1. Cubic garnet solid polymer electrolyte for room temperature operable all-solid-state-battery
- Author
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Soon-Ki Jeong, Younghyun Cho, Quoc Hung Nguyen, Van Tung Luu, Moon Gyu Park, Hoang Long Nguyen, Young-Woo Lee, Yun-Seok Jun, Wook Ahn, Namchul Cho, Sung Nam Lim, and Min Ho Seo
- Subjects
Battery (electricity) ,Materials science ,chemistry.chemical_element ,Electrolyte ,law.invention ,Biomaterials ,chemistry.chemical_compound ,law ,Lithium-ion battery ,Succinonitrile ,Fast ion conductor ,Ionic conductivity ,chemistry.chemical_classification ,Mining engineering. Metallurgy ,Cubic garnet llzo ,TN1-997 ,Metals and Alloys ,Polymer ,Cathode ,Surfaces, Coatings and Films ,All-solid-state ,chemistry ,Chemical engineering ,Ceramics and Composites ,Solid polymer electrolytes ,Lithium - Abstract
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 × 10-4 Scm-1 at room temperature and a large value of 0.451 for the lithium-ion transport number at 60 °C. By adding 10 wt% SN and 10 wt% of Al-LLZO in the LiFePO4 cathode, the cell could operate at 25 oC 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.
- Published
- 2021