新的二维和碳化物作为离子电池的有希望的材料
Michael Naguib1, Joseph Halim, Jun Lu
1Department of Materials Science & Engineering, Drexel University , Philadelphia, Pennsylvania 19104, United States.
Journal of the American Chemical Society
|October 23, 2013
概括
合成的二维碳化物 (Nb2C) 和碳化物 (V2C) 作为离子电池的电极材料具有前景,在高充放电率下提供出色的性能.
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:
- 两维 (2D) 材料正在积极研究用于储能应用.
- 作为一类二维过渡金属碳化物和化物,MXenes具有独特的特性.
- 为新型MXenes开发可扩展的合成方法至关重要.
研究的目的:
- 为了合成新的二维碳化物 (Nb2C) 和碳化物 (V2C) 材料.
- 评估它们作为离子电池的电极材料的潜力.
- 研究它们的电化学性能,特别是在高电荷-放电率下.
主要方法:
- 在室温下从母MAX相Nb2AlC和V2AlC中选择性蚀刻Al.
- 合成的2D材料的表征.
- 使用Nb2C和V2C的电池电极的制造和电化学测试.
主要成果:
- 通过低温蚀刻工艺成功合成2DNb2C和V2C.
- 基于Nb2C的电极的可逆容量在1C时为170mA·h·g{-1},在10C时为110mA·h·g{-1}.
- 基于V2C的电极在1°C时表现出260 mA·h·g{-1}的可逆容量,在10°C时表现出125 mA·h·g{-1}的可逆容量.
- 这两种材料都表现出很好的处理高电荷放电率的能力.
结论:
- 选择性蚀刻方法为合成2DNb2C和V2C提供了一条有效的途径.
- 这些新的2D碳化物是高性能离子电池电极的有希望的候选者.
- 证明的速率能力表明了快速充电应用的潜力.
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