钒替代对碳包覆硅酸铁锂复合材料结构的影响（英文）

doi:10.13208/j.electrochem.130356

电化学（中英文） ›› 2013, Vol. 19 ›› Issue (6): 565-570. doi: 10.13208/j.electrochem.130356

• 锂离子电池近期研究专辑 (厦门大学杨勇教授主编) • 上一篇下一篇

钒替代对碳包覆硅酸铁锂复合材料结构的影响（英文）

杨洪¹，张颖^1,2，程璇^1,2*

1. 厦门大学材料学院，材料科学与工程系，厦门 361005；2. 福建省特种先进材料重点实验室，厦门 361005

收稿日期:2013-05-16 修回日期:2013-07-08 出版日期:2013-12-28 发布日期:2013-12-23
通讯作者: 程璇 E-mail:xcheng@xmu.edu.cn
基金资助:
Supported by Fujian Key Laboratory of Advanced Materials, China (No. 2006L2003).

Effect of Vanadium Substitution on Structure of Li₂FeSiO₄/C Composites

YANG Hong¹, ZHANG Ying^1,2, CHENG Xuan^1,2*

1. Department of Materials Science & Engineering, College of Materials; 2. Fujian Key Laboratory of Advanced Materials, Xiamen University, Xiamen, Fujian 361005, P.R. China

Received:2013-05-16 Revised:2013-07-08 Published:2013-12-28 Online:2013-12-23
Contact: CHENG Xuan E-mail:xcheng@xmu.edu.cn
Supported by:
Supported by Fujian Key Laboratory of Advanced Materials, China (No. 2006L2003).

摘要/Abstract

摘要： 以廉价的硝酸铁为铁原料，通过溶胶凝胶和固相反应法制得碳包覆硅酸铁锂(Li₂FeSiO₄/C)正极材料，以偏钒酸铵(NH4VO3)为钒原料，按理论计算量5，10，15，20，25，30和50%制得钒替代Li₂FeSiO₄/C复合材料（Li₂Fe_1-xV_xSiO₄/C）. 结果表明，Li₂FeSiO₄/C(主相P21/n)结晶良好，基本无杂相，而Li₂Fe_1-xV_xSiO₄/C(主相P21/n)存在主要杂质偏硅酸锂和钒/铁氧化物. Li₂FeSiO₄/C和Li₂Fe_0.95V_0.5SiO₄/C电极C/16(室温)的首次放电比容量分别达160.9 mAh·g^-1和130.8 mAh·g^-1. 钒替代量的增加，无定形碳的石墨化程度增强，碳包覆量却减少. 钒替代量直接影响钒/铁氧化物的形成量，导致Li₂Fe_0.95V_0.5SiO₄/C电极电化学性能较差.

关键词: 硅酸铁锂, 钒取代, 正极材料, 锂离子电池

Abstract: The carbon coated lithium iron silicate (Li₂FeSiO₄/C) composites were prepared using less expansive iron starting material of soluble ferric nitrate through sol-gel process and solid state reaction. The theoretically calculated amounts of 5, 10, 15, 20, 25, 30, and 50% of vanadium (V) were introduced using NH₄VO₃ to obtain V-substituted Li2FeSiO4/C composites. It was found that the pure Li₂FeSiO₄/C composite exhibited a good crystallinity with P21/n and nearly no impurities being detected, while the V-substituted Li₂FeSiO₄/C composites showed major impurities of Li₂SiO₃ and V₃O₄/Fe₃O₄. The discharge capacities of 160.9 mAh·g^-1 and 130.8 mAh·g^-1 at C/16 were obtained for the pure and 5% V-substituted Li₂FeSiO₄/C composites, respectively. The degree of graphitization in amorphous carbon was enhanced and the quantities of carbon coated were lowered with the increase of V-substituted amounts. The electrochemical performance of 5% V-substituted Li₂FeSiO₄/C composite was not improved due to the presences of impurities which were directly linked to the amounts of V substitution.

Key words: lithium iron silicates, vanadium substitution, cathode materials, lithium ion battery

中图分类号:

O646

杨洪，张颖，程璇*. 钒替代对碳包覆硅酸铁锂复合材料结构的影响（英文）[J]. 电化学（中英文）, 2013, 19(6): 565-570.

YANG Hong, ZHANG Ying, CHENG Xuan*. Effect of Vanadium Substitution on Structure of Li₂FeSiO₄/C Composites[J]. Journal of Electrochemistry, 2013, 19(6): 565-570.

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钒替代对碳包覆硅酸铁锂复合材料结构的影响（英文）

Effect of Vanadium Substitution on Structure of Li₂FeSiO₄/C Composites

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钒替代对碳包覆硅酸铁锂复合材料结构的影响（英文）

Effect of Vanadium Substitution on Structure of Li2FeSiO4/C Composites

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Effect of Vanadium Substitution on Structure of Li₂FeSiO₄/C Composites