长周期固态金属电池的自由残留溶剂的离子双极相互作用诱导封装
Menglu Li1,2,3, Hanwen An1,2,3, Yajie Song1,2
1MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China.
Journal of the American Chemical Society
|November 9, 2023
概括
一种新的策略是捕获固态电池中的聚乙烯化物 (PVDF) 电解质中的残留溶剂. 这提高了循环稳定性,实现了超过2000个循环,保持了80%的容量.
科学领域:
- 材料科学
- 电化学
- 聚合物科学
背景情况:
- 聚乙烯化物 (PVDF) 电解质为固态电池提供高离子导电性和机械强度.
- 在PVDF电解质中的反应性残留溶剂显著限制了电池循环稳定性和寿命.
研究的目的:
- 开发一种捕获PVDF电解质中的残留溶剂的策略.
- 提高固态电池的循环稳定性和性能.
主要方法:
- 使用二玻酸盐 (LiDFOB) 添加剂来增强离子双极相互作用.
- 研究了+离子与残留溶剂分子之间的相互作用.
- 在电极-电解质接口上分析了离子衍生界面的形成.
主要成果:
- LiDFOB添加剂通过重新分配 Li+ 电阳性状态有效地捕获剩余溶剂.
- 修改后的协调环境促进了动力稳定的离子衍生界面的形成.
- 固态电池显示了超过2000个循环,平均库伦比效率为99.9%,容量保留为80%.
结论:
- 自由溶剂捕获策略成功地减轻了界面的副作用.
- 针对剩余溶剂的监管对于延长固态电池的循环寿命至关重要.
- 这种方法为开发高性能固态电池提供了有前途的途径.
相关概念视频
Intermolecular Forces
58.5K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
58.5K
Induced Electric Dipoles
4.2K
A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
4.2K
Aqueous Solutions and Heats of Hydration
14.7K
Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
14.7K
Formation of Complex Ions
23.7K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
23.7K
Intermolecular Forces in Solutions
33.8K
The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...
33.8K
Ionic Bonding and Electron Transfer
41.6K
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.
41.6K


