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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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Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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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.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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Cellulose and Pectic Polysaccharides01:15

Cellulose and Pectic Polysaccharides

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 Every plant cell has a cell wall that protects the cell, provides structural support, and gives the cell shape. Cellulose, the main structural component of the plant cell wall, makes up over 30% of plant matter. It is the most abundant organic compound on earth.  Cellulose is an unbranched polysaccharide composed of linear chains of glucose molecules linked by β (1→4) glycosidic bonds.
As a cell matures, its cell wall specializes according to its type. For example, the...
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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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相关实验视频

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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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采用Zwitterionic纤维素基聚合物电解质,通过水溶液造实现高性能固态电池的使用.

Yong Cheng1, Zhichao Cai1, Jinglei Xu1

  • 1State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Materials, Xiamen University, Xiamen, 361005, China.

Angewandte Chemie (International ed. in English)
|May 7, 2024
PubMed
概括
此摘要是机器生成的。

兹威特基纤维素纳米纤维增强聚乙烯氧化物固态电解质,改善离子导电性和机械强度,使更安全,高性能电池.

关键词:
+ 导电性 + 导电性机械强度 机械强度 机械强度固态电池 固态电池 固态电池固态聚合物电解质 固态聚合物电解质这是一种Zwitterionic纤维素.

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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
  • 聚合物科学 聚合物科学

背景情况:

  • 基于聚乙烯氧化物 (PEO) 的固态电池提供高能耗和安全性.
  • 限制包括较低的离子导电性,较差的Li+转移和较弱的机械性能.

研究的目的:

  • 通过结合zwitterionic纤维素纳米纤维 (ZCNF) 来解决PEO电解质限制.
  • 为了同时增强离子导电性,Li+转移和机械强度.

主要方法:

  • 用水溶液造方法制备填充ZCNF的PEO电解质.
  • 描述技术和理论计算,以了解ZCNF的功能.
  • 制造和测试LiFePO4 saqPL-ZCNF saqLi固体全电池和袋电池.

主要成果:

  • ZCNF破坏了PEO结晶,有助于盐分离,并促进了Li+运输.
  • 在60°C时达到5.37×10-4 S/cm的离子导电性和0.62的Li+转移数.
  • 证明了高机械强度 (9.2 MPa) 和临界电流密度 (1.1 mA/cm2).
  • 全细胞显示出出色的速率能力和循环稳定性 (900个周期在5C).
  • 在0.5C和60°C的1000个循环后,囊细胞保持了93.7%的容量.

结论:

  • 兹威特的纤维素纳米纤维有效地克服了PEO电解质的限制.
  • 开发的PL-ZCNF电解质显示了实用固态电池应用的巨大潜力.
  • 同时提高导电性,转移数和机械性能.