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稳定微粒子阳极的散体相和固体电解质间相,通过构建梯度层次顺序的导电网络.

Liang Ma1,2, Youyou Fang1,2, Ni Yang2

  • 1School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China.

Advanced materials (Deerfield Beach, Fla.)
|April 24, 2024
PubMed
概括

一个新的梯度层次顺序导电 (GHOC) 网络稳定了微粒 (μSi) 阳极,显著提高了高能离子电池的循环性能.

关键词:
采用 LiF 丰富的六合.大量相位和相间结构.梯度 - 层次上排序的导电网络.时间-cnff时间3c2txx

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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:

  • 微粒 (μSi) 为离子电池提供了高的理论容量,但其稳定性不佳.
  • 内部应力和不稳定的固体电解质间相 (SEI) 形成阻碍了μSi阳极的实际应用.
  • 开发强大的结构对于提高阳极的电化学性能至关重要.

研究的目的:

  • 为稳定μSi阳极设计一个梯度层次顺序导电 (GHOC) 网络结构.
  • 为了提高μSi阳极的散相和相间稳定性.
  • 提高高能量密度离子电池的循环性能和商业可行性.

主要方法:

  • 使用2D过渡金属碳化物 (Ti3C2Tx) 和1D氧化纤维素纳米纤维 (TCNF) 与聚烯酸 (PAA) 制造GHOC网络.
  • 描述GHOC网络内的结构完整性和导电通道.
  • 在离子电池配置中的μSi-MTCNF-PAA阳极的电化学测试.

主要成果:

  • GHOC网络有效地稳定了μSi阳极的散体相和SEI.
  • Ti3C2Tx为F丰富的SEI层做出了贡献,增强了稳定性.
  • 微Si-MTCNF-PAA阳极在1.0°C下进行500个循环后,达到1413.7mAhg-1的高放电容量.
  • 一个完整的细胞在50个循环后显示92.0%的容量保留.

结论:

  • 拟议的GHOC网络结构为稳定具有高体积应变的阳极材料提供了有效的策略.
  • 这种方法显著提高了基于的离子电池的循环稳定性和能量密度.
  • 这些发现为下一代储能解决方案中的先进阳极材料铺平了道路.