表面活性剂辅助制备(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)3O4高熵氧化物及储锂性能
Surfactant assisted synthesis of(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)3O4 high-entropy oxide and its lithium-ion storage performance
李肖 1张惠 1王之昕 1郭磊 2仝翠芝 1冒爱琴3
作者信息
- 1. 国网冀北电力有限公司 智能配电网中心,河北 秦皇岛 066100
- 2. 国网冀北电力有限公司,北京 100054
- 3. 安徽工业大学 材料科学与工程学院,安徽 马鞍山 243032
- 折叠
摘要
为了进一步提高锂离子电池负极材料(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)3O4 高熵氧化物(HEO)的倍率性能,以金属硝酸盐为金属源、尿素为沉淀剂、十二烷基三甲基溴化铵(DTAB)为表面活性剂,利用水热法制备了具有单一尖晶石结构的(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)3O4 纳米材料(HEO-DTAB).采用XRD、SEM、EDS、比表面及孔径分析仪对HEO-DTAB进行了表征,并对其制作的电极进行了电化学性能测试.结果表明,与未添加DTAB制备的材料(HEO)相比,HEO-DTAB具有更小的颗粒尺寸(10.8 nm)、更均匀的分散性、更大的比表面积(27.88 m2/g)和均一的孔结构;HEO-DTAB制作的电极在0.2 A/g下展示了较高的初始放电比容量(1308 mA·h/g)和库仑效率(82.5%),循环25圈时放电比容量为1263 mA·h/g;在1 A/g下,循环150 圈后的放电比容量高达1053 mA·h/g,是 HEO 制作的电极的 8.4 倍.HEO-DTAB 的纳米结构使其电极材料具有较大的赝电容贡献率(91.1%,扫描速率为1.5 mV/s),大幅度提升了材料的比容量和倍率性能.
Abstract
In order to further improve the rate performance of anode material(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)3O4 high-entropy oxide(HEO)in lithium-ion batteries,spinel-structured(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)3O4 nanocrystalline powder(HEO-DTAB)was synthesized by hydrothermal method using metal nitrate as metal source,urea as precipitant and dodecyl trimethyl ammonium bromide(DTAB)as surfactant.The powders obtained were characterized by XRD,SEM,EDS,specific surface area and pore size analyzer,followed by evaluation on electrode electrochemical performance.The results showed that the HEO-DTAB possessed smaller particle size(10.8 nm),more uniform dispersion,larger specific surface area(27.88 m2/g)and more uniform pore distribution in comparison to HEO without surfactant DTAB.The HEO-DTAB electrode exhibited a higher initial specific capacity(1308 mA·h/g),and an initial coulomb efficiency(82.5%),with a discharge specific capacity of 1263 mA·h/g at 0.2 A/g after 25 cycles.The discharge specific capacity at 1 A/g after 150 cycles was 1053 mA·h/g,which was 8.4 times that of HEO electrode.The nanostructure of HEO-DTAB led to a pronounced pseudocapacitance contribution ratio(91.1%at scan rate of 1.5 mV/s)of the electrode,significantly improving the specific capacity and rate performance of the material.
关键词
锂离子电池/尖晶石型高熵氧化物/负极材料/十二烷基三甲基溴化铵/水热法/赝电容/有机电化学Key words
lithium-ion batteries/spinel high-entropy oxide/anode materials/dodecyl trimethyl ammonium bromide/hydrothermal method/pseudo-capacitance/electro-organic chemistry引用本文复制引用
基金项目
国网冀北电力有限公司项目(B70144220039)
出版年
2024
NETL
NSTL
万方数据