3D Porous Copper Skeleton Supported Zinc Anode toward High Capacity and Long Cycle Life Zinc Ion Batteries
2019-01-07T00:00:00Z (GMT) by
Zinc 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 MnO<sub>2</sub> nanosheet cathode, and Zn<sup>2+</sup>-containing aqueous electrolyte delivered a record-high capacity of 364 mAh g<sup>–1</sup> at a current density of 0.1 A g<sup>–1</sup> and good cycling stability with a retained capacity of 173 mAh g<sup>–1</sup> after 300 charge/discharge cycles at 0.4 A g<sup>–1</sup>. This work provides a pathway for developing high-performance ZIBs.