喷雾干燥法制备球形Li3V2(PO4)3/C正极材料及其电化学性能

doi:10.16085/j.issn.1000-6613.2018-0609

化工进展 ›› 2019, Vol. 38 ›› Issue (03): 1482-1486.DOI: 10.16085/j.issn.1000-6613.2018-0609

喷雾干燥法制备球形Li₃V₂(PO₄)₃/C正极材料及其电化学性能

李玲芳¹(),范长岭²(),文政²,曾斌¹

1. 湖南文理学院机械工程学院，湖南常德 415000
2. 湖南大学材料科学与工程学院，湖南长沙 410082

收稿日期:2018-03-26 修回日期:2018-11-23 出版日期:2019-03-05 发布日期:2019-03-05
通讯作者: 范长岭
作者简介:李玲芳(1981—)，女，博士，副教授，研究方向为锂离子电池。E-mail:yourvicky@126.com。|范长岭，高级实验师，博士，研究方向为锂离子电池。E-mail:fancl@hnu.edu.cn。
基金资助:
国家自然科学基金(51802096，51472082，51672079);湖南文理学院洞庭湖生态经济区建设与发展省级协同创新中心(湘教通[2015]351号);湖南文理学院博士启动项目(17BSQD09)

Synthesis of spherical Li₃V₂(PO₄)/C by spray drying and its electrochemical performance as cathode material

Lingfang LI¹(),Changling FAN²(),Zheng WEN²,Bin ZENG¹

1. College of Mechanical Engineering, Hunan University of Arts and Science, Changde 415000, Hunan, China
2. College of Materials Science and Engineering, Hunan University, Changsha 410082, Hunan, China

Received:2018-03-26 Revised:2018-11-23 Online:2019-03-05 Published:2019-03-05
Contact: Changling FAN

摘要/Abstract

摘要：

从控制Li₃V₂(PO₄)/C的形貌入手，旨在提高其作为锂离子电池正极材料的电化学性能。以葡萄糖为碳源，CTAB为表面活性剂，利用喷雾干燥法制备了粒径约为1μm的正球形Li₃V₂(PO₄)/C活性材料，颗粒尺寸均匀，振实密度较高。葡萄糖热解碳所形成的包覆层有效提高了材料的导电性，对材料的形貌控制则改善了锂离子扩散能力，因此本文所合成的Li₃V₂(PO₄)/C具良好的电化学性能，材料的锂离子扩散系数相对纯相提升约2个数量级，低于1C倍率下放电比容量均大于115mA?h/g，10C和15C大倍率下放电比容量为85mA?h/g和75mA?h/g左右，5C下循环50次，其库仑效率为96.2%。充放电平台的电位平稳，电位差较小，电化学反应阻抗值小，说明极化现象得到了有效控制。

关键词: 电化学, 表面活性剂, 纳米材料, 喷雾干燥法, 形貌控制

Abstract:

To enhance the electrochemical performance of Li₃V₂(PO₄)/C as the cathode material of Li-ion batteries, we studied its morphology control. By using the spray drying process, we synthesized a kind of spherical Li₃V₂(PO₄)/C particles with uniform diameter about 1μm and high tap density. Glucose was chosen as the carbon source and CTAB as the surfactant. This spherical Li₃V₂(PO₄)/C has outstanding electrochemical performance which is due to two the main reasons. First, the pyrolytic carbon of glucose coating on the surface of the cathode particle enhanced its conductivity efficiently. Second, the morphological control improved the diffusion of Li⁺ . It had a capacity of more than 115mA?h/g when discharge rate was less than 1C. At rate of 10C and 15C, the discharge capacities were 85mA?h/g and 75mA?h/g, respectively. Furthermore, the columbic efficiency is 96.2% after cycle 50 times at 5C. It exhibited flat and steady platforms on the charge/discharge curve and small electrochemical resistance, which means that polarization phenomenon was effectively controlled.

Key words: electrochemistry, surfactants, nanomaterials, spray drying process, morphological control

中图分类号:

TQ15

李玲芳,范长岭,文政,曾斌. 喷雾干燥法制备球形Li₃V₂(PO₄)₃/C正极材料及其电化学性能[J]. 化工进展, 2019, 38(03): 1482-1486.

Lingfang LI,Changling FAN,Zheng WEN,Bin ZENG. Synthesis of spherical Li₃V₂(PO₄)/C by spray drying and its electrochemical performance as cathode material[J]. Chemical Industry and Engineering Progress, 2019, 38(03): 1482-1486.

图/表 4

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喷雾干燥法制备球形Li₃V₂(PO₄)₃/C正极材料及其电化学性能

Synthesis of spherical Li₃V₂(PO₄)/C by spray drying and its electrochemical performance as cathode material

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