对于具有高能量密度的离子电容器的基于溶液的深度预化.
Seungyun Jeon1,2, Sehee Lm1, Inyeong Kang1
1Energy Materials Research Center, Korea Institute of Science and Technology (KIST), Seoul, 02792, South Korea.
Small (Weinheim an der Bergstrasse, Germany)
|February 27, 2024
概括
一种新的预化策略通过提高无形碳阳极初始库伦比效率 (ICE) 来显著提高离子电容 (LIC) 的能量密度. 这种方法使活性碳容量增加了一倍,使高性能,紧的储能解决方案成为可能.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 离子电容器 (LIC) 提供高功率密度和循环性,超过了离子电池.
- 在无形碳阳极 (硬碳,软碳) 中,初始低库伦效率 (ICE) 限制了LIC能量密度.
- 由于阳极不良,阴极容量的不足利用是ICE的一个关键挑战.
研究的目的:
- 为LIC中的无形碳阳极开发基于溶液的深度预化策略.
- 为了提高碳阳极的初始库伦比克效率 (ICE).
- 通过改进电极平衡,在LIC中实现高能量密度.
主要方法:
- 应用基于溶液的深度预化技术,使用接触离子对主导溶液.
- 基于增加阴极容量的系统电极平衡.
- 在活性炭 (AC) 阳极中激活Li+阴离子储存.
主要成果:
- 实现了150%的阳极ICE (超过100%),使交流容量翻了一番.
- 释放的摇椅LIC操作和双离子存储机制.
- 达到106.6Wh kg-1 (AC+SC) 的能量密度,与非预化LIC相比增加了281%.
- 通过降低阴极-阳极质量比而不会损失容量,将细胞厚度降低了67%.
结论:
- 基于溶液的深度化学预化有效地提高了碳阳极ICE和LIC的能量密度.
- 该战略使高能耗LIC能够使用无过渡金属,地球上丰富的材料.
- 这种方法解决了电力密集型应用的实际需求.
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