Facile construction of 1 T MoS2 assisted by boron nitride co-doped graphite with fast lithium storage kinetics

Abstract

Metallic phase molybdenum disulfide (1 T MoS2) is one of the most promising anode materials for lithium-ion batteries. The 1 T MoS2 is metastable and synthesis of 1 T MoS2 without harsh and hazardous conditions is remain challenging. In this work, stable 1 T MoS2 is prepared by the hydrothermal method utilizing the boron nitride co-doping graphite (BNG) nanosheets as substrates. The doping strategy changed the electron states in the graphite realizing the electron redistribution when combined with MoS2. The BNG nanosheets act as the electron donor stabilizing the 1 T MoS2 and guiding the vertical growth of the MoS2 without agglomeration. As a result, the as-prepared BNG-MoS2 presents an outstanding lithium storage performance of 1056.3 mAh/g after 500 cycles and 248.3 mAh/g of capacity at a high rate of 20 A/g after 2000 cycles. Electrochemical measurements indicate the enhanced lithium storage kinetics is derived from the elevated electron conductivity and lithium-ion migration. The DFT calculation further confirms the origin of the phase transition and fast lithium storage kinetics is the electron redistribution at the interface of BNG-MoS2. This novel strategy gives a new perspective on the synthesis of stable 1 T phase MoS2 for advanced anode materials.