2D Hybrid Nanocomposite: A Promising Anode Material for Lithium-ion Batteries at High Temperature

Abstract

Two-dimensional atomically thick materials including graphene, BN, and molybdenum disulfide (MoS2) have been investigated as possible energy storage materials, because of their large specific surface area, potential redox activity, and mechanical stability. Unfortunately, these materials can't reach their full potential due to low electrical conductivity and layered structural restacking. These problems have been somewhat resolved in the past by composite electrodes composed of a graphene and MoS2 mixture, however insufficient mixing at the nanoscale still limits performance. Here, we examined lithium-ion battery electrodes and reported three composites made using a basic ball milling technique and sonication method. The 5% BN-G@MoS2-50@50 composite obtained has a homogeneous distribution of MoS2 on the graphene sheet and H-BN with a high crystallite. Compared to the other two composites (5% BN-G@MoS2-10@90, and 5% BN-G@MoS2-90@10), the 5% BN-G@MoS2-50@50 composite electrode exhibits a high specific capacity of 765 mAh g-1 and a current density of 100 mA g-1 in batteries. Additionally, the 5% BN-G@MoS2-50@50 composite electrode displays an excellent rate capability (453 mAh g-1 at a current density of 1000 mA g-1) at a high temperature of 70 oC, thanks to h-BN allows reliable and safe operation for Lithium-ion battery. Our research may pave the way for the sensible design of different anode materials, including 2D materials (5% BN-G@MoS2-50@50) for high-performance LIBs and other energy-related fields.