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| 以溶液法制备的钠掺杂锂离子电池正极材料Li3-xNaxV2(PO4)3/C | |
| 引用本文： | 李玲芳,韩绍昌,范长岭,王菲菲.以溶液法制备的钠掺杂锂离子电池正极材料Li3-xNaxV2(PO4)3/C[J].化工进展,2018,37(1):201-205. |
| 作者姓名： | 李玲芳 韩绍昌 范长岭 王菲菲 |
| 作者单位： | 1.湖南大学材料科学与工程学院, 湖南 长沙 410082;2.湖南文理学院机械工程学院, 湖南 常德 415000;3.湖南文理学院化学与材料工程学院, 湖南 常德 415000 |
| 基金项目： | 国家自然科学基金面上项目（51172068）及湖南文理学院“洞庭湖生态经济区建设与发展”湖南省协同创新中心项目（湘教通[2015]351号）。 |
| 摘 要： | 以溶液法为制备方法、以葡萄糖为碳源合成了一种钠离子掺杂的锂离子电池正极材料Li3-xNaxV2（PO4）3/C（x=0、0.01、0.03、0.05、0.07）。XRD结果显示组成相为单斜晶型，与标准Li3V2（PO4）3衍射峰完全一致。微量钠掺杂并未改变产物的相组成与晶体结构，但使得晶胞参数有所变化，这种变化有利于提高锂离子的扩散系数。SEM与TEM谱图显示材料颗粒基本为近似椭圆形，粒径分布均匀，碳包覆层完整。充放电测试显示Li2.97Na0.03V2（PO4）3/C试样的倍率性能最好，在12C倍率下放电比容量约为100mAh/g，循环伏安测试也证明该试样的锂离子扩散系数较高，比纯相Li3V2（PO4）3提高了约2个数量级。 |
| 关 键 词： | 电化学 制备 复合材料 溶液法 Li3V2(PO4)3/C |
| 收稿时间： | 2017-04-25 |
Sodium doped cathode material of lithium ion batteries Li3-xNaxV2(PO4)3/C synthesized by solution method |
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| LI Lingfang,HAN Shaochang,FAN Changling,WANG Feifei.Sodium doped cathode material of lithium ion batteries Li3-xNaxV2(PO4)3/C synthesized by solution method[J].Chemical Industry and Engineering Progress,2018,37(1):201-205. | |
| Authors: | LI Lingfang HAN Shaochang FAN Changling WANG Feifei |
| Affiliation: | 1 College of Materials Science and Engineering, Hunan University, Changsha 410082, Hunan, China; 2 College of Mechanical Engineering, Hunan University of Arts and Science, Changde 415000, Hunan, China; 3 College of Chemistry and Materials Engineering, Hunan University of Arts and Science, Changde 415000, Hunan, China |
| Abstract: | A cathode material of lithium ion batteries Li3-xNaxV2 (PO4)3/C (x=0, 0.01, 0.03, 0.05, 0.07)was synthesized by solution method with glucose as the carbon source. XRD patterns illustrate that the constituent is of typical monoclinic crystal and coincide exactly with diffraction peaks of Li3V2 (PO4)3. Sodium ion doesn't change the ingredient and crystal structure of product but change the lattice parameters. This tiny change of lattice parameters is conductive to the lithium ion diffusion. The cathode material particles are nearly elliptic in the SEM and TEM images. Particles are in even size distribution and have integrated carbon coating. The results of the charge-discharge tests proved that Li2.97Na0.03V2 (PO4)3/C has the best rate performance with a discharge capacity of 100mAh/g at 12C rate. CV test demonstrates the diffusion coefficient of this sample is about two orders of magnitude higher than that of pure Li3V2 (PO4)3. |
| Keywords: | electrochemistry preparation composites solution method Li3V2(PO4)3/C |
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