Electrochemistry
Online ISSN : 2186-2451
Print ISSN : 1344-3542
ISSN-L : 1344-3542

This article has now been updated. Please use the final version.

CORRECTED PROOF
Study on Prediction Model of Performance and Degradation of LFP/Graphite Lithium-ion Battery
Tsutomu HASHIMOTO Hirokazu MUNAKATAKiyoshi KANAMURA
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JOURNAL OPEN ACCESS Advance online publication
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Article ID: 20-00140

CORRECTED PROOF: March 05, 2021
UNCORRECTED PROOF: February 12, 2021
ACCEPTED MANUSCRIPT: January 30, 2021
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Abstract

The initial degradation behavior of lithium-ion batteries is complicated, and it has been difficult to construct a model that sufficiently matches the capacity change in cycle life tests and calendar life tests under different conditions. In this study, we measured the performance and lifetime of LiFePO4/Graphite lithium-ion battery and analyzed their electrochemical and degradation characteristics. As a result, we predicted the mechanism as follows. There are two or more phases of side reactions, including reversible reaction that forms the SEI layer and the sequential reaction that produces the non-rechargeable substance. These reactions proceed simultaneously, and each reaction rate changes depending on the electrode potential. In addition, the SEI layer is formed by the former reversible reaction and prevents the diffusion of the deteriorated substance. This model is able to fit to the complicated degrading behavior of the lithium-ion battery.

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© The Author(s) 2020. Published by ECSJ.

This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any medium provided the original work is properly cited. [DOI: 10.5796/electrochemistry.20-00140].
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