Cycle Performance of Lithium-Ion Batteries Containing Ionic Liquids with Improved Reduction Stability

Autor:	Tamae Moriwaka, Junpei Momo, Minoru Takahashi, Rie Yokoi, Hiroshi Kadoma, Hiroto Inoue, Kyosuke Ito, Shunpei Yamazaki, Kenryo Nanba, Toru Itakura, Jun Ishikawa
Rok vydání:	2013
Předmět:	chemistry.chemical_compound Chemistry Quaternary ammonium cation Ionic liquid Linear sweep voltammetry Inorganic chemistry chemistry.chemical_element Lithium Electrolyte Decane Electrochemistry Methyl group
Zdroj:	ECS Transactions. 50:329-338
ISSN:	1938-6737 1938-5862
DOI:	10.1149/05026.0329ecst
Popis:	The high-temperature cycling performance of lithium-ion batteries containing a new series of ionic liquids based on an aliphatic quaternary ammonium cation and a bis(fluorosulfonyl)amide anion were investigated, by conducting charge-discharge cycling tests of graphite / LiFePO4 cells. The new series of ionic liquids were 1,3-dimethyl-1-propylpiperidinium bis(fluorosulfonyl)amide (3mPP13-FSA) and 7-methyl-5-azoniaspiro[4,5]decane bis(fluorosulfonyl)amide (7mAS45-FSA), which were obtained by introducing methyl groups to known compounds. The relationship between a change in electronic structure and reduction stability was researched. Introducing methyl group improved reduction stability as electron-donating ability. Further, melting points were lowered owing to the asymmetric structures of the cations. The electrochemical properties of these ionic liquids were evaluated by linear sweep voltammetry. The cycle performance of graphite/LiFePO4 cells containing these ionic liquids for the electrolytes was improved compared with that of cells containing organic electrolytes based on LiPF6/ECDEC, and the capacity retention ratios were more than 50% at the 500th cycle at 60°C.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a3233d619839b28a74ffccb7bc35af0d https://doi.org/10.1149/05026.0329ecst Zobrazit plný text záznamu