N/S Co-doped microporous carbon derived from PSSH-Melamine salt solution as cathode host for Lithium-Selenium batteries

Qi Xia; Jinlong Hu; Qingqing Chen; Lingzhi Zhang

doi:10.1016/j.jcis.2021.11.106

N/S Co-doped microporous carbon derived from PSSH-Melamine salt solution as cathode host for Lithium-Selenium batteries

J Colloid Interface Sci. 2022 Mar 15:610:643-652. doi: 10.1016/j.jcis.2021.11.106. Epub 2021 Nov 24.

Authors

Qi Xia¹, Jinlong Hu², Qingqing Chen¹, Lingzhi Zhang³

Affiliations

¹ CAS Key Laboratory of Renewable Energy, Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, Guangdong 510640, China; University of Chinese Academy of Sciences, Beijing 100049, China.
² CAS Key Laboratory of Renewable Energy, Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, Guangdong 510640, China.
³ CAS Key Laboratory of Renewable Energy, Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, Guangdong 510640, China. Electronic address: lzzhang@ms.giec.ac.cn.

PMID: 34863554
DOI: 10.1016/j.jcis.2021.11.106

Abstract

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.

Keywords: Electrolyte; Heteroatom doping; Lithium-selenium batteries; Micropore carbon.