期刊
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
卷 15, 期 -, 页码 5849-5863出版社
ELSEVIER
DOI: 10.1016/j.jmrt.2021.11.055
关键词
All-solid-state; Solid polymer electrolytes; Cubic garnet llzo; Lithium-ion battery; Succinonitrile
资金
- Korea Institute of Energy Technology Evaluation and Planning of the Republic of Korea [20184030202130]
- Ministry of Trade, Industry and Energy of the Republic of Korea [20184030202130]
- Soonchunhyang University fund
The study introduces a method to improve the ionic conductivity of solid polymer electrolytes by using SN and Al-LLZO nanoparticles, achieving high ionic conductivity and cycling stability.
Solid polymer electrolytes are promising candidates for implementation in next-generation all-solid-state batteries (ASSBs) which could replace conventional batteries used today. However, the materialization of ASSBs on a mass scale is restricted by the low ionic conductivity and high interfacial resistance of solid electrolytes. In this work, succinonitrile (SN) with lithium (trifluoromethylsulphonyl)imide (LiTFSI) and Al-doped Li7La3Zr2O12 (Al-LLZO) nanoparticles were used to improve the ionic conductivity of a polyethylene oxide-based composite electrolyte. The Al-LLZO nanoparticles were synthesized by a facile synthesis process at low temperatures, which contributed to an enhancement in the ionic conductivity. A solid polymer electrolyte with 7.5 wt% of Al-LLZO and 15 wt% of SN achieved a high ionic conductivity of 4.17 x 10(-4) Scm(-1) at room temperature and a large value of 0.451 for the lithium-ion transport number at 60 degrees C. By adding 10 wt% SN and 10 wt% of Al-LLZO in the LiFePO4 cathode, the cell could operate at 25 degrees C with a specific capacity of 130 mAh g(-1) and 89% capacity retention after 200 cycles at current density of 20 mA g(-1). This study therefore proposes a solution to improve the ionic conductivity of solid polymer electrolytes in all-solid-state batteries. (c) 2021 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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