Preparation And Characterization Of Lithium Manganate As Lithium Ion Battery Anode Material

Lithium ion battery is high-energy rechargeable battery; it has so many advantages, such as high working voltage, large specific energy, low self-discharge, long cycle life, no memory effect, no environmental pollution and so on, which are widely used in various fields. Spinel lithium manganese acid anode material has advantages of non-toxic, low cost and high capacitance, which is the more development potential of lithium ion materials in the 21st century.Spinel LiMn2O4 cathode material is a typical 3 d tunnel structure, which contributes to improving the ability of the ion diffusion when the battery is in circulation charge and discharge. In this paper, using high temperature mechanical force method, we sinteringed synthetic manganese acid lithium anode materials under air atmosphere with electrolytic manganese dioxide and lithium carbonate. Using X-ray diffraction (XRD), scanning electron microscope (SEM) and other characterization methods were to analyze the structure of the synthesis of lithium manganese acid samples, microstructure, and so on.In addition, constant current charge and discharge use cyclic voltammetry and ac impedance electrical test methods were to characterize the electrochemical properties of the materials.High temperature mechanical force chemistry research to analyze ball milling temperature, time, molar ratio of Li to Mn and balls/material weight ratio were on the LiMn2O4 material structure, the average size of particle, specific surface, the influence of the microstructure, and then we also studied the electrochemical properties of materials:charge and discharge performance, performance and cycle performance. It got that the results of the study is the best synthesis conditions of LiMn2O4 cathode material:LiMn2O4 powders acquired at 650℃ for 12 h, the molar ratio of Li/Mn was 1.05:2, alls/material weight ratio was 10:1. Under the best synthesis conditions, combined with XRD、SEM Laser particle size analysis and BET analysis, LiMn2O4 cathode material has typically spinel structure, high crystallinity, no impurity phase and the average particle size small, good dispersion. The first discharge specific capacity at 0.1 C was 123.8 mAh-g-1. The discharge specific capacity was 103.4 mAh·g-1 over 20 cycles at 0.1 C. Different magnification materials, along with the charging and discharging rate gradually increaseing, specific capacity decreases and cycle stability rises.