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在二次电池中合成封装的球形空心碳用于阳极材料
Kyu T Lee1, Yoon S Jung, Seung M Oh
1School of Chemical Engineering and Research Center for Energy Conversion & Storage, Seoul National University, Seoul, 151-744, Korea.
Journal of the American Chemical Society
|May 8, 2003
概括
研究人员为离子电池开发了新的封装的空心碳球体. 这种结构通过防止锡聚合和适应体积膨胀来提高循环性能.
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
- 纳米技术 纳米技术
背景情况:
- 锡 (Sn) 是离子电池的一个有前途的阳极材料,因为它具有很高的理论容量.
- 然而,Sn阳极在循环过程中遭受大量体积膨胀,导致循环稳定性差.
- 开发具有改善结构完整性的纳米结构Sn材料至关重要.
研究的目的:
- 为了合成和描述新的纳米尺寸Sn封装的球形空心碳材料.
- 研究这些材料在二次电池中作为阳极的潜力.
- 了解空心碳外在提高电池性能方面的作用.
主要方法:
- 在 cetyltrimethylammonium bromide (CTAB) 微粒中制备带有 tributylphenyltin (TBPT) 封装的复合素 (R) - 甲 (F) 盐.
- 核心外的聚合和碳化,形成Sn封装的空心碳球.
- 通过调整R/CTAB和TBPT/CTAB分子比例来控制颗粒大小.
- 作为Li二次电池中的阳极材料的电化学测试.
主要成果:
- 成功合成了纳米尺寸的 Sn 封装的球形空心碳.
- 对空心碳和内部Sn粒子的大小进行了控制.
- 当作为电池阳极使用时,与纯金属Sn相比,观察到更好的循环性能.
- 空洞的碳外有效地防止了Sn粒子的聚合,并适应了体积变化.
结论:
- 核心外结构的Sn封装空心碳是二次电池的可行阳极材料.
- 空心碳结构提供了机械支,并防止了Sn纳米颗粒的聚合.
- 这种设计可以提高离子电池的电化学稳定性和循环性能.
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