通过电解质中的有机盐补偿K离子,用于实用的K离子电池
Wenwen Wang1, Guanbin Wu1, Pai Wang1
1Fudan University, Department of Macromolecular Science, CHINA.
Angewandte Chemie (International ed. in English)
|February 27, 2025
概括
硫酸 (KSCN) 添加剂为K离子电池提供100%的活性离子. 这一突破通过克服离子短缺和提高阳极性能,使容量增加了三倍.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 离子电池在阴极中的活性离子可用性有限 (<70%) 和第一次循环不可逆转的重大损失 (高达20%).
- 现有的离子补偿策略不足,可能会损害细胞完整性.
研究的目的:
- 开发一种新的方法,在K离子电池中提供足够的活性K离子.
- 提高K离子电池系统的电化学性能和容量.
主要方法:
- 硫酸盐 (KSCN) 作为电解质添加剂的引入.
- 在3.6V下氧化分解KSCN以释放活性K离子并形成硫素 ((SCN) 2) 溶剂.
- 无监督机器学习和化学信息学用于分子识别和属性分析.
- 用硬碳阳极和基于K的阴极进行囊细胞的电化学测试.
主要成果:
- 通过氧化分解,KSCN添加剂成功地提供了高达100%的活性K离子.
- 鉴定出硫素 ((SCN) 2) 辅溶剂,具有有利的电化学特性和兼容性.
- 通过促进K离子溶解, (SCN) 2辅溶剂提高了阳极速的能力.
- 一个硬碳的K0.5Mg0.15[Mn0.8Mg0.05]O2囊细胞显示,其容量增加了三倍,提供了58%的活性K离子.
结论:
- 硫酸是一种可行的添加剂,用于有效的K离子补偿K离子电池.
- 开发的方法提供了一个切实可行的解决方案,以克服活性离子短缺,提高电池容量和性能.
- 这种方法在开发高性能K离子储能系统方面取得了重大进展.
更多相关视频
11:04Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
12.9K
10:03Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
25.4K
相关概念视频
02:54Ions as Acids and Bases
23.1K
Salts with Acidic Ions
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
Salts are ionic compounds composed of cations and anions, either of which may be capable of undergoing an acid or base ionization reaction with water. Aqueous salt solutions, therefore, may be acidic, basic, or neutral, depending on the relative acid-base strengths of the salt’s constituent ions. For example, dissolving the ammonium chloride in water results in its dissociation, as described by the equation:
23.1K
01:33Introduction to Electrolytes
9.6K
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...
9.6K
01:19Ionic Strength: Effects on Chemical Equilibria
1.3K
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...
1.3K
00:42Ionic Bonds
117.7K
Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
117.7K
03:00Electrolysis
25.9K
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...
25.9K
01:12Ionic Strength: Overview
1.2K
The ionic strength of a solution is a quantitative way of expressing the total electrolyte concentration of a solution. This concept was first introduced in 1921 by two American physical chemists, Gilbert N. Lewis and Merle Randall, while describing the activity coefficient of strong electrolytes. During the calculation of ionic strength (I or μ), all the cations and anions are considered. However, the concentration (c) of an ion with a greater charge number (z) has a greater contribution...
1.2K