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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：利用Na2mnpo4f作为Na离子电池的高容量和可逆的阴极材料

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摘要

A Na _(2) MnPO _(4) F/C nanocomposite material is successfully synthesized via spray drying, followed by a high-temperature sintering method. It is shown that the highly phase-pure Na _(2) MnPO _(4) F with symmetry of the P 2 _(1) / n 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 Na _(2) MnPO _(4) F reaches up to 140 and 178 mA h g ~(?1) at 30 °C and 55 °C, respectively. Furthermore, the capacity still maintains 135 mA h g ~(?1) after 20 cycles at 55 °C. The Na ~(+) diffusion coefficient in Na _(2) MnPO _(4) F 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 Na _(2) MnPO _(4) F, which are confirmed by the ex situ XRD measurements during the first cycle and after 30 cycles.
机译：通过喷雾干燥成功合成Na _（2）MNPO _（4）F / C纳米复合材料，然后是高温烧结法合成。结果表明，具有p 2 _（1）/ n个空间组的对称性的高相纯NA _（2）MNPO _（4）F均匀地嵌入在碳网络中，在碳网络中发挥着关键作用高效，电子流通道并升高纳米复合材料的电子电导率。电化学测量结果表明，Na _（2）MNPO _（4）F的初始放电容量分别在30℃和55℃下达到最高140和178mA H G〜（α1）。此外，在55℃下20次循环后，该容量仍然保持135mA H g〜（α1）。通过GITT方法计算Na _（2）MNPO _（4）F中的Na〜（+）扩散系数在约10〜（α17）cm〜（2）s〜（α1）。该材料的令人印象深刻的循环性能归因于Na _（2）MNPO _（4）F的良好结构可逆性和稳定性，其通过在第一个循环期间和30次循环期间通过EX原位XRD测量确认。

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