高效的离子穿孔网络,用于高性能全固态阴极
Guangzeng Cheng1, Hao Sun1, Haoran Wang1
1School of Materials Science and Engineering, Ocean University of China, Qingdao, 266404, China.
Advanced materials (Deerfield Beach, Fla.)
|February 19, 2024
概括
开发一个高效的离子透网络是所有固态电池 (ASSLB) 的关键. 磁性操纵产生垂直对齐的Li0.35La0.55TiO3纳米线,使离子导电率翻倍,并提高ASSLB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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 全固态电池 (ASSLB) 受到低阴极负载和低速率性能的阻碍,限制了能量和功率密度.
- 传统的高离子导电性和低界面电阻的目标不足以克服这些局限性.
- 阴极内的离子运输通路的结构和连接性对于ASSLB的性能至关重要.
研究的目的:
- 调查离子透网络结构对ASSLB电化学性能的影响.
- 开发一种方法,在固态阴极中创建一个高效的离子透网络.
- 通过优化阴极架构来证明ASSLB的能量和功率密度得到了改善.
主要方法:
- 使用磁性操纵,在固态阴极中实现Li0.35La0.55TiO3纳米线 (LLTO NW) 的垂直对齐.
- 制造完全固态LiFePO4/Li细胞与聚乙烯氧化物) 电解质.
- 评估电化学性能,包括在各种C率和温度下保持容量,以及面积容量.
主要成果:
- 与随机分布的LLTO NW阴极相比,垂直对齐的LLTO NW阴极的离子导电率翻了一番.
- 全固态LiFePO4/Li电池在60°C时实现了151 mAh g-1 (2C) 和100 mAh g-1 (5C) 的高容量.
- 在2°C时的室温容量为108 mAh g-1和高面积容量为3 mAh cm-2与20 mg cm-2的LFP负载被证明.
- 该策略已成功应用于LiNi0.8Co0.1Mn0.1O2阴极,显示其普遍性.
结论:
- 通过LLTO NWs的垂直对齐来实现高效的离子透网络,对于ASSLB的性能来说比以前想象的更为关键.
- 这种磁性操纵策略显著提高了ASSLBs的离子导电性和电化学性能.
- 这些发现为设计高能和高功率全固态电池提供了新的途径.
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