Insights into the sandwich-like ultrathin Ni-doped MoS2/rGO hybrid as effective sulfur hosts with excellent adsorption and electrocatalysis effects for lithium-sulfur batteries

• 作者: Ran Zhang Yutao Dong Mohammed A.Al-Tahan Yingying Zhang Ruipeng Wei Yuhang Ma Changchun Yang Jianmin Zhang
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（9）
• 页码范围: 85-94
• 页数: 10页
• 语种: 英文

摘要

The design of sulfur hosts with high conductivity,large specific surface area,strong adsorption and elec-trocatalytic ability is crucial to advance high performance lithium-sulfur batteries.Herein,a novel ultra-thin sandwich-type Ni-doped MoS2/reduced graphene oxide(denote as Ni-doped MoS2/rGO)hybrid is developed as a sulfur host through a simple one-step hydrothermal route.The two-dimensional layered structure Ni-doped MoS2/rGO hybrid with heterostructure and heteroatom architecture defects not only plays a key role in adsorption of lithium polysulfide but also catalyzes on redox kinetics of sulfur and polysulfide species.Meanwhile,it can contribute to the large specific surface area for Li2S/S8 deposition,fast Li-ion and electron transportation,thus enhancing the electrocatalytic properties,as confirmed firstly by cyclic voltammetry(CV)results.Due to the adsorption-catalytic synergistic effect,the Ni-doped MoS2/rGO cathode exhibits high specific capacity(1343.6 mA h g-1 at 0.2 C,921.6 mA h g-1 at 1 C),high coulombic efficiency and an outstanding cycle stability(with the low attenuation rate of 0.077％per cycle over 140 cycles at 0.5 C and 0.11％per cycle over 400 cycles at 1 C,respectively).This work proposes some inspiration for exploring the construction of advanced lithium-sulfur batteries through the rational design defects of atomic structure and electronic states of MoS2 as sulfur host.