阳极
材料科学
电解质
剥离(纤维)
自行车
电池(电)
金属
碳酸盐
泄流深度
电极
冶金
复合材料
化学
热力学
功率(物理)
考古
物理化学
物理
历史
作者
Haodong Liu,John Holoubek,Hongyao Zhou,Zhaohui Wu,Xing Xing,Sicen Yu,Gabriel M. Veith,Yejing Li,Hui Meng,Younghoon Choi
标识
DOI:10.1016/j.ensm.2020.12.032
摘要
Pit corrosion of Li during stripping is an important factor responsible for poor Li cycling efficiency, a metric that determines its cycling life. When excess Li is present, it has been observed that Li tends to strip in a non-uniform fashion, forming pits that extend well past the theoretical Li depth that inevitably lead to the formation of electronically isolated “dead” Li particles. In this work, a novel cell with replenishable Li is shown to inherently mitigate the formation of this “dead” Li, as a direct result of a design in which the intrinsically more homogenous stripping behavior of anode-free cells are combined with a replenishable limited Li reservoir. These novel cells (Li|Cu||LiFePO4) exhibit 25% and 34% higher cumulative capacities than the conventional cells (Cu|Li||LiFePO4) in carbonate and ether electrolytes, respectively, enabling a significant increase in cycle life without impacting energy density. This improvement strategy represents a new direction in Li metal battery improvement, in which improved cycling can be achieved regardless of electrolyte chemistry.
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