微观结构
离子
钠
材料科学
碳纤维
桥接(联网)
化学工程
锂离子电池的纳米结构
储能
纳米技术
化学
冶金
阳极
复合材料
计算机科学
复合数
有机化学
工程类
物理
热力学
物理化学
电极
计算机网络
功率(物理)
作者
Yuejing Zeng,Jae Young Yang,Huiya Yang,Yang Yang,Jinbao Zhao
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2024-02-26
卷期号:: 1184-1191
标识
DOI:10.1021/acsenergylett.3c02751
摘要
Hard carbon (HC) has emerged as a strong anode candidate for sodium-ion batteries due to its high theoretical capacity and cost-effectiveness. However, its sodium storage mechanism remains contentious, and the influence of the microstructure on sodium storage performance is not yet fully understood. This study successfully correlates structural attributes with electrochemical performance, shedding light on what makes HC effective for sodium-ion storage. It is found that HC featuring larger interlayer spacing and smaller and thinner pseudographite domains is beneficial for facile Na+ intercalation. Conversely, the presence of a long-range ordered graphite structure should be avoided, which may result in the reduction of reversible capacity. Through detailed analysis of three commercial HC products, including in situ X-ray diffraction and Raman measurements, the “adsorption-intercalation-filling” mechanism is validated as a convincing explanation for the varying sodium storage behaviors. Consequently, this work is expected to deepen our understanding of the sodium storage mechanism and provide insightful criteria for the further development of advanced HC materials.
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