通过弱溶解乙烯电解质抑制石墨的协同干扰,以实现离子电池中稳定的循环
Jianing Wang1,2, Xueying Liang2, Zhifei Mao1
1Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, China.
The journal of physical chemistry letters
|September 9, 2025
概括
溶解能力较弱的以太溶剂,如四基 (THF),可以防止离子电池中的阴离子溶剂与离子电池的协同插曲. 这提高了石墨阳极的稳定性和容量,提高了电池性能.
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:
- 基于以太的电解质对于阳极中稳定的固体电解质接口 (SEI) 是至关重要的.
- 传统的以太会在石墨中引起阴离子溶剂的共同插曲,从而降低容量并增加电压.
- 这种现象限制了离子电池中石墨阳极的性能.
研究的目的:
- 开发弱溶解的以太溶剂,以抑制阴离子-溶剂协同干扰.
- 研究四基 (THF) 作为离子电池电解质的弱溶解溶剂.
- 为了提高离子电池中石墨阳极的稳定性和容量.
主要方法:
- 理论计算以确定K+-溶剂的结合能.
- 用THF基电解质对离子电池进行电化学测试.
- 分析SEI形成和阳极稳定性的分析.
主要成果:
- 与DME (-1.37 eV) 和EC (-1.26 eV) 相比,四氨酸 (THF) 的K+溶剂结合能明显较低 (-0.89 eV).
- 在THF中的1MK盐溶液抑制了协同插曲,电解质分解和石墨剥落.
- 基于THF的电解质促进了统一的SEI,在200个循环中实现了石墨阳极99%的容量保留.
- 电解质表现出适应硬和软碳酸极的适应性.
结论:
- 弱溶解的以太电解质有效地抑制了石墨阳极中的阴离子-溶剂协同插曲.
- 基于THF的电解质为离子电池中的高容量和稳定的石墨阳极提供了有前途的解决方案.
- 这项研究通过优化电解质设计,推进了石墨阳极在离子电池中的应用.
相关概念视频
03:13Intermolecular Forces
70.0K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
70.0K
01:17Ion Exchange
1.1K
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...
1.1K
02:12Solvating Effects
8.5K
An understanding of the solvating effect helps rationalize the relation between solvation and acidity of the compound. In addition, this also explains the relative stability of conjugate bases for compounds with different pKa values. This lesson details, in-depth, the principle of solvating effects. The strength of an acid and the stability of its corresponding conjugate base are determined using pKa values. This observed relationship is a consequence of solvation, which is the interaction...
8.5K
02:36Crown Ethers
6.0K
Crown ethers are cyclic polyethers that contain multiple oxygen atoms, usually arranged in a regular pattern. The first crown ether was synthesized by Charles Pederson while working at DuPont in 1967. For this work, Pedersen was co-awarded the 1987 Nobel Prize in Chemistry. Crown ethers are named using the formula x-crown-y, where x is the total number of atoms in the ring and y is the number of ether oxygen atoms. The term 'crown' refers to the crown-like shape that these ether molecules...
6.0K
01:19Ionic Strength: Effects on Chemical Equilibria
2.5K
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...
2.5K
03:00Electrolysis
30.2K
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...
30.2K