多效应预氧化策略将煤转化为硬碳,以提高储存性能
Guokan Liu1, Jialiang Yuan1, Haoyu Li1
1School of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China.
一种新的先氧化方法增强了用于离子电池的基于煤炭的硬碳. 这一策略提高了结构稳定性,并创造了活跃站点,提高了储存性能和循环寿命.
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:
- 煤的先氧化对于在碳化过程中抑制石墨化至关重要.
- 传统的预氧化方法提供了有限的表面活性位,阻碍了储存能力.
- 从煤炭中开发先进的硬碳阳极对于高效的离子电池至关重要.
研究的目的:
- 为基于煤炭的硬碳提出一个多效应的先氧化策略.
- 为了抑制结构重组,并创造丰富的表面活性场所.
- 为了提高基于煤炭的硬碳阳极的储能性能.
主要方法:
- 使用的Mg(NO3) 2·6H2O用于在450°C时预氧化煤.
- 使用Mg ((NO3) 2·6H2O作为一个交叉链接剂来抑制碳层的重新排列.
- 利用MgO残留物通过与碳的反应产生表面活性位点.
主要成果:
- 优化的基于煤炭的硬碳表现出增强的伪写字域和储存的活性位点.
- 在 20 mA g-1.1 时实现了 287.1 mAh g-1 的出色容量.
- 经过200个循环后96.1%的容量保留和1000个循环后88.9%的显著循环稳定性.
结论:
- 多效应预氧化策略有效地抑制了结构重组,并创建了活性位点.
- 开发的基于煤炭的硬碳阳极显示出离子电池的卓越性能.
- 这项工作提出了一种实际方法,用于将低成本的煤炭转化为高性能阳极材料.
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