在现场形成连续和密集的无机酸盐基SEI,用于高性能金属电池
Yuying Liu1, Tao Huang2, Zhencheng Huang1
1Graphene Composite Research Center, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, China.
Small (Weinheim an der Bergstrasse, Germany)
|November 7, 2024
概括
研究人员开发了一种用于金属电池 (LMB) 的新型电解质,可以防止树的生长. 这一突破提高了高性能LMB的循环稳定性和安全性.
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
- 电池技术 电池技术
背景情况:
- 金属电池 (LMB) 面临着诸如树生长,循环效率差,电解质燃烧等挑战,阻碍了实际应用.
- 电极-电解质接口在电池性能和稳定性方面发挥着至关重要的作用.
研究的目的:
- 为高稳定的LMB开发一种先进的电解质.
- 为了研究固体电解质接口 (SEI) 的形成和特性,以抑制树.
主要方法:
- 在碳酸盐溶剂中配制一种新型电解质,含有三种盐.
- 用高负载NMC阴极对LMB进行电化学测试.
- 低温传输电子显微镜 (Cryo-TEM) 和密度功能理论 (DFT) 计算用于SEI分析.
主要成果:
- 设计的电解质使20毫克厘米-2的NMC阴极在LMB中实现了高循环稳定性,在4.5V的200个循环后实现了89.89%的容量保留.
- 一个富含无机的双层SEI在现场形成,有效地抑制了树的生长.
- DFT计算和Cryo-TEM揭示了SEI的密集结构和无机组件连续性的重要性.
结论:
- 新型电解质及其产生的酸盐基双层SEI显著提高了LMB的稳定性和安全性.
- 了解SEI结构,特别是无机连续性和密度,对于抑制树突来说至关重要.
- 这项研究为开发先进,稳定的LMB提供了一条途径,可以应用于其他电池系统.
更多相关视频
10:03Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
25.4K
11:04Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
Published on: December 20, 2016
12.9K
相关概念视频
03:12Batteries and Fuel Cells
27.0K
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...
27.0K
02:54Trends in Lattice Energy: Ion Size and Charge
23.7K
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:
23.7K
02:48Ionic Bonding and Electron Transfer
41.2K
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.
41.2K