摘要
采用溶剂热、熔盐辅助高温处理和甲苯气相沉积相结合的方法在多孔硅颗粒表面构筑二硼化钛(TiB_(2))与碳双组分包覆层,制备了多孔硅@二硼化钛/炭(Si@TiB_(2)/C)复合物,通过X射线衍射仪、X射线光电子能谱仪、扫描电子显微镜和透射电子显微镜等表征手段,对Si@TiB_(2)/C复合物的结构特征进行分析,并研究复合物作为锂离子电池负极材料的电化学性能。结果表明:Si@TiB_(2)/C复合物具有比Si@TiB_(2)和Si@C复合物更优异的电化学性能,在电流密度0.2A/g、0.5A/g、1.0A/g、2.0A/g、3.0A/g、5.0A/g和8.0A/g条件下其可逆比容量分别为1254mAh/g、1052mAh/g、828mAh/g、645mAh/g、577mAh/g、500mAh/g和401mAh/g;在电流密度1.0A/g条件下,循环400次后可逆比容量为627mAh/g,容量保持率为73.0%;良好的倍率和循环性能主要归功于硅颗粒表面复合包覆层中各组分的协同作用。
A porous silicon@titanium diboride/carbon(Si@TiB_(2)/C)composite was synthesized by constructing a dual-component coating layer of TiB_(2) and C on the surface of porous silicon particles using solvothermal,molten salt-assisted high-temperature treatment,and the following toluene vapor deposition.The structure of the as-prepared Si@TiB_(2)/C composite was characterized by X-ray diffraction,X-ray photoelectron spectroscopy,scanning electron microscopy,and transmission electron microscopy,and the electrochemical performance of the Si@TiB_(2)/C composite as anode material for lithium-ion batteries was also investigated.The results showed the Si@TiB_(2)/C composites exhibited better electrochemical performance than Si@TiB_(2) and Si@C composites.Their reversible specific capacities at current densities of 0.2,0.5,1.0,2.0,3.0,5.0,8.0A/g were 1254,1052,828,645,577,500,401 mAh/g,respectively.The specific capacity was 627mAh/g after 400 cycles at 1.0A/g,with a capacity retention rate of 73.0%.The excellent rate capabilities and cycling performance of Si@TiB_(2)/C composites should be attributed to the synergistic effect of the components in the coating layer.
作者
李洲
卿名扬
黎睿
陈凯文
王瑨
赵朔
Li Zhou;Qing Mingyang;Li Rui;Chen Kaiwen;Wang Jin;Zhao Shuo(School of Chemistry and Chemical Engineering,Chongqing University,Chongqing 401331;Sichuan Best Graphite New Energy Co.,Ltd.,Suining 629000)
出处
《化工新型材料》
北大核心
2026年第2期182-187,共6页
New Chemical Materials
基金
国家自然科学基金面上项目(22478042)
重庆市自然科学基金面上项目(cstc2021jcyj-msxmX0777,cstc2020jcyj-msxmX0136)。
