Program for Graduate Research Innovation Practice of Chang'an University(300103714015)

Metal Li has been considered as one promising anode due to its high theoretical capacity and the lowest redox potential, however its dendrites growth and volumetric changes during cycling easily cause battery failure and safety hazards. Here a three dimensional (3D) porous Cu with pore size of about 5 μm coated with Zn layer is used as current collector for Li deposition to construct dendrite-free metal Li electrode. The suitable pore size and high stability of 3D Cu is beneficial to decrease local current density and buffer volumetric changes, and the Zn layer can decrease the nucleation overpotential of Li, synergistically induce uniform deposition of Li and effectively suppress the growth of Li dendrites. There is no dendrite appears when the 3D Cu@Zn is used as the current collector even the depositing capacity increases to 4 mAh•cm–2, and displays smooth surface after Li stripping, however, the Li on Cu appears obvious dendrites and non-uniformity, Li on 3D Cu appears local non-uniformity and some dendrites. The semi-cell Li||3D Cu@Zn demonstrates stable coulombic efficiency at 0.5 and 1 mA•cm–2 with a capacity of 1 mAh•cm–2, the symmetrical cell Li||3D Cu@Zn@Li stably cycle for above 700 h at high current density of 2 mA•cm–2 with a capacity of 1 mAh•cm–2. The full cell with 3D Cu@Zn@Li as anode and LiFePO4 as cathode remains 88 mAh•g–1 after 150 cycles, which is much better than those using Cu@Li plate and 3D Cu@Li as the anodes.

Key words: lithium metal, three-dimensional porous copper, zinc, electrodeposition, lithium dendrite