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相关概念视频

Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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相关实验视频

Updated: Jun 12, 2025

Preparation of Graphene Liquid Cells for the Observation of Lithium-ion Battery Material
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一种新的结构化Si基复合材料与2D结构化石墨,用于高性能离子电池.

Min Ji Kim1, Inuk Lee1,2, Jin Woong Lee1,2

  • 1Energy and Environmental Division, Korea Institute of Ceramic Engineering and Technology, Jinju, Gyeongnam, 52851, Republic of Korea.

Small (Weinheim an der Bergstrasse, Germany)
|September 23, 2024
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概括

一种新的石墨@@碳复合材料阳极材料解决了.

关键词:
2D结构石墨二维结构石墨.基于Si的阳极复合材料.离子电池是一种离子电池.机械融合过程中的机械融合过程.

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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
  • 储能 储能 储能 储能 储能 储能

背景情况:

  • 阳极为离子电池 (LIB) 提供了高的理论容量.
  • 阳极的主要挑战包括显著的体积膨胀和低电子导电性.
  • 复合材料正在探索,以减轻的内在缺点.

研究的目的:

  • 为了合成和表征一个微型球形石墨@@碳 (Gr@Si@C) 阳极复合材料.
  • 为了评估Gr@Si@C复合物的电化学性能,作为LIBs的阳极.
  • 为了证明Gr@Si@C在高能量密度LIB应用中的潜力.

主要方法:

  • 机械融合工艺用于合成Gr@Si@C球形复合材料.
  • 由毛细血管力形成的复合材料独特的核心外结构的特征.
  • 电化学测试包括容量,循环稳定性和能量密度测量.

主要成果:

  • 在100个循环后,Gr@Si@C复合材料表现出1622mAhg-1的高容量和72.2%的容量保留.
  • 实现了4.2 mAh cm-2的高面积容量.
  • 与商业石墨混合的电极显示出出色的容量保留和库伦比效率.

结论:

  • Gr@Si@C复合结构有效地克服了固有的局限性.
  • 在实用的Si含量LIB中,Gr@Si@C阳极可以实现高能量密度 (820 Wh L-1).
  • 这种复合材料显示出商业化高性能LIBs的重大前景.