Development Of Low-dimensional Titanate And Perovskite Structured Anode Materials Of Lithium-ion Battery

Lithium ion batteries have attracted much attention from researchers because of their high energy density,excellent cycle life and low price.In recent years,lithium ion batteries have been gradually put into the market and widely used in smart devices such as mobile phones.Commercial lithium-ion batteries are graphite anode materials,which have still many problems,and there is an urgent need to find alternative anode materials.This paper studies the properties of titanium dioxide,lithium titanate and perovskite CsPbCl₃ as lithium-ion battery anode materials,which were characterized by XRD,SEM,TEM,BET and XPS,tested by the blue electric test system and the electrochemical workstation,and modified according to its disadvantages.The specific research contents are as follows:1、The anatase type TiO₂ was prepared by electrospinning,and the XPS test results showed that the sample obtained by calcination under ammonia atmosphere was doped with2.68%N element.After 500 cycles at a current density of 100mA/g,the specific capacity of N-doped TiO₂ was consistently higher than 150mA/g,while the pure TiO₂ specific capacity was reduced to 135mAh/g.2、Lithium titanate doped with different concentrations of Li⁺was prepared by electrostatic spinning method.According to the previous research results,the optimal ratio of lithium titanate was selected to prepare tubular lithium titanate and graphene doping was carried out.Lithium titanate with 30%,50%,70%and 100%Li⁺doping concentration was prepared.When the current density was 100mA/g,the initial specific capacities were150.6mAh/g,154.4mAh/g,157.5mAh/g and 162.8mAh/g,respectively.It can be found that the sample with 100%Li⁺doping concentration has the highest specific capacity for the first time.Under the same current density,the initial specific capacities of before and after graphene doping were 170.6mAh/g and 185.6mAh/g,respectively,and the capacity retention rates after 100 cycles were 93.44%and 94.18%,respectively.3、CsPbCl₃ with the cubic phase was synthesized by thermal injection and Mn²⁺doping.Under the blue charge and discharge test,the first specific capacity of the sample before and after doping with the current density of 100mA/g was 217.5mAh/g,247.8mAh/g,and the capacity retention rate was 65.93%and 80.63%after 200 cycles,respectively.The results show that Mn²⁺doping can improve the cyclic stability and capacity retention rate of CsPbCl₃,which can replace part of harmful Pb²⁺,being beneficial to reduce environmental pollution.