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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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Preparation of Graphene Liquid Cells for the Observation of Lithium-ion Battery Material
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基于人造石墨的复合电极用于离子电池.

Sae Min Park1, Tejaswi Tanaji Salunkhe1, Ji Hyeon Yoo1

  • 1Department of Chemical, Biological and Battery Engineering, Gachon University, Seongnam-si 13120, Gyeonggi-do, Republic of Korea.

Nanomaterials (Basel, Switzerland)
|December 17, 2024
PubMed
概括

为先进的离子电池开发了一种新型多孔的人工碳复合阳极. 这种材料显示了增强的离子扩散和高速率能力,使其成为一个有前途的阳极系统.

关键词:
离子电池是一种离子电池.阳极是一种极.人工碳 人工碳高能球磨机高能球磨机

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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:

  • 开发先进的阳极对于提高离子电池性能至关重要.
  • (Si) 具有较高的理论容量,但受到体积扩张问题的困扰.
  • 多孔的人造碳 (PAC) 可以减轻Si体积膨胀并提高导电性.

研究的目的:

  • 为了合成和电化学评估一种新型多孔的人工碳 (PAC) -Si复合阳极.
  • 使用二碳酸 (ABC) 增强孔隙结构和分布.
  • 评估材料对高性能离子电池的潜力.

主要方法:

  • 使用二碳酸 (ABC) 制造PAC-Si复合材料的高能球磨.
  • 使用X射线衍射 (XRD) 和传输电子显微镜 (TEM) 的材料表征.
  • 通过静电间歇定位 (GITT) 和电池循环评估电化学性能.

主要成果:

  • PAC-Si-CB-ABC复合物表现出改善的孔径和表面积,Si分布均.
  • 与传统石墨相比,静电间歇定位 (GITT) 显示出更高的离子扩散.
  • 该PAC55%-Si45%-CB-ABC电极在100mAg-1时达到850mAhg-1的可逆容量,在2000mAg-1时达到600mAhg-1.
  • 一个装有NCM622阴极的完整电池显示了128.9 mAh g-1的可逆循环能力和323.3 Wh kg-1的能量密度.

结论:

  • 开发的PAC-Si-CB-ABC复合物有效地适应体积变化,并增强电化学反应.
  • 复合材料显示出出色的离子扩散和高速率性能.
  • 这种新阳极材料对下一代离子电池具有重大前景.