Electrochemistry
Online ISSN : 2186-2451
Print ISSN : 1344-3542
ISSN-L : 1344-3542
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LiNi0.8Co0.1Mn0.1O2/黒鉛電池の熱安定性に及ぼす劣化の影響
井上 尊夫 駒形 将吾伊藤 勇一近藤 広規
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2022 年 90 巻 11 号 p. 117001

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The active reuse of automotive lithium-ion batteries (LIBs) no longer utilized in electric vehicles for onboard applications is an effective way to achieve carbon neutrality. However, the safety of used LIBs, whose chemical composition of components has changed from that of new ones due to degradation, is still unknown, and the relationship between degradation and safety needs to be understood. The purpose of this study is to clarify the effect of degradation on the thermal stability of the battery by numerical simulation for LiNi0.8Co0.1Mn0.1O2 (NCM811)/graphite battery using high-Ni layered oxide NCM811, which has recently attracted attention as a high-capacity positive electrode. The numerical simulation was employed to clarify the effect of degradation on the thermal stability of the battery. After degradation, the temperature at which the thermal runaway starts increased by 15 °C compared to the initial batteries, indicating that the thermal stability as a battery has improved. It is because the heat generated by the positive electrode near 200 °C, which triggers thermal runaway of batteries, has decreased due to battery degradation.

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© The Author(s) 2022. 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.22-00091].
http://creativecommons.org/licenses/by/4.0/
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