阳极
阴极
法拉第效率
电解质
材料科学
电极
锂(药物)
相间
金属锂
化学工程
电池(电)
纳米技术
复合材料
金属
化学
冶金
功率(物理)
遗传学
生物
物理化学
内分泌学
量子力学
工程类
物理
医学
作者
Zhipeng Wen,Hang Li,Huiyang Li,Haiming Hua,Feng Wang,Yu Gu,Yang Yang,Jinbao Zhao
标识
DOI:10.1016/j.jpowsour.2021.230370
摘要
Unstable solid electrolyte interphase between lithium metal and electrolyte results in low coulombic efficiency and limited cycle life, which hinder the utility of lithium metal anode. Besides, how to settle the cathode material corrosion in practical lithium metal batteries is also a key challenge. Here, lithium 2 trifluoromethyl-4,5-dicyanoimidazolide (C6F3LiN4) is reported as valid electrolyte additive for bi-electrode protective films formation in practical Li metal-based batteries. The C6F3LiN4 plays distinct functions in bi-electrode interface, it attributes to robust F, N-rich polymer interphase layer on the cathode which effectively protect the cathode from deterioration. And it promotes the even distribution of LiF and polycarbonate species on anode and prevent the formation of Li dendrites. The symmetric cell of C6F3LiN4 exhibits stable cycling performance with 1 mA cm−2 (700 h). In addition, the improvement in the Li metal deposition uniformity has been confirmed by atomic force microscope and simulation. Benefiting from the synergistic enhanced stability and uniformity of electrode interphase, the LiNi0.5Co0.2Mn0.3O2 || Li metal battery with C6F3LiN4 can maintain high capacity retention of 82.6% after 400 cycles. Importantly, the Li metal pouch battery pairing high-loading cathode (16.12 mg cm−2) also deliver longer cycle life, validating its feasibility in practical applications.
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