在SnS2阳极中以溶剂驱动的Na存储:用于可逆反应,固体电解质间相和形态转换的原子模拟导向策略
Young-Hoon Kim1, Joo-Yeon Moon1, Yeong-In Yoon1
1Department of Materials Science and Engineering, Korea University, Seoul 02841, South Korea.
ACS nano
|December 18, 2024
概括
研究人员使用特定溶剂优化了离子电池阳极,以提高性能. 这一策略增强了化-转化-合金反应,并减少了固体电解质相间形成,以更好地储存能量.
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
- 计算化学计算化学
背景情况:
- 锡二硫化物 (SnS2) 显示出离子电池的潜力,这是由于其分层结构和间转换合金 (ICA) 反应.
- 实际应用受到次优反应路径和固体电解质介相 (SEI) 形成的限制.
研究的目的:
- 调查电解质溶剂在调整离子电池SnS2阳极性能方面的作用.
- 通过战略性溶剂选择,增强可逆ICA反应并最大限度地减少SEI的形成.
主要方法:
- 基于机器学习的热力学,用于预测反应热力学.
- 人工神经网络辅助的分子动力学,用于模拟离子运输和接口行为.
- 密度函数理论 (DFT) 用于详细的电子结构计算.
主要成果:
- 确定了特定的溶剂,以有效指导SnS2相变和反应途径.
- 溶剂选择显著减少了有害的固体电解质间相 (SEI) 形成.
- 将微型SnS2转化为3D多孔纳米结构,使用最小的SEI.
- 在Na-SnS2半电池中,在0.5°C下达到1100mAhg-1 (97%的理论) 的高可逆容量.
结论:
- 电解质溶剂的选择对于实现可逆ICA反应和SnS2阳极的形态控制至关重要.
- 这种方法克服了SEI形成的局限性,为离子电池阳极性能设定了新的基准.
- 强调溶剂工程在先进的储能系统中的重要性.
相关概念视频
SN2 Reaction: Stereochemistry
9.2K
In an SN2 reaction, the nucleophilic attack on the substrate and departure of the leaving group occurs simultaneously through a transition state. As the nucleophile approaches the substrate from the back-side, the configuration of the substrate carbon changes from tetrahedral to trigonal bipyramidal and then back to tetrahedral, leading to an inversion in the configuration of the product.
If the substrate is an achiral molecule at the α-carbon, the inversion of configuration is not...
If the substrate is an achiral molecule at the α-carbon, the inversion of configuration is not...
9.2K
Ion Exchange
546
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
546
Reduction of Alkynes to trans-Alkenes: Sodium in Liquid Ammonia
9.1K
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,...
9.1K
Preparation and Reactions of Sulfides
4.7K
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
4.7K
Electrolysis
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
Preparation and Reactions of Thiols
5.9K
Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
5.9K


