在基电池的 (局部) 高度电解质中进行离子运输
Helen K Bergstrom1,2, Bryan D McCloskey1,2
1Department of Chemical & Biomolecular Engineering, University of California, Berkeley, California 94720, United States.
概括
高度电解质 (HCE) 改善了离子电池中的转移数 (t+). 然而,将稀释剂添加到局部HCEs中会降低t+,破坏离子跳跃机制.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 物理化学 物理化学
背景情况:
- 高度电解质 (HCE) 和局部 HCE (LHCE) 为更高能量密度的离子电池提供了潜力.
- 它们独特的溶剂结构提供了有利的接口特性.
研究的目的:
- 描述电解质的完整运输特性,包括转移数 (t+).
- 研究HCE和LHCE对离子运输机制的影响.
主要方法:
- 电泳核磁共振 (ENMR) 光谱学. 电泳核磁共振 (ENMR) 光谱学.
- 电化学技术 电化学技术 电化学技术
- 计算 Onsager 的运输系数.
主要成果:
- 与传统电解质相比,HCE中的转移数 (t+) 增加.
- 将稀释剂添加到LHCE中显著降低了t+.
- 观察到的离子运输机制包括HCE中相关的阴离子-阴离子运动和阴离子-阴离子连接体交换,与稀释的LHCE中的反相关运动形成鲜明对比.
结论:
- 协同的离子跳跃机制有助于HCE中的高t+.
- 稀释剂在LHCE中破坏了这些机制,导致降低了t+.
- 只有粘度不能解释观察到的转移数变化.
更多相关视频
相关概念视频
Electrolysis
26.4K
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...
26.4K
Batteries and Fuel Cells
27.4K
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...
27.4K
Electrolyte and Nonelectrolyte Solutions
63.0K
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.
63.0K
Concentration Cells
22.6K
A concentration cell is a type of a voltaic cell constructed by connecting two almost identical half-cells, both based on the same half-reaction and using the same electrode, differing only in the concentration of one redox species. A concentration cell's potential, therefore, is determined only by the concentration difference of the particular redox species.
Consider the following voltaic cell:
Consider the following voltaic cell:
22.6K
Introduction to Electrolytes
10.2K
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...
10.2K
Formation of Complex Ions
23.6K
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...
23.6K


