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相关概念视频

Ion Exchange01:17

Ion Exchange

424
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...
424
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

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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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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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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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一种固体聚合物电解质与无机丰富的阴极电解质介面,使5.1V固态离子电池成为可能.

Chunyi Zhi1, Yue Hou2, Yiqiao Wang2

  • 1City University of Hong Kong, Department of Physics and Materials Science, Kowloon, 999077, Hong Kong, HONG KONG.

Angewandte Chemie (International ed. in English)
|May 16, 2025
PubMed
概括

研究人员开发了一种新型的聚合物电解质 (PVTF) 与高压固态离子电池的牺牲添加剂 (LiDFP). 这种组合稳定了阴极,并实现了出色的循环和速率性能,为更安全,更能源密集的电池铺平了道路.

关键词:
添加剂 LiDFP 的添加剂.阴极电解质相间阶段的高压电机.固体聚合物电解质的电解质

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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:

  • 固体聚合物电解质 (SPEs) 对于开发安全,能量密度高的固态离子电池 (SSLIB) 至关重要.
  • 实现高压SSLIBs受到缺乏电化学稳定的SPEs和超过5V的阴极降解的阻碍.

研究的目的:

  • 使用量子化学计算对高压SSLIB进行选和开发稳定的SPE.
  • 为了提高SSLIB中的LiNi0.5Mn1.5O4 (LNMO) 阴极的电化学稳定性.

主要方法:

  • 量子化学计算被用来选聚乙烯化物-co-trifluoroethylene-co-chlorotrifluoroethylene (PVTF) 的抗氧化能力.
  • 一种牺牲添加剂,二酸 (LiDFP),被纳入PVTF SPE中,形成一个阴极电解质介相 (CEI) 层.
  • 电化学性能通过使用LiidiyePVTF1.0@LiDFPidiyeLNMO细胞进行评估,并使用表征方法来研究相间进化.

主要成果:

  • 该PVTF聚合物表现出强大的抗氧化能力,适合稳定的SPEs.
  • PVTF1.0@LiDFP SPE成功形成了高质量的CEI层,稳定了LNMO阴极.
  • 在5.1V时,LiidiyePVTF1.0@LiDFP धूपLNMO电池表现出极好的循环性能 (>200个循环) 和速率能力 (高达2°C).

结论:

  • 抗氧化物PVTF聚合物和LiDFP添加剂的组合有效地稳定SSLIB中的高压阴极.
  • 这种方法为开发高性能,安全和稳定的高压SSLIB提供了强大的战略.
  • 该研究为先进的固态电池技术的未来发展提供了宝贵的见解.