Low-Cost Electrolyte Additive Enables an Ultra-stable and Dendrite-Free Zn Anode

作者：Dai, Zhiqiang; Rajendran, Kumuthini; Cao, Jin^*; Zhang, Dongdong; Chanajaree, Rungroj; Yang, Chengwu; Tan, Peng; Zhang, Xinyu^*; Qin, Jiaqian^*

来源：Energy and Fuels, 2023, 37(17): 13536-13545.

DOI：10.1021/acs.energyfuels.3c02557

• CARBON CLOTH
• ZINC
• PERFORMANCE
• STORAGE

With their cost-effectiveness and superior safety features,zinc-ionbatteries (ZIBs) have emerged as highly promising energy storage systems.However, severe Zn dendrites and harmful side reactions exist on theZn surface during cycling, resulting in poor coulombic efficiency(CE) and cycling stability. Herein, the above problems have been solvedby adding sodium gluconate (Ga) additive in a 2 M ZnSO4 (ZSO) electrolyte (ZSO-0.05Ga). On the one hand, the Ga additiveis adsorbed on the surface of the Zn metal anode to form a protectivelayer, which effectively reduces the corrosion reaction and inducesuniform deposition. On the other hand, the strong adsorption capacitybetween Ga and Zn2+ in the electrolyte can change the solvationstructure of Zn2+, thereby effectively inhibiting the generationof side reactions. Thus, a Zn||Zn symmetric battery with a ZSO-0.05Gaelectrolyte can be cycled stably for more than 2700 h at a currentdensity of 1 mA cm(-2); the Zn||Cu half-battery hasan ultrahigh stability of 500 cycles; and the average charge-dischargeefficiency reaches 99.2%. In addition, the Ga additive greatly improvesthe cycle stability of the Zn||AC battery (89.3% after 1000 cyclesat 1 A g(-1)). This electrolyte additive with co-regulationfunctions of the solvation shell and interface adsorption effect providesan idea for improving the stability of the Zn anode for further applicationof ZIBs.

• 单位
  燕山大学