2023-06-28 アルゴンヌ国立研究所(ANL)
◆繰り返しの充放電でも高い性能を維持できるため、電気自動車や他の高性能電池システムに広く活用される可能性があります。また、この新しい電解質は低コストで環境にも優しく、安全性も高いです。
＜関連情報＞
- https://www.anl.gov/article/an-ingredient-in-toothpaste-may-make-electric-cars-go-farther
- https://www.nature.com/articles/s41467-023-38229-7
フッ素化カチオンが高電圧リチウム金属電池を可能にする新しい相間化学反応を導入 A fluorinated cation introduces new interphasial chemistries to enable high-voltage lithium metal batteries
Qian Liu,Wei Jiang,Jiayi Xu,Yaobin Xu,Zhenzhen Yang,Dong-Joo Yoo,Krzysztof Z. Pupek,Chongmin Wang,Cong Liu,Kang Xu & Zhengcheng Zhang
Nature Communications Published:21 June 2023
DOI:https://doi.org/10.1038/s41467-023-38229-7
Abstract
Fluorides have been identified as a key ingredient in interphases supporting aggressive battery chemistries. While the precursor for these fluorides must be pre-stored in electrolyte components and only delivered at extreme potentials, the chemical source of fluorine so far has been confined to either negatively-charge anions or fluorinated molecules, whose presence in the inner-Helmholtz layer of electrodes, and consequently their contribution to the interphasial chemistry, is restricted. To pre-store fluorine source on positive-charged species, here we show a cation that carries fluorine in its structure is synthesized and its contribution to interphasial chemistry is explored for the very first time. An electrolyte carrying fluorine in both cation and anion brings unprecedented interphasial chemistries that translate into superior battery performance of a lithium-metal battery, including high Coulombic efficiency of up to 99.98%, and Li0-dendrite prevention for 900 hours. The significance of this fluorinated cation undoubtedly extends to other advanced battery systems beyond lithium, all of which universally require kinetic protection of highly fluorinated interphases.
