相关实验视频
Updated: May 9, 2025

11:52
Microbubble Fabrication of Concave-porosity PDMS Beads
Published on: December 15, 2015
8.3K
活性有机盐 能够实现非侵入性的电解质预化策略
Shu Chen1, Guanbin Wu1, Pai Wang1
1State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Institute of Fiber Materials and Devices, Collaborative Innovation Center of Chemistry for Energy Materials, Research Center of AI for Polymer Science, Fudan University, Shanghai, 200438, China.
Advanced materials (Deerfield Beach, Fla.)
|May 6, 2025
概括
新的电解质添加剂通过防止形成过程中不可逆转的离子损失来提高离子电池的性能. 这种方法可以提高初始库伦比效率和长期稳定性,而不会损坏电池组件.
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:
- 离子电池为离子技术提供了一个有前途的替代方案.
- 由于不可逆转的离子损失,初始库伦比克效率 (ICE) 低于80%阻碍了实际应用.
- 使用固体添加剂的传统预化方法可以降低电极完整性.
研究的目的:
- 为离子电池开发一种新的,非侵入性的预化方法.
- 为了应对细胞形成过程中不可逆转的离子损失的挑战.
- 为了提高离子电池的初始库伦比效率和循环稳定性.
主要方法:
- 利用化学信息学和机器学习来识别硫酸盐 (NaSCN) 作为电解质添加剂.
- 研究了NaSCN在高电压 (3.3-4.0V) 的电解质中的分解行为.
- 采用光谱和显微分析来确认辅溶剂的形成,并评估电极完整性.
主要成果:
- NaSCN电解质添加剂分解释放活性离子并形成有益的辅溶剂.
- 在硬碳P2-Na2/3Ni1/3Mn1/3Ti1/3O2袋式电池中,初始库伦比效率从80.8%提高到95.2%,实现了显著的改进.
- 在400个循环中表现出84.5%的优异容量保留,这表明增强了长期稳定性.
结论:
- 使用NaSCN的电解质预是一种实用和有效的策略,以克服离子缺乏.
- 这种方法可以提高ICE和循环性能,而不会损害电极或电池完整性.
- 这些发现为推进离子电池的商业化提供了可行的解决方案.
相关概念视频
Ionic Strength: Effects on Chemical Equilibria
1.2K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
In this solution, the primary...
1.2K
Ion Exchange
391
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...
391
Colloidal precipitates
440
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
440
Introduction to Electrolytes
8.6K
In humans, electrolytes play a vital role in various physiological processes. Balancing electrolyte levels is essential for normal body functions; their imbalance can be life-threatening. The major electrolytes include sodium, potassium, chloride, calcium, phosphate, and bicarbonate. They are primarily involved in physiological processes, such as nerve signal transmission, membrane trafficking, muscle contraction, buffering body fluids, and balancing water levels in the body.
Role of Sodium
One...
Role of Sodium
One...
8.6K
Electrolyte and Nonelectrolyte Solutions
61.9K
Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
61.9K
Formation of Complex Ions
23.0K
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...
23.0K

