A new single-particle model to evaluate the Li-ions diffusion coefficients of LiMn1-xFexPO4
Abstract
It remains a challenge to evaluate the Li-ions diffusion coefficients of LiMn1-xFexPO4 due to the presence of two voltage platforms upon charge/discharge. In this paper, a new single-particle model based on Butler-Volmer (BV) equation and one-dimensional diffusion equation is established. Using this model, the cyclic voltammogram curves of LiMn1-xFexPO4 single-particle electrodes are successfully fitted and their Li-ion diffusion coefficients in organic electrolyte are obtained. Through analyzing the diffusion coefficients, it is found that the Li-ions diffusion coefficients for both Fe and Mn redox processes in LiMn1-xFexPO4 reach the maximum when x=0.4. In addition, the values for oxidation processes are much larger than those for reduction processes.
- Publication:
-
Functional Materials Letters
- Pub Date:
- 2019
- DOI:
- 10.1142/S1793604719500711
- Bibcode:
- 2019FML....1250071L
- Keywords:
-
- Single-particle model;
- LiMn1-xFe<SUB>x</SUB>PO<SUB>4</SUB>;
- Li-ions diffusion coefficients;
- lithium ion battery