自支撑多孔碳/硒复合柔性电极的制备及其电化学性能  

Preparation and Electrochemical Performance of Porous Carbon/Selenium Composite Free‑Standing Electrode

作　　者：杨淳 赵欣悦[1] 张灵志[1] YANG Chun;ZHAO Xin‑Yue;ZHANG Ling‑Zhi(CAS Key Laboratory of Renewable Energy,Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development,Guangzhou Institute of Energy Conversion,Chinese Academy of Sciences,Guangzhou 510640,China;Nano Science and Technology Institute,University of Science and Technology of China,Suzhou,Jiangsu 215123,China)

机构地区：[1]中国科学院可再生能源重点实验室,广东省新能源和可再生能源研究开发与应用重点实验室,广州能源研究所,广州510640 [2]中国科学技术大学纳米科学技术学院,苏州215123

出　　处：《无机化学学报》2021年第11期1922-1930,共9页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21573239,51602312);广东省科技项目(No.2015B010135008);王宽诚教育基金会资助。

摘　　要：以二氧化硅(SiO_(2))为模板,结合静电纺丝与溶胶-凝胶法制备了多孔碳纳米纤维膜(PCNFS),再通过熔融扩散法负载硒,制备了一种柔性的碳/硒复合电极(Se@PCNFS)。结合X射线衍射(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)对材料的微观结构和形貌进行表征,结果显示多孔碳纤维直径约300 nm,硒均匀地嵌入碳纤维膜的孔洞中。电化学测试结果表明,1Se@PCNFS电极在锂硒电池中表现出优异的循环性能和倍率性能。在0.5C倍率下,初始放电比容量达到569 mAh·g^(-1),循环500次后比容量为340 mAh·g^(-1);在2C倍率时,比容量为403 mAh·g^(-1)。The porous carbon nanofiber films(PCNFS)were prepared via electrospinning and sol‑gel method using SiO_(2)as template.Then,a flexible carbon/selenium composite electrode(Se@PCNFS)was obtained by melting and diffusion loading of selenium.The microstructure and morphology of the materials were characterized by X‑ray diffraction(XRD),scanning electron microscopy(SEM)and transmission electron microscopy(TEM).The results showed that the porous carbon nanofibers endowed the diameter of about 300 nm and selenium was uniformly dispersed within the fibers.Thus,Se@PCNFS electrode showed outstanding cycling performance and rate performance in lithium‑selenium battery.1Se@PCNFS electrode delivered the initial specific capacity of 569 mAh·g^(-1)and maintained a reversible capacity of 340 mAh·g^(-1)after 500 cycles at 0.5C rate.The reversible capacity was 403 mAh·g^(-1)at 2C rate.

关 键 词：锂硒电池 静电纺丝 碳纳米纤维 柔性电极 

分 类 号：TB332[一般工业技术—材料科学与工程] TM911[电气工程—电力电子与电力传动]