材料科学
法拉第效率
成核
阳极
电解质
电镀(地质)
锂(药物)
化学工程
精炼(冶金)
冶金
剥离(纤维)
无机化学
电极
复合材料
化学
医学
地质学
工程类
内分泌学
物理化学
有机化学
地球物理学
作者
Jing Dong,Hongliu Dai,Qifeng Fan,Chao Lai,Shanqing Zhang
出处
期刊:Nano Energy
[Elsevier]
日期:2019-09-23
卷期号:66: 104128-104128
被引量:63
标识
DOI:10.1016/j.nanoen.2019.104128
摘要
Lithium (Li) metal is considered as an ideal anode material for energy storage systems mainly due to its large theoretical capacity. However, uncontrolled lithium dendrite growth during Li plating and stripping results in low Coulombic efficiency, poor cycling performance, and potential risk concerns, significantly limiting the commercial application of Li metal anodes. Herein, hexafluoroacetylacetone (HFAA) is used as a novel electrolyte additive to regulate the even deposition of Li ions based on grain refining mechanism. Within the electrolyte, HFAA forms complexes with lithium ions to generate more nucleation sites during plating process, and thus facilitating smooth deposition on the lithium anode surface as grain refiner. As a result, greatly enhanced cycling stability is obtained both in the Li/Li symmetric cell and Li/LiNi0·5Co0·2Mn0·3O2 (Li/NCM) full cell using electrolyte containing HFAA. Especially, after introducing the co-additive of saccharin, prolonged cycle lifetime is observed, as which can act as levelling agent for pristine Li foil. The grain refining strategy advances research in developing efficient and practicable additives for metal Li batteries.
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