Boosting Cycling Stability of Polymer Sodium Battery by "Rigid-Flexible" Coupled Interfacial Stress Modulation.
basic_science · Level V
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- Record sourced from PubMed, PMID 36847547.
- Also identified by DOI 10.1021/acs.nanolett.2c04854.
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Abstract
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 (Na<sub>0.67</sub>Mn<sub>2/3</sub>Co<sub>1/3</sub>O<sub>2</sub>) and a high ion conductive polymer could deliver good cycling stability without distinct capacity fading (72.8 mAh g<sup>-1</sup> 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.