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相关概念视频

Redox Reactions01:24

Redox Reactions

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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Redox Reactions01:27

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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
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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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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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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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在低成本的氧化固体电解质中嵌入基于铁的还氧化化学,用于高性能全固态电池.

Zhimin Zhou1,2,3, Pushun Lu1,2,4, Suzhe Liang1,2,4

  • 1Eastern Institute for Advanced Study, Ningbo Institute of Digital Twin, Eastern Institute of Technology, Ningbo, P. R. China.

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概括

研究人员开发了一种新的基于铁的固体电解质 (LiZrFeOCl-1604) 用于全固态电池 (ASSB). 这种具有成本效益的材料提高了能量密度和电池安全性,为下一代储能解决方案铺平了道路.

关键词:
有活性化物固体电解质的电解质.所有固态电池都是固态电池.阴解剂 固体 电解剂 电解剂高能量密度,高能量密度.

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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:

  • 化物固体电解质 (SE) 对于全固态电池 (ASSB) 是非常重要的,因为它们的高离子导电性和电化学稳定性.
  • 然而,它们有限的电化学活性和高成本阻碍了ASSB的能量密度和实际应用.

研究的目的:

  • 通过将Fe2O3整合到Li2ZrCl6 (LZC) 中,开发出一种具有成本效益和电化学活性的固体电解质.
  • 为了使固体电解质内的基于Fe的氧化还原化学能够提高电池性能.

主要方法:

  • 通过将Fe2O3纳入LZC,合成一个氧化固体电解质 (Li1.6ZrFe0.8O1.2Cl5.6,LiZrFeOCl-1604).
  • 材料结构,离子导电性和电化学性质的表征.
  • 使用LiFePO4 (LFP) 阴极和新型固体电解质制造和测试ASSB.

主要成果:

  • LiZrFeOCl-1604 呈现出高离子导电率 (2.55 mS cm-1) 和可逆容量 (163 mAh g-1).
  • 带有LFP阴极的复合电极实现了高容量 (321.6 mAh g-1) 和能量密度 (982.1 Wh kg-1),比不活跃的LZC增加了101.8%.
  • ASSBs表现出极好的循环稳定性,在1C的800个循环中保持92.7%的容量.

结论:

  • 开发的电化学活性氧化固体电解质提高了ASSB的能量密度和成本效益.
  • 非同步的充放电行为提高了实际的能量密度,并减轻了过度充电/过度放电等安全风险.
  • 这项工作为先进,更安全,高性能全固态电池提供了有前途的途径.