Nonignorable Influence of Oxygen in Hard Carbon for Sodium Ion Storage,ACS Sustainable Chemistry & Engineering

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Nonignorable Influence of Oxygen in Hard Carbon for Sodium Ion Storage
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-01-16 , DOI: 10.1021/acssuschemeng.9b05948
Chen Chen ₁ , Ying Huang ₁ , Yade Zhu ₁ , Zheng Zhang ₁ , Zhaoxu Guang ₁ , Zhuoyue Meng ₂ , Panbo Liu ₁

Affiliation

As an effective method, heteroatom doping is widely used to improve the electrochemical performance of carbon materials. However, the influence of oxygen-containing functional groups in carbon materials is often neglected. Therefore, we use buckwheat hulls as the precursor to prepare oxygen-doped hard carbon by simple carbonization. The buckwheat hull at a pyrolysis temperature of 1100 °C has the highest reversible capacity of 400 mA h g^–1 at 50 mA g^–1, and the capacity can maintain 96% of the initial capacity after 3000 cycles at 2A g^–1. These results confirm that the natural pore structure and proper interlayer spacing of the BPC-1100 contribute to the transport and insertion of sodium ions. In addition, the first principle proves that the role of oxygen atoms cannot be ignored in the storage of sodium ions. In particular, the improvement of the C═O bond is helpful to improve the adsorption capacity of hard carbon to sodium ions and enhance the reversible capacitance.

中文翻译：

硬碳中氧气对钠离子存储的不可忽视的影响

作为一种有效的方法，杂原子掺杂被广泛用于改善碳材料的电化学性能。然而，经常忽略碳材料中含氧官能团的影响。因此，我们使用荞麦壳作为前驱体，通过简单的碳化来制备氧掺杂的硬碳。热解温度为1100°C的荞麦壳在50 mA g ^–1时具有400 mA hg ^–1的最大可逆容量，在2A g ^{–1的条件下}经过3000次循环后，该容量可以保持初始容量的96％。这些结果证实，BPC-1100的天然孔结构和适当的层间间距有助于钠离子的运输和插入。另外，第一个原理证明了氧原子在钠离子的储存中的作用不容忽视。特别地，C ＝ O键的改善有助于提高硬碳对钠离子的吸附能力并增强可逆电容。

更新日期：2020-01-17

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