Eliminating Stubborn Insulated Deposition by Coordination Effect to Boost Zn Electrode Reversibility in Aqueous Electrolyte

Frontiers in Chemistry

Haoqing Ji¹  Xinyao Xia¹  Yijun Qian²  Tao Qian³  Jie Liu³  Xuefang Gu³  Shu Tian³  Siyi Qian³  Yuzhuo Jiang³  Pinxin Zhou⁴  Jing Zhang⁴ 

[1] College of Energy, Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou, China;Institute for Frontier Materials, Deakin University, Victoria, China;School of Chemistry and Chemical Engineering, Nantong University, Nantong, China;State Key Laboratory of Space Power-Sources Technology, Shanghai Institute of Space Power-Sources, Shanghai, China;

关键词: aqueous zinc-ion batteries;    electrolyte additive;    coordination effect;    interfacial by-products;    insulating layer;   

DOI  :  10.3389/fchem.2022.851973

来源: DOAJ

【 摘 要 】

Aqueous rechargeable zinc-ion batteries (ZIBs) have recently shined in energy storage and transmission, which are due to high safety and low cost. However, the extremely stubborn by-products in the Zn anode severely inhibited the Zn2+ adsorption/desorption and exacerbated the dendrite formation. Herein, we report a facile strategy to eliminate inert Zn4(OH)6SO4·xH2O for the improvement of ZIBs according to the coordination effect by employing ethylenediaminetetraacetic acid-diamine (EDTA-2Na) as a coordination additive in traditional electrolyte. Zn2+ is coordinated with the carboxyl group of the four acetyl carboxyl groups and the N in C–N bonds, forming a new chelating structure, and thus stubborn deposition will be dissolved in the electrolyte. As a result, the discharge capacity of 102 mAh g−1 in the ZnSO4/Li2SO4 with EDTA-2Na electrolyte at a current density of 4 C and a stable cycle life with a capacity of 90.3% after 150 cycles are achieved. It has been concluded that the coordination effect strategy provides a valuable idea for solving the defects of ZIBs.

【 授权许可】

Unknown