Nano-Micro Letters

Rational Design of Porous N-Ti3C2@CNT Microspheres for High Cycling Stability Li-S Battery

Jianli Wang1, Zhao Zhang1, Xufeng Yan1, Shunlong Zhang1, Zihao Wu1, Zhihong Zhuang1, Wei-Qiang Han1, *

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Nano-Micro Lett. (2020) 12: 4

First Online: 12 December 2019 (Article)

DOI:10.1007/s40820-019-0341-6

*Corresponding author. E-mail: hanwq@zju.edu.cn (Wei-Qiang Han)

 

Abstract

 


Toc

Herein, N-Ti3C2@CNT microspheres are successfully synthesized by the simple spray drying method. In the preparation process, HCl-treated melamine (HTM) is selected as the sources of carbon and nitrogen. It not only realizes in-situ growth of CNTs on the surface of MXene nanosheets with the catalysis of Ni, but also introduces efficient N-doping in both MXene and CNTs. Within the microsphere, MXene nanosheets interconnect with CNTs to form porous and conductive network. In addition, N-doped MXene and CNTs can provide strong chemical immobilization for polysulfides and effectively entrap them within the porous microspheres. Above-mentioned merits enable N-Ti3C2@CNT microspheres to be ideal sulfur host. When used in lithium-sulfur (Li-S) battery, the N-Ti3C2@CNT microspheres/S cathode delivers initial specific capacity of 927 mAh g–1 at 1 C and retains high capacity of 775 mAh g–1 after 1000 cycles with extremely low fading rate (FR) of 0.016% per cycle. Furthermore, the cathode still shows high cycling stability at high C-rate of 4 C (capacity of 647 mAh g–1 after 650 cycles, FR 0.027%) and high sulfur loading of 3 and 6 mg cm–2 for Li-S batteries.


 

Keywords

Spray drying method; N-Ti3C2@CNT microspheres; Nitrogen-doping; High cycling stability; Lithium-sulfur battery

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