| 硅基复合材料的电化学特性 |
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| 引用本文： | 徐欣欣,杨军. 硅基复合材料的电化学特性[J]. 电化学, 2009, 15(1): 47-51. DOI: 10.61558/2993-074X.1953 |
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| 作者姓名： | 徐欣欣 杨军 |
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| 作者单位： | 上海交通大学化学化工学院,上海,200240;上海交通大学化学化工学院,上海,200240 |
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| 基金项目： | 国家高技术研究发展计划(863计划)，上海市基础研究重点基金 |
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| 摘 要： | 将氧化亚硅,铝和石墨经过2步球磨盐酸刻蚀处理,再包覆碳,可制得纳米孔-S i/G/C复合材料,其比容量高达600 mAh/g,电化学循环性能稳定,但首次放电效率较低.氧化亚硅和铝球磨后再经高温热处理,可以促使氧化亚硅完全还原.高温下A l2O3产物的晶型结构由γ相转为稳定难溶的α相,硅/A l2O3复合材料难以刻蚀制孔,而硅/A l2O3/G/C复合材料则显示较高的首次放电效率但循环稳定性较差.
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| 关 键 词： | 多孔硅 热处理 负极材料 锂离子电池 |
| 收稿时间： | 2009-02-28 |
Electrochemical Characteristics of Silicon-based Composites |
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| XU Xin-xin,YANG Jun. Electrochemical Characteristics of Silicon-based Composites[J]. Electrochemistry, 2009, 15(1): 47-51. DOI: 10.61558/2993-074X.1953 |
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| Authors: | XU Xin-xin YANG Jun |
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| Affiliation: | School of Chemistry of Chemical Engineering;Shanghai Jiao Tong University;Shanghai 200240;China |
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| Abstract: | The nano-porous Si/G/C composite was obtained by two-step ball milling with SiO,A1 and graphite,along with HCl acid etching followed by carbon incorparation.This composite demonstrated the reversible capacity of 600 mAh/g with excellent cycling stability,but low initial cycle efficiency is low.A high-temperature treatment after ball-milling of SiO and A1 could promote the complete reduction of SiO.However,the crystalline structure of Al2O3 product changed from γ-phase to α-phase,which it can no longer be etched by HCl.The Si/Al2O3/G/C composite exhibited higher efficiency at the first cycle but relatively poorer cyclability. |
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| Keywords: | nano-porous Si heat treatment anode material lithium ion battery |
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