Determination of Li+ solid diffusion coefficient in LiMn2O4 by CITT
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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 wordscapacity titration technique Li+ solid diffusion coefficient LiMn2O4
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