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Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

41.3K
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. 
41.3K

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一种新型的4-甲异酸盐添加剂,用于构建高性能离子电池的固体阴极-电解质接口.

Jinfeng Zheng1, Yu Qiu1, Shengnan Liao1

  • 1School of Physics and Materials Science, Nanchang University, Nanchang, Jiangxi, 330031, P. R. China.

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概括

一种新的电解质添加剂,4-二异酸 (4-FBC),为离子电池创建了一个稳定的阴极-电解质接口 (CEI). 这提高了分层金属氧化物阴极的性能和耐用性.

关键词:
4 - - 甲异酸.阴极材料的材料是正极材料.阴极 - 电解质接口接口电解质添加剂是一种电解质添加剂.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
  • 储能 储能 储能 储能 储能 储能

背景情况:

  • 稳定的阴极-电解质接口 (CEI) 对于高性能分层金属氧化物阴极 (NCM) 具有至关重要的作用.
  • CEI的退化导致电池性能和寿命降低.

研究的目的:

  • 开发一种新的电解质添加剂,以提高NCM阴极中的CEI稳定性.
  • 为了研究添加剂对离子电池电化学性能的影响.

主要方法:

  • 合成和表征4-二异酸 (4-FBC) 作为一个电解质添加剂.
  • 制造和电化学测试NCM523/SiO@石墨袋全细胞与没有4-FBC.
  • 分析CEI膜的组成和形态.

主要成果:

  • 4-FBC形成了一个强大的,均的,富含的CEI膜,在阴极表面上有一个环骨架.
  • 与对照细胞 (39.1%) 相比,使用1%的4-FBC添加剂的细胞显著改善了容量保留 (81.3%在200个循环后).
  • 添加剂减轻了电解质分解和过渡金属离子溶解.

结论:

  • 4-FBC是一种有效的电解质添加剂,可提高NCM阴极的稳定性和性能.
  • 这一策略证明了高压和丰富的正极材料的普遍性.
  • 这些发现支持高能量密度离子电池的实际应用.