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Facile One-Step Hydrothermal Synthesis of Na3V2(PO4)2F3@C/CNTs Tetragonal Micro-Particles as High Performance Cathode Material for Na-Ion Batteries

机译:Na3V2(PO4)2F3 @ C​​ / CNTs四方微粒作为钠离子电池高性能正极材料的一步一步水热合成

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摘要

In this paper, we report a facile one-step hydrothermal method to synthesize tetragonal Na3V2(PO4)2F3@C particles which are connected by carbon nanotubes (CNTs) networks, using water as hydrothermal solvents. In this strategy, the reduction and crystallization of materials are carried out in the hydrothermal process (180°C, 12 h), no additional heat treatment is required. The well-crystallized Na3V2(PO4)2F3 tetragonal grains (5–10 μm) are coated with amorphous nano-carbon and connected by highly conductive CNTs. The addition of CNTs can not only improve the conductivity of materials but also effectively inhibit the Na3V2(PO4)2F3 grains over growth. The Na3V2(PO4)2F3@C/CNTs composite possesses very flat charge/discharge platforms of 3.6 and 4.1 V. The sample exhibits an initial discharge specific capacity of 120.2 and 74.3 mAh g−1 at 0.1 and 10 C rate, respectively, and shows excellent cyclical stability. The composite owns excellent electrochemical performances owing to the three-dimensional highly conductive network which is co-constructed by the CNTs and nano-carbon coating layer.
机译:在本文中,我们报告了一种简便的一步水热法,以水为水热溶剂,合成了通过碳纳米管(CNTs)网络连接的四方Na3V2(PO4)2F3 @ C​​颗粒。在这种策略下,材料的还原和结晶是在水热处理(180°C,12 h)中进行的,不需要额外的热处理。结晶良好的Na3V2(PO4)2F3四方晶粒(5-10μm)涂有无定形纳米碳,并通过高导电性CNT连接。碳纳米管的添加不仅可以提高材料的电导率,而且可以有效地抑制Na3V2(PO4)2F3晶粒的过度生长。 Na3V 2 (PO 4 2 F 3 @ C / CNTs复合材料具有非常平坦的充电/放电平台分别为3.6和4.1V。样品在0.1和10 C速率下的初始放电比容量分别为120.2和74.3 mAh g -1 ,并且具有出色的循环稳定性。该复合材料由于由CNT和纳米碳涂层共同构成的三维高导电网络而具有出色的电化学性能。

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