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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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Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
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Lewis Structures of Molecular Compounds and Polyatomic Ions02:54

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To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
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Drug design is a dynamic field that involves discovering and developing new medications based on specific biological targets. This process heavily relies on structure-activity relationships (SAR) and quantitative structure-activity relationships (QSAR) to guide the design and optimization of efficient drugs.
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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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离子电池阳极的多孔Si基材料:结构设计和现场/操作性特征.

Yiming Zhang1,2, Chang Luo1, Xijun Liu3

  • 1"The Belt and Road Initiative" Advanced Materials International Joint Research Center of Hebei Province, School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300401, China.

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多孔阳极克服了离子电池中的体积扩张问题. 先进的现场表征验证了这些设计,为高性能阳极铺平了道路.

关键词:
离子电池是一种离子电池.在现场/操作的特征描述.孔隙结构是多孔结构.阳极是一种阳极.

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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
  • 纳米技术纳米技术

背景情况:

  • 阳极为离子电池提供高容量,但受到体积膨胀和容量衰减的影响.
  • 多孔架构是解决循环过程中的机械不稳定性的关键策略.
  • 现场/操作特征技术对于理解电池材料中的动态过程至关重要.

研究的目的:

  • 审查最近在多孔阳极设计方面的进展.
  • 检查in situ/operando表征在验证这些设计中的作用.
  • 突出材料工程和高性能阳极的先进表征之间的协同作用.

主要方法:

  • 系统审查关于多孔阳极设计的文献.
  • 对应于阳极的 in situ/operando 特性技术进行批判性分析.
  • 评估表明有孔架构的机械验证的研究.

主要成果:

  • 多孔结构有效地适应体积变化,增强电极完整性和循环寿命.
  • 现场/操作技术提供了孔阳极结构演变和界面变化的直接证据.
  • 合理的材料设计和先进的表征的结合加快了稳定的阳极的发展.

结论:

  • 多孔架构对于实现下一代电池中阳极的潜力至关重要.
  • 在现场/操作性表征对于理解和优化多孔阳极性能是不可或缺的.
  • 结合材料设计和先进表征的协同方法为实现高性能储能解决方案提供了明确的道路.