揭示结晶性对-电池中的电化学减少的影响
Leo W Gordon1, Rahul Jay1, Ankur L Jadhav1
1Department of Chemical Engineering, The City College of New York, CUNY, 160 Convent Ave., New York, New York 10031, United States.
ACS materials letters
|July 5, 2024
概括
无形使可充电的-电池成为可能,而晶体需要电化学氧化来促进放电. 这项研究澄清了的含量.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- (Se) 是 (Al) 电池的有前途的阴极材料,具有较高的理论容量 (2037 mA h g−1) 和优于硫的导电性.
- 可充电的Al-Se电池可以利用Se(-II) 和Se(IV) 之间的六电子还氧反应,但电化学反应途径和Se的降解条件尚不清楚.
- 现有的文献显示,了解电池中的电化学行为存在矛盾.
研究的目的:
- 阐明在可充电电池中将电化学降解为化 (Al2Se3) 所需的条件.
- 研究晶体结构对其电化学性能的影响.
- 为了澄清电池中的电化学反应机制.
主要方法:
- 电化学测试无形和晶体作为电池中的阴极材料.
- 在更高的潜力下,晶体的电化学氧化.
- 固态77Se核磁共振 (NMR) 光谱分析结构变化.
主要成果:
- 将电化学还原为Al2Se3是可以使用无形的,但用晶体可以抑制的.
- 在更高的电位下,晶体的电化学氧化到SeCl4使其随后通过减少远程顺序将其释放到Al2Se3成为可能.
- 固态77SeNMR证实,即使在电化学循环过程中失去了结晶性后,局部螺旋结构也被保留.
结论:
- 的结构状态 (无形与晶体) 极大地影响其在电池中的电化学降解.
- 一个涉及电化学氧化后还原的两步过程可以使结晶的使用.
- 的局部螺旋结构完整性在电化学反应中保持不变,这表明其可能具有稳定的循环.
更多相关视频
10:03Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
25.4K
12:02Determination of Thermodynamic Properties of Alkaline Earth-liquid Metal Alloys Using the Electromotive Force Technique
Published on: November 3, 2017
13.1K
相关概念视频
01:19Acid Halides to Alcohols: LiAlH4 Reduction
2.7K
Acid halides are reduced to alcohols in the presence of a strong reducing agent like lithium aluminum hydride.
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
2.7K
03:12Batteries and Fuel Cells
27.3K
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...
27.3K
02:10Reduction of Alkynes to trans-Alkenes: Sodium in Liquid Ammonia
9.2K
Alkynes can be reduced to trans-alkenes using sodium or lithium in liquid ammonia. The reaction, known as dissolving metal reduction, proceeds with an anti addition of hydrogen across the carbon–carbon triple bond to form the trans product. Since ammonia exists as a gas (bp = −33°C) at room temperature, the reaction is carried out at low temperatures using a mixture of dry ice (sublimes at −78°C) and acetone.
When dissolved in liquid ammonia, an alkali metal,...
When dissolved in liquid ammonia, an alkali metal,...
9.2K
02:54Trends in Lattice Energy: Ion Size and Charge
23.8K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
23.8K