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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >A new anode material for high performance lithium-ion batteries: V-2(PO4)O/C
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A new anode material for high performance lithium-ion batteries: V-2(PO4)O/C

机译:用于高性能锂离子电池的新型负极材料:V-2(PO4)O / C

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摘要

V-2(PO4)O/C is a promising new anode material for lithium ion batteries with excellent electrochemical properties, synthesized by a facile one pot hydrothermal method, followed by a two-step calcination process. The composite can deliver a reversible capacity of 445 mA h g(-1), 409 mA h g(-1) and 382 mA h g(-1) at 1.0, 1.5 and 2.0 A g(-1). The capacity retentions of V-2(PO4) O/C cycled at 1 and 5 A g(-1) for 200 cycles are 90% and 80%, respectively. The excellent electrochemical properties are mainly attributed to the following three factors: (1) face-sharing [VO6] octahedral arrays endow the crystal with a high intrinsic electronic conductivity; (2) the good lithium ion diffusion coefficient of the material contributes for reducing electrochemical and concentration polarization in the charge-discharge process; and (3) porous microstructure and nanoscale particles not only permit effective contact between the electrolyte and active material, but also provide more space to accommodate volume change during the discharge/charge processes. The results in this study provide convincing evidence that V-2(PO4)O/C has significant research value for future practical applications.
机译:V-2(PO4)O / C是一种有前景的新型锂离子电池负极材料,具有优异的电化学性能,它是通过方便的一锅水热法,随后的两步煅烧工艺合成的。该复合材料在1.0、1.5和2.0 A g(-1)时可提供445 mA h g(-1),409 mA h g(-1)和382 mA h g(-1)的可逆容量。以1和5 A g(-1)循环200次的V-2(PO4)O / C的容量保持率分别为90%和80%。优异的电化学性能主要归因于以下三个因素:(1)面共享[VO6]八面体阵列赋予晶体高的固有电子导电性; (2)良好的锂离子扩散系数有助于降低充放电过程中的电化学极化和浓差极化; (3)多孔的微观结构和纳米级颗粒不仅允许电解质和活性材料之间的有效接触,而且提供了更大的空间来适应放电/充电过程中的体积变化。这项研究的结果提供了令人信服的证据,表明V-2(PO4)O / C对于未来的实际应用具有重要的研究价值。

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