Empirical Li-ion aging model derived from single particle model

2019 ◽  
Vol 21 ◽  
pp. 773-786 ◽  
Author(s):  
Sabrina Kathrin Rechkemmer ◽  
Xiaoyun Zang ◽  
Weimin Zhang ◽  
Oliver Sawodny
Keyword(s):  
Single Particle ◽  
Particle Model ◽  
Aging Model ◽  
Li Ion ◽  
Single Particle Model

A new single-particle model to evaluate the Li-ions diffusion coefficients of LiMn1−xFexPO4

2019 ◽  
Vol 12 (05) ◽  
pp. 1950071
Author(s):  
Hejie Li ◽  
Hongbin Wang ◽  
Wenju Ren ◽  
Jiangtao Hu ◽  
Yuan Lin ◽  
...  
Keyword(s):  
Single Particle ◽  
Diffusion Coefficients ◽  
Particle Model ◽  
Cyclic Voltammogram ◽  
Ion Diffusion ◽  
One Dimensional ◽  
Reduction Processes ◽  
Dimensional Diffusion ◽  
Li Ion ◽  
Single Particle Model

It remains a challenge to evaluate the Li-ions diffusion coefficients of LiMn[Formula: see text]FexPO4 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 LiMn[Formula: see text]FexPO4 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 LiMn[Formula: see text]FexPO4 reach the maximum when [Formula: see text]. In addition, the values for oxidation processes are much larger than those for reduction processes.

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