使用双杂交的三明治/减少氧化石墨烯复合材料,以获得其稳定的储存性能
Yuying Yang1, Rui Zhang2, Qiang Zhang1
1Analytical and Testing Center, Shandong University of Technology, Zibo 255000, China.
Molecules (Basel, Switzerland)
|May 25, 2024
概括
这项研究引入了一种用于离子电池的新/减少氧化石墨烯 (Si/rGO) 复合阳极. 独特的三明治结构增强了稳定性和循环性能,大大改善了电池技术.
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:
- 阳极为离子电池 (LIB) 提供了高的理论容量,但在循环过程中遭受了显著的体积膨胀.
- 减少的石墨烯氧化物 (rGO) 可以减轻的体积变化并提高导电性.
- 现有的复合材料策略往往难以实现长期稳定性和有效缓冲扩张.
研究的目的:
- 设计和合成一种新的/减少氧化石墨烯 (Si/rGO) 复合物,其具有独特的三明治结构,用于增强的LIB阳极.
- 研究氨基修饰和rGO双重组合在提高阳极的电化学性能方面的作用.
- 评估开发的Si/rGO-b复合材料的循环稳定性,速度能力和体积膨胀.
主要方法:
- 纳米颗粒 (m-Si) 的氨基修饰,然后用石墨烯氧化物 (GO) 进行两步复合工艺.
- 形成一个原始的核心外结构 (p-Si/rGO-b) 与m-Si和GO之间的共价键.
- 与GO重组,以创建一个嵌入式Si/rGO-b结构,增强rGO网络和稳定性.
主要成果:
- Si/rGO-b复合物表现出极好的循环稳定性,在超过800个循环后保持82.4%的容量.
- 实现了优越的速率能力,在5A/g时提供300mAh/g.
- 独特的结构有效缓冲了体积膨胀,循环后仅观察到27.4%的膨胀率.
结论:
- 开发的三明治Si/rGO-b结构,利用双重rGO组合,显著提高了阳极的电化学性能.
- 共价键和强大的rGO网络有效地抑制体积变化并提高导电性.
- 这种方法为在离子电池中推进高性能合金类型阳极提供了有前途的战略.
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