相关实验视频
Updated: Jul 12, 2025
06:58
Zinc-Sponge Battery Electrodes that Suppress Dendrites
Published on: September 29, 2020
4.4K
微量Sc3+-电解质添加剂,使水性离子电池的稳定Zn金属阳极成为可能
Chun Chen1,2,3, Liansheng Li2,3, Zuxin Long2,3
1School of Rare Earth, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China.
Chemical communications (Cambridge, England)
|October 24, 2023
概括
添加微量扫 (Sc3+) 显著提高了阳极在水性电解质中的性能. 这种增强提高了可充电电池的Coulombic效率和稳定性.
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:
- 金属阳极由于其高理论容量和低成本,对可充电电池来说是有希望的.
- 水性电解质面临着诸如树突形成和循环稳定性差等挑战,限制了实际应用.
- 改善的涂层/剥离行为对于开发高性能电池至关重要.
研究的目的:
- 为了研究微量 (Sc3+) 作为添加剂对金属阳极电化学性能的影响.
- 了解Sc3+影响沉积和剥离动力学的机制.
- 在对称的Zn‖Zn细胞和完整的Zn‖V2O5细胞中评估性能提升.
主要方法:
- 电化学表征包括循环电压测量和静电循环.
- 核化超电位和电化学动力学的分析.
- 用V2O5阴极在水性 ZnSO4电解质中测试对称的 Zn‖Zn 细胞和全细胞.
主要成果:
- 1.0 mol% Sc3+ 添加剂显著提高了 Zn 阳极的库伦比效率和循环稳定性.
- 添加Sc3+降低了涂层的核化过量潜力.
- 在Sc3+修饰的电解质中观察到Zn/脱落的增强动力学.
- 无论是Zn‖Zn还是Zn‖V2O5细胞都表现出更好的循环稳定性和速度能力.
结论:
- 微量Sc3+是一种有效的添加剂,可提高水性金属阳极的性能.
- 性能提升归因于减少核聚变过强和加速动力学.
- Sc3+修改为开发稳定和高速率基电池提供了一个有前途的战略.
相关概念视频
02:58Properties of Transition Metals
26.0K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
26.0K
03:02Standard Electrode Potentials
44.1K
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...
44.1K
03:46Qualitative Analysis
22.4K
For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
For instance, group IV...
22.4K
00:56Extraction: Advanced Methods
463
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
463
03:45Formation of Complex Ions
23.7K
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...
23.7K
01:26EDTA: Auxiliary Complexing Reagents
598
EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
598