Uniform and continuous carbon coated sodium vanadium phosphate cathode materials for sodium-ion battery

Uniform and continuous carbon coated sodium vanadium phosphate cathode materials for sodium-ion battery
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钠离子电池用均匀连续碳包覆磷酸钒钠正极材料

DOI:
10.1016/j.jpowsour.2014.09.046
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发表时间:
2014-12
期刊:
J. Power Sources
影响因子:
--
通讯作者:
Yitai Qian
Yitai Qian
中科院分区:
其他
文献类型:
--
作者:
Lulu Si;Zhengqiu Yuan;Lei Hu;Yongchun Zhu;Yitai Qian

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将前驱体在C2H2-热解还原气氛下热处理,合成了包覆均匀连续碳膜的磷酸钒钠Na3V2(PO4)3,其中Na3V2(PO4)3与碳包覆同步形成。作为钠离子电池的正极材料,Na3V2(PO4)3/C 相对于 Na+/Na,在 2.5–4.0 V 电势窗口中显示出约 3.39 V 的平坦充电平台。在1C倍率下循环300次后,充电容量为83.7mAh g−1,放电容量为82.1mAh g−1,库仑效率平均为98%。增强的电化学性能有助于形成均匀连续的碳层,从而大大提高Na3V2(PO4)3的电导率。
Sodium vanadium phosphate Na3V2(PO4)3coated with uniform and continuous carbon film is synthesized by heat treatment of the precursors under C2H2-pyrolysis reducing atmosphere, in which Na3V2(PO4)3is formed synchronously with carbon coating. As a cathode material for Na-ion batteries, Na3V2(PO4)3/C shows a flat charge plateau at about 3.39 V in the potential window of 2.5–4.0 V versus Na+/Na. The charge capacity of 83.7 mAh g−1and discharge capacity of 82.1 mAh g−1can be obtained at a current rate of 1C after 300 cycles and the coulombic efficiency averages 98% throughout. The enhanced electrochemical performance can be contributed to the uniform and continuous carbon layer, which greatly improves the electric conductivity of Na3V2(PO4)3.
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