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

• DOI: 10.1007/s40820-019-0341-6
• Publication Date: 2019-12-12T02:48:59Z
• Authors: Jianli Wang; Zhao Zhang; Xufeng Yan; Shunlong Zhang; Zihao Wu; Zhihong Zhuang; Wei-Qiang Han
• Keywords: Technology; T; Spray drying method; Nitrogen-doping; N-Ti3C2 MXene@CNT microspheres; High cycling stability; 7. Clean energy; 01 natural sciences; Article; Lithium–sulfur battery; 0104 chemical sciences

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