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Redox Equilibria: Overview01:23

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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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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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Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
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可逆氧氧还氧化具有增强的结构稳定性,通过对层氧化物阴极的共价性调制来提高结构稳定性.

Shuyuan Chen1,2, Chen Cheng1,2, Xiao Xia1,2

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概括

引入强有力的共价Ni─O键稳定了用于离子电池的P2型基层氧化物. 这种方法提高了结构完整性,抑制了氧气释放,提高了电池的性能和耐用性.

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基于Mn的分层氧化物.共同性调制的共价性调制.氧氧氧氧氧还氧反应反应阶段过渡 阶段过渡离子电池是一种离子电池.

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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
  • 无机化学 无机化学 有机化学

背景情况:

  • 基于P2型的分层氧化物是离子电池的有希望的阴极材料,因为它们的高容量和易于合成.
  • 然而,这些材料在循环过程中遭受结构不稳定,相位过渡和不可逆转的氧气释放,导致容量减弱.

研究的目的:

  • 为离子电池开发一种稳定的P2型基分层氧化物阴极材料.
  • 通过采用共价度调制策略来解决结构扭曲和不可逆转的氧气释放.

主要方法:

  • 通过将强有力的共价-氧 (Ni─O) 键引入P2型基层氧化物结构,实施了共价调制策略.
  • 合成的材料Na0.6Mg0.15Mn0.7Ni0.15O2以其结构和电化学性能为特征.

主要成果:

  • 引入Ni─O债券显著提高了过渡金属层框架的结构刚性,减轻了扭曲,并保护了地方协调环境.
  • 共价Ni─O键有效地稳定了氧气环境,抑制了循环过程中不可逆转的氧气释放.
  • 由此产生的Na0.6Mg0.15Mn{0.7}Ni{0.15}O2阴极表现出完全固体溶液的行为,体积变化低于0.9%,并增强了晶格氧氧氧还氧反应的可逆性.

结论:

  • 交度调制是提高P2型基层氧化物结构完整性和电化学性能的关键策略.
  • 强大的Ni─O键在稳定晶体结构和调节氧氧还原化学方面发挥着至关重要的作用,导致耐用和高能量密度的离子电池阴极.