Abstract
The progress of zinc(Zn)metal batteries(ZMBs)is greatly limited by poor cycling stability because of the mutual restrictions of dendrite growth,corrosion reactions,and passivation.In this work,an ultra-long lifespan(～7800 h),dendrite-free Zn metal anode is enabled via fabricating a functional hydrogel electrolyte out of polyacrylamide/graphene oxide(GO)/agarose(PGA)with a multifully cross-linked net-work.The synergetic integration of GO nanosheets and double-network structure endows the PGA hy-drogel electrolyte with high ionic conductivity and excellent mechanical performance.More importantly,the abundant hydrophilic groups and stable three-dimensional cross-linked network of PGA electrolyte effectively constrain Zn2+diffusion laterally along the Zn surface,which simultaneously prohibits water-induced corrosion and thus significantly enhances Zn anode reversibility.Both theoretical simulations and experiments reveal that the PGA electrolyte is capable of optimizing de-solvation kinetics and harmoniz-ing Zn2+flux at the electrolyte-electrode interface,ensuring uniform Zn2+deposition.Consequently,an ultra-long lifespan of 7800 h is achieved in the symmetric cell with the PGA electrolyte.Even at a high Zn utilization of 42.7％,it still delivers stable cycling over 1100 h.This work provides a practical and benefi-cial approach to dramatically extending the lifespan of the Zn anode and thus achieving high-performance ZMBs.
基金项目
National Key R&D Program of China(2020YFC1910200)
National Natural Science Foundation of China(51873011)
National Natural Science Foundation of China(U1664251)
NETL
NSTL
万方数据