氨基-合物凝结衍生N-多硬碳微球用于高容量和坚固的储存
Ran Chen1, Xinyuan Li1, Congcong Cai1
1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, P. R. China.
用气合的硬碳微球为离子电池提供了增强的性能. 这些材料实现了高容量,优异的初始库伦比克效率和长期耐用性,解决了电池阳极开发的关键挑战.
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:
- 硬碳是离子电池的首选阳极材料.
- 在硬碳中同时实现高容量,初始库伦比效率 (ICE) 和耐久性仍然是一个重大挑战.
- 开发先进的阳极材料对于提高离子电池性能至关重要.
研究的目的:
- 为离子电池阳极合成添加硬碳微球 (NHCMs).
- 调查兴奋剂对硬碳结构和电化学特性的影响.
- 为了阐明NHCMs中的储存机制.
主要方法:
- 使用m-phenylenediamine和甲作为前体的氨基合反应.
- 在不同温度下合成化硬碳微球 (NHCMs).
- 电化学表征包括静电循环,速率能力测试和现场分析.
- 理论计算 (例如,密度函数理论) 来理解兴奋剂效应.
主要成果:
- 优化的NHCM-1400表现出高含量 (4.64%).
- NHCM-1400 显示了 87% 的高 ICE 和 399 mAh g-1 的可逆容量在 30 mA g-1.1 时.
- 观察到优异的耐用性,在120个周期内保持98.5%的容量,同时在2000 mA g-1.1时保持297 mAh g-1的速率能力.
- 在现场表征揭示了一个吸附-间隔-填充储存机制.
- 理论计算表明,N-doping可以降低Na+吸附能量.
结论:
- 兴奋剂有效地提高了硬碳微球的储存性能.
- NHCMs为高性能离子电池提供了一个有前途的阳极材料.
- 开发的材料解决了提高离子电池阳极容量,ICE和耐久性的关键需求.
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