期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 27, 页码 31583-31593出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c04637
关键词
polymer-in-salt electrolyte; lithium metal battery; polyethylene oxide electrolyte; high voltage stability; lithium metal anode
资金
- Assistant Secretary for the Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Office of the U.S. Department of Energy (DOE), through the Advanced Battery Materials Research (BMR) program [DE-AC05-76RL01830]
- DOE's Office of Biological and Environmental Research
- Department of Energy [DE-AC0576RL01830]
The newly developed polymer-in-salt electrolyte (PISE) provides a method to improve the oxidative stability of lithium metal polymer batteries (LMPBs) while maintaining high charge capacity. The solid-state PISEs prepared with a special process exhibit excellent performance, offering a promising pathway towards high-voltage stable LMPBs.
The lithium (Li) metal polymer battery (LMPB) is a promising candidate for solid-state batteries with high safety. However, high voltage stability of such a battery has been hindered by the use of polyethylene oxide (PEO), which oxidizes at a potential lower than 4 V versus Li. Herein, we adopt the polymerin-salt electrolyte (PISE) strategy to circumvent the disadvantage of the PEO-lithium bis(fluorosulfonyl)imide (LiFSI) system with EO/Li <= 8 through a dry ball-milling process to avoid the contamination of the residual solvent. The obtained solid-state PISEs exhibit distinctly different morphologies and coordination structures which lead to significant improvement in oxidative stability. P(EO)(1)LiFSI has a low melting temperature, a high ionic conductivity at 60 degrees C, and an oxidative stability of similar to 4.5 V versus Li/Li+. With an effective interphase rich in inorganic species and a good stability of the hybrid polymer electrolyte toward Li metal, the LMPB constructed with Li parallel to LiNi1/3Co1/3Mn1/3O2 can retain 74.4% of capacity after 186 cycles at 60 degrees C under the cutoff charge voltage of 4.3 V. The findings offer a promising pathway toward high-voltage stable polymer electrolytes for high-energy-density and safe LMPBs.
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