Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 610, Issue -, Pages 643-652Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.11.106
Keywords
Micropore carbon; Heteroatom doping; Electrolyte; Lithium-selenium batteries
Categories
Funding
- National Natural Science Foundation of China [22075288]
- Guangzhou Science and Technology Plan Project [202102020323]
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NS-K-PC, designed as a Se host, demonstrates excellent performance in the cathode, including high reversible capacity, superior rate capacity, and great cycling stability.
Selenium cathode attracts great attention due to its high theoretical volumetric capacity and better electrical conductivity than sulfur cathode. Herein, N/S co-doped microporous carbon (NS-K-PC) is designed and prepared as Se host by a spray drying process of the poly(styrenesulfonic acid)-melamine salt solution followed by carbonization and activation process. The as-prepared NS-K-PC shows a very high micropore contribution of 94.8% in the total surface area, and a total N/S heteroatom doping level of 2.5 wt% in the carbon matrix. The NS-K-PC/Se cathode delivers a high reversible capacity of 499.2 mA h g(-1) at 0.1C, superior rate capacity of 324 mA h g(-1) at 8C, and great cycling stability with a capacity decay of 0.081% per cycle over 500 cycles at 1C. Additionally, a comparative study demonstrates that NS-K-PC/Se cathode with the carbonate-based electrolytes exhibit better cycling stability than those with ether-based electrolytes primarily resulted from a direct solid-solid conversion of Se to Li2Se bypassing the formation of soluble polyselenides. (C) 2021 Elsevier Inc. All rights reserved.
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