Improving Electrochemical Performance at Graphite Negative Electrodes in Concentrated Electrolyte Solutions by Addition of 1,2-Dichloroethane

In concentrated propylene carbonate (PC)-based electrolyte solutions, reversible lithium intercalation and de-intercalation occur at graphite negative electrodes because of the low solvation number. However, concentrated electrolyte solutions have low ionic conductivity due to their high viscosity,...

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Main Authors: Hee-Youb Song, Moon-Hyung Jung, Soon-Ki Jeong
Format: Article
Language:English
Published: MDPI AG 2019-11-01
Series:Applied Sciences
Subjects:
Online Access:https://www.mdpi.com/2076-3417/9/21/4647
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author Hee-Youb Song
Moon-Hyung Jung
Soon-Ki Jeong
author_facet Hee-Youb Song
Moon-Hyung Jung
Soon-Ki Jeong
author_sort Hee-Youb Song
collection DOAJ
description In concentrated propylene carbonate (PC)-based electrolyte solutions, reversible lithium intercalation and de-intercalation occur at graphite negative electrodes because of the low solvation number. However, concentrated electrolyte solutions have low ionic conductivity due to their high viscosity, which leads to poor electrochemical performance in lithium-ion batteries. Therefore, we investigated the effect of the addition of 1,2-dichloroethane (DCE), a co-solvent with low electron-donating ability, on the electrochemical properties of graphite in a concentrated PC-based electrolyte solution. An effective solid electrolyte interphase (SEI) was formed, and lithium intercalation into graphite occurred in the concentrated PC-based electrolyte solutions containing various amounts of DCE, while the reversible capacity improved. Raman spectroscopy results confirmed that the solvation structure of the lithium ions, which allows for effective SEI formation, was maintained despite the decrease in the total molality of LiPF<sub>6</sub> by the addition of DCE. These results suggest that the addition of a co-solvent with low electron-donating ability is an effective strategy for improving the electrochemical performance in concentrated electrolyte solutions.
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spelling doaj.art-19be73555d104de1ad4a4a8d6075215b2022-12-21T18:29:07ZengMDPI AGApplied Sciences2076-34172019-11-01921464710.3390/app9214647app9214647Improving Electrochemical Performance at Graphite Negative Electrodes in Concentrated Electrolyte Solutions by Addition of 1,2-DichloroethaneHee-Youb Song0Moon-Hyung Jung1Soon-Ki Jeong2Department of Energy Systems, Soonchunhyang University, Asan, Chungnam 31538, KoreaVITZROCELL Co., Ltd., 70, Indeoseupakeu, Hapdeok, Dangjin, Chungnam 31816, KoreaDepartment of Energy Systems, Soonchunhyang University, Asan, Chungnam 31538, KoreaIn concentrated propylene carbonate (PC)-based electrolyte solutions, reversible lithium intercalation and de-intercalation occur at graphite negative electrodes because of the low solvation number. However, concentrated electrolyte solutions have low ionic conductivity due to their high viscosity, which leads to poor electrochemical performance in lithium-ion batteries. Therefore, we investigated the effect of the addition of 1,2-dichloroethane (DCE), a co-solvent with low electron-donating ability, on the electrochemical properties of graphite in a concentrated PC-based electrolyte solution. An effective solid electrolyte interphase (SEI) was formed, and lithium intercalation into graphite occurred in the concentrated PC-based electrolyte solutions containing various amounts of DCE, while the reversible capacity improved. Raman spectroscopy results confirmed that the solvation structure of the lithium ions, which allows for effective SEI formation, was maintained despite the decrease in the total molality of LiPF<sub>6</sub> by the addition of DCE. These results suggest that the addition of a co-solvent with low electron-donating ability is an effective strategy for improving the electrochemical performance in concentrated electrolyte solutions.https://www.mdpi.com/2076-3417/9/21/4647solid electrolyte interphaselithium-graphite intercalation compoundsconcentrated electrolyte solutionslithium-ion batteriessolvation structures
spellingShingle Hee-Youb Song
Moon-Hyung Jung
Soon-Ki Jeong
Improving Electrochemical Performance at Graphite Negative Electrodes in Concentrated Electrolyte Solutions by Addition of 1,2-Dichloroethane
Applied Sciences
solid electrolyte interphase
lithium-graphite intercalation compounds
concentrated electrolyte solutions
lithium-ion batteries
solvation structures
title Improving Electrochemical Performance at Graphite Negative Electrodes in Concentrated Electrolyte Solutions by Addition of 1,2-Dichloroethane
title_full Improving Electrochemical Performance at Graphite Negative Electrodes in Concentrated Electrolyte Solutions by Addition of 1,2-Dichloroethane
title_fullStr Improving Electrochemical Performance at Graphite Negative Electrodes in Concentrated Electrolyte Solutions by Addition of 1,2-Dichloroethane
title_full_unstemmed Improving Electrochemical Performance at Graphite Negative Electrodes in Concentrated Electrolyte Solutions by Addition of 1,2-Dichloroethane
title_short Improving Electrochemical Performance at Graphite Negative Electrodes in Concentrated Electrolyte Solutions by Addition of 1,2-Dichloroethane
title_sort improving electrochemical performance at graphite negative electrodes in concentrated electrolyte solutions by addition of 1 2 dichloroethane
topic solid electrolyte interphase
lithium-graphite intercalation compounds
concentrated electrolyte solutions
lithium-ion batteries
solvation structures
url https://www.mdpi.com/2076-3417/9/21/4647
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AT soonkijeong improvingelectrochemicalperformanceatgraphitenegativeelectrodesinconcentratedelectrolytesolutionsbyadditionof12dichloroethane