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Highly rough copper current collector: improving adhesion property between a silicon electrode and current collector for flexible lithium-ion batteries

Title
Highly rough copper current collector: improving adhesion property between a silicon electrode and current collector for flexible lithium-ion batteries
Authors
Jeon, HyunkyuCho, InseongJo, HearinKim, KyumanRyou, Myung-HyunLee, Yong Min
DGIST Authors
Lee, Yong Min
Issue Date
2017
Citation
RSC Advances, 7(57), 35681-35686
Type
Article
Article Type
Article
Keywords
AdhesionAdhesion PropertiesAnodesBindersCross Sectional Sem ImageCurrent CollectorDischarge CapacitiesElectric BatteriesElectric Current CollectorsElectric DischargesElectrodesHigh Energy DensitiesInterfaces (Materials)Interfacial Adhesion StrengthInterfacial AdhesionsLithium Ion BatteriesLithium CompoundsMetal CladdingNegative ElectrodesPerformancePolymerRechargeable BatteriesSiliconSilicon BatteriesSilicon ElectrodeSurface
ISSN
2046-2069
Abstract
Two types of Cu foil, conventional flat Cu foil and rough Cu foil, are used to fabricate silicon (Si) electrodes for flexible and high-energy-density lithium-ion batteries (LIBs). Confocal microscopy and cross-sectional SEM images reveal the roughness of the very rough Cu foil to be approximately 3 μm, whereas the conventional flat Cu foil has a smooth surface and a roughness of less than 1 μm. This difference leads to the improvement of the interfacial adhesion strength between the Si electrode and the Cu foil from 89.7 (flat Cu foil) to 135.7 N m-1 (rough Cu foil), which is measured by a versatile peel tester. As a result, the Si electrode with high Si content (80 wt%) can deliver a significantly higher discharge capacity of 1500 mA h g-1 after 200 cycles, even at a current rate of 1200 mA g-1. Furthermore, when the corresponding Si electrode is assembled into a pouch-type cell and cycled in the rolled conformation with a radius of 6.5 mm, the Si electrode with rough Cu foil shows a stable cycle performance due to better interfacial adhesion. © 2017 The Royal Society of Chemistry.
URI
http://hdl.handle.net/20.500.11750/4729
DOI
10.1039/c7ra04598k
Publisher
Royal Society of Chemistry
Related Researcher
Files:
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Collection:
Energy Science and EngineeringETC1. Journal Articles


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