高稳定的阳极由水溶性酸功能化双网络结合剂启用
Fang Wu1, Jiarun Liu1, Ziyu Yang1
1School of Materials and Energy, University of Electronic Science and Technology of China (UESTC), Chengdu 611731, China.
ACS applied materials & interfaces
|April 26, 2024
概括
一种新的酸功能化粘合剂增强了高能离子电池的阳极. 这种先进的材料提高了电极稳定性和循环性能,为下一代电池铺平了道路.
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
- 聚合物化学 聚合物化学
背景情况:
- (Si) 为离子电池提供了高容量,但由于体积变化很大,其循环稳定性不佳.
- 开发强大的粘合剂对于稳定Si阳极和实现高能量密度电池至关重要.
研究的目的:
- 合成和评估一种用于稳定阳极的新型酸功能化水性双网结合剂 (Alg (Ni) -PAM-TA).
- 调查粘合剂的结构性质关系及其对电极完整性和电化学性能的影响.
主要方法:
- 合成由酸和聚胺组成的水性双网结合剂,用酸功能化.
- 粘合剂性能的表征,包括粘合力和网络弹性.
- 使用开发的粘合剂对Si阳极进行电化学测试.
- 分子动力学 (MD) 模拟以了解绑定器网络行为.
主要成果:
- -PAM-TA粘合剂与纳米颗粒和Cu薄膜具有强烈的相互作用,形成具有特殊粘合力的弹性网络.
- MD模拟显示,酸的分子内结和聚合增加,有助于结合物的稳定性.
- 使用Alg (Ni) - PAM-TA结合剂的Si阳极显示出显著增强的循环稳定性.
- 在200个循环后,在0.84 A g-1下实现了1863.4 mAh g-1的容量保留.
结论:
- 酸功能化的水性双网结合剂有效地稳定了Si阳极,克服了体积膨胀问题.
- 这种粘合剂设计为开发高能量密度离子电池提供了一个有前途的战略.
- 通过酸结合形成分子内网络是提高粘合剂性能的关键.
相关概念视频
03:13Intermolecular Forces
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 bonds, and dispersion...
02:30Water: A Bronsted-Lowry Acid and Base
The reaction between a Brønsted-Lowry acid and water is called acid ionization. For example, when hydrogen fluoride dissolves in water and ionizes, protons are transferred from hydrogen fluoride molecules to water molecules, yielding hydronium ions and fluoride ions:
00:57Cationic Chain-Growth Polymerization: Mechanism
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the generated carbocation,...
01:17Ion Exchange
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...
01:30The Electrical Double Layer
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
01:29Leveling Effect
In acid-base chemistry, the leveling effect refers to the limitation imposed by the solvent on the strength of acids and bases in solution. When a base stronger than the solvent's conjugate base is used, it deprotonates the solvent until the base is entirely consumed, making it ineffective against weaker acids. Conversely, an acid stronger than the solvent's conjugate acid protonates the solvent until the acid is depleted, rendering it ineffective against weaker bases. Essentially, the solvent...