摘要
采用ZIF-67作为自牺牲模板,制备了嵌入式的四氧化三钴/碳布(Co_(3)O_(4)/CC)柔性自支撑负极材料。碳布基体中交错的导电网络结构以及Co_(3)O_(4)氧缺陷的存在,加速了锂离子的传输、改善了结构稳定性。Co_(3)O_(4)/CC负极材料表现出了卓越的电池性能,在5 A/g的大电流密度下循环1000次后放电比容量仍能达到518 mAh/g。Co_(3)O_(4)/CC负极的高容量主要来源于赝电容效应,而原位拉曼光谱中表面/近表面超快速氧化还原反应的发生佐证了赝电容的存在。
The embedded Co_(3)O_(4)/CC flexible self-supporting anode material was prepared by using ZIF-67 as self-sacrificing template.Due to the interlaced conductive network structure and the existence of Co_(3)O_(4)oxygen defect in carbon fabric matrix,the lithium ion transport is accelerated and the structural stability is improved.The Co_(3)O_(4)/CC anode material shows excellent battery performance,and the discharge specific capacity can still reach 518 mAh/g after 1000 cycles at 5 A/g high current density.The high capacitance of Co_(3)O_(4)/CC anode is mainly due to pseudocapacitance effect,and the presence of pseudocapacitance is supported by ultra-fast surface/near-surface REDOX reaction detected by in-situ Raman spectroscopy.
作者
周佳盈
李双鹏
肖煌
高云
夏晓红
ZHOU Jiaying;LI Shuangpeng;XIAO Huang;GAO Yun;XIA Xiaohong(MOE Key Laboratory for the Green Preparation and Application of Functional Materials,School of Materials Science and Engineering,Hubei University,Wuhan 430062,China)
出处
《华南师范大学学报（自然科学版）》
CAS
北大核心
2023年第2期1-9,共9页
Journal of South China Normal University(Natural Science Edition)
基金
湖北省自然科学基金杰出青年基金项目(2019CFA079)
武汉市应用基础前沿项目(2020010601012163)。
关键词
赝电容
负极材料
四氧化三钴
锂离子电池
pseudocapacitance
anode materials
cobalt tetroxide
lithium-ion battery
