Jie Yulin, Liu Xiaojing, Lei Zhanwu, Wang Shiyang, Chen Yawei, Huang Fanyang, Cao Ruiguo, Zhang Genqiang, Jiao Shuhong
Hefei National Laboratory for Physical Science at the Microscale, CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China, Hefei, 230026, P.R. China.
Institute of Molecular Sciences and Engineering, Shandong University, Qingdao, 266237, P.R. China.
Angew Chem Int Ed Engl. 2020 Feb 24;59(9):3505-3510. doi: 10.1002/anie.201914250. Epub 2020 Jan 21.
Lithium metal is an ideal electrode material for future rechargeable lithium metal batteries. However, the widespread deployment of metallic lithium anode is significantly hindered by its dendritic growth and low Coulombic efficiency, especially in ester solvents. Herein, by rationally manipulating the electrolyte solvation structure with a high donor number solvent, enhancement of the solubility of lithium nitrate in an ester-based electrolyte is successfully demonstrated, which enables high-voltage lithium metal batteries. Remarkably, the electrolyte with a high concentration of LiNO additive presents an excellent Coulombic efficiency up to 98.8 % during stable galvanostatic lithium plating/stripping cycles. A full-cell lithium metal battery with a lithium nickel manganese cobalt oxide cathode exhibits a stable cycling performance showing limited capacity decay. This approach provides an effective electrolyte manipulation strategy to develop high-voltage lithium metal batteries.
锂金属是未来可充电锂金属电池的理想电极材料。然而，金属锂负极的广泛应用受到其枝晶生长和低库仑效率的显著阻碍，尤其是在酯类溶剂中。在此，通过用高给体数溶剂合理调控电解质溶剂化结构，成功证明了硝酸锂在酯基电解质中的溶解度得到提高，这使得高压锂金属电池成为可能。值得注意的是，含有高浓度LiNO添加剂的电解质在稳定的恒电流锂电镀/剥离循环中表现出高达98.8%的优异库仑效率。具有锂镍锰钴氧化物阴极的全电池锂金属电池表现出稳定的循环性能，容量衰减有限。该方法为开发高压锂金属电池提供了一种有效的电解质调控策略。
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