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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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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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Acid Halides to Alcohols: LiAlH4 Reduction01:19

Acid Halides to Alcohols: LiAlH4 Reduction

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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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减少气体触发了阴极表面重建,以实现实用的全固态电池中稳定的阴极-电解质接口.

Bingkai Zhang1,2, Zhiwei He1, Tiefeng Liu3

  • 1Guangdong Provincial Key Laboratory of Plant Resources Biorefinery, School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, China.

Advanced materials (Deerfield Beach, Fla.)
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概括

一种新的气体-固体界面减少反应 (GSIRR) 在阴极上创建了表面重建层 (SRL),显著提高了全固态离子电池的性能和稳定性.

关键词:
这是一个全固态的全固态.阴极是指一个阴极.离子电池是一种离子电池.固体电解质是一种固体电解质.表面的重建 表面的重建

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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:

  • 阴极和硫化物固体电解质 (SE) 之间的接口兼容性对于全固态离子电池 (ASSLB) 至关重要.
  • 阴极中的表面氧反应性限制了电化学性能.

研究的目的:

  • 开发一种新的表面重建层 (SRL),以增强ASSLB中的阴极-电解质接口.
  • 为了研究表面修饰的气体-固体界面减少反应 (GSIRR) 机制.

主要方法:

  • 使用GSIRR将CoO/Li2CO3 SRL应用于LiCoO2 (LCO) 阴极上.
  • 评估电化学性能,包括容量,可循环性和速率能力.
  • 使用硫化物固体电解质 (Li10GeP2S12和Li3PS4) 测试了接口稳定性.

主要成果:

  • 经过SRL修改的LCO阴极表现出高容量 (149.7 mAh g-1),卓越的循环性 (84.63%的400个循环的保留率) 和优越的速率能力 (86.1 mAh g-1在2°C).
  • 在高负荷阴极中表现出极好的稳定性.
  • 在LCO和各种硫化物SE之间增强了界面稳定性.

结论:

  • 通过形成一个保护性的SRL,GSIRR战略有效地减轻了阴极电解质反应.
  • 该GSIRR机制显示广泛适用于不同的阴极材料 (例如,LiNi0.8Co0.1Mn0.1O2) 和还原气体 (H2S,CO).
  • 通过GSIRR进行表面重建是设计高性能ASSLB的一个有希望的方法.