Citation: LI Wan-Long, LI Yue-Jiao, CAO Mei-Ling, QU Wei, QU Wen-Jie, CHEN Shi, CHEN Ren-Jie, WU Feng. Synthesis and Electrochemical Performance of Alginic Acid-Based Carbon-Coated Li₃V₂(PO₄)₃ Composite by Rheological Phase Method[J]. Acta Physico-Chimica Sinica, ;2017, 33(11): 2261-2267. doi: 10.3866/PKU.WHXB201705293 shu

Synthesis and Electrochemical Performance of Alginic Acid-Based Carbon-Coated Li₃V₂(PO₄)₃ Composite by Rheological Phase Method

LI Wan-Long ^1, ,
LI Yue-Jiao ¹ ,
CAO Mei-Ling ¹ ,
QU Wei ¹ ,
QU Wen-Jie ¹ ,
CHEN Shi ^1,2 ,
CHEN Ren-Jie ^1,2 ,
WU Feng ^1,2

1.
Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, P. R. China;
2.
Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing 100081, P. R. China

Received Date: 27 March 2017
Revised Date: 23 May 2017

Fund Project: The project was supported by the National Key Research and Development Program of China (2016YFB0100204), National Natural Science Foundation of China (21373028), Joint Funds of the National Natural Science Foundation of China (U1564206), and Major achievements Transformation Project for Central University in Beijing, Beijing Science and Technology Project (D151100003015001).

Li₃V₂(PO₄)₃/C (LVP/C) cathode materials were successfully prepared by a rheological phase method using alginic acid as the carbon source. The X-ray diffraction (XRD) patterns demonstrate that all the samples contain pure LVP with the same monoclinic structure. The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images show that LVP/C materials have a uniform particle size. The LVP/C sample with 10% (w) alginic acid shows the best cycling stability. It delivers a discharge capacity of 117.5 mAh·g^-1 (3.0-4.3 V), which can be maintained at 116.5 mAh·g^-1 after 50 cycles at a rate of 0.1C. Its capacity retentions of 99.1% (3.0-4.3 V) and 76.8% (3.0-4.8 V) after 50 cycles are prominently higher than those of pristine Li₃V₂(PO₄)₃, which are 89.7% (3.0-4.3 V) and 62.39% (3.0-4.8 V). These outstanding electrochemical performances are mainly attributed to the alginic acid-based carbon coating, which can increase the electronic conductivity of materials and buffer the mechanical damage of the active materials during the Li ion insertion/extraction process, thus improving the electrochemical performance of the LVP/C samples.
- Lithium ion battery,
- Rheological phase method,
- Alginic acid,
- Li₃V₂(PO₄)₃/C composite
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Synthesis and Electrochemical Performance of Alginic Acid-Based Carbon-Coated Li₃V₂(PO₄)₃ Composite by Rheological Phase Method