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Accession Number
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ADA567230
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Title
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Carbon-Coated Current Collectors for High-Power Li-Ion Secondary Batteries.
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Publication Date
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Aug 2012
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Media Count
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10p
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Personal Author
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N. Wu
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Abstract
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The ultimate goal of this project is to develop a viable C-coating process of the current collector to improve the overall power performance of the electrode of Li-ion batteries. During this period, study was focused onto the development of a low-temperature chemical vapor deposition (PA-CVD) process for C deposition. The PA-CVD vacuum chamber was set-up. The researchers completed the investigation of the effects of the processing parameters; the characteristics of the C layer will be studied later. The surface properties of the C layer, including morphology, surface roughness and composition, were characterized with several surface analysis techniques including X-ray photoelectron spectroscopy, scanning electron microscopy (SEM), and atomic force microscopy (AFM). A rather uniform thin layer of C-coating was achieved on 20m thick Al foil under continuous deposition conditions. Surface analysis indicated that this thin C layer does not contain an interfacial Al- carbide layer. LiFePO4 electrode using this C-coated Al current collector exhibits higher capacity under 10 C rate and much more the cycle life under the 2C-charge/5C-discharge cycling, as compared with its counter-part without the C coating.
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Keywords
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Capacity(Quantity)
Carbon
Carbon-coated current collectors
Chemical vapor deposition
Coatings
Deposition
Electrodes
Electron microscopy
Foils(Materials)
Lithium batteries
Lithium ion batteries
Lithium ion secondary battery
Morphology
Parameters
Scanning electron microscopes
Surface properties
Surface roughness
X ray photoelectron spectroscopy
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Source Agency
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Non Paid ADAS
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NTIS Subject Category
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99D - Basic & Synthetic Chemistry
97M - Batteries & Components
71E - Coatings, Colorants, & Finishes
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Corporate Author
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National Taiwan Univ., Taipei.
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Document Type
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Technical report
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Title Note
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Final rept. 30 Aug 2011-20 Aug 2012.
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NTIS Issue Number
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1308
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Contract Number
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FA2386-11-1-4100
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