"盐中的水"电解质可实现高压的水性离子化学反应
Liumin Suo1, Oleg Borodin2, Tao Gao1
1Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD 20740, USA.
概括
研究人员开发了一种高度的水性电解质, 这一突破扩大了电化学稳定性窗口, 实现更高的电压和能量输出, 以提高电池性能.
科学领域:
- 电化学
- 材料科学
- 能量储存
背景情况:
- 离子电池中的非水性电解质带来了安全,环境和成本方面的挑战.
- 水性电解质提供了更安全的替代品,但受到狭窄的电化学稳定性窗口 (约1.23V) 的限制,限制了电压和能量密度.
- 克服这一局限性对于电池技术的进步至关重要.
研究的目的:
- 为离子电池开发一种具有扩大电化学稳定性窗口的新型水性电解质.
- 展示使用这种先进的水性电解质的功能电池.
- 评估开发的电池系统的性能和稳定性.
主要方法:
- 一种高度缩的水性电解质的配方.
- 电极-电解质相间形成的特征.
- 组装和电化学测试一个完整的离子电池.
- 在不同充电/放电速率下评估循环性能和库伦比效率.
主要成果:
- 通过相间形成成功扩大水性电解质的电化学稳定窗口到大约3.0伏.
- 使用开发的水性电解质演示了一个2.3伏的离子电池.
- 达到1000个周期的稳定循环,几乎100%的库伦比效率.
- 在低 (0.15°C) 和高 (4.5°C) 放电和充电速率下得到确认的高性能.
结论:
- 高度的水性电解质可以克服传统水性系统的电压限制.
- 研发的电解质可以构建高性能,更安全的离子电池.
- 这种进步为更可持续,更具成本效益的储能解决方案铺平了道路.
相关概念视频
Electrolyte and Nonelectrolyte Solutions
72.4K
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.
72.4K
Solvents
71.5K
A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
A...
A...
71.5K
Electrolysis
30.7K
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...
30.7K
Aqueous Solutions and Heats of Hydration
18.3K
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...
18.3K
DC Battery
1.3K
A conductor needs to be a component of a path that creates a closed loop or full circuit to have a continuous current flowing through it. A current starts to flow if an electric field is created inside an isolated conductor that is not part of a full circuit. The conductor quickly develops a net positive charge at one end and a net negative charge at the other. These charges generate an electric field opposite the direction of the applied electric field, which reduces the current. Eventually,...
1.3K
Ionic Strength: Effects on Chemical Equilibria
2.9K
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...
2.9K


