极性梯度CEI驱动极速快速充电离子电池的快速溶解
Ying Mo1, Wang Zhou1, Shiru Wu1
1College of Materials Science and Engineering, Hunan Joint International Laboratory of Advanced Materials and Technology of Clean Energy, Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology, Hunan University, Changsha, 410082, China.
Angewandte Chemie (International ed. in English)
|September 27, 2025
概括
研究人员使用电解质添加剂为离子电池 (PIB) 开发了一种新的阴极电解质介相 (CEI). 这种定制的CEI通过改善离子运输和抑制副作用反应来提高快速充电能力和稳定性.
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:
- 离子电池 (PIB) 显示出由于优越的K+运输,其快速充电具有前途.
- 挑战包括阴极电解质介相 (CEI) 的副作用反应,缓慢的K+运输和阴极降解.
- 这些问题限制了高性能快充PIB的开发.
研究的目的:
- 为快速充电的 PIB 量身定制设计一个极性梯度 CEI.
- 加强K+运输和CEI的结构稳定性.
- 在快速充电条件下改进GDP的整体性能和周期寿命.
主要方法:
- 使用电解质添加剂来修改CEI,创建极性梯度.
- 外部B-F/B-O物种被引入,用于在溶解过程中处理溶剂分子.
- 内部K2CO3和KF组件被纳入,以促进K+的运输和稳定性.
主要成果:
- 修改后的CEI显著改善了KFeHCF/石墨全细胞中的电荷转移和扩散动力学.
- 观察到压抑的Fe溶解,以及阴极结构和相间的增强稳定性.
- 全电池实现了高可逆容量 (126.5 mAh g-1 在0.02 A g-1, 95.8 mAh g-1 在1 A g-1),并保持了5 A g-1 (67 mAh g-1) 和低温 (-10°C) 的容量.
结论:
- 定制的极性梯度CEI有效地解决了快速充电PIB的关键挑战.
- 优化CEI组件和结构对于实现高性能和稳定性至关重要.
- 这一战略为开发先进的快充离子电池技术提供了一个有前途的途径.
相关概念视频
Ion Exchange
1.1K
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...
1.1K
Induced Electric Dipoles
4.7K
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...
4.7K
Dielectric Polarization in a Capacitor
5.9K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
5.9K
Intermolecular Forces
69.9K
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...
69.9K
Electrolysis
30.2K
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...
30.2K
Electrochemical Gradient and Channel Proteins: An Overview
4.3K
An electrochemical gradient is a fundamental concept in biology and chemistry. It regulates the movement of ions across cell membranes. This movement is influenced by two factors:
The electrical gradient: The electrical gradient across cell membranes refers to the difference in electric charge between the inside and outside of a cell. This difference drives the movement of ions towards or away from the cells. For instance, if the inside of the cell is more negatively charged relative to...
The electrical gradient: The electrical gradient across cell membranes refers to the difference in electric charge between the inside and outside of a cell. This difference drives the movement of ions towards or away from the cells. For instance, if the inside of the cell is more negatively charged relative to...
4.3K


