Qin ZHONG , Ying MO , Wang ZHOU , Biao ZHENG , Jian-fang WU , Guo-ku LIU , Zieauddin Kufian Mohd , Osman Zurina , Xiong-wen XU , Peng GAO , Le-zhi YANG , Ji-lei LIU
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引用次数: 0
Abstract
Changes to the microstructure of a hard carbon (HC) and its solid electrolyte interface (SEI) can be effective in improving the electrode kinetics. However, achieving fast charging using a simple and inexpensive strategy without sacrificing its initial Coulombic efficiency remains a challenge in sodium ion batteries. A simple liquid-phase coating approach has been used to generate a pitch-derived soft carbon layer on the HC surface, and its effect on the porosity of HC and SEI chemistry has been studied. A variety of structural characterizations show a soft carbon coating can increase the defect and ultra-micropore contents. The increase in ultra-micropore comes from both the soft carbon coatings and the larger pores within the HC that are partially filled by pitch, which provides more Na+ storage sites. In-situ FTIR/EIS and ex-situ XPS showed that the soft carbon coating induced the formation of thinner SEI that is richer in NaF from the electrolyte, which stabilized the interface and promoted the charge transfer process. As a result, the anode produced fastcharging (329.8 mAh g–1 at 30 mA g–1 and 198.6 mAh g–1 at 300 mA g–1) and had a better cycling performance (a high capacity retention of 81.4% after 100 cycles at 150 mA g–1). This work reveals the critical role of coating layer in changing the pore structure, SEI chemistry and diffusion kinetics of hard carbon, which enables rational design of sodium-ion battery anode with enhanced fast charging capability.
改变硬碳（HC）及其固体电解质界面（SEI）的微观结构可以有效地改善电极动力学。然而，在不牺牲初始库仑效率的情况下，用一种简单而廉价的策略实现快速充电，仍然是钠离子电池面临的挑战。采用简单的液相镀膜方法在HC表面制备了沥青衍生的软碳层，并研究了其对HC和SEI化学孔隙率的影响。多种结构表征表明，软碳涂层可以增加缺陷和超微孔的含量。超微孔的增加来自于软碳涂层和HC内部较大的孔，这些孔部分被沥青填充，从而提供了更多的Na+存储位点。原位FTIR/EIS和非原位XPS表明，软碳涂层诱导电解质形成了更薄、更富NaF的SEI，稳定了界面，促进了电荷转移过程。结果，阳极产生了快速充电（30ma g-1时329.8 mAh g-1, 300ma g-1时198.6 mAh g-1），并且具有更好的循环性能（150 mA g-1下100次循环后的高容量保持率为81.4%）。本研究揭示了涂层在改变硬碳的孔隙结构、SEI化学和扩散动力学方面的关键作用，为合理设计具有增强快速充电能力的钠离子电池阳极提供了可能。下载：下载高分辨率图片（121KB）下载：下载全尺寸图片
期刊介绍：
New Carbon Materials is a scholarly journal that publishes original research papers focusing on the physics, chemistry, and technology of organic substances that serve as precursors for creating carbonaceous solids with aromatic or tetrahedral bonding. The scope of materials covered by the journal extends from diamond and graphite to a variety of forms including chars, semicokes, mesophase substances, carbons, carbon fibers, carbynes, fullerenes, and carbon nanotubes. The journal's objective is to showcase the latest research findings and advancements in the areas of formation, structure, properties, behaviors, and technological applications of carbon materials. Additionally, the journal includes papers on the secondary production of new carbon and composite materials, such as carbon-carbon composites, derived from the aforementioned carbons. Research papers on organic substances will be considered for publication only if they have a direct relevance to the resulting carbon materials.
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