Mo-doped Na₃V₂(PO₄)₃@C composites for high stable sodium ion battery cathode

Abstract

NASICON-type Na₃V₂(PO₄)₃ (NVP) with superior electrochemical performance has attracted enormous attention with the development of sodium ion batteries. The structural aggregation as well as poor conductivity of NVP hinder its application in high rate perforamance cathode with long stablity. In this paper, Na₃V_2−xMo_x(PO₄)₃@C was successfully prepared through two steps method, including sol–gel and solid state thermal reduction. The optimal doping amount of Mo was defined by experiment. When x was 0.15, the Na₃V_1.85Mo_0.15(PO₄)₃@C sample has the best cycle performance and rate performance. The discharge capacity of Na₃V_1.85Mo_0.15(PO₄)₃@C could reach 117.26 mA·h·g⁻¹ at 0.1 C. The discharge capacity retention was found to be 94.5% after 600 cycles at 5 C.

Keywords

energy storage materials / doping / electrochemical reactions / Na ion battery

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