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构建用于离子电池的微纳米结构基阳极
Chen Su1, Kurbanov Mirtemir Shodievich2, Yi Zhao3
1School of Materials Science & Engineering and Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology, Hebei University of Technology, Tianjin 300130, People's Republic of China.
Nanotechnology
|May 17, 2024
概括
我们开发了一种新阳极材料,可以克服离子电池的体积膨胀问题. 这种新材料为下一代储能提供了高容量和稳定性.
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
- 纳米技术纳米技术
背景情况:
- 离子电池 (LIB) 中的阳极因循环过程中的显著体积变化而遭受机械电化学故障.
- 这种体积扩张导致容量衰减和电池寿命缩短,阻碍了高能量密度LIBs的发展.
研究的目的:
- 设计和合成一个亚微纳米结构的基于的材料,以减轻LIB阳极中的机械电化学合问题.
- 通过解决传统阳极的局限性,提高LIBs的循环稳定性和能量密度.
主要方法:
- 通过磁热降解制备高Si/SiO2含量 (84.6%重量%) 的基于Si的中孔性复合子微球 (M-Si/SiO2/CS).
- 在合成的M-Si/SiO2亚微球上应用碳涂层工艺.
- 电化学表征,包括特定容量,循环稳定性和电极厚度膨胀率测量.
主要成果:
- 在100个循环后,M-Si/SiO2/CS阳极在0.5 A g-1下保持了740 mAh g-1的高特异容量.
- 观察到电极厚度胀率显著降低,达到63%.
- 经过250个循环后,表现出了优异的长期循环稳定性,容量为570mAhg-1在1Ag-1下.
结论:
- M-Si/SiO2/CS复合材料的层次结构和SiO2框架协同增强了储存性能.
- 球形形态和半孔缓冲Si扩张,缩短离子扩散路径,提高稳定性.
- 无形SiO2矩阵支持结构完整性,并促进形成稳定的固体电解质间相 (SEI) 层.
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