凝聚力驱动的分子工程使得高性能准固态电解质能够为长寿命的金属电池提供支持
Zilong Wang1, Longyun Shen2, Yilin Ma1
1Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, 999077, China.
Advanced materials (Deerfield Beach, Fla.)
|April 7, 2025
概括
研究人员开发了一种用于金属电池的新型准固态电解质 (QSSE). 这种新的电解质提高了安全性和性能,为实际的高能量密度电池应用铺平了道路.
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:
- 金属电池中的液体电解质存在安全性和性能限制,阻碍了能量密度.
- 基于聚-1,3-二氧化 (聚-DOL) 的准固态电解质 (QSSEs) 是有前途的,但在库伦比效率和稳定性方面面临挑战.
- 酸提高了效率,但大大减缓了多DOL的聚合,阻碍了实际使用.
研究的目的:
- 开发一种QSSE,提高金属电池的安全性,库伦比效率和长期稳定性.
- 为了克服与酸纳入基于聚DOL的QSSEs相关的缓慢聚合率.
- 为了实现高能量密度金属电池的实际应用.
主要方法:
- 引入了高聚合- 1,1,1-三-2,3-环氧作为共聚合促进剂.
- 将酸集成到基于聚DOL的QSSEs中,使用共聚合促进剂.
- 评估了在LiidiyeCu和LiidiyeLiFePO4细胞中的电解质性能,并扩大到LiidiyeNCM811袋细胞.
主要成果:
- 在25°C时达到2.23mS cm-1的离子导电性.
- 在Li水性Cu细胞中表现出99.34%的库伦比效率.
- 在对称细胞中保持稳定的金属接口1300小时.
- 由于抑制的聚-DOL结晶,使得LiadoseLiFePO4细胞在1C时超过2000个周期.
- 在一个≈1Ah LiwanagNCM811袋式电池中,在60个周期内实现了94.4%的容量保留.
结论:
- 联合聚合战略有效地将酸集成到多DOL QSSEs中,克服了以前的局限性.
- 这种方法显著提高了离子导电性,库伦比效率和长期循环稳定性.
- 开发的QSSE为高性能,现场聚合准固态电池提供了可行的途径,用于实际储能.
更多相关视频
相关概念视频
Aqueous Solutions and Heats of Hydration
14.2K
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...
14.2K
Electrolysis
25.8K
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...
25.8K
Trends in Lattice Energy: Ion Size and Charge
23.5K
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:
23.5K
The Born-Haber Cycle
21.5K
Lattice Energy
21.5K
Molecular and Ionic Solids
16.6K
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...
16.6K
Electrolyte and Nonelectrolyte Solutions
61.9K
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.
61.9K


