Elongating the cycle life of lithium metal batteries in carbonate electrolyte with gradient solid electrolyte interphase layer

被引:66
|
作者
Lu, Wei [1 ]
Sun, Liqun [1 ]
Zhao, Yang [2 ]
Wu, Tong [1 ]
Cong, Lina [1 ]
Liu, Jia [1 ]
Liu, Yulong [1 ]
Xie, Haiming [1 ]
机构
[1] Northeast Normal Univ Changchun, Dept Chem, Natl & Local United Engn Lab Power Battery, Changchun 130024, Peoples R China
[2] Univ Western Ontario, Dept Mech & Mat Engn, London, ON N6A 5B9, Canada
基金
中国国家自然科学基金; 国家重点研发计划;
关键词
Lithium metal battery; Lithium metal anode; Solid electrolyte interphase; Polymer-inorganic; Stable cycling; ANODE; GRAPHITE; LIQUID; DEPOSITION; INTERFACE;
D O I
10.1016/j.ensm.2020.09.017
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Artificial solid electrolyte interphase (SEI) protective layer has been widely applied to protect lithium (Li) metal anode. However, few attentions have been paid to interface contact between artificial SEI and Li metal. Here, we develop a polymer-inorganic gradient SEI (PIG-SEI) layer on Li, which consists of the outer polymer rich layer of PEGDA-co-VC and inner inorganic nanoparticles rich layer of LiF, Li3N and Cu. The PIG-SEI protected Li metal anode can not only improve interface contact between PIG-SEI layer and Li metal and the Li-ion conductivity of SEI layer but also increase the flexibility and mechanical strength. As a result, the PIG-SEI protected Li metal anode enable Li parallel to Li symmetric cells to maintain a stable overpotential of 20 mV at a capacity of 2 mAh cm(-2) over 2500 h, and enable Li parallel to LiFePO4 and Li parallel to LiNi0.8Co0.1Mn0.1O2 cell to capacity of 122 mAh g(-1) and 123 mAh g(-1) at 0.5 degrees C for 500 cycles under lean carbon-ate-based electrolyte (Li parallel to Li: 5.0 mu L mAh(-1), Li parallel to LiFePO4 : 14.3 mu L mAh(-1), Li parallel to LiNi0.8Co0.1Mn0.1O2 : 14.4 mu L mAh(-1)). It is believed that our gradient-layer protected Li metal anode opens up new idea for the practical applications of next-generation high-energy-density Li metal batteries.
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页码:241 / 249
页数:9
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