Preparation Of MoS₂ Based Anode Material And Application In Lithiumion Batteries

Lithium ion batteries due to the high voltage, light quality, small volume, small pollution to the environment, long cycle life and given a higher advantage is considered to be the best comprehensive properties of the battery system and received from attention of national enterprises and research workers. And anode material of lithium ion battery is an important factor that affect the overall performance of lithium ion batteries. Recently, molybdenum disulfide, because of its unique structure and excellent performance of lithium storage is widely attention. Based on transition metal sulfides molybdenum disulfide, we take the preparation and application of molybdenum disulfide and its composites as the research object. Contents are as followings:（1） Developed a SiO₂-directed strategy for the surface control of hierarchical MoS₂ microspheres as advanced anode materials for Li-ion batteries. The as-obtained MoS₂ microspheres constructed with nanosheets show excellent battery performance, especially superior stability, due to their unique surface structure and extended interlayer distance of the nanosheets.（2） Nitrogen and sulfur co-doped graphene supported MoS₂ （MoS₂/NS-G） nanosheets were prepared through a one-pot thermal annealing method. We characterized the as prepared samples by scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, X-ray photoelectron spectroscopy （XPS）, Raman spectra and electrochemical techniques. The MoS₂/NS-G shows high reversible capacity about 1200 mAh/g at current density of 150 mA/g and excellent stability in Li-ion batteries. It was demonstrated the co-doping of graphene by N and S could significantly enhance the durability of MoS₂ as anode materials for Li-ion batteries.（3） The Ni₃S₂ interlayer was successfully in-situ formed between MoS₂ and Ni foam by decomposing MoS₂ precurors （（NH4）2MoS₄） on Ni foam （denoted as MoS₂/Ni₃S₂/Ni）. The presence of Ni₃S₂ interlayer significantly enhanced the interaction between MoS₂ and Ni foam support, resulting in excellent stability in lithium-ion batteries. In addition, the 3D foam structure facilitates the ion diffusion and electron transportation properties of the electrode materials, leading to high-rate and highly durable performance. The as-prepared MoS₂/Ni₃S₂/Ni reveals a capacity of 1263 mAh/g after 100 cycles at a current density of 0.1 A/g. On the other hand, it shows excellent rate performance, and its capacity can maintain at 740 mAh/g even at a high current density of 10 A/g. The interlayer strategy provides a novel idea for the design of durable electrode materials in electrochemical energy storage devices.