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相关概念视频

The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...

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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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通过软硬X射线吸收光谱的结合,对电化学Li-ion脱Li1-xCo1/3Ni1/3Mn1/3O2电极系统的电荷补偿机制的研究.

Won-Sub Yoon1, Mahalingam Balasubramanian, Kyung Yoon Chung

  • 1Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973, USA. wonsuby@bnl.gov

Journal of the American Chemical Society
|December 8, 2005
PubMed
概括

在充电过程中,离子主要驱动Li1-xCo1/3Ni1/3Mn1/3O2阴极中的电荷补偿. 氧气也积极参与氧化还原过程,这种行为与相关.

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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
  • 固态化学 固态化学

背景情况:

  • 层层的过渡金属氧化物是离子电池的关键阴极材料.
  • 了解充电补偿机制对于优化电池性能至关重要.

研究的目的:

  • 调查Li1-xCo1/3Ni1/3Mn1/3O2.2初始充电期间的充电补偿机制.
  • 阐明不同金属离子 (Ni,Mn,Co) 和氧在氧化还原过程中的作用.

主要方法:

  • 在金属K边缘的现场硬X射线吸收光谱 (XAS).
  • 在OK边缘和金属L边缘软XAS.
  • 进行X射线近边结构 (XANES) 和扩展的X射线吸收细结构 (EXAFS) 分析.

主要成果:

  • 离子 (Ni2+) 主要被氧化以弥补脱.
  • 表面离子氧化为Ni3+,而散装离子进一步氧化为Ni4+.
  • 氧气K-edge XAS证实在氧气位点发生了显著的电荷补偿.

结论:

  • 主电荷补偿机制涉及氧化,具有明显的表面和散装行为.
  • 氧气积极参与氧化还原过程,这种现象归因于的存在.
  • 这些发现为分层阴极材料的电化学行为提供了洞察力.