Atomic-interface strategy and N,O co-doping enable WS2 electrodes with ultrafast ion transport rate in sodium-ion batteries

Han, Meisheng1,2,3; Mu, Yongbiao1,2,3; Cai, Yuanyuan1,2,3; Wei, Lei1,2,3; Zeng, Lin1,2,3; Zhao, Tianshou1,2,3

2022-08-01

10.1039/d2ta04984h

Journal of Materials Chemistry A   Impact Factor & Quartile

2050-7488

2050-7496

The high theoretical capacity and graphene-like structure enable WS2 to be a promising anode material for fast-charging sodium-ion batteries. However, poor intrinsic electrical conductivity and large Na+-diffusion energy barrier limit its practical applications. Here, an atomic-interface strategy and N,O co-doping were first introduced for WS2 electrodes to obtain a unique WS2/C nanocomposite. The atomic-interface strategy that allowed the construction of a unilamellar interoverlapped superstructure maximized the contact area of WS2 and C, thus significantly improving the electrical conductivity and decreasing the Na+-diffusion energy barrier of WS2 electrodes during cycling. More importantly, the atomic-interface strategy suppressed the growth of superparamagnetic W metallic nanoparticles during conversion reactions, resulting in a strong surface-capacitance effect to boost the Na+ transport. Besides, N,O co-doping changed the electronic structure of WS2 to decrease the bandgap from 1.6 to 0 eV and enlarged the interlayer spacing between WS2 and C, thus boosting the electron and ion transport. Consequently, WS2/C exhibited an ultrafast Na+-storage capability (450.8 mA h g(-1) at 13 A g(-1)), with an ultrahigh capacity of 669.2 mA h g(-1) at 0.065 A g(-1) and an ultralong lifetime of over 3000 cycles at 6.5 A g(-1) in half-cells. Further, the full-cells showed superior fast-charging capability with an 80.6% capacity retention at 1.95 A g(-1).

SCI

English

First ; Corresponding

Shenzhen Fundamental Research Programs[JCYJ20200109141216566] ; Shenzhen Key Laboratory of Advanced Energy Storage[202204013000060] ; Foundation for Advanced Talents of Southern University of Science and Technology["Y01336134","Y01336234"]

Chemistry ; Energy & Fuels ; Materials Science

Chemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary

WOS:000847708000001

ROYAL SOC CHEMISTRY

Web of Science

1.Southern Univ Sci & Technol, Shenzhen Key Lab Adv Energy Storage, Shenzhen 518055, Peoples R China
2.Southern Univ Sci & Technol, SUSTech Energy Inst Carbon Neutral, Shenzhen 518055, Peoples R China
3.Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen 518055, Peoples R China

Han, Meisheng,Mu, Yongbiao,Cai, Yuanyuan,et al. Atomic-interface strategy and N,O co-doping enable WS2 electrodes with ultrafast ion transport rate in sodium-ion batteries[J]. Journal of Materials Chemistry A,2022.

Han, Meisheng,Mu, Yongbiao,Cai, Yuanyuan,Wei, Lei,Zeng, Lin,&Zhao, Tianshou.(2022).Atomic-interface strategy and N,O co-doping enable WS2 electrodes with ultrafast ion transport rate in sodium-ion batteries.Journal of Materials Chemistry A.

Han, Meisheng,et al."Atomic-interface strategy and N,O co-doping enable WS2 electrodes with ultrafast ion transport rate in sodium-ion batteries".Journal of Materials Chemistry A (2022).