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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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通过全固态电池的电极结构和组合设计延长Si / C极寿命.

Wei He1,2, Horyung Ji1,2,3, Mariia Platonova1,2,3

  • 1Chaire de Chimie du Solide et de l'Energie, UMR 8260, Collège de France, 11 Place Marcelin Berthelot, 75231 Paris Cedex 05, France.

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概括

研究人员通过将-合金添加到-碳复合材料中来改进全固态电池 (ASSB) 的阳极. 这一策略提高了循环稳定性和关键电流密度,这对于高性能电池至关重要.

关键词:
三电极电池的设计设计.3.75Si 化前化在Si/C复合体阳极中.所有固态电池都是固态电池.离子/电子透的透.

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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
  • 电池技术 电池技术

背景情况:

  • 阳极在全固态电池 (ASSB) 中面临挑战,原因是体积变化和陷,导致容量减弱.
  • 碳复合材料可以改善电子运输,但不能完全解决陷问题.

研究的目的:

  • 为了减轻陷,并提高ASSB中的基于的阳极的性能.
  • 为了研究将Li$_{3.75}$Si合金纳入Si/C复合材料的作用,使用双层和混合电极架构.

主要方法:

  • 制造双层和混合电极,将Li$_{3.75}$Si合金合并到Si/C复合材料中.
  • 在ASSB中制造的电极的电化学循环和性能评估.
  • 使用定制的三电极电池设置测量电极临界电流密度 (CCD).
  • 将固体电解质 (SE) 添加到混合电极中,以评估其对离子和电子导电性的影响.

主要成果:

  • 双层电极显示出更好的循环性能,但在高电流密度下容易出现软短路.
  • 混合电极的CCD增加了三倍,但其循环稳定性有限.
  • 将固体电解质添加到混合电极中显著改善了循环性能,在配合富含Ni的阴极时,达到0.8 mA/cm$^2$的500个循环和3 mA/cm$^2$的183个循环.

结论:

  • 通过结合Li$_{3.75}$Si合金和固体电解质来调节电极结构和组成,有效地提高了基于的阳极的性能.
  • 开发的电极策略为创建持久,高速率和无基SiASSB提供了洞察力.