相关实验视频

Updated: Jun 20, 2025

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Published on: August 12, 2013

在缩的电解质中稳定金属:电极电位和固体电解质相间形成的影响

Anusha Pradhan¹, Shoma Nishimura¹, Yasuyuki Kondo¹

¹SANKEN, Osaka University, 8-1, Mihogaoka, Ibaraki, Osaka 567-0047, Japan. yamada@sanken.osaka-u.ac.jp.

Faraday discussions

|July 17, 2024

概括

缩的电解质通过稳定接口来提高金属电池的效率. 这项研究揭示了电解质结构和潜力如何影响coulombic效率和固体电解质间相形成,以提高电池性能.

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
电池技术电池技术

背景情况:

(Li) 金属阳极对于高能量密度电池至关重要,但由于寄生性电解质降解,其库伦比效率 (CE) 较低.
缩的电解质是稳定金属/电解质接口并增强CE的有希望的策略,尽管底层机制需要澄清.

研究的目的:

调查缩电解质中的液体结构变化与化/脱落CE之间的关系.
阐明电极电位和固体电解质介相 (SEI) 形成在改善CE中的作用.

主要方法:

使用了一个模型电解质系统,包括LiN(SO2F) 2 (LiFSI) 和1,2-二氧化乙 (DEE) 在不同的盐度.
测量Li电极潜力 (E_Li) 相对于铁氧化还原潜力.
分析了SEI形成,并将其与电解质结构和电化学性能相关联,与基于1,2-二甲基乙烯 (DME) 的电解质进行比较.

主要成果:

与DME相比,观察到与DEE不同的Li电极电位趋势,归因于不同的Li+和FSI-离子对状态.
证明了两种电解质的重叠的E_Li-CE图表,表明E_Li是CE的一个主要因素.
发现广泛的离子配对将FSI-减小潜力向上转移,促进稳定的FSI-衍生的无机SEI,从而增强CE.

结论:

电极潜力和稳定的SEI层的形成都对增加电解质中的化/脱落CE至关重要.
该研究提供了关于缩电解质,特别是LiFSI/DEE提高金属阳极性能的机制的见解.

更多相关视频

Three-electrode Coin Cell Preparation and Electrodeposition Analytics for Lithium-ion Batteries

Three-electrode Coin Cell Preparation and Electrodeposition Analytics for Lithium-ion Batteries

Published on: May 22, 2018

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

Published on: December 20, 2016

相关概念视频

Ionic Strength: Effects on Chemical Equilibria

Ionic Strength: Effects on Chemical Equilibria

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...

Ionic Bonding and Electron Transfer

Ionic Bonding and Electron Transfer

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.

Complexation Equilibria: Factors Influencing Stability of Complexes

Complexation Equilibria: Factors Influencing Stability of Complexes

In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...

Formation of Complex Ions

Formation of Complex Ions

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...

Trends in Lattice Energy: Ion Size and Charge

Trends in Lattice Energy: Ion Size and Charge

An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:

Standard Electrode Potentials

Standard Electrode Potentials

On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...