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Determination of Li+ solid diffusion coefficient in LiMn2O4 by CITT

  • Tang Xin-cun Email author
  • Huang Bai-yun 
  • He Yue-hui 
Materials Science and Engineering

Abstract

The capacity intermittent titration technique (CITT) was developed based on the ratio of potentio-charge capacity to galvano-charge capacity (RPG) method, to continuously determine the solid diffusion coefficient (D) of the intercalary species within insertion-host materials with a small voltage region. The linear equations of D vs the value of ratio of the potentio-charge capacity to the galvano-charge capacity (q) were given. By the CITT technique, the Li+ solid diffusion coefficients within LiMn2O4 at different voltages were determined. The results show that the values of D varied from 3.447 × 10−9 to 7.60 × 10−11 cm2/s in the voltage range of charge from 3.3 to 4.3 V as a function of voltage with “W” shape.

Key words

capacity titration technique Li+ solid diffusion coefficient LiMn2O4 

CLC number

TM912 

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Copyright information

© Central South University 2005

Authors and Affiliations

  • Tang Xin-cun 
    • 1
    • 2
    Email author
  • Huang Bai-yun 
    • 2
  • He Yue-hui 
    • 2
  1. 1.School of Chemistry and Chemical EngineeringCentral South UniversityChangshaChina
  2. 2.State Key Laboratory of Powder MetallurgyCentral South UniversityChangshaChina

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