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Preparation and Application of High Capacity Silicon/Carbon Composite Material

Author: YangWanGuang
Tutor: YinGePing
School: Harbin Institute of Technology
Course: Chemical Engineering and Technology
Keywords: Lithium-ion battery Si/C composite Pyrolysis Water-binder
CLC: TM912.9
Type: Master's thesis
Year: 2008
Downloads: 108
Quote: 1
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Abstract


The Si/C composite was obtained by pyrolyzing pitch at 900℃in this paper. The microstructure and electrochemical performance of the composites were characterized by X-ray diffraction (XRD), scanning electron micrograph (SEM) and electrochemical methods.The method by grinding graphite in advance was chosen to prepare the Si/C composite, which can improve the cycling performance and first efficiency of the composite. It is founded that the composite with graphite ground, which has the first efficiency of 80.5%, the first reversible capacity of 695.7mAh·g-1 and remain 263.1mAh·g-1 after 80 cycles, shows the better performance. While the composite without graphite ground, which has the first efficiency of 72.5%, and remain 191.7mAh·g-1 after 80 cycles.The method by reducing the content of the Si can improve the cyclling performance of the composite. The composites showed better performance with the capacity retention of 57.5% at the composites of 20mass% Si and 40mass% graphite within 40th cycles, while the composites of 25mass% Si and 25mass% graphite owned the capacity retention of 47.9%.When MAG was chosed to prepare Si/C composite, it was found that the electrode fabricated by Water-binder showed better performance with the capacity retention of 62% within 100th cycles. The comparison between PVDF-binder and Water-binder was studied showed that Water-binder showed better performance with the capacity retention of 80.3% within 40th cycles, while PVDF-binder owned the capacity retention of 59.1%.The full cells were produced by the composite using MAG and Water-binder when carrying through industrial application. The comparison between MAG and Si/C composite containing tap density, pressing density, and the average voltage of discharge was studied. The composite has the tap density of 0.64g·cm-3 and the pressing density of 1.35g·cm-3. The average discharge voltage of cell using Si/C is 3.5V, and the cutoff voltage is from 2.7 to 4.2V.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Battery > A variety of materials, battery
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