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相关概念视频

Batteries and Fuel Cells03:12

Batteries and Fuel Cells

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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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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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在阴极表面上设计稳定分解产品,使高压全固态电池成为可能.

Lanting Qian1, Yangyang Huang1, Cameron Dean1

  • 1Department of Chemistry and the Waterloo Institute of Nanotechnology, University of Waterloo, 200 University Ave, Waterloo ON, N2L 3G1, Canada.

Angewandte Chemie (International ed. in English)
|November 12, 2024
PubMed
概括

一种新型的涂层有效地保护硫化物固体电解质免受氧化,显著提高了高压固态电池的性能和稳定性.

关键词:
在 DFT 方面,它是最重要的.阿尔吉罗酸电解质的电解质通过设计进行阴极涂层.阴极-电解质接口接口固态电池是一种固态电池.

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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
  • 固态电池 固态电池是什么

背景情况:

  • 硫化物固体电解质为固态电池提供高离子导电性.
  • 它们的低氧化潜力 (~2.5 V) 限制了与高压丰富的阴极 (例如,LiNixCoγMn1−x−γO2,x≥0.8) 的兼容性.
  • 电解质的氧化分解导致电池性能和循环寿命差.

研究的目的:

  • 为富含的阴极开发一种有效的,合规的,薄薄的涂层.
  • 抑制硫化物固体电解质的氧化分解.
  • 提高固态电池的电化学性能和稳定性.

主要方法:

  • 密度功能理论 (DFT) 的计算指导材料设计.
  • 在富含的NMC85阴极活性物质上制造纳米涂层.
  • 固态电池的电化学测试使用Li6PS5Cl固体电解质和涂层/未涂层阴极.

主要成果:

  • 在200个循环 (2.84.3V与Li+/Li) 后,NMC85上的纳米涂层提高了容量保留率,达到82%,而未涂层的阴极则为56%.
  • 涂层细胞表现出更高的速度性能和更高的容量.
  • 由LiPO2F2分解产物形成的稳定无形阴极-电解质介相,保护硫化物电解质免受氧化.

结论:

  • 具有成本效益的,合规的涂层有效地使得使用硫化物电解质与高压丰富的阴极有效.
  • 以DFT为指导,基于分解产品的涂层策略显著提高了电池的性能和稳定性.
  • 这种方法为开发基于硫化物电解质的先进全固态电池提供了有希望的途径.