储能科学与技术2025，Vol.14Issue(5)：1829-1840,12.DOI:10.19799/j.cnki.2095-4239.2024.1125
锂金属电池充放电过程中锂枝晶生长与溶解的相场模拟研究
Phase-field simulation study on the growth and dissolution of lithium dendrites during the charging and discharging processes of lithium metal batteries
摘要
Abstract
The potential of lithium metal batteries(LMBs)in high-energy-density applications such as electric vehicles,portable electronic devices,and other fields has become widely recognized.However,the cycling performance and safety of LMBs are degraded by uncontrolled growth of lithium dendrites and the formation of dead lithium during the charging and discharging processes.This paper establishes a multi-physics simulation model based on the phase-field method,which simulates the growth and dissolution of lithium dendrites.The effects of charging and discharging voltage,cycle number,and temperature on the dendrite morphology and dead lithium formation were systematically investigated.It was found that lithium dendrites begin growing during charging and dissolve during discharging.Dissolution begins at the trunk and root of the dendrite,leading to necking in narrow regions and eventual detachment from the electrode,forming dead lithium.The lithium deposition(dissolution)rates increase(decrease)with charging(discharging)time.Overall,the dissolution rate exceeds the deposition rate.Increasing the charging voltage increases the dendrite deposition rate and the morphological complexity,whereas increasing the discharging voltage increases the dendrite dissolution rate and the dead lithium formation.Increasing the number of cycles slows the dendrite growth but enhances the accumulation of dead lithium.Elevated temperatures suppress dendrite growth,promote lithium dissolution,and reduce dead lithium formation.This research provides valuable insights for enhancing the cycling performance and safety of LMBs.关键词
锂金属电池/充放电/锂枝晶/死锂/相场模拟Key words
lithium metal battery/charging and discharging/lithium dendrites/dead lithium/phase-field simulation分类
动力与电气工程引用本文复制引用
梁辰,邢鹏飞,吴孟武,秦训鹏..锂金属电池充放电过程中锂枝晶生长与溶解的相场模拟研究[J].储能科学与技术,2025,14(5):1829-1840,12.基金项目
湖北省技术创新计划项目(2024BAB072),智能农业动力装备全国重点实验室开放课题资助项目(SKLIAPE2023014). （2024BAB072）
