PVA诱导Ti_(3)C_(2)T_(x) MXene交联构筑三维结构电极及其储锂性能研究  

Study on the three-dimensional structure of Ti_(3)C_(2)T_(x) MXene crosslinked electrode induced by PVA and its lithium storage performance

作　　者：刘梅[1] 王雨涵 张泽旭 鲁铭 LIU Mei;WANG Yu-han;ZHANG Ze-xu;LU Ming(College of Physics,Jilin Normal University,Siping 136000,China)

机构地区：[1]吉林师范大学物理学院,吉林四平136000

出　　处：《吉林师范大学学报（自然科学版）》2022年第1期11-17,共7页Journal of Jilin Normal University:Natural Science Edition

基　　金：国家自然科学基金项目(21978110);吉林省科技发展计划项目(20200201279JC)。

摘　　要：MXene因其二维层状结构在锂离子电池负极材料研究领域展现出独特的优势,然而MXene片层间有很强的范德瓦尔斯力,导致了其发生堆叠,制约了其储锂性能表现.基于冷冻干燥技术制备了不同PVA含量的Ti_(3)C_(2)T_(x) MXene气凝胶,构筑了具有三维结构的电解液输运通道.借助X射线衍射仪(XRD)、扫描电子显微镜(SEM)、傅里叶变换红外光谱仪(FTIR)和共聚焦显微拉曼光谱仪(Raman)对气凝胶的微观结构与形貌进行了表征.储锂性能评估表明P400样品具有最高的比容量,其值为252.702 mA·h/g,在200圈充放电循环后,比容量依然能够保持在154.410 mA·h/g.发现随着PVA引入量增加使MXene交联行为增强,Ti_(3)C_(2)T_(x) MXene气凝胶空隙增大,有序度提高,进而优化了离子输运行为,提高了其储锂性能.该工作为基于二维MXene纳米片构筑三维结构电极提供了基础设计指导,为开发多孔结构电极提供了设计思路.MXene has an unique advantage in the research field of lithium ion battery anode materials due to its two-dimensional layered structure.However,MXene has a strong Van der Waals force between the adjacent layers,which leads to its stacking and restricts its lithium storage performance.Ti_(3)C_(2)T_(x) MXene aerogels with different PVA contents were prepared by freeze-drying technology.Electrolyte transport channels with three-dimensional structure were constructed.The microstructure and morphology of the aerogels were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FTIR)and confocal Raman microscopy(Raman).The evaluation of lithium storage performance shows that P400 sample achieves the highest specific capacity of 252.702 mA·h/g,and the specific capacity can still maintain at 154.410 mA·h/g after 200 cycles.The enhanced cross-linking behavior of MXene induced a larger internal space upon the increased PVA content,which optimizes the ion transport operation and improves the lithium storage performance of MXene.This work provides a basic design guidance for constructing three-dimensional structure electrode based on two-dimensional MXene nanosheets,and provides a design approach for developing porous structure electrode.

关 键 词：Ti_(3)C_(2)T_(x)MXene气凝胶 聚乙烯醇 负极材料 

分 类 号：TB302[一般工业技术—材料科学与工程]