一种低度的电解质添加剂,用于在用于水性电池的 Zn 金属阳极上构建固体电解质间相
Guoli Zhang1, Jiaqi Zhu1, Kuo Wang1
1Department of Chemistry, Northeastern University, Shenyang 110819, China. sunxiaoqi@mail.neu.edu.cn.
概括
二氧化 (DX) 添加剂通过防止不均沉积和腐蚀,稳定水性电池中的阳极. 这大大延长了电池的寿命,提高了效率.
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
- 电池技术 电池技术
背景情况:
- 水性电池中的金属阳极遭受不均的沉积和腐蚀.
- 这些问题限制了电池的循环寿命和效率.
研究的目的:
- 使用二氧化碳 (DX) 作为电解质添加剂来稳定阳极.
- 为了提高水性电池的性能.
主要方法:
- 引入了低度的二氧化 (DX) 作为电解质添加剂.
- 研究了DX在Zn电极表面的吸附和协调行为.
- 分析了DX对Zn2+物种和固体电解质介相 (SEI) 形成的影响.
- 测试Zn对称细胞和Zn//Cu细胞用于性能评估.
主要成果:
- 二氧化 (DX) 对Zn和Zn2+具有强烈的亲和力,吸附到Zn电极上并与Zn2+协调.
- 在Zn2+-DX物种中,最低的未被占用的分子轨道能量水平下降.
- DX抑制了副作用,形成了一个稳定的SEI层,确保了均的Zn沉积.
- Zn对称细胞的周期寿命从99小时延长到2100小时.
- 在 Zn//Cu 细胞中,库伦比效率达到 99.5%.
结论:
- 二氧化 (DX) 有效地稳定水性电池中的阳极.
- DX添加剂通过促进均的 Zn 沉积和抑制腐蚀来提高电池性能.
- 开发的方法为改善水性电池技术提供了一个有希望的策略.
相关概念视频
Standard Electrode Potentials
43.9K
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...
43.9K
Formation of Complex Ions
23.6K
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...
23.6K
Electrolyte and Nonelectrolyte Solutions
63.1K
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.
63.1K
Electrodeposition
634
Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Electrodeposition can...
634
Ionic Strength: Effects on Chemical Equilibria
1.5K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
In this solution, the primary...
1.5K
Electrolysis
26.4K
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...
26.4K


