Green and universal sulfur doping technique coupled with construction of conductive network for enhanced kinetics of Li-ion capacitors

• Published in: Chemical engineering science 2022-08, Vol.258, p.117749, Article 117749
• Main Authors: Zhao, Lu, Sun, Dong, Cao, Qi, Xiao, Zhihua, Yu, Zhiqing, Qi, Chuanlei, Li, Xingxun, Ning, Guoqing, Ma, Xinlong, Peng, Chong, Gao, Jinsen, Huang, Xiaoqiao
• Format: Article
• Language: English
• Subjects: Conductive network; Enhanced kinetics; Excellent universality; Li-ion capacitor; S doping technique
• ISSN: 0009-2509; 1873-4405
• DOI: 10.1016/j.ces.2022.117749

[Display omitted] •SCNTs and SPC are both prepared via a green, universal, low-cost and integral S doping technique.•SCNTs with enhanced hydrophilicity and conductivity construct an efficient interconnected 3D conductive network inside cathode and anode electrodes.•SPC anode possesses the higher electrical conductivity and more Li+ capacitive storage contribution due to the S doping.•Due to the synergistic effect of the conductive network of SCNTs and the S doping modification on SPC, the mismatch kinetics between cathode and anode is effectively relieved in the designed AC-SCNTs//SPC-SCNTs LIC, even at low temperature. Herein, the integral technology process including the production, doping and tail gas recovery systems is constructed to realize the S doping modification with the excellent universality for arbitrary carbon materials. S-doped porous carbon (SPC) and S-doped carbon nanotubes (SCNTs) obtained by the developed doping methodology are employed as anode material and conductive additives of cathode and anode in lithium ion capacitor (LIC), respectively. The great alleviation of the kinetics mismatch between cathode and anode in LIC is benefited from S doping modification on anode and the construction of efficient conductive network inside electrodes. Besides, the excellent rate capability and durability can still be afforded by the fabricated LIC even at low temperature environment. This work not only develops a scalable, green and universal S doping methodology for arbitrary carbon materials, but also provides a reasonable design for the construction of high-performance LIC device.