纳米封闭的Si@C复合材料具有卓越的离子存储性能,其来源于基于POSS的共价框架和低温降解方法
Yu Zhang1, Yanan Xu1, Shupeng Zhao1
1State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China. hbdu@nju.edu.cn.
Dalton transactions (Cambridge, England : 2003)
|January 13, 2025
概括
研究人员使用自下而上的方法开发了新的碳 (Si@C) 阳极材料. 这些先进的材料表现出极好的离子电池性能,在1000个周期内保持高容量.
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:
- 阳极具有较高的理论容量,但由于化过程中的体积膨胀,其循环稳定性较差.
- 缓解这些问题的策略包括减少粒子大小和与导电碳矩阵集成.
- 多面体寡合性丝二氧化 (POSS) 是先进的阳极材料的潜在构建模块.
研究的目的:
- 使用自下而上的策略合成新的Si@C阳极材料.
- 为了提高离子储存性能和基于的阳极的循环稳定性.
- 探索八氨基多面寡合物丝素 (NH2-POSS) 在能量存储中的应用.
主要方法:
- 一个自下而上的合成策略,涉及 NH2-POSS 与铁甲的交叉链接.
- 高温处理和低温液体还原以形成Si@C纳米球.
- 合成的Si@C材料作为离子电池中阳极的电化学测试.
主要成果:
- 成功合成了带有超薄条纹的Si@C纳米圈,嵌入在连续碳框架中.
- 取得了优异的离子存储性能,在0.5Ag-1.0的1000个循环后保留了1363mAhg-1.
- 经过激活后的第一周期容量的182%的容量保留,显著超过石墨.
结论:
- 开发的Si@C纳米球有效地解决了阳极的体积膨胀和导电性问题.
- 这种方法为设计高性能离子电池的先进基阳极材料提供了一个有前途的途径.
- 突出了POSS衍生品在储能材料领域的潜力.
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