期刊
MACROMOLECULES
卷 50, 期 5, 页码 1950-1958出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.6b02404
关键词
-
资金
- MEXT, Japan [24225003, 16K14010]
- Iwatani Naoji Foundation's
- Grants-in-Aid for Scientific Research [16K14010] Funding Source: KAKEN
Redox-active copolymer containing organic robust radical, 2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPO), and charge neutralizing anion, trifluoromethanesulfonylimide (TFSI-) was synthesized as a cathode material of a Li-ion battery. The copolymer, poly(2,2,6,6-tetramethylpiperidin-1-oxy-4-yl methacrylate-co-styrenesulfonyl(trifluoromethanesulfonyl)imide) (1)(TMA-co-TFSI)), was designed to give rise to the Li+ migration during its charge-discharge process, based on the self charge compensation of TEMPO with TFSI- bound to the polymer chain in a widely used electrolyte system for Li-ion battery, organic carbonate mixtures. Copolymerization was performed to achieve efficient self-charge compensation with uniformly distributed TFSI- units. The P(TMA-co-TFSI) layer electrode exhibited reversible redox reaction at 0.73 V vs Ag/AgCl. Electrochemical measurements combined with quartz crystal microbalance analysis evidenced that the redox reaction involved the Li+ migration in binary system of ethylene carbonate and diethyl carbonate. A test cell fabricated with the P(TMA-co-TFSI) cathode exhibited high discharging voltage of 3.7 V and high -rate charge -discharge capability at 30 C (i.e., full charging in 2 min).
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