以聚丙烯酰胺为电解液添加剂稳定金属锌负极  

Stabilization of Zinc Metal Anodes with Polyacrylamide as an Electrolyte Additive

作　　者：李雪艳 张蒙茜 裴文乐 李莎莎 李鹏[1] LI Xueyan;ZHANG Mengxi;PEI Wenle;LI Shasha;LI Peng(School of Chemical Engineering and Technology,Taiyuan University of Science and Technology,Taiyuan 030024,China;Engineering Research Center of Heavy Machinery of Ministry of Education,Taiyuan University of Science and Technology,Taiyuan 030024,China)

机构地区：[1]太原科技大学化学工程与技术学院,太原030024 [2]太原科技大学重型机械教育部工程研究中心,太原030024

出　　处：《材料导报》2024年第15期249-253,共5页Materials Reports

基　　金：山西省基础研究计划青年项目(202303021212214,202203021212301,202203021212316);山西省高等学校科技创新项目(2022L322,2022L273,2022L309);来晋工作优秀博士奖励资金项目(20222095,20222097);太原科技大学博士科研启动基金(20222027,20222030)。

摘　　要：水系锌离子电池因具有成本低廉和安全性高等优点而被认为是极具前景的储能体系。金属锌因具备高的理论体积比容量和较低的氧化还原电位,可以直接用作水系锌离子电池负极,但金属锌负极存在自腐蚀和锌枝晶生长等问题,导致电池循环寿命缩短,严重制约了其实际应用。本工作设计了一种聚丙烯酰胺(PAM)聚合物作为锌离子电池的电解液添加剂,结果显示在2 g/L PAM添加剂电解液体系中电池表现出最优的循环性能,在5 mA/cm^(2)、1 mAh/cm^(2)时锌-锌对称电池能稳定循环2800 h,进一步的电化学测试和扫描电子显微镜表征证明PAM添加剂能够很好地抑制金属锌枝晶和减轻锌电极腐蚀。该工作为通过功能性电解质添加剂设计高性能的水系电解液添加剂提供了一种新思路。Aqueous zinc-ion batteries are considered as a promising energy storage system due to their low cost and high safety.The zinc metal can be directly used as the anode of aqueous zinc ion batteries because of its high theoretical volume-specific capacity and low redox potential.However,the zinc metal anode has problems such as self-corrosion and zinc dendrite growth,which seriously shorten the battery cycle life and restricts its practical application.In this work,a polymer polyacrylamide(PAM)was designed as an electrolyte additive for zinc ion batteries,and it was found that the batteries showed the optimal cycling performance in the electrolyte system with 2 g/L PAM,and the zinc symmetric batteries remains steady after 2800 h at 5 mA/cm^(2) and 1 mAh/cm^(2).Further electrochemical tests and SEM characterization demonstrated that the PAM additive was able to inhibit metallic zinc dendrites and mitigate zinc electrode corrosion.This work provides a new idea for designing high-performance of aqueous electrolyte additives through functional electrolyte additives.

关 键 词：锌负极 聚丙烯酰胺 锌枝晶 聚合物添加剂 

分 类 号：O646.6[理学—物理化学]