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Thermoelectrochemical cells based on Li+/Li redox couples in LiFSI glyme electrolytes

Title
Thermoelectrochemical cells based on Li+/Li redox couples in LiFSI glyme electrolytes
Authors
Kim, KyungguLee, Hochun
DGIST Authors
Lee, Hochun
Issue Date
2018-09
Citation
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 20(36), 23433-23440
Type
Article
Article Type
Article
Keywords
THERMO-ELECTROCHEMICAL CELLLITHIUM-ION BATTERIESTHERMOGALVANIC CELLSAPROTIC-SOLVENTSNANOTUBEPOWERASSOCIATIONELECTRODESSOLVATIONSTABILITY
ISSN
1463-9076
Abstract
Thermoelectrochemical cells (TECs) provide conspicuous advantages, including a high Seebeck coefficient (S-e), design flexibility, and low cost compared with conventional thermoelectric devices. Here, we investigated TECs employing Li metal electrodes (Li-TECs) and a series of glyme (CH3O[CH2CH2O]nCH(3), n = 1-4, nG) solvents with 0.5-3.0 M lithium-imide salts (lithium bis [fluorosulfonyl] imide, LiFSI, and lithium bis[trifluoromethane sulfonyl] imide, LiTFSI). The S-e value and power performance of Li-TECs markedly depend on the nature of glyme solvents and Li salt concentration. The dependency of S-e on the solvation structure of the Li-ions is examined via Raman measurements, and the internal resistance of Li-TECs is analyzed using electrochemical impedance spectroscopy. Notably, a Li-TEC with 1.0 M LiFSI 1G displays about two times higher power density and about eight times higher conversion efficiency than a conventional Cu-TEC utilizing aqueous electrolytes, which is ascribed to the high S-e value and low thermal conductivity of the former. In addition, for a Li-TEC with 1.0 M LiFSI 1G, the low-temperature performance is examined to assess its practical feasibility.
URI
http://hdl.handle.net/20.500.11750/9393
DOI
10.1039/c8cp03155j
Publisher
ROYAL SOC CHEMISTRY
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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