[1]石钏,李永亮,任祥忠,等.高性能锂电正极材料LiV3O8-MWCNTs的制备与性能[J].深圳大学学报理工版,2017,34(No.6(551-660)):556-561.
 Shi Chuan,Li Yongliang,Ren Xiangzhong,et al.Preparation and properties of LiV3O8-MWCNTs as high performance cathode materials for lithium-ion battery[J].Journal of Shenzhen University Science and Engineering,2017,34(No.6(551-660)):556-561.
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高性能锂电正极材料LiV3O8-MWCNTs的制备与性能()
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《深圳大学学报理工版》[ISSN:1000-2618/CN:44-1401/N]

卷:
第34卷
期数:
2017年No.6(551-660)
页码:
556-561
栏目:
材料科学
出版日期:
2017-11-30

文章信息/Info

Title:
Preparation and properties of LiV3O8-MWCNTs as high performance cathode materials for lithium-ion battery
作者:
石钏李永亮任祥忠邓立波高原张培新
深圳大学化学与环境工程学院,广东深圳 518060
Author(s):
Shi Chuan Li Yongliang Ren Xiangzhong Deng Libo Gao Yuan and Zhang Peixin
College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, Guangdong Province, P.R.China
关键词:
复合材料锂离子电池低温液相法钒酸锂多壁碳纳米管正极材料电化学性能
Keywords:
coating materials lithium-ion battery low temperature liquid reaction LiV3O8 MWCNTs cathode materials electrochemical performance
文献标志码:
A
摘要:
利用低温液相法合成了钒酸锂-多壁碳纳米管(LiV3O8-(x)MWCNTs)(x=0%、1%、2%、 3%、 4%、 5%)复合正极材料.采用X-射线衍射(X-ray diffraction, XRD)和扫描电镜(scanning electron microscope, SEM)对复合材料的晶型和结构进行了表征. XRD分析结果表明,复合材料仍为单斜晶系;SEM图谱显示,LiV3O8材料附着在MWCNTs的网状结构上,且使颗粒细化;通过恒流充放电测试、循环伏安(cyclic voltammetry, CV)及交流阻抗谱(electrochemical impedance spectroscopy, EIS)技术对材料的电化学性能进行了研究,结果表明,按LiV3O8质量百分比复合3% MWCNTs的LiV3O8-(3%)MWCNTs复合材料具有最佳的电化学性能,在0.1 C充放电倍率条件下,其首次放电比容量为364.5 mAh/g,循环50次后放电比容量仍有292.2 mAh/g,容量保持率为80.2%,而纯LiV3O8材料的首次放电比容量为308.2 mAh/g,循环50次后容量保持率仅为55.4%;采用MWCNTs与LiV3O8复合可使锂离子在材料颗粒间的电荷转移阻抗变小,有利于Li+的嵌入和脱出.
Abstract:
The lithium trivanadate-multiwalled carbon nanotube (LiV3O8-(x)MWCNT) (x=0%, 1%, 2%, 3%, 4%, 5%) composite cathode materials were synthesized by low temperature liquid reaction. The characterizations of the crystal structures and microstructures were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM). XRD analyses show that the LiV3O8-(x)MWCNTs are still monoclinic. The SEM images show that the LiV3O8 is attached to the network structure of MWCNTs, and the LiV3O8 particles have been refined. Charge-discharge cycling performance, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were also used to characterize their electrochemical properties. The tests show that the best proportion of adding MWCNTs was the mass percentage of the composite of 3 wt%, the charge-discharge tests show that LiV3O8-(3%)MWCNTs have the best electrochemical properties, exhibit a high discharge capacity of 364.5 mAh/g and maintain a stable capacity of 292.2 mAh/g within 50 cycles at the charge-discharge rate of 0.1 C, and the capacity retention is 80.2%. But for the pure LiV3O8, the discharge capacity is 308.2 mAh/g, and the capacity retention is only about 55.4% after fifty cycles. The EIS results show that the lithium-ion charge-transfer resistance (Rct) decreases greatly after coating, which is favorable for fast lithium-ion intercalations/deintercalations in materials.

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更新日期/Last Update: 2017-10-10