Interfacial engineering for stabilizing polymer electrolytes with 4V cathodes in lithium metal batteries at elevated temperature

Li, Zeyuan; Li, Aijun; Zhang, Hanrui; Lin, Ruoqian; Jin, Tianwei; Cheng, Qian; Xiao, Xianghui; Lee, Wah-Keat; Ge, Mingyuan; Zhang, Haijun; Zangiabadi, Amirali; Waluyo, Iradwikanari; Hunt, Adrian; Zhai, Haowei; Borovilas, James Joseph; Wang, Peiyu; Yang, Xiao-Qing; Chuan, Xiuyun; Yang, Yuan

doi:10.1016/j.nanoen.2020.104655

DOE OSTI · 1617293

Interfacial engineering for stabilizing polymer electrolytes with 4V cathodes in lithium metal batteries at elevated temperature

Li, Zeyuan·Li, Aijun·Zhang, Hanrui·Lin, Ruoqian·Jin, Tianwei·Cheng, Qian·Xiao, Xianghui·Lee, Wah-Keat·Ge, Mingyuan·Zhang, Haijun·Zangiabadi, Amirali·Waluyo, Iradwikanari·Hunt, Adrian·Zhai, Haowei·Borovilas, James Joseph·Wang, Peiyu·Yang, Xiao-Qing·Chuan, Xiuyun·Yang, Yuan

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Abstract

Poly (ethylene oxide) (PEO) polymer electrolytes are promising candidates for next-generation rechargeable lithium batteries. However, the poor interfacial stability between 4 V cathodes and PEO electrolytes impedes their applications in 4 V lithium batteries with high energy density. Here, we demonstrate a facile and effective strategy to enhance the interfacial stability by the synergy of Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 (LAGP) coating on the cathode surface, and salt combination in the electrolyte, even with a cut-off voltage of 4.25–4.4 V vs. Li + /Li. Nano-LAGP coated Li|PEO|LiCoO 2 cell delivers stable cycling with a capacity retention of 81.9%/400 cycles and 84.7%/200 cycles at 60 °C when charged to 4.25 and 4.3 V in pure polyether electrolyte, respectively. Steady cycling is also demonstrated at room temperature and with LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM523) cathode. This work offers a viable and scalable approach to improve the stability between PEO electrolytes and 4 V cathodes and open up new possibilities for practical application of 4 V lithium metal batteries.

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25 ENERGY STORAGE Energy density High-voltage cathode Lithium metal batteries Poly (ethylene oxide)Surface passivation

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Li, Zeyuan, Li, Aijun, Zhang, Hanrui, Lin, Ruoqian, Jin, Tianwei, Cheng, Qian, Xiao, Xianghui, Lee, Wah-Keat, Ge, Mingyuan, Zhang, Haijun, Zangiabadi, Amirali, Waluyo, Iradwikanari, Hunt, Adrian, Zhai, Haowei, Borovilas, James Joseph, Wang, Peiyu, Yang, Xiao-Qing, Chuan, Xiuyun, Yang, Yuan. 2020-03-05. Interfacial engineering for stabilizing polymer electrolytes with 4V cathodes in lithium metal batteries at elevated temperature. https://doi.org/10.1016/j.nanoen.2020.104655

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