在离子液体电解质中的离子电池硬碳阳极的卓越兼容性
Giovanna Maresca1,2, Angelica Petrongari3, Sergio Brutti3
1Materials and Physicochemical Processes Technical Unit (SSPT-PROMAS- MATPRO) ENEA, Via Anguillarese 301, 00123, Rome, Italy.
ChemSusChem
|July 26, 2023
概括
来自生物废物的硬碳显示出作为离子电池阳极的出色性能. 离子液体电解质可实现超过1500个循环,具有高容量保留和高效率.
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:
- 离子电池 (SIB) 是离子电池的一个有希望的替代品.
- 开发高性能阳极材料对于SIB的发展至关重要.
- 从生物废物中提取的硬碳 (HCs) 提供了一个可持续且潜在的成本效益高的阳极解决方案.
研究的目的:
- 研究天然生物废物中硬碳的电化学性能,作为离子电池中的阳极.
- 评估离子液体电解质在增强SIB阳极稳定性和可循环性的有效性.
- 分析HC阳极上的化机制和固体电化学接口 (SEI) 形成.
主要方法:
- 以不同的扫描速率进行循环电压测量,以研究Na+间隙.
- 电化学阻抗光谱测量,以确定体积和界面电阻.
- 在室温下发生静电充/放电循环.
- 兰德尔斯-塞夫奇克方程对Na+扩散系数的评估.
- 拉曼光谱分析SEI层的演变.
主要成果:
- 硬碳阳极在离子液体电解质中表现出高度可逆和可重现的化过程.
- 在[N1114][FSI]电解液中,在1500个循环后,容量保留超过98%的效果.
- 在延长循环时,库伦比效率保持在99%以上.
- 与传统电解质相比,离子液促进了上层SEI层的形成.
结论:
- 来自生物废物的硬碳是高性能离子电池的可行阳极材料.
- 离子液体电解质,特别是[N1114][FSI],显著提高了阳极的循环性和稳定性.
- 性能的提高归因于由离子液体促进的强大的SEI层的形成.
相关概念视频
Ionic Bonds
118.6K
Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
118.6K
Solubility of Ionic Compounds
63.4K
Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
63.4K
Electrolysis
26.7K
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...
26.7K
Ionic Bonding and Electron Transfer
41.7K
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.
41.7K
Ion Exchange
622
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...
622
Reduction of Alkynes to trans-Alkenes: Sodium in Liquid Ammonia
9.3K
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,...
9.3K


