键和CEI的双重功能提高了离子电池的性能
Zhiyuan Lin1, Li Zhang2, Chenxiao Lin1
1College of New Energy, Ningbo University of Technology, Ningbo 315336, China.
ACS applied materials & interfaces
|October 23, 2024
概括
一种新型的添加剂通过形成保护性阴极-电解质相间膜 (CEI) 来增强离子电池中的电解质稳定性. 这种双重功能策略提高了先进电池应用的循环性能和抗氧化能力.
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:
- 电解质稳定性对于离子电池的性能至关重要,通常受到溶剂分子降解的限制.
- 内部溶剂分子相互作用显著影响电解质的寿命和安全性.
- 开发增强电解质抗氧化和结构稳定的策略至关重要.
研究的目的:
- 为提高电解质稳定性和性能,引入一套双功能战略.
- 调查结的作用和现场阴极电解质介相 (CEI) 制造.
- 为了解决商业电解质在高性能离子电池中的局限性.
主要方法:
- 使用了添加剂N-(4-(2,5-dioxo-4-oxazolidinyl) butyl) -2,2,2-trifluoroacetamide (DOTFA),具有特定的功能单元.
- 采用键相互作用来诱导溶剂分子重组和CEI膜形成.
- 使用DOTFA添加剂在阴极表面上现场制造的CEI薄膜.
主要成果:
- DOTFA添加剂形成了坚固的CEI膜,增强了电解质的抗氧化能力.
- 键稳定了溶剂分子,改善了高压结构完整性.
- 在现场CEI膜保护了阴极免受副作用反应,改善了接口兼容性.
- 使用NCM811阴极和DOTFA添加剂的离子电池表现出色的循环性能.
结论:
- 双重功能战略有效地增强了电解质抗氧化和结构稳定性.
- 现场CEI形成是保护电池组件的可行方法.
- 添加剂DOTFA为开发下一代离子电池提供了有前途的方法,其寿命和性能得到了改善.
相关概念视频
01:04Hydrogen Bonds
8.0K
A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
8.0K
02:48Ionic Bonding and Electron Transfer
41.3K
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.
41.3K
00:42Ionic Bonds
118.0K
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...
118.0K
03:12Batteries and Fuel Cells
27.1K
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...
27.1K
01:08Covalent Bonds
7.2K
Overview
When two atoms share electrons to complete their valence shells, they create a covalent bond. An atom's electronegativity—the force with which shared electrons are pulled towards an atom—determines how the electrons are shared. Molecules formed with covalent bonds can be either polar or nonpolar. Atoms with similar electronegativities form nonpolar covalent bonds; the electrons are shared equally. Atoms with different electronegativities share electrons unequally,...
When two atoms share electrons to complete their valence shells, they create a covalent bond. An atom's electronegativity—the force with which shared electrons are pulled towards an atom—determines how the electrons are shared. Molecules formed with covalent bonds can be either polar or nonpolar. Atoms with similar electronegativities form nonpolar covalent bonds; the electrons are shared equally. Atoms with different electronegativities share electrons unequally,...
7.2K
03:13Intermolecular Forces
57.7K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
57.7K