Determination of Li⁺ solid diffusion coefficient in LiMn₂O₄ by CITT

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.

Keywords

capacity titration technique / Li⁺ solid diffusion coefficient / LiMn₂O₄

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