Investigation of a Biomass Hydrogel Electrolyte Naturally Stabilizing Cathodes for Zinc-Ion Batteries

Dong, Haobo, Li, Jianwei, Zhao, Siyu , Jiao, Yiding, Chen, Jintao, Tan, Yeshu, Brett, Dan J. L., He, Guanjie and Parkin, Ivan P. (2021) Investigation of a Biomass Hydrogel Electrolyte Naturally Stabilizing Cathodes for Zinc-Ion Batteries. ACS Applied Materials & Interfaces, 13 (1). pp. 745-754. ISSN 1944-8244

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Aqueous zinc-ion batteries (AZIBs) have the potential to be utilized in a grid-scale energy storage system owing to their high energy density and cost-effective properties. However, the dissolution of cathode materials and the irreversible extraction of preintercalated metal ions in the electrode materials restrict the stability of AZIBs. Herein, a cathode-stabilized ZIB strategy is reported based on a natural biomass polymer sodium alginate as the electrolyte coupling with a Na+ preintercalated δ-Na0.65Mn2O4·1.31H2O cathode. The dissociated Na+ in alginate after gelation directly stabilizes the cathodes by preventing the collapse of layered structures during charge processes. The as-fabricated ZIBs deliver a high capacity of 305 mA h g–1 at 0.1 A g–1, 10% higher than the ZIBs with an aqueous electrolyte. Further, the hybrid polymer electrolyte possessed an excellent Coulombic efficiency above 99% and a capacity retention of 96% within 1000 cycles at 2 A g–1. A detailed investigation combining ex situ experiments uncovers the charge storage mechanism and the stability of assembled batteries, confirming the reversible diffusions of both Zn2+ and preintercalated Na+. A flexible device of ZIBs fabricated based on vacuum-assisted resin transfer molding possesses an outstanding performance of 160 mA h g–1 at 1 A g–1, which illustrates their potential for wearable electronics in mass production.

Keywords:zinc-ion batteries, flexible devices, hydrogel elecrolytes, cathode-stabilized electrolyte, biomass materials
Subjects:F Physical Sciences > F200 Materials Science
Divisions:College of Science > School of Chemistry
ID Code:46096
Deposited On:19 Aug 2021 15:40

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