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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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Acid halides are reduced to alcohols in the presence of a strong reducing agent like lithium aluminum hydride.
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
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Few compounds act as strong acids. A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a...
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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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对于全固态电池的扩散控制的Li-Al合金负电极.

Yuju Jeon1, Dong Ju Lee1, Hongkui Zheng2

  • 1Aiiso Yufeng Li Family Department of Chemical and Nano Engineering, University of California, San Diego, La Jolla, CA, USA.

Nature communications
|November 1, 2025
PubMed
概括
此摘要是机器生成的。

合金电极为固态电池提供高容量. 这项研究表明,富含的β-LiAl相能够快速运输,克服降解挑战,实现稳定,高速的性能.

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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
  • 储能 储能 储能 储能 储能 储能

背景情况:

  • 金属合金对全固态电池来说是有前途的,因为它具有高容量和低成本.
  • 挑战包括化学机械降解和有限的固态离子运输.
  • 了解-合金中的扩散机制对于电极设计至关重要.

研究的目的:

  • 为所有固态电池设计和研究-合金负电极.
  • 阐明扩散在Li-Al合金不同阶段中的作用.
  • 在完整的细胞中实现高速率能力和长期稳定性.

主要方法:

  • 在缺乏的α (LixAl1,0 ≤ x ≤ 0.05) 和富含的β (0.95 ≤ x ≤ 1) 阶段研究了扩散机制.
  • 制造的合金电极具有密集的结构和密切的电解质接口.
  • 组装并测试了基于LiNi0.8Co0.1Mn0.1O2的全电池与开发的电极.

主要成果:

  • 富含的β-LiAl相作为高导电通道,其扩散系数比α相高出10个数量级.
  • 在全电池运行中实现了7 mA cm-2的高速率能力.
  • 最优的Li0.5Al1和LiNi0.8Co0.1Mn0.1O2配置在2000个周期中表现出稳定的循环,在4 mA cm-2时保持83%的容量.

结论:

  • -合金,特别是富含的合金,在全固态电池中显著增强了离子运输.
  • 开发的电极设计克服了关键的降解和运输限制,实现了高速和稳定的电池性能.
  • 这项工作为下一代固态电池中先进的合金负电极提供了途径.