Dong Haobo, Li Jianwei, Zhao Siyu, Jiao Yiding, Chen Jintao, Tan Yeshu, Brett Dan J L, He Guanjie, Parkin Ivan P
Christopher Ingold Laboratory, Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K.
Electrochemical Innovation Lab, Department of Chemical Engineering, University College London, 20 Gordon Street, London WC1H 0AJ, U.K.
ACS Appl Mater Interfaces. 2021 Jan 13;13(1):745-754. doi: 10.1021/acsami.0c20388. Epub 2020 Dec 28.
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-NaMnO·1.31HO 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 at 0.1 A g, 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. A detailed investigation combining experiments uncovers the charge storage mechanism and the stability of assembled batteries, confirming the reversible diffusions of both Zn 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 at 1 A g, which illustrates their potential for wearable electronics in mass production.
水系锌离子电池（AZIBs）因其高能量密度和成本效益特性，有潜力应用于电网规模的储能系统。然而，正极材料的溶解以及电极材料中预嵌入金属离子的不可逆提取限制了水系锌离子电池的稳定性。在此，报道了一种基于天然生物质聚合物海藻酸钠作为电解质与预嵌入钠的δ-NaMnO₂·1.31H₂O正极耦合的正极稳定型水系锌离子电池策略。凝胶化后海藻酸盐中解离出的钠通过防止充电过程中层状结构的坍塌直接稳定正极。所制备的水系锌离子电池在0.1 A g时具有305 mA h g的高容量，比使用水电解质的水系锌离子电池高10%。此外，混合聚合物电解质在2 A g下1000次循环内具有高于99%的优异库仑效率和96%的容量保持率。结合实验的详细研究揭示了组装电池的电荷存储机制和稳定性，证实了锌和预嵌入钠的可逆扩散。基于真空辅助树脂传递模塑制造的柔性水系锌离子电池器件在1 A g时具有160 mA h g的出色性能，这说明了其在大规模生产可穿戴电子产品方面的潜力。
