相关实验视频
Updated: Jun 8, 2025
09:04
Fabrication of VB2/Air Cells for Electrochemical Testing
Published on: August 5, 2013
11.9K
/多电子转换实现了高能量密度的-电池
Jiajin Zhao1, Yan Chen1, Mengyan Zhang1
1College of Environment and Chemical Engineering, Hebei Key Laboratory of Applied Chemistry, State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, P. R. China.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|November 5, 2024
概括
高价值的水性- (Zn-I2) 电池通过在水中的深溶解剂 (WiDES) 电解质中使用乙烯基醇 (EG) 实现增强性能. 这一创新提高了先进储能系统的容量和能量密度.
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) 电池具有前景,但受到低能量密度和单电子反应的限制.
- 开发高价值阴极反应是提高Zn-I2系统电压和性能的关键.
研究的目的:
- 为了提高水性Zn-I2电池的能量密度和反应动力学.
- 探索以乙烯基醇 (EG) 作为水中深溶解剂 (WiDES) 电解质中的辅溶剂的使用.
- 为了实现高价值氧化还原反应 (I+/I0/I-) 和Cl-/Cl0可逆性.
主要方法:
- 采用了水中的深溶解剂 (WiDES) 电解质与乙烯基醇 (EG) 作为辅溶剂.
- 通过光谱表征和计算,研究了EG在Zn2+溶解和水键网络中断中的作用.
- 组装和测试水性Zn-I2电池电池和袋式电池.
主要成果:
- 实现了987 mAh gI2-1的特殊特异性容量和1278 Wh kgI2-1的能量密度,这与无EG电解质相比显著改善.
- 提高了库伦比克效率 (CE),从68.2%提高到98.7%.
- 在袋式电池中证明了强大的循环稳定性,容量为3.72 mAh cm-2和能量密度为4.52 mWh cm-2.
结论:
- 乙烯基醇有效地改变了电解质结构,促进了高价值反应,并提高了Zn-I2电池的性能.
- 开发的WiDES电解质可以实现高容量和高能量密度的水性Zn-I2电池.
- 这项研究为先进,高性能水性-储能系统铺平了道路.
相关概念视频
03:00Electrolysis
26.0K
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...
26.0K
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
02:48Ionic 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
03:12Ionization Energy
33.3K
The amount of energy required to remove the most loosely bound electron from a gaseous atom in its ground state is called its first ionization energy (IE1). The first ionization energy for an element, X, is the energy required to form a cation with 1+ charge:
33.3K
03:45Formation of Complex Ions
23.4K
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...
23.4K
03:02Standard Electrode Potentials
43.5K
On comparing the reactivity of silver and lead, it is observed that the two ionic species, Ag+ (aq) and Pb2+ (aq), show a difference in their redox reactivity towards copper: the silver ion undergoes spontaneous reduction, while the lead ion does not. This relative redox activity can be easily quantified in electrochemical cells by a property called cell potential. This property is commonly known as cell voltage in electrochemistry, and it is a measure of the energy which accompanies the charge...
43.5K