通过先氧化调节基于煤的硬碳阳极的闭孔结构,用于高速性能离子电池
Shengping Hou1,2,3, Da Zhang1,2,3, Yong Lei4
1Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province, Kunming University of Science and Technology, Kunming 650093, China.
Langmuir : the ACS journal of surfaces and colloids
|February 7, 2025
概括
预氧化增强了用于离子电池的煤炭衍生硬碳. 这种优化的阳极材料为储能应用提供了更好的储能,更快的充/放电率和更长的循环寿命.
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:
- 由于其丰富性和结构多样性,来自煤炭的硬碳 (CHC) 对储存具有前景.
- 热电池的挑战包括有限的层间距和有序的结构,阻碍充/放电率和离子电池 (SIB) 的循环寿命.
研究的目的:
- 使用氧化前策略优化CHC的多尺度结构.
- 提高用于SIBs的CHC阳极的储能和电化学性能.
主要方法:
- 采用预氧化策略来增加煤炭衍生材料中的氧含量.
- 描述结构变化,包括层间距和孔隙结构,预氧化煤制硬碳 (OCHC3).
- 评估OCHC3作为SIB中的阳极材料的电化学性能,包括速度能力和循环稳定性.
主要成果:
- 前氧化增加了氧含量到15.2%,促进了交联结构.
- 优化的OCHC3表现出更大的层间距 (0.394nm) 和更大的闭孔 (0.162cm3g-1),促进Na+的插入和扩散.
- OCHC3表现出卓越的速率性能 (201mAhg-1在高速率下) 和出色的循环稳定性 (96.2%的保留超过500个循环).
- 静电间歇定位显示了OCHC3.3中的"吸附-插入-填充"机制.
结论:
- 前氧化策略有效地优化了CHC结构,以增强储存.
- OCHC3为SIBs提供了一种高性能阳极材料,解决了传统CHCs的局限性.
- 这项工作为设计下一代能源存储系统的先进硬碳阳极提供了洞察力.
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