The kinetics investigation of nitrogen/sulfur co-doped reduced graphene oxide@spinel SnFe2O4/Sn0.205Fe1.727O3 as high performance anode for lithium-ion batteries and its application in full cells

• Published in: Electrochimica acta 2021-04, Vol.375, p.138026, Article 138026
• Main Authors: Wei, Jing-Lan, Wang, Zi-Yu, Sun, Yan-Hui, Zhang, Guang-Li, Guan, Dong-Cai, Nan, Jun-Min
• Format: Article
• Language: English
• Subjects: Lithium-ion battery; N/S co-doped graphene oxide; Pseudocapacitance; SnFe2O4
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/j.electacta.2021.138026

•A novel N/S co-doped rGO@SnxFeyOz (NSG@SFO) synthesized for LIBs anodes.•It showed 529/430 mAh g−1 at the 1000th/100th cycle at 6/1.4 A g−1 in a half/full cell.•NSG@SFO showed an obvious surface pseudocapacitive effect compared to pure SFO.•NSG@SFO exhibits a lower Li-ion transfer activation energy in the SEI film than SFO. A novel N/S co-doped reduced graphene oxide (rGO) composited with spinel SnFe2O4/Sn0.205Fe1.727O3 (NSG@SFO) is synthesized as a new anode for Lithium ion batteris (LIBs). The NSG@SFO anode showed a remarkably high charge/discharge capacity of 527/529 mAh g−1 after 1000 cycles at 6 A g−1 in half-cell and a high charge capacity of 430 mAh g−1 after 100 cycles at 1.4 A g−1 in full-cell configurations. The excellent performance of NSG@SFO is due to the heteroatom co-doping of N and S on reduced graphene oxide can enhance the electronic conductivity, control huge volume expansion/contraction and maintain the structural stability of SFO. The kinetics investigation indicates that the combination of N/S co-doped rGO with SFO exhibited high surface pseudocapacitive behavior and possesses lower activation energies both for the Li-ion transfer in the solid electrolyte interphase film and the charge transfer in the material than pure SFO. Such intrinsic quality makes NSG@SFO composites promising anode material for high performance LIBs. [Display omitted]