用于高压和低温离子电池的固定弱溶解电解质
Xu Liu1, Jingwei Zhang1, Xuanyu Yun1
1State Key Laboratory of Advanced Chemical Power Sources, Frontiers Science Center for New Organic Matter, Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin, 300071, China.
Angewandte Chemie (International ed. in English)
|June 14, 2024
概括
新的固定弱溶解电解质 (AWSEs) 实现了稳定,快速充电和低温电池性能. 这些先进的电解质在极端条件下在离子电池中保持高容量保留.
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:
- 对于先进的电池来说,同时实现高氧化/还原稳定性,快速离子溶解和宽温度离子导电性至关重要.
- 当前的电解质往往无法满足这些苛刻的要求,限制了电池的性能,特别是在低温和高充电率下.
研究的目的:
- 设计和合成用于高能量密度电池的新型固定弱溶解电解质 (AWSEs).
- 研究电解质溶剂的分子设计原理,以提高界面稳定性和离子传输.
- 在各种温度条件下评估AWSEs在离子电池中的性能.
主要方法:
- 基于聚氧甲基乙烯的溶剂的分子设计,具有延长的链长,以创建AWSEs.
- 电解质性质的电化学表征,包括离子导电性和界面稳定性.
- 使用AWSEs,制造和测试石墨 (Gr) 底下LiNi0.8Co0.1Mn0.1O2 (NCM811) 囊细胞.
- 在室温和-20°C下进行长期循环性能评估.
主要成果:
- 在AWSEs中,Li+协调弱且有效的溶剂定,使离子溶解速度快并具有高离子导电性.
- 单盐/单溶剂AWSEs防止了石墨阳极中的溶剂协同干扰,并表现出高氧化稳定性NCM811阴极.
- 由于丰富的溶解外,在两个电极上观察到无机丰富的介面相的形成.
- 在室温下1000个循环后,Gridose NCM811袋式电池实现了70.85%的容量保留,在-20°C下400个循环后达到75.86%的容量保留.
结论:
- AWSEs的分子设计为开发克服传统系统局限性的电解质提供了一个可行的策略.
- 在极端温度条件下有效运行的高能/功率电池系统,AWSEs提供了一个有前途的途径.
- 这项研究突出了量身定制的电解质溶剂结构在实现下一代电池技术方面的潜力.
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
13.0K
10:03Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
25.5K
相关概念视频
02:21Electrolyte and Nonelectrolyte Solutions
62.8K
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.
62.8K
02:42Aqueous Solutions and Heats of Hydration
14.6K
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...
14.6K
02:54Molecular and Ionic Solids
17.1K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
17.1K
00:42Ionic Bonds
118.2K
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...
118.2K
02:54Ions as Acids and Bases
23.7K
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:
23.7K
02:48Ionic Bonding and Electron Transfer
41.4K
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.
41.4K