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相关概念视频

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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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Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
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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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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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Acid halides are reduced to alcohols in the presence of a strong reducing agent like lithium aluminum hydride.
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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Li1.6AlCl3.4S0.6:用于固态电池的低成本和高性能固体电解质.

Tej P Poudel1,2,3, Ifeoluwa P Oyekunle2,3, Michael J Deck2,3

  • 1Materials Science and Engineering Program, The Graduate School, Florida State University 2005 Levy Ave. Tallahassee FL 32310 USA yhu@fsu.edu.

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研究人员开发了一种新的固体电解质,酸 (Li1.6AlCl3.4S0.6),使用简单的削工艺. 这种材料显著提高了下一代全固态电池的离子导电性.

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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:

  • 固体电解质 (SE) 对先进的可充电电池至关重要,但在成本,可扩展性和离子导电性方面存在局限性.
  • 四氨基酸盐具有成本效益,但具有较低的Li+导电性和高的激活能量.
  • 开发高性能,经济的SE对于将全固态电池 (ASSB) 商业化至关重要.

研究的目的:

  • 为了合成一种新合金合金合物固体电解质,提高了离子导电性.
  • 研究新材料的结构和运输特性.
  • 评估开发的SE在全固态电池应用中的性能.

主要方法:

  • 从廉价的前体中单阶段机械化学炼合成合金合物 (Li1.6AlCl3.4S0.6).
  • 使用高分辨率X射线衍射 (XRD) 和6Li神奇角旋转 (MAS) NMR光谱进行了表征.
  • 使用初始分子动力学 (AIMD) 模拟的计算分析.

主要成果:

  • 在25°C时实现了离子导电性从LiAlCl4的0.008 mS cm-1显著增加到Li1.6AlCl3.4S0.6的0.18 mS cm-1.
  • 结构分析显示了四面体协调的LiCl-S八面体,促进了3DLi+运输.
  • AIMD模拟证实了一个增强的3D Li+迁移网络,扩散率增加.
  • 所有固态电池半电池都表现出高速率和稳定的循环性能.

结论:

  • 合成的Li1.6AlCl3.4S0.6固体电解质提供了一种具有增强离子导电性的经济有效的解决方案.
  • 混合Cl-S离子子网和由此产生的结构特征促进了高效的3D Li+运输.
  • 这种材料显示出高性能和稳定的全固态电池的巨大潜力.