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首页> 外文期刊>RSC Advances >Exploiting Na2MnPO4F as a high-capacity and well-reversible cathode material for Na-ion batteries
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Exploiting Na2MnPO4F as a high-capacity and well-reversible cathode material for Na-ion batteries

机译：开发Na2MnPO4F作为Na离子电池的高容量和可逆性正极材料

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A Na2MnPO4F/C nanocomposite material is successfully synthesized via spray drying, followed by a high-temperature sintering method. It is shown that the highly phase-pure Na2MnPO4F with symmetry of the P2(1) space group is uniformly embedded in the carbon networks, which play a key role in building up a highly efficient, electron-flow channel and elevating the electronic conductivity of the nanocomposites. The electrochemical measurements show that the initial discharge capacity of Na2MnPO4F reaches up to 140 and 178 mA h g(-1) at 30 degrees C and 55 degrees C, respectively. Furthermore, the capacity still maintains 135 mA h g(-1) after 20 cycles at 55 degrees C. The Na+ diffusion coefficient in Na2MnPO4F is calculated at about 10(-17) cm(2) s(-1) by the GITT method. The impressive cycling performance of the material is ascribed to the good structural reversibility and stability of Na2MnPO4F, which are confirmed by the ex situ XRD measurements during the first cycle and after 30 cycles.
机译：通过喷雾干燥成功地合成了Na2MnPO4F / C纳米复合材料，然后进行了高温烧结。结果表明，具有对称性的P2（1）/ n空间基团的高纯Na2MnPO4F被均匀地嵌入碳网络中，这在建立高效的电子流通道和提升电子流方面起着关键作用。纳米复合材料的电导率。电化学测量表明，Na2MnPO4F的初始放电容量分别在30摄氏度和55摄氏度时分别达到140和178 mA h g（-1）。此外，在55摄氏度下20个循环后，容量仍保持135 mA h g（-1）。Na2MnPO4F中的Na +扩散系数通过GITT方法计算为约10（-17）cm（2）s（-1）。该材料令人印象深刻的循环性能归因于Na2MnPO4F的良好结构可逆性和稳定性，这在第一个循环中和30个循环后的异位XRD测量得到了证实。

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