摘要
由于锌-空气电池拥有较高的理论能量密度(1086 W·h/kg)以及阳极活性物质锌具有丰富易得、成本低等优点而成为广受关注的二次电池。但锌-空气电池的锌阳极还存在枝晶生长、形变、析氢自腐蚀等问题,特别是锌枝晶生长对锌-空气电池的循环寿命影响较大。本文首先基于电化学相场理论建立锌-空气电池枝晶生长模型,并应用模型研究充电时间、各向异性强度及电解液温度对锌枝晶形貌和生长高度的影响规律。最后设计了提升电解液温度、流动电解液、脉冲充电等实验来验证理论模拟。结果表明:锌枝晶的生长主要受扩散和传质过程控制,抑制锌枝晶生长的最佳电解液温度为343.15 K,最佳电解液流速为40mL/min,最佳脉冲充电方式为静置5 s、正向脉冲10 s、静置5 s、反向脉冲10 s。
Zinc-air batteries have been widely used in the research of secondary batteries due to their high theoretical energy density(1086 W·h/kg) and the abundant availability and low cost of the anode active material zinc.However,there are some problems in the zinc anode of the Zn-air battery such as dendrite growth,deformation and self-corrosion of hydrogen evolution.In particular,the dendrite growth has a great influence on the cycle life of the Zn-air battery.In this paper,a dendrite growth model of the Zn-air battery was firstly established by electrochemical phase field,and the effects of charging time,anisotropic strength and electrolyte temperature on the morphology and growth height of the zinc dendrite were then studied by the model.Finally,experiments such as raising the electrolyte temperature,flowing electrolyte and pulse charging were designed to verify the theoretical simulation.The results show that the growth of the zinc dendrite is mainly controlled by the diffusion and mass transfer processes.The optimal electrolyte temperature for inhibiting the growth of the zinc dendrite is 343.15 K and the optimal electrolyte flow rate is 40 mL/min.Besides,the optimal pulse charging mode is stand still for 5 s,forward pulse for 10 s,stand still for 5 s,reverse pulse for 10 s.
作者
尤祥
何翠萍
陈远亮
王建国
杨妮
田林
谢刚
侯彦青
YOU Xiang;HE Cui-ping;CHEN Yuan-liang;WANG Jian-guo;YANG Ni;TIAN Lin;XIE Gang;HOU Yan-qing(State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization,Kunming University of Science and Technology,Kunming 650093,China;Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China;Department of Science,Technology and Information Technology,China Copper Co.,Ltd.,Kunming 650051,China;Institute of Metallurgical Reserach,Kunming Metallurgical Research Institute Co.,Ltd.,Kunming 650031,China)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2023年第5期1625-1635,共11页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(22168019,52074141)。
关键词
锌-空气电池
锌枝晶
模拟枝晶生长
抑制枝晶生长
zinc-air battery
zinc dendrite
simulated dendrite growth
inhibit dendrite growth
