Performance optimization of aqueous Zn/MnO2 batteries through the synergistic effect of PVP intercalation and GO coating

Abstract

Manganese dioxide (MnO₂) electrode material possesses the advantages of high energy density, structural diversity and high modification potential. This allows it become one of the important cathodes for aqueous zinc ion battery. However, the applications are limited by the poor electrical conductivity, narrow layer spacing and the ease of dissolution. Herein, we prepare MnO₂[email protected] composites by the co-modification of polyvinylpyrrolidone (PVP) pre-insertion layer and graphene oxide (GO) self-assembly layer. The Zn//MnO₂[email protected] cells deliver a discharge specific capacity of 442 mAh/g at a current density of 0.2 A/g. It also maintains 100 % capacity for 1000 times cycling at 1 A/g. The assembled soft package batteries demonstrate superior flexibility and adaptability under different bending conditions.