双功能碳电极添加剂 降低水性电解质的盐依赖性
Binghang Liu1,2, Jintao Ma1,2, Jingnan Feng1,2
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Science, Beijing, 100190, China.
Advanced materials (Deerfield Beach, Fla.)
|October 26, 2024
概括
一种新的双功能碳电极添加剂 (BFEA) 通过形成稳定的固体电解质介相 (SEI) 和现场石墨,提高水性电池的寿命. 这一创新提高了大规模能源储存的效率和循环寿命.
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:
- 固体电解质间相 (SEI) 对于水性电池的寿命至关重要.
- 传统的SEI形成依赖于高度盐,导致效率低下和降解.
- 离子衍生的SEI形成面临低效率和长期材料消耗的挑战.
研究的目的:
- 开发一种双功能碳电极添加剂 (BFEA),用于改善水性电解质中的SEI形成.
- 为了使富含LiF的SEI形成和现场石墨生产能够进行电化学预减.
- 为了减少对高度盐的依赖,并抑制寄生的进化.
主要方法:
- 电化学预减少BFEA以形成富含LiF的SEI.
- 在阳极内在现场生成导电石墨.
- 使用低度LiTFSI和无机LiCl电解质.
- 使用Ah级袋式电池进行性能评估.
主要成果:
- 在低度的10米LiTFSI电解质中实现了高SEI形成效率.
- 抑制的寄生进化从11.24到4.35nmol分钟-1.1.
- 通过in situ石墨减少电池偏振和增强充电转移动力学.
- 证明了改善的循环稳定性 (>300个循环),容量保持率为78.2%.
- 观察到最小的往返效率衰减 (△RTE = 2%).
结论:
- BFEA有效地形成富含LiF的SEI和现场石墨,提高水性电池的性能.
- 该添加剂降低了盐的依赖性,使无机LiCl的使用成为可能,并提高了SEI形成的效率.
- 经过BFEA修改的电池表现出卓越的循环稳定性,容量保留和往返效率,适合大规模储能.
相关概念视频
Ionic Strength: Effects on Chemical Equilibria
1.4K
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...
1.4K
Potentiometry: Membrane Electrodes
470
Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
470
Electrolyte and Nonelectrolyte Solutions
62.3K
Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.
62.3K
Potentiometry: Types of Electrodes
535
Reference electrodes serve as a stable reference point for potentiometric measurements, while indicator and working electrodes react to variations in the composition of a solution.
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...
The Standard Hydrogen Electrode (SHE) is a widely used reference electrode that maintains zero potential across all temperatures. However, its need for a continuous hydrogen gas supply renders it impractical for everyday use.
An alternative to SHE is the Saturated Calomel Electrode (SCE). This electrode features an...
535
Factors Affecting Solubility
33.2K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
33.2K
Electrolytes: van't Hoff Factor
32.9K
Colligative Properties of Electrolytes
The colligative properties of a solution depend only on the number, not on the identity, of solute species dissolved. The concentration terms in the equations for various colligative properties (freezing point depression, boiling point elevation, osmotic pressure) pertain to all solute species present in the solution. Nonelectrolytes dissolve physically without dissociation or any other accompanying process. Each molecule that dissolves yields one...
The colligative properties of a solution depend only on the number, not on the identity, of solute species dissolved. The concentration terms in the equations for various colligative properties (freezing point depression, boiling point elevation, osmotic pressure) pertain to all solute species present in the solution. Nonelectrolytes dissolve physically without dissociation or any other accompanying process. Each molecule that dissolves yields one...
32.9K


