在多个开放/关闭孔比的新型β-环氧衍生硬碳阳极材料的离子扩散行为
Shuangshuang Ao1, Xuewen Yu2, Xiaojie Wang1
1Advanced Energy Storage Technology and Equipment Research Institute, Ningbo University, Ningbo, Zhejiang 315211, China.
Nano letters
|January 15, 2025
概括
研究人员开发了一种新的方法,从β-cyclodextrin中制造球形硬碳,改善离子扩散和电池的高速性能. 这提高了离子电池的平原动力学和闭孔利用率.
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:
- 实现高平原主导的硬碳高速性能是很困难的.
- 孔隙结构在硬碳中离子扩散中的精确作用尚未完全理解.
研究的目的:
- 为球形硬碳开发一种简单的液相分子重建策略.
- 为了研究毛孔结构影响离子扩散的机制.
- 为了提高高原动力学和离子电池性能.
主要方法:
- 液相分子重建β-环氧.
- 用有序毛孔通道制备球形硬碳.
- 材料性能和电化学性能的详细表征.
主要成果:
- 该方法创造了球形硬碳,连续,有序的孔径通道.
- 在分散区域中优化Na+积累,改善高原动力学.
- 增加了特定表面积至129 m2 g-1 (与原始的2.91 m2 g-1相比).
- 在30°C (7.5 A g−1) 保持高原地区,达到179 mAh g−1容量.
结论:
- 来自β-环氧素的硬碳表现出增强的高速性能.
- 这项研究提供了对离子扩散孔隙结构优化的见解.
- 这项工作促进了离子电池在低压区域内硬碳的动力学.
相关概念视频
Ion Exchange
537
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...
537
Dialysis
582
Dialysis is a diffusion-based purification process that separates analyte molecules from a complex matrix. This is accomplished by allowing molecules in the solution to pass through a semipermeable membrane into a liquid on the other side. The membrane is usually made of cellulose acetate or cellulose nitrate, and the second liquid must be miscible with the solution. Ions (e.g., chloride or sodium) or organic molecules (e.g., glucose) can pass through the membrane pores, which generally have...
582


