在高性能离子电池的煤炭衍生硬碳阳极中,氧气驱动的分子重构
Lu Zhang1, Hengyi Fang1,2,3, Liang Gao4
1Energy Research Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|January 12, 2026
概括
这项研究使用氧驱动策略增强用于离子电池的硬碳阳极. 该方法提高了特定容量和初始库伦比克效率,以提高电池性能.
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.
- 目前的高温材料面临的挑战是特定容量低和初始库伦比效率 (ICE) 低.
研究的目的:
- 开发一种有效的策略,以改善可逆离子 (Na+) 在HC中的储存.
- 通过微观结构修改,提高SIB的HC阳极的性能.
主要方法:
- 采用了一种由氧驱动的分子重构策略,涉及协同活性和前氧化.
- 氧功能组被用来促进煤炭前体中的sp2-碳重建,改变HC微观结构.
主要成果:
- 修改后的HC表现出扩大了层间间距,增加了伪图形域和闭孔结构.
- 在25 mA g-1下实现了317.4 mAh g-1的高可逆容量.
- 展示了令人印象深刻的88.05%的ICE和出色的速率能力 (253.42mAhg-1在1000mAg-1).
- 在1000个循环中展示了82.92%的优越容量保留.
结论:
- 氧气驱动的微结构重建对于HC中持久的储存至关重要.
- 拟议的策略有效地提高了Na+运输动力学,并抑制了电解质分解.
- 这种方法为SIBs开发高性能HC阳极提供了有希望的途径.
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