Carbon-Coated Current Collectors for High-Power Li-Ion Secondary Batteries
Abstract
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 20-m 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 29, 2012
- Accession Number
- ADA567230
Entities
People
- Nae-lih Wu
Organizations
- National Taiwan University