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相关概念视频

Electrolysis03:00

Electrolysis

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In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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Voltaic/Galvanic Cells02:47

Voltaic/Galvanic Cells

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Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
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相关实验视频

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Protocol of Electrochemical Test and Characterization of Aprotic Li-O2 Battery
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有机阴极电解质间相 达到4.8V LiCoO2

Chaocang Weng1, Meijia Qiu2, Bingfang Wang3

  • 1School of Physics and Electronic Science, Shanghai Key Laboratory of Magnetic Resonance, Engineering Research Center for Nanophotonics & Advanced Instrument, Ministry of Education, East China Normal University, Shanghai, 200241, China.

Angewandte Chemie (International ed. in English)
|December 10, 2024
PubMed
概括
此摘要是机器生成的。

开发稳定的高压离子电池至关重要. 这项研究引入了一种离子液体电解质,形成一种保护性有机阴极电解质间相 (CEI),显著提高了电池的性能和寿命.

关键词:
捐赠者号码 捐赠者号码高压电解质 高压电解质LiCoO2 的副作用是什么?有机阴极电解质相间阶段.

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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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相关实验视频

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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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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:

  • 稳定高压离子电池,特别是使用氧化物 (LCO) 的电池,是一个重大挑战.
  • 有效的阴极电解质间相 (CEI) 形成对于减轻高电压下有害反应至关重要.
  • 现有的无机CEI,通常基于LiF,在高压LCO应用中表现不足.

研究的目的:

  • 开发一种新的电解质系统,以提高高压离子电池的稳定性和循环性能.
  • 通过使用具有高捐助数添加剂的离子液体电解质 (ILE) 来研究阴极电解质间相 (CEI) 的形成和特性.
  • 证明拟议的CEI在抑制LCO和其他高压阴极材料中的降解机制方面的有效性.

主要方法:

  • 使用一种含有高捐助数添加剂的离子液体电解质 (ILE).
  • 研究的Li//LCO电池在高切断电压 (4.7V/4.8V) 循环运行.
  • 分析了形成的CEI的组成和特性,重点关注C-F债券的特征.

主要成果:

  • 在4.7V/4.8V的Li//LCO电池中实现了高容量保留 (86.9%/74.2%在0.5C的100个循环后)
  • 发现了富含C-F债券的稳定有机CEI的形成,这归因于高捐助数添加剂.
  • 在其他高压系统 (Li//LiNi0.6Co0.2Mn0.2O2在4.8V和Li//LiNi0.5Mn1.5O4在4.95V) 中,即使在60°C,也证明了卓越的循环稳定性.

结论:

  • 开发的有机CEI富含C-F键,有效地使阴极表面无活性,抑制相位过渡,溶解和气体演变.
  • 这种有机CEI战略为显著提高离子电池中高压阴极的电化学稳定性提供了一个有希望的途径.
  • 这些发现为开发更高效,更耐用的高压离子电池技术铺平了道路.