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Toward Fast Operation of Lithium Batteries: Ion Activity as the Factor To Determine the Concentration Polarization

Title
Toward Fast Operation of Lithium Batteries: Ion Activity as the Factor To Determine the Concentration Polarization
Authors
Kim, Dong-HuiHwang, SunwookCho, Jeong-JuYu, SunghoonKim, SoojinJeon, JonghoAhn, Kyoung HoLee, ChulhaengSong, Hyun-KonLee, Hochun
DGIST Authors
Lee, Hochun
Issue Date
2019-06
Citation
ACS Energy Letters, 4(6), 1265-1270
Type
Article
Article Type
Article
Keywords
COMPUTER-SIMULATIONSPOLYMER ELECTROLYTESLIQUID ELECTROLYTESTRANSFERENCE NUMBERIMPEDANCE RESPONSEINTERCALATIONCOORDINATIONASSOCIATIONELECTRODESSOLVATION
ISSN
2380-8195
Abstract
The concentration polarization, in addition to the activation and ohmic polarizations, limits the fast operation of electrochemical cells such as Li-ion batteries (LIBs). We demonstrate an approach to mitigate the concentration polarization by regulating the effective concentration (i.e., the mean ionic activity) of Li ions. The use of an acrylate-based gel polymer electrolyte (A-GPE) improved the rate capability of LIBs compared with its liquid counterpart. Electrochemical and spectroscopic evidence confirms that the unexpected power performance of the A-GPE is ascribed to the unique solvation structure surrounding the Li ions. The solvation structure suppresses an abnormal increase in the activity of Li ions and thus mitigates the concentration polarization during high-rate discharge. Importantly, this study rejects the common wisdom that the solid or semisolid electrolytes discourage the fast charge/discharge of LIBs and suggests an avenue to simultaneously enhance both the safety and high-power performance of rechargeable batteries. © 2019 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/10100
DOI
10.1021/acsenergylett.9b00724
Publisher
American Chemical Society
Related Researcher
  • Author Lee, Hochun Electrochemistry Laboratory for Sustainable Energy(ELSE)
  • Research Interests Lithium-ion batteries; Novel Materials for rechargeable batteries; Novel energy conversion;storage systems; Electrochemistry; 리튬이차전지; 이차전지용 신규 전극 및 전해액; 신규 에너지변환 및 저장 시스템; 전기화학
Files:
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Collection:
Department of Energy Science and EngineeringElectrochemistry Laboratory for Sustainable Energy(ELSE)1. Journal Articles


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