在层次空洞的MoTe2/C上进行双重设计,具有用于高性能存的离子/电子通道工程
Jiaxi Bai1,2, Lifeng Zhang1, Liyue Xue1
1School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi 710021, P. R. China.
ACS applied materials & interfaces
|March 1, 2024
概括
研究人员为离子电池 (SIB) 开发了空洞的MoTe2/C纳米结构. 由于其独特的空洞结构,MoTe2/C-2材料显示了增强的储能和循环稳定性,为先进的电池材料铺平了道路.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 过渡金属化物是离子电池 (SIB) 的阳极材料,因为它们的活性位点和分层纳米结构.
- 挑战包括结构完整性弱,离子动力学缓慢,阻碍其实际应用.
研究的目的:
- 设计和合成具有空洞纳米结构的新型MoTe2/C复合材料,以提高SIB阳极性能.
- 调查影响储存能力的结构-属性关系.
主要方法:
- 通过调整前体结构,合成具有两个不同的空心纳米结构 (MoTe2/C-1和MoTe2/C-2) 的MoTe2/C复合材料.
- 电化学表征包括静电循环,速率能力测试和全电池组装.
主要成果:
- MoTe2/C-2,在空洞的外部表面上具有自组装的2D柔性纳米薄膜,证明了优越的储存.
- 在300个循环后,MoTe2/C-2在0.1A g-1下实现了276 mAh g-1的特定容量,显著超过了MoTe2/C-1 (201 mAh g-1).
- 观察到MoTe2/C-2的长期循环稳定性异常 (131mAhg-1在2000个循环后的1Ag-1),一个完整的电池为电动手表提供动力.
结论:
- 在MoTe2/C复合材料中空洞纳米结构的合理设计通过缩短离子扩散路径和提高结构稳定性,有效地提高了储存性能.
- 这项工作为下一代SIBs提供了对工程过渡金属化物与多离子/电子迁移通道的见解.
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