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- Title
Rechargeable organic batteries using chloro-substituted naphthazarin derivatives as positive electrode materials.
- Authors
Yao, Masaru; Umetani, Shinji; Ando, Hisanori; Kiyobayashi, Tetsu; Takeichi, Nobuhiko; Kondo, Ryota; Takeshita, Hiroyuki
- Abstract
The use of redox active organic compounds as an alternative positive electrode material of rechargeable lithium batteries can be a solution for the resource issues of the current battery system. To satisfy both the high capacity and long cycle life of the batteries using organic active materials, naphthazarin (5,8-dihydroxy-1,4-naphthoquinone) derivatives, which potentially exhibit a four-electron transfer redox reaction, were investigated. While the unsubstituted naphthazarin lithium salt ( 1), having a high theoretical capacity of up to about 550 mAh g, showed only half the expected capacity and a short cycle life as a positive electrode active material, the chloro-substituted ones ( 1- Cl , 1- Cl ) exhibited improved properties in both their initial capacity utilization and cycle life. In addition, the high stability of a chloro-substituted naphthazarin salt ( 1- Cl ) was supported by a reversible electrochromic behavior during the redox reaction. The substituent effect of the naphthazarin derivatives on the cycle stability was discussed with respect to the battery performance and electrochromic behavior. Also, a guide for designing a new organic active material which shows a high capacity and long cycle life is suggested.
- Subjects
OXIDATION-reduction reaction; ORGANIC compounds; ELECTRODES; STORAGE batteries; LITHIUM-ion batteries; NAPHTHAZARIN
- Publication
Journal of Materials Science, 2017, Vol 52, Issue 20, p12401
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-017-1368-z