基于LaCl3的化固体电解质具有高离子导电性,用于全固态电池
Chengyu Fu1, Yifan Li2, Wenjie Xu3,4
1School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, Anhui, China.
一个新的基于LaCl3的导体 (Na1-xZrxLa1-xCl4) 显示出对固态电池的高离子导电性和稳定性. 这种材料可以在全固态电池中实现高性能,这对于下一代能源存储至关重要.
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
- 固态化学 固态化学
背景情况:
- 高性能全固态电池需要具有出色的离子导电性,可压缩性和氧化稳定的阴极体.
- 目前对阴解材料的限制阻碍了固态储能器件的效率和寿命.
研究的目的:
- 合成和表征一种基于LaCl3的Na+超离子导体,用于作为全固态电池中的催解质.
- 研究合成材料的结构和离子传输特性及其对电池性能的影响.
主要方法:
- 固态反应与材料合成的机械化学方法相结合.
- 用于结构分析的X射线衍射 (XRD).
- 第一个原则的计算和X射线吸收细结构 (XAFS) 了解离子导电机制.
主要成果:
- 一个六边形Na1-xZrxLa1-xCl4相,具有高离子导电性 (2.9 × 10-4 S cm-1在30°C) 和高氧化潜力 (3.80 V对Na2Sn) 已成功准备.
- Na+ 离子沿 c 轴形成一维的扩散通道,导电性受到通道大小和 Na+/La3+ 混合的影响.
- 使用这种材料作为催解体的全固态电池的初始容量为114 mAh g-1 ,在70个周期内在0.3°C下保持88%的容量.
结论:
- 合成的基于LaCl3的Na+超离子导体对高性能全固态电池具有有前途的性能.
- 材料的结构和离子运输机制是明确的,为进一步优化提供了途径.
- 证明的电池性能表明了这种材料在实际储能应用中的潜力.
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