蛋白质界面凝向无穿式和无状酸电池
Shao-Jian Zhang1, Junnan Hao1, Han Wu1
1School of Chemical Engineering, The University of Adelaide, Adelaide, SA, 5005, Australia.
Advanced materials (Deerfield Beach, Fla.)
|July 6, 2024
概括
水性-电池中的丝蛋白添加剂可以防止阴极穿效应,并改善阳极可逆性. 这一战略提高了大规模应用的储能性能和耐用性.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 水性- (Zn-I2) 电池为电网规模的能源存储提供了潜力.
- 挑战包括 (I2) 阴极穿效应和较差的 (Zn) 阳极可逆性.
研究的目的:
- 开发一种使用丝蛋白 (SP) 的新型界面凝策略,同时解决穿效应并提高 Zn 阳极可逆性.
- 为了提高Zn-I2电池的整体电化学性能和耐用性.
主要方法:
- 介绍丝蛋白 (SP) 作为水性Zn-I2电池电解质中的添加剂.
- 研究SP在电场下的双向迁移.
- 在阴极和阳极接口分析状沉物的形成.
- 电化学特性包括特定容量,库伦比效率,速率性能和循环稳定性.
- 一个500mAh的Zn-I2袋式电池的制造和测试.
主要成果:
- SP有效地抑制了I2穿效应,通过与聚酸一起形成凝状沉物.
- SP在Zn阳极上起到保护层的作用,提高了可逆性并抑制了树突.
- 实现了高特异性容量 (215mAhg-1在1°C),库伦比效率 (99.5%在1°C),以及优异的速率能力 (170mAhg-1在50°C).
- 经过证明的延长耐用性 (10°C时 6000 个循环) 和高 Zn 阳极可逆性 (99.7% 平均 CE 在 2 mA cm-2).
- 一个500 mAh的袋式电池实现了80 Wh kg-1的能量密度和超过1000个循环.
结论:
- 使用丝蛋白的界面凝策略提供了对阴极和阳极的同时调制.
- 这种方法显著提高了水性Zn-I2电池的性能和稳定性.
- 这些发现突显了SP在实用,大规模储能应用中的潜力.
相关概念视频
02:48Ionic Bonding and Electron Transfer
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.
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...
03:45Formation of Complex Ions
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
01:09Colloidal precipitates
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
01:28Ionic Association
The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.