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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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Entropy and Solvation02:05

Entropy and Solvation

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The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
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Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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Entropy02:39

Entropy

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Salt particles that have dissolved in water never spontaneously come back together in solution to reform solid particles. Moreover, a gas that has expanded in a vacuum remains dispersed and never spontaneously reassembles. The unidirectional nature of these phenomena is the result of a thermodynamic state function called entropy (S). Entropy is the measure of the extent to which the energy is dispersed throughout a system, or in other words, it is proportional to the degree of disorder of a...
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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

Complexation Equilibria: Factors Influencing Stability of Complexes

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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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Third Law of Thermodynamics02:38

Third Law of Thermodynamics

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A pure, perfectly crystalline solid possessing no kinetic energy (that is, at a temperature of absolute zero, 0 K) may be described by a single microstate, as its purity, perfect crystallinity,and complete lack of motion means there is but one possible location for each identical atom or molecule comprising the crystal (W = 1). According to the Boltzmann equation, the entropy of this system is zero.
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相关实验视频

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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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通过稳定和快速动力学来最大限度地提高固态电池的接口稳定性.

Xiangkun Kong1,2, Run Gu1,2, Zongzi Jin1,2

  • 1Key Laboratory of Precision and Intelligent Chemistry, University of Science and Technology of China, Hefei, Anhui, China.

Nature communications
|August 23, 2024
PubMed
概括

超快的高温烧结在全固态电池中,在高的岩盐电极和石榴石电解质之间创建稳定的接口. 这大大提高了接口阻力和循环性能,解决了ASSLB技术的关键挑战.

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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:

  • 阳性电极的电解质接口对于全固态电池 (ASSLB) 的性能至关重要,特别是对于石榴石型固态电解质 (SSEs),如Li6.4La3Zr1.4Ta0.6O12 (LLZTO).
  • 现有的挑战包括在实现良好的固体-固体接触和保持化学稳定性之间进行权衡,导致界面性能差和循环寿命有限.
  • 过渡金属迁移是高岩盐正电极 (HE-DRXs) 在与液体电解质一起使用时已知的问题.

研究的目的:

  • 为了实现HE-DRX和LLZTO SSE之间的热力学兼容性和适当的物理接触.
  • 构建一个高度稳定的正电极和电解质接口,以提高ASSLB性能.
  • 克服传统接口的局限性,减轻过渡金属迁移等问题.

主要方法:

  • 使用超高速高温烧结 (UHS) 来处理HE-DRX和LLZTO.
  • 研究了由此产生的接口特性,包括接口电阻和物理接触.
  • 评估了在高温下结合UHS处理接口的ASSLBs的电化学性能.

主要成果:

  • 通过UHS实现了HE-DRX和LLZTO之间的热力学兼容性和足够的物理接触.
  • 构建了一个高度稳定的接口,在25°C下将接口电阻降低到31.6 Ω·cm2 (与LiCoO2下载LLZTO相比减少了700倍).
  • 在150°C下表现出极好的电化学性能:平均特异容量为239.7 ± 2 mAh/g在25 mA/g下,在100个循环后保持95%的容量.

结论:

  • 该UHS策略有效地在基于石榴石的ASSLB中创建了一个稳定和低电阻的正电极和电解质接口.
  • 这种方法成功地防止过渡金属迁移,这是液体电解质的HE-DRX中常见的问题.
  • 这些发现表明,通过解决关键接口挑战,开发高性能ASSLB是一个有希望的途径.