对电解质添加剂的研究以及对离子电池固体电解质间相的形成机制的研究
Pratahdeep Gogoi1, Xiaoli Ge1, Mayuresh Janpandit1
1Department of Chemistry, The State University of New York, Buffalo, New York 14260, United States.
ACS applied materials & interfaces
|February 19, 2025
概括
一种新的电解质添加剂,转-4,5-二乙烯碳酸盐 (DFEC),可以提高离子电池 (NIB) 的性能. 与标准添加剂相比,DFEC提高了循环稳定性和容量保留.
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 (NIB) 正在成为大规模储能离子电池 (LIB) 的可行替代品.
- 在NIB技术中,一个关键的挑战是固体电解质间相 (SEI) 的形成和稳定性,其理解程度不如LIB.
- 乙烯碳酸盐 (FEC) 是NIB中常见的电解质添加剂,根据其在LIB中的成功使用而改编.
研究的目的:
- 为了研究一种新的二替代电解质添加剂,转-4,5-二乙烯碳酸盐 (DFEC),用于NIBs.
- 评估DFEC对NIB的自行车性能和SEI特性的影响.
- 为了比较DFEC与传统FEC添加剂的性能.
主要方法:
- 使用5%的DFEC添加剂在高C率 (高达20C) 的硬币电池的电化学测试.
- 电分析研究,以评估骑自行车时的SEI稳定性.
- 表面分析技术包括现场拉曼,飞行时间二次离子质谱 (TOF-SIMS) 和X射线光电子光谱 (XPS).
主要成果:
- 使用5%DFEC的硬币电池表现出优越的容量保留,在20C的7000个周期后保持93.84%.
- 在长时间循环时,DFEC形成的SEI表现出增强的稳定性.
- 表面分析显示,与DFEC一起,SEI的组成更富含无机成分,促进了Na+离子的移动性,并抑制了SEI的进一步增长.
结论:
- 变-4,5-二乙烯碳酸盐 (DFEC) 显著提高了离子电池的循环稳定性和性能.
- 增强的性能归因于DFEC形成了一个更稳定的,富含无机的SEI层.
- DFEC为开发高性能和稳定的NIB提供了一个有前途的替代添加剂.
相关概念视频
Ionic 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
Formation of Complex Ions
23.2K
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...
23.2K
Ionic Bonding and Electron Transfer
41.1K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
41.1K
Ionic 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
Electrolysis
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
Batteries and Fuel Cells
26.9K
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...
26.9K


