用于高速离子储能的氧化
Kent J Griffith1, Kamila M Wiaderek2, Giannantonio Cibin3
1Department of Chemistry, University of Cambridge, Cambridge, UK.
Nature
|July 27, 2018
概括
研究人员开发出新型的氧化, 这一突破为纳米缩放提供了替代方案,
科学领域:
- 材料科学
- 电化学
- 固态化学
背景情况:
- 离子电池的性能受到活性材料内的离子和电子传输的限制.
- 纳米缩放的活性颗粒提高了充电速度,但损害了体积密度,成本和稳定性.
- 对于先进的电池技术来说,开发用于快速离子介质的替代材料至关重要.
研究的目的:
- 研究复杂的氧化作为潜在的高速电极材料.
- 探索使用微米大小的粒子进行快速离子插入的可行性.
- 了解这些氧化物中的快速固态运输机制.
主要方法:
- 合成和表征Nb16W5O55和Nb18W16O93复合氧化物
- 离子间隔和扩散系数的电化学测量.
- 分析晶体结构,包括晶体剪切和类似青铜的安排.
- 性能指标与传统电池材料,如Li4Ti5O12和LiMn2O4进行比较.
主要成果:
- Nb16W5O55和Nb18W16O93在微米大小的颗粒中表现出高间隔率.
- 室温离子扩散系数比典型的电极材料高数量级.
- 这些氧化物由于多电子氧化还原和缓冲体积膨胀,具有出色的体积容量和速率性能.
- 拓与的多面体结构有助于快速运输固态.
结论:
- 复杂的氧化为高功率,快充的离子电池提供了可行的替代方案.
- 独特的结构和电子特性使微米大小的颗粒能够高效化.
- 这些发现对储能系统,电极设计和材料发现有重大影响.
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