Preparation And Electrochemical Performance Of Lithium MoS₂-TiO₂/C Anode Materials

With the continuous development of artificial intelligence technology,new smart devices and equipment have begun to enter our lives,including constantly updated mobile and wearable electronic products,smart robots and drones,as well as the development of new energy vehicles and autonomous driving technologies that are in full swing today.These intelligent products and equipment are inseparable from the support of energy storage devices,especially with the increasing demand for portability,miniaturization and durability.Energy storage systems,e specially battery systems,have always been the focus of attention.Among them,lithium-ion batteries are the most widely studied and commercialized type of batteries.TiO₂ has the characteristics of low cost and environmental friendliness.It has always been a hot spot in the research of anode materials for lithium-ion batteries.Among them,the anatase phase TiO₂ with a tetrahedral crystal structure has a very high theoretical capacity(335 m Ah/g)The working plateau is flat and the volume change is small during the process of deintercalating of lithium and lithium ions,Hence,it has a long cycle life and good durability as a anode electrode material for lithium ion batteries.However,its limited theoretical capacity limits its use as a anode electrode material to replace graphite anode electrodes.MoS₂ has a layered structure similar to graphene,with good conductivity,high energy density,and high charge and discharge capacity.The special layer structure is conducive to the transmission of Li⁺and capable to high rate charge.It is also a type of anode electrode material that has been widely studied in lithium ion batteries.In this research,a new type of composite anode material for MoS ₂-TiO₂/C lithium ion battery was prepared by solvothermal synthesis.Through the introduction of MoS₂,the material shows a higher specific capacity(420 m Ah/g at 0.1 A/g)than that of traditional graphite.The MoS ₂-TiO₂ phase is evenly wrapped on the carbon nanotube skeleton,which ensures the stability of the m aterial itself.At the same time,the carbon nanotube builds an electron transmission channel inside the particles of the material,which effectively improves the overall conductivity of the material.The material shows good rate performance.A reversible capacity of 158 m Ah/g was reached at 2 A/g.Based on the results of this study,the effect of the calcination temperatures on the properties of the materials was studied,and the changes in the properties of the materials with different carbon nanotube con tent in the materials were also studied.The investigation found that MSTOC-600 exhibits excellent cycle performance and rate performance.The material shows the best performance when the addition amount of carbon nanotube is 10%.Through comparison with TiO₂/C materials,it is found that the introduction of MoS ₂ has greatly improved the capacity and stability of the material,and we have prepared a new type of MoS ₂-TiO₂/C composite anode material with good safety performance and high capacity.Then,we explored the preparation and performance of MoO ₂-ZrO₂/C in a similar way.The introduction of MoO₂ can also significantly improve the performance of the material.The composite material prepared at 500°C has good cycle performance and rate performance.