ZnFe2O4@Ti3C2Tx复合材料的制备和储锂性能
Preparation and lithium storage properties of ZnFe2O4@Ti3C2Tx composites
张伟 1李少青 2张沿江 1刘翔 2周耐根2
作者信息
- 1. 宜春国轩电池有限公司,江西 宜春 336000
- 2. 南昌大学物理与材料学院,江西 南昌 330031
- 折叠
摘要
高比容量和高稳定的负极材料一直是锂离子电池领域里追求的目标.本研究通过将高比容量的双金属氧化物ZnFe2O4和分散性好的Ti3C2Tx MXenes材料复合,成功开发了一种高性能复合负极材料.结构分析结果表明,ZnFe2O4@Ti3C2Tx复合负极材料被成功制备,尺寸在100 nm左右的ZnFe2O4颗粒均匀地分布在片层状MXenes的表面.电化学性能测试结果表明,复合材料的初始可逆比容量达641.6 mA·h·g-1,首次库伦效率为62.4%.在0.1 A·g-1下电极循环100圈后,容量可以稳定在584.9 mA·h·g-1.在1 A·g-1大电流密度下循环300圈,容量仍有508.1 mA·h·g-1.ZnFe2O4@Ti3C2Tx复合负极材料的高比容量主要来自于ZnFe2O4的转化反应和合金反应,而MXenes层则起到分散和缓解其膨胀应力的作用,两者协同提升了复合材料的整体性能.随着ZnFe2O4的含量增加,复合负极材料的比容量升高,但循环稳定性却有所下降.
Abstract
The pursuit of high specific capacity and stability in anode materials has long been a critical goal in the development of lithium-ion batteries.In this study,a high-performance composite anode material was successfully developed by compositing the high specific capacity bimetallic oxide ZnFe2O4 with Ti3C2Tx MXenes possessing excellent dispersibility.The structural analysis confirmed the successful preparation of ZnFe2O4@Ti3C2Tx composite anode material,and ZnFe2O4 nanoparticles with a size of approximately 100 nm were uniformly dispersed on the surface of the MXenes layer.The electrochemical performance test revealed that the initial reversible specific capacity of the composite reached 641.6 mA·h·g-1,and the first coulombic efficiency was 62.4%.After 100 cycles at a current density of 0.1 A·g-1,the capacity was stabilized at 584.9 mA·h·g-1.Even under high current density conditions(1 A·g-1)for 300 cycles,the capacity remained at 508.1 mA·h·g-1.The high specific capacity of the composite anode material was primarily attributed to the ZnFe2O4 conversion reaction and alloying reaction,while the presence of MXenes layer served to disperse and alleviate expansion stress,which collectively enhanced the overall performance of the composite.The specific capacity of the composite anode material increased with the increase in ZnFe2O4 content,but there was a decline in cyclic stability.
关键词
ZnFe2O4@Ti3C2Tx/复合材料/材料制备/储锂性能Key words
ZnFe2O4@Ti3C2Tx/composite materials/material preparation/lithium storage properties引用本文复制引用
出版年
2024
NETL
NSTL
万方数据