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3D Porous Copper Skeleton Supported Zinc Anode toward High Capacity and Long Cycle Life Zinc Ion Batteries
journal contribution
posted on 2019-01-07, 00:00 authored by Zhuang Kang, Changle Wu, Liubing Dong, Wenbao Liu, Jian Mou, Jingwen Zhang, Ziwen Chang, Baozheng Jiang, Guoxiu Wang, Feiyu Kang, Chengjun XuZinc
ion batteries (ZIBs) have attracted extensive attention in
recent years, benefiting from their high safety, eco-friendliness,
low cost, and high energy density. Although many cathode materials
for ZIBs have been developed, the poor stability of zinc anodes caused
by uneven deposition/stripping of zinc has inevitably limited the
practical application of ZIBs. Herein, we report a highly stable 3D
Zn anode prepared by electrodepositing Zn on a chemically etched porous
copper skeleton. The inherent excellent electrical conductivity and
open structure of the 3D porous copper skeleton ensure the uniform
deposition/stripping of Zn. The 3D Zn anode exhibits reduced polarization,
stable cycling performance, and almost 100% Coulombic efficiency as
well as fast electrochemical kinetics during repeated Zn deposition/stripping
processes for 350 h. Furthermore, full cells with a 3D Zn anode, ultrathin
MnO2 nanosheet cathode, and Zn2+-containing
aqueous electrolyte delivered a record-high capacity of 364 mAh g–1 at a current density of 0.1 A g–1 and good cycling stability with a retained capacity of 173 mAh g–1 after 300 charge/discharge cycles at 0.4 A g–1. This work provides a pathway for developing high-performance
ZIBs.