摘要
为解决单一黑磷(BP)负极材料充放电过程中存在的电压滞后较大等问题,采用化学气相沉积法,以红磷为原料,磷碘锡/碳纳米管(Sn_(24)P_(19.3)I_(8)/CNTs)为负载催化剂,通过原位催化制备了黑磷基三元复合材料BP/Sn_(24)P_(19.3)I_(8)/CNTs。采用扫描电子显微镜、透射电子显微镜、X射线衍射仪、拉曼光谱仪、X射线光电子能谱仪对样品的微观形貌、晶格结构、元素组成及其分布情况进行表征,并对BP/Sn_(24)P_(19.3)I_(8)/CNTs复合材料的电化学性能和电压滞后进行了研究。结果表明:BP/Sn_(24)P_(19.3)I_(8)/CNTs复合材料质量较好,元素分布均匀;BP/Sn_(24)P_(19.3)I_(8)/CNTs复合材料之间形成了稳定的P—Sn键和Sn—C键,有助于将黑磷与Sn_(24)P_(19.3)I_(8)/CNTs紧密结合,提高复合材料整体的机械强度和稳定性;在0.1A/g电流密度下,BP/Sn_(24)P_(19.3)I_(8)/CNTs复合材料的首次放电比容量高达1498.88mAh/g,经过100次循环后,容量保持率为75%,库伦效率为98%。这归因于黑磷与碘和锡形成较为稳定的复合结构,有利于增强材料的钠离子嵌入/脱嵌动力学特性,从而提高比容量。此外,BP/Sn_(24)P_(19.3)I_(8)/CNTs复合材料还展现出优异的电子和离子传输性能,以及更为对称的氧化还原路径,这些特性共同作用,使得复合材料电压滞后较小。
To address the issues of significant voltage hysteresis during the charge-discharge process of single black phosphorus anode materials,this study employed the chemical vapor deposition method,using red phosphorus as the raw material and Sn_(24)P_(19.3)I_(8)/CNTs as the loading catalyst,to successfully prepare a black phosphorus-based ternary composite material(BP/Sn_(24)P_(19.3)I_(8)/CNTs)in a single step through in-situ catalysis.The structure and morphology of the samples were characterized using XRD,SEM,and TEM.The electrochemical performance and voltage hysteresis of the BP/Sn_(24)P_(19.3)I_(8)/CNTs composite were investigated.The results indicated that the BP/Sn_(24)P_(19.3)I_(8)/CNTs composite material exhibited high quality with uniform element distribution.Raman and XPS analyses confirmed the formation of stable P-Sn and Sn-C bonds between the BP/Sn_(24)P_(19.3)I_(8)/CNTs composite materials,which helped to closely bind BP with Sn_(24)P_(19.3)I_(8)/CNTs,enhancing the overall mechanical strength and stability of the composite material.Additionally,the electrochemical performance and voltage hysteresis of the BP/Sn_(24)P_(19.3)I_(8)/CNTs composite material were investigated.At a current density of 0.1A/g,the initial discharge specific capacity of the BP/Sn_(24)P_(19.3)I_(8)/CNTs composite material was as high as 1498.88mAh/g,and after 100 cycles,the capacity retention rate was 75%,with a coulombic efficiency of 98%.This was attributed to the formation of a relatively stable composite structure between BP and iodine and tin,which was conducive to enhancing the sodium ion insertion/desorption kinetic properties of the material,thereby improving the specific capacity.Furthermore,the BP/Sn_(24)P_(19.3)I_(8)/CNTs composite material also exhibited excellent electronic and ionic transport performance,as well as more symmetrical redox pathways.These characteristics collectively resulted in a smaller voltage hysteresis for the composite material.
作者
侯梦云
罗桂红
郭忠
马成伟
裴丰
廉培超
Hou Mengyun;Luo Guihong;Guo Zhong;Ma Chengwei;Pei Feng;Lian Peichao(Faculty of Chemical Engineering,Kunming University of Science and Technology,Kunming 650500;Kunming Black Phosphorus Technology Service Co.,Ltd.,Kunming 650500;Hubei Yihua Chemical Technology R&D Co.,Ltd.,Yichang 443311)
出处
《化工新型材料》
北大核心
2026年第2期152-158,共7页
New Chemical Materials
基金
国家自然科学基金(22168021)。
关键词
黑磷基三元复合材料
化学气相沉积法
电压滞后
电化学性能
black phosphorus-based ternary composite materials
chemical vapor deposition method
voltage hysteresis
electrochemical performance
