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タイトル: | Superconcentrated electrolytes for a high-voltage lithium-ion battery |
著者: | Wang, Jianhui Yamada, Yuki Sodeyama, Keitaro Chiang, Ching Hua Tateyama, Yoshitaka Yamada, Atsuo |
著者名の別形: | 山田, 裕貴 袖山, 慶太郎 館山, 佳尚 山田, 淳夫 |
キーワード: | Batteries Chemical physics |
発行日: | 29-Jun-2016 |
出版者: | Springer Nature |
誌名: | Nature Communications |
巻: | 7 |
論文番号: | 12032 |
抄録: | Finding a viable electrolyte for next-generation 5 V-class lithium-ion batteries is of primary importance. A long-standing obstacle has been metal-ion dissolution at high voltages. The LiPF[6] salt in conventional electrolytes is chemically unstable, which accelerates transition metal dissolution of the electrode material, yet beneficially suppresses oxidative dissolution of the aluminium current collector; replacing LiPF[6] with more stable lithium salts may diminish transition metal dissolution but unfortunately encounters severe aluminium oxidation. Here we report an electrolyte design that can solve this dilemma. By mixing a stable lithium salt LiN(SO[2]F)[2] with dimethyl carbonate solvent at extremely high concentrations, we obtain an unusual liquid showing a three-dimensional network of anions and solvent molecules that coordinate strongly to Li[+] ions. This simple formulation of superconcentrated LiN(SO[2]F)[2]/dimethyl carbonate electrolyte inhibits the dissolution of both aluminium and transition metal at around 5 V, and realizes a high-voltage LiNi[0.5]Mn[1.5]O[4]/graphite battery that exhibits excellent cycling durability, high rate capability and enhanced safety. |
著作権等: | This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. |
URI: | http://hdl.handle.net/2433/226836 |
DOI(出版社版): | 10.1038/ncomms12032 |
PubMed ID: | 27354162 |
出現コレクション: | 学術雑誌掲載論文等 |
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