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Preparation and Characterization of Spherical Li3V2 (PO4)3/C Cathode Material for Lithium-ion Batteries

Preparation and Characterization of Spherical Li₃V₂ (PO₄)₃/C Cathode Material for Lithium-ion Batteries

G. Yang^*
| J. R. Ying
| J. Gao
| C. Y. Jiang
| C. R. Wan

Institute of Nuclear and New Energy Technology, Tsinghua University, P.O. Box 1021, Beijing 102201, P. R. China

Institute of Chemical Engineering, Ningbo University of Technology, 89 Cuibai Road, Ningbo 315016, Zhejiang Province, P. R. China

Corresponding Author Email:

yanggai05@mails.tsinghua.edu.cn, yingjr@mail.tsinghua.edu.cn

Received:

November 3, 2008

| |

Accepted:

August 29, 2009

| | Citation

447-article_text-766-1-10-20170802.pdf

OPEN ACCESS

Abstract:

Monoclinic lithium vanadium phosphate Li₃V₂(PO₄)₃ is a very promising polyanion-type cathode material for lithium-ion batteries. In this work, we synthesized spherical Li₃V₂(PO₄)₃ powder via melting V₂O₅ and quenching followed by spray drying and carbothermal reduction processes, using NH₄VO₃, LiOH·H₂O, H₃PO₄ and C₁₂H₂₂O₁₁ as the raw materials. The structure and morphology of the Li₃V₂(PO₄)₃ powders were characterized. The electrochemical property of the spherical Li₃V₂(PO₄)₃ cathode material was characterized by electrochemical measurements. At cut-off voltages of 3.0–4.3 V, 3.0–4.8 V and 1.5–4.8V with current density of 0.2 mA·cm^-2, the cathode material showed initial discharge capacity of 124.7 mAh·g^-1, 157.3 mAh·g^-1, 270.2 mAh·g^-1 and capacity retention of 98.4%, 83.1% and 84.0% after 50 cycles, respectively. The charge-discharge performance tested at different current densities of 0.04 mA·cm^-2, 0.08 mA·cm^-2, 0.2 mA·cm^-2, 0.4 mA·cm^-2, 0.8 mA·cm^-2 and 2 mA·cm^-2 also showed the good rate capability.

Keywords:

Lithium secondary batteries; Li₃V₂(PO₄)₃; Spray-dried; Spherical

1. Introduction

2. Experimiental

3. Results and Discussion

4. Conclusion

5. Acknowledgements

This study is supported by the National Science Foundation of China (Project 50772057), the “973” plan (Project 2007CB209707) and Basic Research Foundation of Tsinghua University (Project JC2007044).

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Preparation and Characterization of Spherical Li3V2 (PO4)3/C Cathode Material for Lithium-ion Batteries