| 锂离子电池正极材料Li2FeSiO4的改性 |
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| 引用本文： | 曹璇,郭华军,李向群,张宝,李新海,王志兴,彭文杰.锂离子电池正极材料Li2FeSiO4的改性[J].中南大学学报(自然科学版),2012,43(1):23-27. |
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| 作者姓名： | 曹璇 郭华军 李向群 张宝 李新海 王志兴 彭文杰 |
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| 作者单位： | 中南大学冶金科学与工程学院,湖南长沙,410083 |
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| 基金项目： | 国家重点基础研究发展计划(“973”计划)项目(2007CB613607) |
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| 摘 要： | 采用高温固相反应法在氩气气氛下合成锂离子电池正极材料Li2FeSiO4、Li2FeSiO4/C和Li2Fe0.9Mn0.1SiO4/C,并采用X线衍射、扫描电镜和电化学方法研究材料的结构与性能.研究结果表明:改性后的Li2FeSiO4/C和Li2Fe0.9Mn0.1SiO4/C材料与Li2FeSiO4具有相同的晶体结构,锰离子掺杂和表面碳包覆有效地提高了材料的比容量和循环性能.以C/16倍率充放电,Li2FeSiO4/C的首次放电容量为112mA·h/g,Li2Fe0.9Mn0.1SiO4/C材料首次放电容量达122 mA·h/g,充放电循环30次后容量衰减仅为9％.
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| 关 键 词： | 锂离子电池 正极 硅酸铁锂 碳包覆 锰掺杂 |
Modification of Li2FeSiO4 cathode for lithium-ion batteries |
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| CAO Xuan
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GUO Hua-jun
,
LI Xiang-qun
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ZHANG Bao
,
LI Xin-hai
,
WANG Zhi-xing
,
PENG Wen-jie.Modification of Li2FeSiO4 cathode for lithium-ion batteries[J].Journal of Central South University:Science and Technology,2012,43(1):23-27. |
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| Authors: | CAO Xuan GUO Hua-jun LI Xiang-qun ZHANG Bao LI Xin-hai WANG Zhi-xing PENG Wen-jie |
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| Affiliation: | (School of Metallurgical Science and Engineering,Central South University,Changsha 410083,China) |
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| Abstract: | Lithium iron orthosilicate cathode materials Li2FeSiO4,Li2FeSiO4/C and Li2Fe0.9Mn0.1SiO4/C were synthesized by solid-state reaction in an argon atmosphere,and the samples were characterized by X-ray diffraction(XRD),scanning electron micrograph(SEM) and electrochemical measurements.The results show that Li2FeSiO4,Li2FeSiO4/C and Li2Fe0.9Mn0.1SiO4/C are of the similar crystal structure.The capacity and cycling performances of 1ithium iron orthosilicate cathodes are improved by manganese doping and carbon coating.The Li2FeSiO4/C has an initial discharge capacity of 112 mA·h/g at C/16 current rate,which is 34.9% higher than that of Li2FeSiO4,and the capacity decays 14% after 30 cycles.However,Li2Fe0.9Mn0.1SiO4/C delivers an initial discharge capacity of 122 mA·h/g and the capacity only decays 9% after 30 cycles. |
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| Keywords: | lithium ion batteries cathode lithium iron orthosilicate carbon coating manganese doping |
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