期刊文献+

超临界CO_(2)流体辅助合成Si-Fe-Fe_(3)O_(4)-C复合材料及储锂性能

Supercritical CO_(2)fluid assisted synthesis of Si-Fe-Fe_(3)O_(4)-C composites and lithium storage performance
原文传递
导出
摘要 硅碳负极是未来锂离子电池材料发展的重点方向之一,本文针对传统球磨法制备硅碳负极复合不均匀、界面融合差等问题,提出了一种超临界二氧化碳(scCO_(2))流体介质球磨合成Si-Fe-Fe_(3)O_(4)-C复合材料的新方法。研究发现,纳米硅和中间相碳微球(MCMB)在scCO_(2)介质球磨混合过程中,CO_(2)和Fe反应先得到均匀分散的Si-FeCO_(3)-C前驱体,然后FeCO_(3)原位高温固相分解得到Si-Fe-Fe_(3)O_(4)-C复合材料。同时,在scCO_(2)流体渗透下,MCMB剥离成石墨片,并与纳米硅和Fe-Fe_(3)O_(4)实现较好的界面融合,Fe-Fe_(3)O_(4)的引入显著提升了硅碳负极的储锂容量、循环稳定性和倍率性能,Si-Fe-Fe_(3)O_(4)-C复合材料在0.2 A·g^(-1)下100次循环后可逆容量保持在1065 mA·h·g^(-1)。本方法利用超临界流体渗透性好、扩散能力强等特点,合成工艺简便,容易工业化实施,具有商业化开发潜力。 Silicon-carbon anode is an important issue for the development of lithium-ion battery materials.Aiming at the problems of uneven combination and poor interfacial contact of silicon-carbon anode prepared by traditional ball milling,this paper proposes a new strategy to synthesize Si-Fe-Fe_(3)O_(4)-C composite by ball milling in supercritical carbon dioxide(scCO_(2))fluid medium.It is found that during the process of ball milling mixture of nano-silicon and mesophase carbon microspheres(MCMB)in the scCO_(2)medium,CO_(2)and Fe reacts firstly to form a uniformly dispersed Si-FeCO_(3)-C precursor,and then in situ high temperature decomposition of FeCO_(3) solid phase results in final Si-Fe-Fe_(3)O_(4)-C product.Under the infiltration of scCO_(2)fluid,MCMB microspheres exfoliate into graphite flakes,and achieve ideal combination with nano-silicon and Fe-Fe_(3)O_(4).The introduction of Fe-Fe_(3)O_(4)in the composite has significantly improved the lithium storage capacity,cycle stability and rate performance of silicon-carbon anode,the synthesized Si-Fe-Fe_(3)O_(4)-C composite material maintains a reversible capacity of 1065 mA·h·g^(-1) after 100 cycles at 0.2 A·g^(-1).The method shows the merits of facile operation procedure,easy industrial production and potential commercial application basing on the supercritical fluid permeability and strong diffusion ability.
作者 卢铚航 马俊凯 杨刚锋 夏阳 甘永平 张俊 张文魁 黄辉 LU Zhihang;MA Junkai;YANG Gangfeng;XIA Yang;GAN Yongping;ZHANG Jun;ZHANG Wenkui;HUANG Hui(College of Materials Science and Engineering,Zhejiang University of Technology,Hangzhou 310014,China)
出处 《复合材料学报》 EI CAS CSCD 北大核心 2023年第1期171-179,共9页 Acta Materiae Compositae Sinica
基金 国家自然科学基金项目-联合重点(U20A20253)。
关键词 硅碳负极 超临界流体 CO_(2) Si-Fe-Fe_(3)O_(4)-C复合材料 储锂性能 silicon-carbon anode supercritical fluid CO_(2) Si-Fe-Fe_(3)O_(4)-C composite material lithium storage performance
  • 相关文献

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部