2024

ACS Applied Materials & Interfaces

Journal year: 2024 | Journal volume: in press | Journal number: in press

scientific article

english

EN Zn/alkali metal dual-ion batteries (ZM DIBs) with highly concentrated water-in-salt (WiS) electrolytes are promising next-generation energy storage systems. This enhanced design of Zn-ion rechargeable batteries offers intrinsic safety, high operating voltage, satisfactory capacity, and outstanding cyclic stability. However, operating with WiS liquid electrolytes, ZM DIB devices still require suitable separators, which entails consequential problems. Glass-fiber separators, a typical choice for aqueous-based batteries, suffer from electrolyte leakage risk, Zn dendrites piercing, and limited mechanical properties (i.e., robustness and flexibility). Herein, taking the concept of highly concentrated electrolytes one step further, we introduce water-in-salt gel biopolymer electrolytes (WiS-GBEs) by encapsulating Zn/Li or Zn/Na bi salt compositions in the cellulose membrane. WiS-GBEs inherit the electrochemical merits of highly-concentrated electrolytes (i.e., wide voltage window, high ionic conductivity, etc.) and the excellent durability of gel biopolymer structures. Both types of WiS-GBEs apply to coin- and pouch-cell compartments of ZM DIBs, offering a high plateau voltage (> 1.8 V vs. Zn2+/Zn), good and reversible capacity (118 and 57 mAh g−1 for Zn/Li and Zn/Na cells, respectively), and outstanding cycling stability (more than 90 % after 1,000 cycles). Essentially, the pouch cells with WiS-GBEs present superior durability, flexibility, and capacity endurance under various bending stress conditions, indicating their potential capability to power wearable electronics.

27.06.2024

10.1021/acsami.4c04570

https://pubs.acs.org/doi/10.1021/acsami.4c04570

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