A Novel Silicon/Carbon Composite Film as Anode Material for Lithium-Ion Secondary Battery

Acta Scientiarum Naturalium Universitatis Pekinensis

A Novel Silicon/Carbon Composite Film as Anode Material for Lithium-Ion Secondary Battery

ZHAO Zhongqin^{1, 3)}, WU Zhongyou¹⁾, YANG Wubao²⁾, LIU Xin¹⁾, JIANG Weijun¹⁾
(¹⁾CITIC Guoan Mengguli New Energy Technology Co., Ltd., Beijing, 102200; ²⁾Faculty of Mechanical

Received:2006-09-18 Online:2006-12-30 Published:2006-12-30

一种新型硅碳复合薄膜材料作为锂离子二次电池负极材料的研究

赵中琴^{1, 3)}, 吴中友¹⁾, 杨武保²⁾, 刘鑫¹⁾, 江卫军¹⁾
(¹⁾中信国安盟固利新能源科技有限公司, 北京, 102200; ²⁾石油大学机电学院, 北京, 102249; ³⁾通讯作者, E-mail: zhaozq_bj@sina.com)

Abstract

Abstract: Silicon-carbon composite film was prepared with vapor deposition technology. The measurements of XRD and Raman spectroscopy indicate that the Si_xC_y/C composite film has nano-microcrystalline structure. The results of electrochemical test indicate that the Si_xC_y/C composite film deposited on Cu foil has low plateau during charge and discharge (below 0.5V vs. Li⁺/Li), the corresponding discharge capacity reaches 1200mAh/g, and the capacity retention is 85% after 200 cycles. The improvement of the electrochemical performance of the Si_xC_y/C composite film contributes to the buffer framework and doping C element, which improves the conductivity of the composite and effectively buffer the volume change induced by Li insertion/extraction.

Key words: Si_xC_y/C composite film, vapor deposition, anode material, lithium ion secondary battery

摘要： 利用气相沉积技术,制备了Si_xC_y层和C层相间的硅碳复合薄膜材料。XRD测试和Raman光谱测试表明, 该硅碳复合薄膜材料具有纳米微晶结构。电化学性能测试表明，该Si_xC_y/C复合薄膜材料,具有较低的充放电平台(0.5V以下), 对应的首次放电容量达1200mAh/g以上, 经过200次循环, 容量保持率高于85%。Si_xC_y/C复合薄膜材料性能的改善,主要原因可能源于活性材料Si中的缓冲骨架以及碳的共同作用,它们的存在改善了复合材料的导电性能,也有效缓冲了在充放电过程中活性组分Si所导致的体积变化。

关键词: Si_xC_y/C复合薄膜材料, 气相沉积, 负极材料, 锂离子二次电池负极材料

CLC Number:

O646

ZHAO Zhongqin^{1, 3)}, WU Zhongyou¹⁾, YANG Wubao²⁾, LIU Xin¹⁾, JIANG Weijun¹⁾
(¹⁾CITIC Guoan Mengguli New Energy Technology Co., Ltd., Beijing, 102200; ²⁾Faculty of Mechanical . A Novel Silicon/Carbon Composite Film as Anode Material for Lithium-Ion Secondary Battery[J]. Acta Scientiarum Naturalium Universitatis Pekinensis.

赵中琴^{1, 3)}, 吴中友¹⁾, 杨武保²⁾, 刘鑫¹⁾, 江卫军¹⁾
(¹⁾中信国安盟固利新能源科技有限公司, 北京, 102200; ²⁾石油大学机电学院, 北京, 102249; ³⁾通讯作者, E-mail: zhaozq_bj@sina.com). 一种新型硅碳复合薄膜材料作为锂离子二次电池负极材料的研究[J]. 北京大学学报（自然科学版）.

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https://xbna.pku.edu.cn/EN/Y2006/V42/I7/39

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