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Nanomaterials 2017, 7(3), 52; doi:10.3390/nano7030052

Preparation and Electrochemical Properties of Li3V2(PO4)3−xBrx/Carbon Composites as Cathode Materials for Lithium-Ion Batteries

1,2,* , 1,2
,
1,2,* and 1,2
1
School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou 450001, China
2
Key Laboratory of High Specific Energy Materials for Electrochemical Power Sources of Zhengzhou City, Henan University of Technology, Zhengzhou 450001, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Yuan Chen
Received: 25 January 2017 / Revised: 16 February 2017 / Accepted: 21 February 2017 / Published: 24 February 2017
View Full-Text   |   Download PDF [4063 KB, uploaded 24 February 2017]   |  

Abstract

Li3V2(PO4)3−xBrx/carbon (x = 0.08, 0.14, 0.20, and 0.26) composites as cathode materials for lithium-ion batteries were prepared through partially substituting PO43− with Br, via a rheological phase reaction method. The crystal structure and morphology of the as-prepared composites were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), and electrochemical properties were evaluated by charge/discharge cycling and electrochemical impedance spectroscopy (EIS). XRD results reveal that the Li3V2(PO4)3−xBrx/carbon composites with solid solution phase are well crystallized and have the same monoclinic structure as the pristine Li3V2(PO4)3/carbon composite. It is indicated by SEM images that the Li3V2(PO4)3−xBrx/carbon composites possess large and irregular particles, with an increasing Br content. Among the Li3V2(PO4)3−xBrx/carbon composites, the Li3V2(PO4)2.86Br0.14/carbon composite shows the highest initial discharge capacity of 178.33 mAh·g−1 at the current rate of 30 mA·g−1 in the voltage range of 4.8–3.0 V, and the discharge capacity of 139.66 mAh·g−1 remains after 100 charge/discharge cycles. Even if operated at the current rate of 90 mA·g−1, Li3V2(PO4)2.86Br0.14/carbon composite still releases the initial discharge capacity of 156.57 mAh·g−1, and the discharge capacity of 123.3 mAh·g−1 can be maintained after the same number of cycles, which is beyond the discharge capacity and cycleability of the pristine Li3V2(PO4)3/carbon composite. EIS results imply that the Li3V2(PO4)2.86Br0.14/carbon composite demonstrates a decreased charge transfer resistance and preserves a good interfacial compatibility between solid electrode and electrolyte solution, compared with the pristine Li3V2(PO4)3/carbon composite upon cycling. View Full-Text
Keywords: lithium-ion batteries; Li3V2(PO4)3/carbon composites; cathode materials; bromine ion doping; enhanced electrochemical performances lithium-ion batteries; Li3V2(PO4)3/carbon composites; cathode materials; bromine ion doping; enhanced electrochemical performances
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MDPI and ACS Style

Cao, X.; Mo, L.; Zhu, L.; Xie, L. Preparation and Electrochemical Properties of Li3V2(PO4)3−xBrx/Carbon Composites as Cathode Materials for Lithium-Ion Batteries. Nanomaterials 2017, 7, 52.

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