서지주요정보
Development of core components for vanadium redox flow batteries (VRFB) using composite materials = 복합재료를 응용한 바나듐 레독스 흐름전지 핵심 부품 개발
서명 / 저자 Development of core components for vanadium redox flow batteries (VRFB) using composite materials = 복합재료를 응용한 바나듐 레독스 흐름전지 핵심 부품 개발 / Jaeheon Choe.
발행사항 [대전 : 한국과학기술원, 2017].
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등록번호

8030919

소장위치/청구기호

학술문화관(문화관)B1층 보존서고

DME 17036

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초록정보

The vanadium redox flow battery (VRFB) is a type of energy storage system (ESS) that stores surplus energy during times of low demand and delivers it during peak periods. It enables load leveling when the supply of electric power is unstable, which may improve the efficiency of the use of electricity. The major advantages of the VRFB are its non-explosive nature, its scalability with respect to storage capacity and power, its long lifetime, and the recyclability of its components. Therefore, the VRFB has replaced other ESSs, such as lithium-ion batteries, and the interest in VRFBs has increased rapidly. In this dissertation, to improve the performance and reliability of the VRFB system, the core components of the VRFB have been developed using a carbon composite, which has superior electrical and mechanical properties compared to conventional materials.

바나듐 레독스 흐름전지 (Vanadium redox flow battery, VRFB)는 에너지 저장 시스템 (Energy storage system, ESS)의 한 종류로, 잉여 전력을 저장하여 전력 공급이 불안정 하거나 첨두부하 시에 부하 평준화 (Load leveling)를 하여 전력 사용 효율을 개선할 수 있는 장치이다. 특히, 화재나 폭발에 대한 안정성과, 출력과 용량의 독립적인 설계가 가능하다는 점, 긴 수명과 전해액 재활용이 가능하다는 장점으로 인하여 다른 에너지 저장 시스템에 비하여 발전 가능성이 높고 각광을 받고 있다. 본 학위논문에서는 기계 물성과 전기적 성능이 우수한 탄소섬유 복합재료를 이용한 바나듐 레독스 흐름전지 핵심 부품을 개발하여 시스템 성능 및 안정성 향상에 대한 연구를 수행하였다.

서지기타정보

서지기타정보
청구기호 {DME 17036
형태사항 v, 122 p. : 삽화 ; 30 cm
언어 영어
일반주기 저자명의 한글표기 : 최재헌
지도교수의 영문표기 : Jinwhan Kim
지도교수의 한글표기 : 김진환
공동지도교수의 영문표기 : Dai Gil Lee
공동지도교수의 한글표기 : 이대길
수록잡지명 : "Shape optimization of the corrugated composite bipolar plate (CCBP) for vanadium redox flow batteries (VRFBs)". Composite Structures, v.158, pp.333-339(2016)
수록잡지명 : "Durability of graphite coated carbon composite bipolar plates for vanadium redox flow batteries". Composite Structures, v.134, pp.106-113(2015)
학위논문 학위논문(박사) - 한국과학기술원 : 기계공학과,
서지주기 References : p. 99-109
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Schematic diagrams oftheVRFB: (a) awholesystem; (b) asinglecell.

Properties of the carbon felt electrode

Ohmic loss per unit area W.r. t. the amplitude of corrugation and the average fiber volume fraction Vf

Pumpingloss per unit area W.r.t. the amplitude ofcorrugation and the average fiber volume fraction Vf

Sum of ohmic and pumping losses per unit area W. I. t. the amplitude ofcorrugation and the average fiber volume fraction Vf

Propertiesofplain weave carbon/epoxyprepreg(WSN1k, SK Chemical ofKorea)

Schematic illustration of thepurpose of the CCBP.

Schematicillustration oftheASR measurementequipment.

Measured properties of carbon felt W. r. t. the fiber volume fraction: (a) ASR and

Schematicillustration oftheflowtestequipmentfor carbon felt

Schematic diagram of the calculation model for the permeability and ASR using

Results of the calculations: (a) ASR; (b) permeability W. r. t the amplitude of

Results of theloss calculations: (a) ohmicloss; (b) pumpingloss perunitarea W.r.t

Sum of ohmic and pumping losses perunit area W. r. t the amplitude of comugation

Process forfabricating the CCBP specimen.

Photographs of thefabricated CCBP specimen

Areal specific resistances ofthe carbon feltelectrode with and withoutthe CCBP.

Measured permeabilities ofthe carbon feltelectrode with and withoutthe CCE

Sum or pumping and ohmic TOSSES per unit area W. r. t the amplitude a OI the comugation and theaveragefibervolumefractionVratthe cunrent density of1000A/m2 [Units: W/m2]

Sum of pumping and ohmic losses per unit area W. I. t. the amplitude a of the corrugation and the average fiber volume fraction Vfat the current density of2000 A/m2

Mechanical properties of unidirectional carbon/epoxy compon Chemicals, RepublicofKorea)

Schematic diagram of the uncontacted area between the CCBP and carbon felt

Results of the charge/discharge test with respectto the flow velocity at the current densityof(a) 1000A/m; (b) 2000A/m2.

Sumof pumping and ohmiclosses withrespect.to theamplitude ofthecomugationa atthecurrentdensityof(a) 1000A/mr; (b) 2000A/m2.

FEA model to determine the wavelengthi2 of thecomugation oftheCCBP.

Displacementiny-direction ofcarbonfeltvithrespectitothewavelength.: (a) 20 mm; (b) 40mm; (c) 60mm.

FEA model to determine the thickness of the CCBP: (a) boundary conditions; (b) exampleofaresult.

Calculated 6 withrespect.to the thickness ofthe CCBPby FEA.

Properties of thegraphitefoils

Measured permeability of thegraphitefoils

Average mass loss rate perunit area of the graphitefoils

Yougsmodulus of thepyrolyticgraphitefoils with differentporosities

Schematic illustration of theexperimental setupfortheelectro-Chemical agingtest.

Masslossperunitareawithrespectiootime: (a) vanousgraphitesamples; (b)pyrolyt

SEM images: (a) pyrolytic graphite before aging and (b) after aging; (c) expanded

Schematic illustration of thefabrication of aBP.

Schematicillustration ofthe experimental setupfortheresistance measurement.

MeasuredASR of (a) graphiteand (b) the BP.

ASRofgraphite and theBP atthe compaction pressureof0.05MPa

Schematic illustration of the Hertzian contact model ofthe compositeBP.

ASR ofthe BP withrespectito themodulus of graphiteEG withthelineartrendline.

Representative charge/discharge curve of the singlecell test

Schematic diagram of the uncontacted area due to the bending deformation of the

Fabrication process of theco-cured specimen.

Maximum height of thesurface profileR.

Experimenta setup to measure theASR of the specimen

ASRs ofthespecimens with.respectto Rt.

SEMimageofthesufface.ofcopperafter20MPaof pressure was appliedwith carbon

ASRs of thespecimens withrespectto the curingpressure

ASRs of the BP and BP-integrated CC at a compaction pressure of 0.05 MPa witl

Interfacial contactresistancebetweenthecopperandcarboncompositewithrespectito

Ratio r oftheinterfacial contactresistance to theASR.

Specimen configuration ofthesingle-lap sheartest

Resultof the single-lap sheartest.

Photographs of thefracture surface afterthe test.