用于固态电池的铜协调纤维素离子导体
Chunpeng Yang1, Qisheng Wu2, Weiqi Xie1
1Department of Materials Science and Engineering, University of Maryland, College Park, MD, USA.
Nature
|October 21, 2021
概括
研究人员开发了一种新的固体聚合物离子导体,用于更安全的高能电池. 通过在纤维素中使用铜离子设计分子通道, 他们实现了快速的离子运输和出色的电化学稳定性.
科学领域:
- 材料科学
- 电化学
- 聚合物科学
背景情况:
- 固态金属电池提供高能量密度和安全性,但面临当前固态离子导体的挑战.
- 无机导体提供快速的离子传输,但缺乏接口接触;聚合物导体提供兼容性,但离子导电性较低.
- 现有的离子导体难以满足先进电池操作的要求.
研究的目的:
- 为先进的电池开发高性能固体聚合物离子导体.
- 在聚合物中设计分子通道以增强离子传输和电化学稳定性.
- 展示一个可通用的策略来创建高效的固态离子导体.
主要方法:
- 协调铜离子 (Cu2+) 与一维纤维素纳米纤维形成分子通道.
- 研究了沿着工程聚合物链运输的离子 (Li+).
- 描述了新导体的离子导电性,转移数和电化学稳定性窗口.
主要成果:
- 在分子链方向上达到高Li+导电性 (1.5 × 10-3 S/cm).
- 证明了高转移率 (0.78) 和广泛的电化学稳定性窗口 (0-4.5V).
- 验证了该方法与其他聚合物和的通用性,显示了各种应用的潜力.
结论:
- 聚合物中的分子通道工程是高性能固体离子导体的可行策略.
- 配合Cu2+的纤维素导体可以在高能量密度电池的厚阴极中进行离子透.
- 这种方法对开发安全,高性能固态电池具有广泛的影响,超出目前的限制.
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