Simple evaluation method of mechanical strength and mechanical fatigue of negative electrode for lithium-ion battery

Lithium-ion batteries (LIBs) are expected to be main power sources of automobiles. Nevertheless, LIBs easily lead to serious incidents because LIBs have high energy density. For application to automobiles, the reliability of LIBs should be guaranteed against various external loads. Especially, stati...

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Autores principales:	Yoshinao KISHIMOTO, Yukiyoshi KOBAYASHI, Toshihisa OHTSUKA, Shota ONO, Hiroshi YAMAZAKI, Yuki TSUKAGOSHI, Kyohei NAKAMURA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2020
Materias:	battery electrode strength fatigue porous material thin film mechanical modeling Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/054a056f3a1e48259b74d066426f5d73
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spelling	oai:doaj.org-article:054a056f3a1e48259b74d066426f5d732021-11-29T05:59:26ZSimple evaluation method of mechanical strength and mechanical fatigue of negative electrode for lithium-ion battery2187-974510.1299/mej.19-00545https://doaj.org/article/054a056f3a1e48259b74d066426f5d732020-03-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/7/4/7_19-00545/_pdf/-char/enhttps://doaj.org/toc/2187-9745Lithium-ion batteries (LIBs) are expected to be main power sources of automobiles. Nevertheless, LIBs easily lead to serious incidents because LIBs have high energy density. For application to automobiles, the reliability of LIBs should be guaranteed against various external loads. Especially, static loads and cyclic loads are constantly applied on LIBs because of vibration and thermal stress induced in automobiles, and fatigue damage occurs in electrodes of the LIBs. In this respect, it is important to evaluate mechanical strength and mechanical fatigue property of electrodes, such as tensile strength and S-N curves. This study has proposed a simple evaluation method of the mechanical strength and the fatigue property of electrodes for LIBs by using mechanical models of the electrodes. The actual alignment of particles of active material is random, and mechanical models based on the actual alignment are too complex to derive the main factor of mechanics of the electrodes. The proposed models approximate the alignment of the particles as the body-centered cubic (bcc) and the face-centered cubic (fcc) which are the well-known crystal lattices. In order to verify the proposed method, static tensile tests and bending fatigue tests of negative electrodes for LIBs have been conducted. From the test results, the tensile strength of the negative electrodes estimated by the proposed models agree with the experimental values, and the difference between the bcc model and the fcc model is smaller than the variation of the experimental values. The estimation value of the stress that initiates a crack on the negative electrodes by 1 cycle agrees with the tensile strength. The number of cycles linearly increases in the log scale with the decrease of the stress amplitude, and the stress amplitude at the 106–107 cycles agrees with the half of the tensile strength.Yoshinao KISHIMOTOYukiyoshi KOBAYASHIToshihisa OHTSUKAShota ONOHiroshi YAMAZAKIYuki TSUKAGOSHIKyohei NAKAMURAThe Japan Society of Mechanical Engineersarticlebatteryelectrodestrengthfatigueporous materialthin filmmechanical modelingMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 7, Iss 4, Pp 19-00545-19-00545 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	battery electrode strength fatigue porous material thin film mechanical modeling Mechanical engineering and machinery TJ1-1570
spellingShingle	battery electrode strength fatigue porous material thin film mechanical modeling Mechanical engineering and machinery TJ1-1570 Yoshinao KISHIMOTO Yukiyoshi KOBAYASHI Toshihisa OHTSUKA Shota ONO Hiroshi YAMAZAKI Yuki TSUKAGOSHI Kyohei NAKAMURA Simple evaluation method of mechanical strength and mechanical fatigue of negative electrode for lithium-ion battery
description	Lithium-ion batteries (LIBs) are expected to be main power sources of automobiles. Nevertheless, LIBs easily lead to serious incidents because LIBs have high energy density. For application to automobiles, the reliability of LIBs should be guaranteed against various external loads. Especially, static loads and cyclic loads are constantly applied on LIBs because of vibration and thermal stress induced in automobiles, and fatigue damage occurs in electrodes of the LIBs. In this respect, it is important to evaluate mechanical strength and mechanical fatigue property of electrodes, such as tensile strength and S-N curves. This study has proposed a simple evaluation method of the mechanical strength and the fatigue property of electrodes for LIBs by using mechanical models of the electrodes. The actual alignment of particles of active material is random, and mechanical models based on the actual alignment are too complex to derive the main factor of mechanics of the electrodes. The proposed models approximate the alignment of the particles as the body-centered cubic (bcc) and the face-centered cubic (fcc) which are the well-known crystal lattices. In order to verify the proposed method, static tensile tests and bending fatigue tests of negative electrodes for LIBs have been conducted. From the test results, the tensile strength of the negative electrodes estimated by the proposed models agree with the experimental values, and the difference between the bcc model and the fcc model is smaller than the variation of the experimental values. The estimation value of the stress that initiates a crack on the negative electrodes by 1 cycle agrees with the tensile strength. The number of cycles linearly increases in the log scale with the decrease of the stress amplitude, and the stress amplitude at the 106–107 cycles agrees with the half of the tensile strength.
format	article
author	Yoshinao KISHIMOTO Yukiyoshi KOBAYASHI Toshihisa OHTSUKA Shota ONO Hiroshi YAMAZAKI Yuki TSUKAGOSHI Kyohei NAKAMURA
author_facet	Yoshinao KISHIMOTO Yukiyoshi KOBAYASHI Toshihisa OHTSUKA Shota ONO Hiroshi YAMAZAKI Yuki TSUKAGOSHI Kyohei NAKAMURA
author_sort	Yoshinao KISHIMOTO
title	Simple evaluation method of mechanical strength and mechanical fatigue of negative electrode for lithium-ion battery
title_short	Simple evaluation method of mechanical strength and mechanical fatigue of negative electrode for lithium-ion battery
title_full	Simple evaluation method of mechanical strength and mechanical fatigue of negative electrode for lithium-ion battery
title_fullStr	Simple evaluation method of mechanical strength and mechanical fatigue of negative electrode for lithium-ion battery
title_full_unstemmed	Simple evaluation method of mechanical strength and mechanical fatigue of negative electrode for lithium-ion battery
title_sort	simple evaluation method of mechanical strength and mechanical fatigue of negative electrode for lithium-ion battery
publisher	The Japan Society of Mechanical Engineers
publishDate	2020
url	https://doaj.org/article/054a056f3a1e48259b74d066426f5d73
work_keys_str_mv	AT yoshinaokishimoto simpleevaluationmethodofmechanicalstrengthandmechanicalfatigueofnegativeelectrodeforlithiumionbattery AT yukiyoshikobayashi simpleevaluationmethodofmechanicalstrengthandmechanicalfatigueofnegativeelectrodeforlithiumionbattery AT toshihisaohtsuka simpleevaluationmethodofmechanicalstrengthandmechanicalfatigueofnegativeelectrodeforlithiumionbattery AT shotaono simpleevaluationmethodofmechanicalstrengthandmechanicalfatigueofnegativeelectrodeforlithiumionbattery AT hiroshiyamazaki simpleevaluationmethodofmechanicalstrengthandmechanicalfatigueofnegativeelectrodeforlithiumionbattery AT yukitsukagoshi simpleevaluationmethodofmechanicalstrengthandmechanicalfatigueofnegativeelectrodeforlithiumionbattery AT kyoheinakamura simpleevaluationmethodofmechanicalstrengthandmechanicalfatigueofnegativeelectrodeforlithiumionbattery
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Simple evaluation method of mechanical strength and mechanical fatigue of negative electrode for lithium-ion battery

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