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Highly rough copper current collector: improving adhesion property between a silicon electrode and current collector for flexible lithium-ion batteries
- Highly rough copper current collector: improving adhesion property between a silicon electrode and current collector for flexible lithium-ion batteries
- Jeon, Hyunkyu; Cho, Inseong; Jo, Hearin; Kim, Kyuman; Ryou, Myung-Hyun; Lee, Yong Min
- DGIST Authors
- Lee, Yong Min
- Issue Date
- RSC Advances, 7(57), 35681-35686
- Article Type
- Adhesion; Adhesion Properties; Anodes; Binders; Cross Sectional Sem Image; Current Collector; Discharge Capacities; Electric Batteries; Electric Current Collectors; Electric Discharges; Electrodes; High Energy Densities; Interfaces (Materials); Interfacial Adhesion Strength; Interfacial Adhesions; Lithium Ion Batteries; Lithium Compounds; Metal Cladding; Negative Electrodes; Performance; Polymer; Rechargeable Batteries; Silicon; Silicon Batteries; Silicon Electrode; Surface
- 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.
- Royal Society of Chemistry
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