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