摘要
为解决商用石墨负极材料理论比容量低、快充性能差及安全性不足的问题,构建一种新型自支撑复合电极,实现了锂离子电池综合电化学性能的提升。以碳布(CC)为柔性基底,采用水热法在其表面原位生长Co_(3)O_(4)/ZnO异质结结构,随后进行热处理,成功制备了自支撑Co_(3)O_(4)@ZnO//CC负极材料;利用XRD、SEM、TEM、XPS等表征手段分析了其微观结构与组成,并通过电化学测试系统评估了其储锂性能。结果表明,Co_(3)O_(4)@ZnO三维多孔纳米片阵列可缓解体积变化并促进电子传输;在2.00 mA/cm^(2)的电流密度下,Co_(3)O_(4)@ZnO//CC电极的首圈放电比容量与充电比容量分别为3.96、3.28 mA·h/cm^(2),首圈库仑效率达82.83%,循环100圈后容量保持率为56.40%,其循环稳定性和倍率性能均优于Co_(3)O_(4)//CC和ZnO//CC电极。
To address the issues of low theoretical specific capacity,poor fast-charging performance,and insufficient safety in commercial graphite anode materials,a new type of self-supporting composite electrode was constructed,which achieved an improvement in the comprehensive electrochemical performance of lithium-ion batteries.Using carbon cloth(CC)as a flexible substrate,a Co_(3)O_(4)/ZnO heterojunction structure was grown in situ on its surface via the hydrothermal method,followed by heat treatment,successfully preparing a self-supporting Co_(3)O_(4)@ZnO//CC anode material.Microstructural and compositional analyses were conducted using characterization techniques such as XRD,SEM,TEM,and XPS,while electrochemical tests were employed to evaluate its lithium storage performance.Results demonstrated that the three-dimensional porous nanosheet array of Co_(3)O_(4)@ZnO effectively mitigates volume changes and facilitates electron transport.The Co_(3)O_(4)@ZnO//CC electrode exhibited an initial discharge and charge specific capacity of 3.96 and 3.28 mA·h/cm^(2)at 2.00 mA/cm^(2) current density,respectively,with a coulombic efficiency of 82.83%in the first cycle and a capacity retention rate of 56.40%after 100 cycles.Both its cycling stability and rate performance outperformed those of Co_(3)O_(4)//CC and ZnO//CC electrodes.
作者
朱娅娅
崔丽华
杨克锋
伍金柔
王肖玲
王洋超
余伟
ZHU Yaya;CUI Lihua;YANG Kefeng;WU Jinrou;WANG Xiaoling;WANG Yangchao;YU Wei(School of Materials Science and Engineering,North Minzu University,Yinchuan Ningxia 750021,China;School of Physics,Zhengzhou University,Zhengzhou Henan 450052,China)
出处
《石油化工高等学校学报》
2025年第6期13-21,共9页
Journal of Petrochemical Universities
基金
国家级大学生创新创业训练计划项目(202411407003)
宁夏自然科学基金项目(2023AAC03291)。
关键词
双金属氧化物
异质结结构
电极材料
自支撑电极
锂离子电池
Bimetallic oxides
Heterojunction structure
Electrode materials
Self-supporting electrode
Lithium-ion batteries
