Document Type

Article

Publication Date

11-17-2017

Publication Title

Energies

Abstract

Researchers are in search of parameters inside Li-ion batteries that can be utilized to control their external behavior. Physics-based electrochemical model could bridge the gap between Li+ transportation and distribution inside battery and battery performance outside. In this paper, two commercially available Li-ion anode materials: graphite and Lithium titanate (Li4Ti5O12 or LTO) were selected and a physics-based electrochemical model was developed based on half-cell assembly and testing. It is found that LTO has a smaller diffusion coefficient (Ds) than graphite, which causes a larger overpotential, leading to a smaller capacity utilization and, correspondingly, a shorter duration of constant current charge or discharge. However, in large current applications, LTO performs better than graphite because its effective particle radius decreases with increasing current, leading to enhanced diffusion. In addition, LTO has a higher activation overpotential in its side reactions; its degradation rate is expected to be much smaller than graphite, indicating a longer life span.

Volume

10

Issue

12

First Page

2174

Last Page

2194

DOI

https://doi.org/10.3390/en10122174

ISSN

1996-1073

Comments

ESSN: 1996-1073

Rights

© 2017 Multidisciplinary Digital Publishing Institute (MDPI)

Download

Share

COinS