期刊
NANO LETTERS
卷 15, 期 9, 页码 5982-5987出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b02116
关键词
Li-iodine batteries; nanoporous carbon; adsorption; binder-free; electrolyte additives
类别
资金
- Programs of National 973 [2011CB935900]
- NSFC [51231003, 21322101]
- MOE [B12015, 113016A]
Rechargeable Li-iodine batteries are attractive electrochemical energy storage systems because iodine cathode provides the possibility of high energy density, wide abundance and low cost. However, the safety risk caused by low thermostability of iodine and the self-discharge reaction due to high solvency of iodine in aprotic solvent are target issues to be considered. Herein, we designed a room-temperature solution-adsorption method to prepare a thermostable iodine carbon cathode by utilizing the strong adsorption of nanoporous carbon. Meanwhile, Li-iodine batteries constructed by the as-prepared cathode and ether-based electrolyte with the addition of LiNO3 showed negligible self-discharge reaction, high rate and long cycling performance. The reversible reactions of I-2/LiI3 and LiI3/LiI in Li-iodine batteries were also proved with in situ Raman measurement. For the demonstration of application, soft-package batteries with Al-plastic film were assembled, displaying energy densities of 475 Wh/kg by mass of Li and iodine, and 136 Wh/kg by total mass of the battery. The use of nanoporous carbon to adsorb iodine at room-temperature represents a new and promising direction for realizing high-performance cathode for rechargeable Li-iodine batteries.
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