The Preparation And Investigation Of Anode Materials In Lithium-ion Batteries

Lithium ion battery（LIBs）is widely recognized and applied in many fields due to its advantages such as light weight,high energy density,safety and long cycle life.Electrochemical performance is an important index to evaluate the battery,and the selection of electrode materials directly influences its electrochemical properties.this paper mainly focuses on the preparation,characterization and application of electrode materials in lithium ion batteries.The main work is as follows:（1）Molybdenum trioxide（MoO₃）microplates are synthesized via the hydrothermal method and a simple heat treatment process without adding surfactant.The preparing conditions such as reaction time,temperature and acidity are explored.These results reveal that the hydrothermal reaction conditions and acidity have great impact on the morphology of MoO₃ microplates.As anode materials in LIBs,the assembly of flake-shaped MoO₃microparticles shows more excellent cycling performance and more superior morphology with the proper preparation condition.Also the coulombic efficiency of the prepared MoO₃microplates remains high during the charge/discharge cycles,demonstrating its better electrochemistry properties.（2）The rice hull（RHC）,mold（MC）and pomelo peel（PPC）were selected as biomass derived carbon sources.the MoS2/RHC,MoS2/MC and MoS2/PPC composites are obtained.The electrochemical results showed that the the reversible capacity of MoS₂/RHC,MoS₂/MC and MoS₂/PPC are superior to that of individual electrode materials.moreover,AC impedance test show that the conductivity of the composite materials is also greatly improved.（3）The surface functionalized carbon nanotubes（CNTs）are obtained by means of the mild oxidation method and Ni-MOF/CNTs and MoS2/CNTs composite electrode materials are prepared successfully.The characterization results show that the composite has a large specific surface area and a rich pore structure.The stability performance test results show that MoS2/CNTs and Ni-MOF/CNTs have higher initial discharge specific capacity.After 60cycles the capacity retention value is much higher than that of single CNTs,indicating the excellent cycle stability.And the AC impedance test results show that the conductivity of the composite material is significantly higher than that of the single material.