Citation: YUAN Zhi-Hong, MA Jun, CHEN Xing, LIU Kai-Yu. P123-Assisted Rheological Phase Reaction Synthesis and Electrochemical Performance of Li₃V₂(PO₄)₃/C Cathode[J]. Acta Physico-Chimica Sinica doi: 10.3866/PKU.WHXB201209253 shu

P123-Assisted Rheological Phase Reaction Synthesis and Electrochemical Performance of Li₃V₂(PO₄)₃/C Cathode

1.
College of Chemistry & Chemical Engineering, Central South University, Changsha 410083, P. R. China

Received Date: 29 July 2012
Available Online: 25 September 2012
Fund Project: 国家自然科学基金(21071153, 20976198)资助项目 (21071153, 20976198)

A monoclinic Li₃V₂(PO₄)₃/C cathode has been synthesized for use in lithium ion battery applications via a P123-assisted rheological phase reaction (RPR) method. Li₃V₂(PO₄)₃/C composite materials were prepared from a mixture of V₂O₅, LiH₂PO₄, LiOH, citric acid, and triblock copolymer surfactant P123. The composite material was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The electrochemical performance was tested by Galvanostatic charge-discharge tests, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The P123-assisted Li3V2(PO4)3/C assumes a pure monoclinic crystal structure and exhibits a high initial discharge capacity of 128.9 mAh·g^-1, which only decreases by 0.9% of its initial value after 50 cycles at 0.1C between 3.0 and 4.3 V. Moreover, the cathode displays od fast rate performance, displaying discharge capacities of 128.2, 121.3, and 109.1 mAh·g^-1 and capacity retentions after 50 charge-discharge cycles of 99.1%, 96.9%, and 90.7% at rates of 1C, 10C, and 25C, respectively. The introduction of the triblock copolymer surfactant P123 to the RPR system is attributed to the excellent electrochemical performance. It acts as a surfactant as well as an organic carbon source, and forms a carbon network in the particle surface, which helps improve the material conductivity rate, and reduce the charge transfer resistance and electrode polarity effects during the charge-discharge process.
- Lithium ion battery,
- Cathode material,
- Li₃V₂(PO₄)₃,
- Rheological phase reaction,
- Triblock copolymer surfactant P123
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

P123-Assisted Rheological Phase Reaction Synthesis and Electrochemical Performance of Li3V2(PO4)3/C Cathode

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通讯作者: 陈斌, bchen63@163.com

P123-Assisted Rheological Phase Reaction Synthesis and Electrochemical Performance of Li₃V₂(PO₄)₃/C Cathode