通过SN2反应将有孔的碳调整为硬碳,以增强储存
Yan Zhang1, Biao Zheng1, Qingfeng Fu1,2
1College of Materials Science and Engineering, Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy, Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology, Hunan University, Changsha 410082, China.
研究人员通过回收废物聚四乙烯 (PTFE) 来将多孔碳 (PC) 转化为高性能硬碳 (HC) 阳极,用于离子电池 (SIB). 这一过程提高了的储存能力和稳定性.
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
- 可持续化学 可持续化学
背景情况:
- 多孔碳 (PC) 为储能提供了很大的表面积,但由于过度的开放多孔性,它在离子电池 (SIB) 中表现不佳.
- 这种开放的孔隙性会导致有害的副作用和SIB阳极的初始库伦比克效率低.
研究的目的:
- 通过转化多孔碳来开发SIB的高性能硬碳 (HC) 阳极.
- 通过通过受控的微结构转化过程将废弃的聚四乙烯 (PTFE) 进行上循环,实现这种转化.
主要方法:
- 利用氨 (NH3) 在PTFE中分裂超强的C-F键,促进*in situ*的碳沉积.
- 从多孔的碳前体中设计了一个闭孔结构,带有曲的石墨字体域.
- 优化了由此产生的硬碳材料 (YPT-1200) 用于离子电池阳极应用.
主要成果:
- 优化后的YPT-1200电极表现出高可逆容量,为370.3 mAh g-1.1.
- 取得了令人满意的初始库伦比克效率78.0%.
- 显示了令人印象深刻的循环稳定性,在0.5C的300个循环中保持了83.4%的容量.
结论:
- 使用PTFE废料直接微结构性将PC转化为HC是一种高性能SIB阳极的可行策略.
- 开发的HC材料显示出改善储能和循环寿命的巨大潜力.
- 这种上循环方法为生产先进电池材料提供了一个可持续的途径.
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