Boosting Cycling Stability of Polymer Sodium Battery by “Rigid-Flexible” Coupled Interfacial Stress Modulation

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 P2type layered cathode (Na 0.67 Mn 2/3 Co 1/3 O 2 ) 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.

Current Progress of Anode‐Free Rechargeable Sodium Metal Batteries: Origin, Challenges, Strategies, and Perspectives

“…[ 31 ] This generates significant internal stress changes, which not only affect the interfacial contact but can also damage the stable structure of the battery under severe conditions. [ 32 ]…”

Interface Engineering for 3D Printed Energy Storage Materials and Devices

“…[62,63] Additionally, since interface properties are in a dynamic state, interface stability is also crucial for stable electrochemical behaviors during long-term charge-discharge cycles. [64,65] In a rechargeable Li-based battery device, which is a typical device studied in interface research, ion migration continuously takes places between the cathode and anode during the charge-discharge operation, along with varying time/potential. At both the bulk volume and internal interface sites of electrodes, faradaic reactions (electrons-induced redox reaction) and nonfaradaic processes (adsorption/desorption) occur, indicating the paramount importance of interface chemistry for internal interaction and electrochemical reactions of electrodes, in particular 3D printed electrodes.…”

“…[ 62,63 ] Additionally, since interface properties are in a dynamic state, interface stability is also crucial for stable electrochemical behaviors during long‐term charge–discharge cycles. [ 64,65 ]…”

Macroscale preparation of CoS2 nanoparticles for ultra-high fast-charging performance in sodium-ion batteries

“…1,2 As a result of limited lithium resources, sodium-ion batteries (NIBs) have emerged as a viable alternative to lithium-ion batteries (LIBs). [3][4][5][6][7] However, the main challenge facing NIBs lies in their ability to operate efficiently and reliably at high current densities, thereby enabling fast-charging technology to address concerns regarding battery range and charging speed. 8,9 The expansion of battery pack capacity enables extended driving distances, but it also results in longer charging durations.…”