γ射线辐照硬碳结构演化及其储钠性能  

Structural evolution and sodium storage properties of γ-ray irradiated hard carbon

作　　者：宋晓辉 石海婷 王硕[1] 高攀[1] 徐志伟[1] SONG Xiaohui;SHI Haiting;WANG Shuo;GAO Pan;XU Zhiwei(School of Textile Science and Engineering,Tiangong University,Tianjin 300387,China;Tianjin Kinfa Advanced Materials Co.,Ltd.,Tianjin 300000,China)

机构地区：[1]天津工业大学纺织科学与工程学院,天津300387 [2]天津金发新材料有限公司,天津300000

出　　处：《辐射研究与辐射工艺学报》2024年第1期10-17,共8页Journal of Radiation Research and Radiation Processing

基　　金：国家自然科学基金项目(12105202)资助。

摘　　要：通过γ射线辐照技术引入“自掺杂”缺陷,优化硬碳层间尺寸和孔结构。通过扫描电镜、X射线衍射、拉曼光谱、等温氮气吸脱附等方法探究了吸收剂量对硬碳层间距与内部缺陷、无序结构的影响;通过恒电流充/放电研究了材料的电化学性能。结果表明:较低剂量辐照会提升硬碳表面结晶度,而随着吸收剂量的增加,硬碳无序结构增多,辐照后硬碳电化学性能得到明显改善。在140 kGy剂量辐照下,硬碳呈现出425.343 m^(2)/g的高比表面积,硬碳在30 mA/g能够提供300 mAh/g的储钠容量,在1 A/g大电流密度容量仍然保持在195 mAh/g,对比未辐照处理的硬碳,电极容量提高了3倍,并且在大倍率充/放电过程中保持优良的稳定性能。这项工作为设计先进的纳米材料及缺陷工程在储能领域的应用提供了新的途径和思路。In this study,self-doping defects were introduced to optimize the interlayer spacing and pore structure of hard carbon byγ-ray irradiation.The effects of the absorbed dose on the interlayer spacing,internal defects,and disordered structure of hard carbon were investigated through scanning electron microscopy(SEM),Xray diffraction(XRD),Raman spectroscopy,and isothermal nitrogen adsorption/desorption.The electrochemical properties were investigated using the constant current charge-discharge.The results showed that the surface crystallinity and disordered structure of hard carbon increased with the absorbed dose.Moreover,the electrochemical properties of hard carbon were clearly improved.At a dose of 140 kGy,hard carbon presented a high specific surface area of 425.343 m^(2)/g and provided a sodium storage capacity of 300 mAh/g at 30 mA/g;the high current density capacity remained at 195 mAh/g at 1 A/g,suggesting that the electrode capacity increased three-fold.Excellent stability was also maintained during high-rate charge-discharge.This work provides new approaches and ideas for the design of advanced nanomaterials and defect engineering applications in the field of energy storage.

关 键 词：Γ射线 辐照 硬碳 缺陷 层间尺寸 储钠性能 

分 类 号：TL13[核科学技术—核能科学]