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首页> 外文期刊>RSC Advances >Improvement of the Ar/N-2 binary plasma-treated carbon passivation layer deposited on Li4Ti5O12 electrodes for stable high-rate lithium ion batteries
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Improvement of the Ar/N-2 binary plasma-treated carbon passivation layer deposited on Li4Ti5O12 electrodes for stable high-rate lithium ion batteries

机译：用于稳定高倍率锂离子电池的沉积在Li4Ti5O12电极上的Ar / N-2二元等离子体处理的碳钝化层的改进

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摘要

In this study, nanoscale carbon overlayers, with and without nitrogen doping, have been investigated as surface passivation layers to enhance the rate capability and cycling stability of Li4Ti5O12 (LTO). As indicated by optical emission spectroscopy, Raman spectra and high resolution X-ray photoelectron spectroscopy analysis, nitrogen successfully dopes into the carbon overlayer by Ar/N-2 binary plasma irradiation, owing to the interaction between the carbon overlayer and chemically reactive plasma species such as N-2(+) and N. In addition, the results of SEM and XPS depth profiles also prove that the N-doped carbon overlayer can effectively suppress the formation of a resistive solid-electrolyte-interface (SEI) film. The electrochemical test results demonstrate that the LTO coated with N-doped carbon overlayer (NC-overlayer/LTO) exhibits superior capacity (133 mA h g(-1)) and excellent stability with 91% capacity retention over 300 cycles at a high C rate (10C). The excellent electrochemical performance of NC-overlayer/LTO can be attributed to the N-doped carbon passivation layer that effectively facilitates Li+ ion diffusion and reduces internal resistance.
机译：在这项研究中，已经研究了具有和不具有氮掺杂的纳米级碳覆盖层作为表面钝化层，以增强Li4Ti5O12（LTO）的速率能力和循环稳定性。如光发射光谱，拉曼光谱和高分辨率X射线光电子能谱分析所表明的，由于碳覆盖层与化学反应性等离子体物质之间的相互作用，氮气通过Ar / N-2二元等离子体辐射成功地掺杂到碳覆盖层中。此外，SEM和XPS深度分布图的结果还证明，掺杂N的碳覆盖层可以有效抑制电阻性固体电解质界面（SEI）膜的形成。电化学测试结果表明，涂​​有N掺杂碳覆盖层（NC-overlayer / LTO）的LTO表现出优异的容量（133 mA hg（-1））和出色的稳定性，在高C速率下经过300次循环后仍具有91％的容量保持率（10C）。 NC覆盖层/ LTO的出色电化学性能可归因于N掺杂碳钝化层，该碳钝化层可有效促进Li +离子扩散并降低内部电阻。

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