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Issue 29, 2015
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Improved electrochemical performance of the Na3V2(PO4)3 cathode by B-doping of the carbon coating layer for sodium-ion batteries

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Abstract

Boron-doped carbon coating is initially used to improve the electrochemical performance of Na3V2(PO4)3 cathode materials of sodium-ion batteries. Based on the precise analysis of Raman spectroscopy, electrochemical impedance spectroscopy and X-ray photoemission spectroscopy, it is found that there are four different B-doping species (B4C, BC3, BC2O and BCO2) in various boron-doped carbon coated Na3V2(PO4)3 samples; moreover, different B-doping species in the carbon coated layer have different impacts on the improvement of the electrochemical performance of Na3V2(PO4)3. Compared to lithium-ion batteries, the mechanism of B-doped carbon coating for the improvement of the electrochemical performance in sodium-ion batteries is different. Due to the introduction of the O atom in the carbon coated layer, BC2O and BCO2 significantly increase numerous extrinsic defects and active sites, which could significantly accelerate Na+ transport in the carbon layer. Therefore, it is unexpectedly demonstrated that Na3V2(PO4)3/C + B, which consists of the largest total amount of BC2O + BCO2, exhibits the best electrochemical performance, particularly high-rate performance and cycling stability. As an example, when the discharging rate increases from 0.2 C to 5 C, it delivers 95.8 mA h g−1 to 90.3 mA h g−1 and an amazing capacity retention of 94% is achieved.

Graphical abstract: Improved electrochemical performance of the Na3V2(PO4)3 cathode by B-doping of the carbon coating layer for sodium-ion batteries

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Publication details

The article was received on 13 May 2015, accepted on 16 Jun 2015 and first published on 16 Jun 2015


Article type: Paper
DOI: 10.1039/C5TA03519H
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Citation: J. Mater. Chem. A, 2015,3, 15190-15201
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    Improved electrochemical performance of the Na3V2(PO4)3 cathode by B-doping of the carbon coating layer for sodium-ion batteries

    W. Shen, H. Li, C. Wang, Z. Li, Q. Xu, H. Liu and Y. Wang, J. Mater. Chem. A, 2015, 3, 15190
    DOI: 10.1039/C5TA03519H

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