posted on 2020-11-05, 04:43authored byWenwei Zhan, Ming Zhu, Jinle Lan, Haocheng Yuan, Haijun Wang, Xiaoping Yang, Gang Sui
Though
being a promising anode material for sodium-ion batteries
(SIBs), MoS2 with high theoretical capacity shows poor
rate capability and rapid capacity decay, especially involving the
conversion of MoS2 to Mo metal and Na2S. Here,
we report all-in-one MoS2 nanosheets tailored by porous
nitrogen-doped graphene (N-RGO) for the first time to achieve superior
structural stability and high cycling reversibility of MoS2 in SIBs. The all-in-one MoS2 nanosheets possess desirable
structural characteristics by admirably rolling up all good qualities
into one, including vertical alignment, an ultrathin layer, vacancy
defects, and expanded layer spacing. Thus, the all-in-one MoS2@N-RGO composite anode exhibits an improvement in the charge
transport kinetics and availability of active materials in SIBs, resulting
in outstanding cycling and rate performance. More importantly, the
restricted growth of all-in-one MoS2 by the porous N-RGO
via a strong coupling effect dramatically improves the cycling reversibility
of conversion reaction. Consequently, the all-in-one MoS2@N-RGO composite anode demonstrates excellent reversible capacity,
outstanding rate capability, and superior cycling stability. This
study strongly suggests that the all-in-one MoS2@N-RGO
has great potential for practical application in high-performance
SIBs.