纳米花状MoO3-x负极的制备及电化学性能
Preparation and electrochemical properties of nanoflower MoO3-x anodes
侯雪阳 1程帆 1阮苗 1杜浩飞 1张雪峰 1方钊1
作者信息
- 1. 西安建筑科技大学 冶金工程学院,西安 710055
- 折叠
摘要
三氧化钼(MoO3)由于自身理论比容量高、热稳定性好以及二维层状结构,成为目前广受关注的锂离子电池负极材料之一.但是,由于MoO3自身的本征导电率低以及转换反应过程中严重的体积膨胀,限制了MoO3的大规模应用.本文通过质子-电子共掺杂以及高能纳米化方式,在MoO3中引入了氧空位和纳米花结构,制备了纳米花MoO3-x材料,并将其用作锂离子电池负极.通过引入氧空位以及进行纳米化处理,有效改善了材料的导电性能,扩大了范德华间隙,缓冲了材料在长期充放电过程中的体积膨胀.结果表明,所制备的纳米花MoO3-x具有良好的锂离子存储性能,在2 A/g的电流密度下能够循环500圈,比容量能够达到591 mA∙h/g,显著高于以往报道的三氧化钼基负极材料.
Abstract
Molybdenum trioxide(MoO3)has become one of the most popular anode materials for lithium-ion batteries due to its high theoretical specific capacity,good thermal stability and two-dimensional layered structure.However,the low intrinsic conductivity of MoO3 and the rapid capacity decay limit the large-scale application of MoO3 during cycling.In this paper,oxygen vacancies and nanoflower structures were introduced into MoO3 by proton-electron co-doping and high-energy nanosizing,and N-MoO3-x materials were prepared and used as anode for lithium-ion batteries.By introducing oxygen vacancies and nanosizing,the conductivity of the material is effectively improved,the van der Waals gap is expanded and the volume expansion of the material is buffered during long-term charge and discharge.The results show the prepared nanoflower MoO3-x has good lithium storage performance.It can cycle 500 cycles at current density of 2 A/g and the specific capacity can reach 600 mA∙h/g.The N-MoO3-x materials is significantly higher than the previously reported molybdenum trioxide-based anode materials.
关键词
三氧化钼/锂离子电池负极材料/质子-电子共掺杂/氧空位/长循环稳定性Key words
MoO3/lithium ion battery anode material/proton-electron co-doping/oxygen vacancy/long cycle stability引用本文复制引用
基金项目
国家自然科学基金(52274353)
国家自然科学基金(51974219)
出版年
2024
NETL
NSTL
万方数据