| 复合正极材料LiFePO4/Al/C的制备及性能研究 |
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| 引用本文： | 陈威,彭文杰,王志兴. 复合正极材料LiFePO4/Al/C的制备及性能研究[J]. 无机材料学报, 2012, 0(10): 1130-1134 |
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| 作者姓名： | 陈威 彭文杰 王志兴 |
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| 作者单位： | 中南大学冶金科学与工程学院;湖南杉杉户田新材料有限公司 |
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| 基金项目： | 长沙高新技术开发区项目(K0904114-11)~~ |
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| 摘 要： | 采用二步固相法制备了LiFePO4/Al/C复合正极材料.利用X射线衍射仪、扫描电镜和透射电镜表征样品的晶体结构、形貌、粒径和包覆状态,并研究了铝粉加入量对复合材料电化学性能的影响.结果表明,金属Al与LiFePO4发生了界面反应,生成多种副产物,并在LiFePO4的表面形成钝化膜.在LiFePO4颗粒的表面包覆有不规则形状的金属铝和1～2 nm的碳层.当铝粉加入量为3wt%时,LiFePO4/Al/C复合材料的电化学性能最佳,室温10C倍率下放电克容量为117.8 mAh/g;样品在20℃下,0.1C放电克容量为105.6 mAh/g,相对于常温的放电容量比率为73.8%.
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| 关 键 词： | 磷酸铁锂 复合正极材料 铝 碳包覆 |
Synthesis and Characterization of LiFePO4/Al/C Composite Cathode Material |
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| CHEN Wei,PENG Wen-Jie,WANG Zhi-Xing. Synthesis and Characterization of LiFePO4/Al/C Composite Cathode Material[J]. Journal of Inorganic Materials, 2012, 0(10): 1130-1134 |
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| Authors: | CHEN Wei PENG Wen-Jie WANG Zhi-Xing |
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| Affiliation: | 1(1.School of Metallurgical Science and Engineering,Central South University,Changsha 410083,China;2.Hunan Shanshan Toda Advanced Material Co.Ltd.,Changsha 410205,China) |
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| Abstract: | LiFePO4/Al/C composite cathode materials were synthesized by two-step solid-state method.The crystalline structure,morphology,the particle size and the coated state of the samples were characterized by XRD,SEM and TEM.The effect of the amounts of Al powder on the electrochemical properties of the composite was investigated. The results show that the interface reaction occurs between metal Al and LiFePO4,resulting in the formation of several by-products and the passive film on the surface of LiFePO4.The surface of LiFePO4 particles are coated by the irregularly shaped metal Al and a thin carbon layer of 1.2 nm.The LiFePO4/Al/C containing 3wt% Al shows the best electrochemical performances,with discharge specific capacity of 117.8 mAh/g at 25℃ and 10C rate,and discharge specific capacity of 105.6 mAh/g at.20℃ and 0.1C rate,and discharge capacity of samples at.20℃ is 73.8% of that of samples at 25℃. |
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| Keywords: | lithium iron phosphate composite cathode material aluminium carbon coating |
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