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Citation: WU Ying-Lei, YANG Jun, WANG Jiu-Lin, YIN Li-Chao, NULI Yan-Na. Composite Cathode Structure and Binder for High Performance Lithium-Sulfur Battery[J]. Acta Physico-Chimica Sinica, ;2010, 26(02): 283-290. doi: 10.3866/PKU.WHXB20100205 shu

Composite Cathode Structure and Binder for High Performance Lithium-Sulfur Battery

1.
Department of Chemical Engineering, Shanghai Jiaotong University, Shanghai 200240, P. R. China

Received Date: 27 July 2009
Available Online: 16 December 2009

Ball milling in combination with heat treatment was used to prepare sulfur-based composite cathode materials incorporating multi-walled carbon nanotubes (MCNTs) for Li-S battery. The structure and morphology of the as-prepared cathode materials were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The effect of MCNT content and binder type on the capacity, cyclability and self-discharge behavior of a sulfur-based cathode were systematically investigated. Results show that the appropriate amount of MCNTs is 5%-8% (w, mass fraction) and the use of β-cyclodextrin as a water-soluble binder to fabricate the cathode results in the best electrochemical performance. When the Li-S battery was half charged at room temperature, there was almost no self-discharge during storage for 30 d. The charging capacity was 687.7 mAh·g-1 during the 1st cycle and 623.8 mAh·g-1 during the 100th cycle for the cathode at a current rate of 0.1C. Therefore, 90.7%of the capacity was retained.
- Li-S battery,
- Sulfur-based cathode,
- MCNTs,
- Water-soluble binder,
- Cyclodextrin
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