通过改造来定制伪石墨领域,以提高硬碳的储存能力和耐用性
Yaqin Zhou1, Yuanlang Wang1, Chunyan Fu1
1Department of Materials Physics and Chemistry, School of Materials Science & Engineering, Central South University, Changsha, Hunan, 410083, China.
Small (Weinheim an der Bergstrasse, Germany)
|September 16, 2024
概括
碳化对硬碳球的修改增强了离子电池阳极. 这提高了储存能力,速率能力和循环稳定性,以实现商业可行性.
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:
- 硬碳 (HC) 是离子电池 (SIB) 的一个有前途的阳极.
- 关键的挑战包括低的首次库伦比克效率 (ICE),低速率能力和有限的循环稳定性.
- 这些问题源于Na+转移动力学,表面化学和伪石墨碳含量.
研究的目的:
- 为了提高SIB硬碳阳极的性能.
- 解决Na+转移动力学,表面化学和伪石墨碳含量的局限性.
- 为SIBs开发一种商业上可行的阳极材料.
主要方法:
- 用改性硬碳固体球体 (Mo2C/HC-5.0) 的合成.
- 对离子转移动力学,表面化学和碳结构的全面分析.
- 电化学测试包括容量,速率能力和循环稳定性.
主要成果:
- Mo2C/HC-5.0具有更高的伪石墨碳含量,更好的活性点和更稳定的结构.
- 观察到增强的Na+转移动力学和表面化学.
- 实现了高容量 (410.7 mAh g-1 在50 mA g-1 时),高ICE (83.9%),优异的速率能力 (202.8 mAh g-1 在2 A g-1 时) 和稳定的循环 (214.9 mAh g-1 在800个循环后在1 A g-1).
结论:
- 碳化的修改显著提高了SIBs的硬碳阳极性能.
- 改进的材料特性导致优越的储能,速度性能和耐用性.
- Mo2C/HC-5.0为商业化SIB技术提供了一个可行的解决方案.
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