Research On Transition Metal Sulfides In Anode Battery Material

Aiming at the research and development of new lithium-ion battery anode materials in order to improve the performance of lithium-ion batteries,this topic focuses on how to prepare new lithium-ion battery anode materials with high energy density and stable electrochemical performance.Mainly by synthesizing transition metal sulfide with unique morphology to improve its performance as a lithium ion battery,and by introducing other materials that are helpful to improve the shortcomings of transition metal sulfide itself,to complement its use in electrochemical reactions Possible shortcomings,give full play to the excellent performance of various materials,and make up for the disadvantages of individual materials in the electrochemical reaction of lithium ion batteries.The research background of the first chapter of this paper mainly introduces the development history and basic composition of lithium-ion batteries,briefly introduces the functions of each component in the battery,and mainly analyzes the development status of anode materials,the application prospects of various materials and how to improve and Improve the performance of electrode materials.At the end of the chapter,the research significance and research contents of this paper are briefly introduced.The second chapter mainly introduces the preparation method of the dodecahedron Co₃S₄@C@MoS₂ composite material and the excellent performance of the electrode material.The author uses the MOF material ZIF-67 as a template to synthesize a Co₃S₄@C@MoS₂composite material with a regular dodecahedron hollow structure by a simple hydrothermal method.The target product is due to the hollow double-layer structure and the addition of carbon The cladding layer makes it have a higher reversible specific capacity in lithium-ion batteries,and at the same time greatly enhances the structural stability of the composite material,which can show better cycling performance in electrochemical cycling.The excellent performance and unique structure make it obtain better performance than most of the same type of materials,and have better prospects for application in electrode materials.The third chapter introduces the synthesis method of electrostatic self-assembly,combining silicon nanoparticle with SnS₂ and rGO to prepare micro-nano structure Si@SnS₂-rGO composite material.Because the composite has the space-constraining effect of rGO and the layered structure of SnS₂,it can not only reduce the transmission distance of Li⁺ions,but also prevent the accumulation of active particles in the electrochemical cycle,thereby reducing the volume expansion of the material in the electrochemical reaction.The effects brought by this will enhance the chemical stability of the material and improve the structural stability.Nano-silicon particles can provide a large amount of lithium-ion battery storage capacity.The gradual lithiation/delithiation of SnS₂ can provide a nano-space-limiting effect to adapt to the volume expansion of the material and particle aggregation,thereby reducing the volume expansion of silicon in the cycle and enhancing structural stability At the same time,the micro and nano-structured Si@SnS₂-rGO composites show excellent cycle stability.Compared with materials without composites,the performance has been greatly improved.At the same time,the capacity and stability also exceed most similar materials.Therefore,micro-nanostructured Si@SnS₂-rGO composites will be a new promising cathode material for lithium-ion batteries.Finally,in the fourth chapter,a brief summary of the work of the author's postgraduate is made,and the innovations and deficiencies of all work are analyzed in detail.