Boosting Cycling Stability of Polymer Sodium Battery by “Rigid-Flexible” Coupled Interfacial Stress Modulation
journal contribution
posted on 2024-11-17, 13:50authored byJun Pan, Shumao Xu, Tianxun Cai, Lulu Hu, Xiangli Che, Wujie Dong, Zhiyuan Shi, Alok Kumar Rai, Nana Wang, Fuqiang Huang, Shi Xue Dou
The discontinuous interfacial contact of solid-state polymer metal batteries is due to the stress changes in the electrode structure during cycling, resulting in poor ion transport. Herein, a rigid-flexible coupled interface stress modulation strategy is developed to solve the above issues, which is to design a rigid cathode with enhanced solid-solution behavior to guide the uniform distribution of ions and electric field. Meanwhile, the polymer components are optimized to build an organic-inorganic blended flexible interfacial film to relieve the change of interfacial stress and ensure rapid ion transmission. The fabricated battery comprising a Co-modulated P2-type layered cathode (Na0.67Mn2/3Co1/3O2) and a high ion conductive polymer could deliver good cycling stability without distinct capacity fading (72.8 mAh g-1 over 350 cycles at 1 C), outperforming those without Co modulation or interfacial film construction. This work demonstrates a promising rigid-flexible coupled interfacial stress modulation strategy for polymer-metal batteries with excellent cycling stability.