基于-石墨烯复合阳极和扩展石墨阴极的高性能双离子电池
Guoshun Liu1, Xuhui Liu1, Xingdong Ma1
1School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, China.
Molecules (Basel, Switzerland)
|June 10, 2023
概括
研究人员开发了一种用于双离子电池 (DIB) 的-石墨烯复合阳极. 这种先进的阳极显著提高了能量密度和稳定性,克服了传统阳极在高性能储能方面的局限性.
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:
- 双离子电池 (DIBs) 提供高电压,低成本和安全性,利用同时的离子和离子间隙.
- 石墨阴极是常见的,因为它们能够在高电压下 (高达5.2V与Li+/Li相比) 插入离子.
- 阳极具有较高的理论容量 (4200 mAh g-1),但由于体积膨胀和导电性差,限制了它们在DIB中的使用.
研究的目的:
- 开发用于双离子电池 (DIB) 的稳定和高容量的阳极.
- 为了应对DIB应用中阳极体积膨胀和低导电性的挑战.
- 通过将先进的阳极材料与已知阴极材料相结合,提高DIB的能量密度.
主要方法:
- 使用现场静电自组装和后减少,制造强度合的和石墨烯复合材料 (Si@G) 阳极.
- 研究Si@G阳极在半电池配置中的性能,与裸体Si阳极相比.
- 使用Si@G阳极和扩展石墨 (EG) 阴极组装和测试全DIB.
主要成果:
- Si@G阳极表现出优越的容量保留,在100个循环后保持1182.4 mAh g-1,而裸体Si阳极的435.8 mAh g-1.
- 全Si@G//EG DIB实现了367.84 Wh kg-1的高能量密度,功率密度为855.43 W kg-1.
- 改进的电化学性能归因于受控的体积膨胀,增强的导电性和阳极和阴极之间匹配的动力学.
结论:
- 开发的Si@G复合阳极有效地减轻了的缺点,使得高性能DIBs成为可能.
- 这项工作提出了一个有前途的战略,用于创建高能量密度的双离子电池.
- Si@G//EG 系统显示出下一代储能解决方案的巨大潜力.
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