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Regulating solid electrolyte interphase film on fluorine-doped hard carbon anode for sodium-ion battery
Carbon Energy ( IF 19.5 ) Pub Date : 2024-01-31 , DOI: 10.1002/cey2.503 Cuiyun Yang 1 , Wentao Zhong 1 , Yuqiao Liu 1 , Qiang Deng 1 , Qian Cheng 1 , Xiaozhao Liu 1 , Chenghao Yang 1
Carbon Energy ( IF 19.5 ) Pub Date : 2024-01-31 , DOI: 10.1002/cey2.503 Cuiyun Yang 1 , Wentao Zhong 1 , Yuqiao Liu 1 , Qiang Deng 1 , Qian Cheng 1 , Xiaozhao Liu 1 , Chenghao Yang 1
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For the performance optimization strategies of hard carbon, heteroatom doping is an effective way to enhance the intrinsic transfer properties of sodium ions and electrons for accelerating the reaction kinetics. However, the previous work focuses mainly on the intrinsic physicochemical property changes of the material, but little attention has been paid to the resulting interfacial regulation of the electrode surface, namely the formation of solid electrolyte interphase (SEI) film. In this work, element F, which has the highest electronegativity, was chosen as the doping source to, more effectively, tune the electronic structure of the hard carbon. The effect of F-doping on the physicochemical properties of hard carbon was not only systematically analyzed but also investigated with spectroscopy, optics, and in situ characterization techniques to further verify that appropriate F-doping plays a positive role in constructing a homogenous and inorganic-rich SEI film. The experimentally demonstrated link between the electronic structure of the electrode and the SEI film properties can reframe the doping optimization strategy as well as provide a new idea for the design of electrode materials with low reduction kinetics to the electrolyte. As a result, the optimized sample with the appropriate F-doping content exhibits the best electrochemical performance with high capacity (434.53 mA h g−1 at 20 mA g−1) and excellent rate capability (141 mA h g−1 at 400 mA g−1).
中文翻译：
钠离子电池掺氟硬碳负极上固体电解质界面膜的调控
对于硬碳的性能优化策略，杂原子掺杂是增强钠离子和电子的本征传输特性以加速反应动力学的有效方法。然而，以往的工作主要关注材料固有的物理化学性质的变化，而很少关注由此产生的电极表面的界面调控，即固体电解质间相（SEI）膜的形成。在这项工作中，选择具有最高电负性的元素F作为掺杂源，以更有效地调节硬碳的电子结构。系统分析了F掺杂对硬碳物理化学性质的影响，并利用光谱学、光学和原位表征技术进行了研究，进一步验证了适当的F掺杂对构建均质无机碳材料具有积极的作用。丰富的SEI膜。实验证明电极的电子结构和SEI膜特性之间的联系可以重新制定掺杂优化策略，并为电解质低还原动力学的电极材料的设计提供新的思路。结果，具有适当F掺杂含量的优化样品表现出最佳的电化学性能，具有高容量（20 mA g −1 时为434.53 mAh g −1 ）和优异的倍率性能（ 400 mA g −1 时为 141 mA h g −1 ）。
更新日期：2024-01-31
中文翻译：
钠离子电池掺氟硬碳负极上固体电解质界面膜的调控
对于硬碳的性能优化策略，杂原子掺杂是增强钠离子和电子的本征传输特性以加速反应动力学的有效方法。然而，以往的工作主要关注材料固有的物理化学性质的变化，而很少关注由此产生的电极表面的界面调控，即固体电解质间相（SEI）膜的形成。在这项工作中，选择具有最高电负性的元素F作为掺杂源，以更有效地调节硬碳的电子结构。系统分析了F掺杂对硬碳物理化学性质的影响，并利用光谱学、光学和原位表征技术进行了研究，进一步验证了适当的F掺杂对构建均质无机碳材料具有积极的作用。丰富的SEI膜。实验证明电极的电子结构和SEI膜特性之间的联系可以重新制定掺杂优化策略，并为电解质低还原动力学的电极材料的设计提供新的思路。结果，具有适当F掺杂含量的优化样品表现出最佳的电化学性能，具有高容量（20 mA g −1 时为434.53 mAh g −1 ）和优异的倍率性能（ 400 mA g −1 时为 141 mA h g −1 ）。
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