Vanadium Nitride Quantum Dots/Holey Graphene Matrix Boosting Adsorption and Conversion Reaction Kinetics for High-Performance Lithium–Sulfur Batteries

• DOI: 10.1021/acsami.1c08113
• Publication Date: 2021-06-25T17:34:15Z
• Authors: Fu Li; Mengjie Zhang; Wenyan Chen; Xin Cai; Huashang Rao; Jian Chang; Yueping Fang; Xinhua Zhong; Yu Yang; Zhuohong Yang; Xiaoyuan Yu
• Keywords: Vanadium nitride

Lithium–sulfur batteries (LSBs) have been considered as potential next-generation energy storage systems due to their high specific of 2600 Wh kg–1 and 2800 L–1. Nevertheless, the practical application LSBs still faces several hazards, including shuttle effect soluble lithium polysulfides, low electrical conductivities solid sulfur sulfides, large volume expansion during charge/discharge cycles. To address this critical challenge, we innovatively proposed facile synthesis nanostructured VN quantum dots (VNQD)/holey graphene matrix for stabilizing cathode by simultaneously promoting trapping, anchoring, catalyzing efficiencies both LiPSs Li2S. Benefiting from abundant edge catalytic sites VNQD, in-plane nanopores graphene, conductivity, host not only provides adsorption capability toward strong binding ability anchoring Li2S, rapid conversion kinetics but also contributes efficient transport pathways ions (Li+) electrons. Consequently, exhibits initial capacities 1320 mAh g–1, rate (850 g–1 @ 4 mA cm–2), capacity retention 99.95% per cycle after 500 cycles, providing a feasible solution utilization shuttle-free Li–S batteries.