克服初始库伦比效率和离子储存硬碳阳极的速率性能之间的权衡
Zesheng Li1, Yufei Gao1, Wen Luo1
1Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China.
ACS nano
|February 25, 2026
概括
本研究介绍了一种可扩展的方法,用于制造离子电池的先进硬碳阳极,显著提高初始库伦比克效率和能量密度,以获得更好的性能.
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) 的关键阳极材料,由于其成本低和电压平原.
- 对于HC阳极来说,一个主要的挑战是平衡初始库伦比克效率 (ICE) 与速率能力.
研究的目的:
- 为高性能硬碳阳极开发可扩展的合成方法.
- 改进硬碳的结构特性,以增强的储存.
主要方法:
- 采用了千克级的融技术,并结合了六甲基氨酸 (HMTA) 交叉链接氧化策略.
- 合成的树脂衍生硬碳 (CPF-1400) 具有受控的结构特征,包括扩大层间间距和优化孔隙结构.
- 采用实验研究和现场表征来分析电化学性能和储存机制.
主要成果:
- 开发的CPF-1400表现出抑制的石墨化程度和扩大的碳层间距 (0.381 nm).
- 实现了低的特定表面积 (1.4 m2 g-1) 和丰富的闭孔 (0.315 cm3 g-1).
- 提供了高可逆容量 (431 mAh g-1),特殊的ICE (95%),并保持了良好的速率能力 (308 mAh g-1在1 A g-1).
- 完整的电池显示出高能量密度为293Wh kg-1.1.
结论:
- 这种新的合成策略有效地定制了硬碳结构,以获得优越的离子电池阳极性能.
- 该研究阐明了三阶段的储存机制以及固体电解质介相 (SEI) 的关键作用.
- 这项工作为下一代储能设备生产高性能硬碳阳极提供了可扩展的途径.
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