Phase Transition Kinetics of LiFePO4 Biphasic Systems in Aqueous and Non-aqueous Electrolytes
Power characteristics become one of the important performance measures of lithium-ion batteries as high-power applications such as electric vehicles are emerging. Among several electrochemical steps that limit the power characteristics, phase transition kinetics is known as the limiting step for two...
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| Format: | Article |
| Language: | English |
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The Electrochemical Society of Japan
2024-02-01
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| Series: | Electrochemistry |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/electrochemistry/92/2/92_23-00138/_html/-char/en |
| _version_ | 1797291988338343936 |
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| author | Chihiro YAMAMOTO Atsunori IKEZAWA Takeyoshi OKAJIMA Hajime ARAI |
| author_facet | Chihiro YAMAMOTO Atsunori IKEZAWA Takeyoshi OKAJIMA Hajime ARAI |
| author_sort | Chihiro YAMAMOTO |
| collection | DOAJ |
| description | Power characteristics become one of the important performance measures of lithium-ion batteries as high-power applications such as electric vehicles are emerging. Among several electrochemical steps that limit the power characteristics, phase transition kinetics is known as the limiting step for two-phase coexisting (biphasic) materials. In this study, we used LiFePO4 as a model biphasic material and investigated the intrinsic factor that limits the phase transition behavior. When the same LiFePO4 electrodes were tested in non-aqueous and aqueous electrolytes, the activation energy for the aqueous system was lower. In addition, impedance measurements using 4-electrode cells show that the charge-transfer resistance at the electrode/electrolyte interface in the aqueous media is also lower than that in the non-aqueous media, suggesting more facile solvation/de-solvation process in the aqueous media. This indicates that the rearrangement of the phase transition boundary (LiFePO4/FePO4) is sufficiently fast and other factors such as charge-transfer at the electrode/electrolyte interface affects the whole reaction rate. |
| first_indexed | 2024-03-07T19:45:44Z |
| format | Article |
| id | doaj.art-b24bfc2e4fa84acc895472a3e3a76d37 |
| institution | Directory Open Access Journal |
| issn | 2186-2451 |
| language | English |
| last_indexed | 2024-03-07T19:45:44Z |
| publishDate | 2024-02-01 |
| publisher | The Electrochemical Society of Japan |
| record_format | Article |
| series | Electrochemistry |
| spelling | doaj.art-b24bfc2e4fa84acc895472a3e3a76d372024-02-29T02:10:51ZengThe Electrochemical Society of JapanElectrochemistry2186-24512024-02-0192202700102700110.5796/electrochemistry.23-00138electrochemistryPhase Transition Kinetics of LiFePO4 Biphasic Systems in Aqueous and Non-aqueous ElectrolytesChihiro YAMAMOTO0https://orcid.org/0000-0001-9077-7873Atsunori IKEZAWA1https://orcid.org/0000-0002-8857-7159Takeyoshi OKAJIMA2Hajime ARAI3https://orcid.org/0000-0001-6695-637XDepartment of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of TechnologyDepartment of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of TechnologyDepartment of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of TechnologyDepartment of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of TechnologyPower characteristics become one of the important performance measures of lithium-ion batteries as high-power applications such as electric vehicles are emerging. Among several electrochemical steps that limit the power characteristics, phase transition kinetics is known as the limiting step for two-phase coexisting (biphasic) materials. In this study, we used LiFePO4 as a model biphasic material and investigated the intrinsic factor that limits the phase transition behavior. When the same LiFePO4 electrodes were tested in non-aqueous and aqueous electrolytes, the activation energy for the aqueous system was lower. In addition, impedance measurements using 4-electrode cells show that the charge-transfer resistance at the electrode/electrolyte interface in the aqueous media is also lower than that in the non-aqueous media, suggesting more facile solvation/de-solvation process in the aqueous media. This indicates that the rearrangement of the phase transition boundary (LiFePO4/FePO4) is sufficiently fast and other factors such as charge-transfer at the electrode/electrolyte interface affects the whole reaction rate.https://www.jstage.jst.go.jp/article/electrochemistry/92/2/92_23-00138/_html/-char/enphase transitionbiphasic materialsaqueous and non-aqueous systemsavrami plot |
| spellingShingle | Chihiro YAMAMOTO Atsunori IKEZAWA Takeyoshi OKAJIMA Hajime ARAI Phase Transition Kinetics of LiFePO4 Biphasic Systems in Aqueous and Non-aqueous Electrolytes Electrochemistry phase transition biphasic materials aqueous and non-aqueous systems avrami plot |
| title | Phase Transition Kinetics of LiFePO4 Biphasic Systems in Aqueous and Non-aqueous Electrolytes |
| title_full | Phase Transition Kinetics of LiFePO4 Biphasic Systems in Aqueous and Non-aqueous Electrolytes |
| title_fullStr | Phase Transition Kinetics of LiFePO4 Biphasic Systems in Aqueous and Non-aqueous Electrolytes |
| title_full_unstemmed | Phase Transition Kinetics of LiFePO4 Biphasic Systems in Aqueous and Non-aqueous Electrolytes |
| title_short | Phase Transition Kinetics of LiFePO4 Biphasic Systems in Aqueous and Non-aqueous Electrolytes |
| title_sort | phase transition kinetics of lifepo4 biphasic systems in aqueous and non aqueous electrolytes |
| topic | phase transition biphasic materials aqueous and non-aqueous systems avrami plot |
| url | https://www.jstage.jst.go.jp/article/electrochemistry/92/2/92_23-00138/_html/-char/en |
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