通过修改微观结构,提高使用基于Fe的多硫化物正极材料的全固态电池的速率能力
Tomonari Takeuchi1, Noboru Taguchi1, Mitsunori Kitta1
1National Institute of Advanced Industrial Science and Technology (AIST) Midorigaoka 1-8-31, Ikeda Osaka 563-8577 Japan takeuchi.tomonari@aist.go.jp.
RSC advances
|February 29, 2024
概括
研究人员开发了一种新的含铁和的多硫化物材料,用于高容量的全固态电池. 这种先进的电极材料表现出卓越的性能和速率能力,为下一代储能铺平了道路.
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:
- 与传统的离子电池相比,全固态电池 (ASSB) 提供了更高的安全性和能量密度.
- 开发高性能正极材料对于推进ASSB技术至关重要.
- 基于聚硫化物的材料是有希望的,因为它们具有很高的理论能力.
研究的目的:
- 为ASSB正电极合成和表征一种新的含Fe和Li的多硫化物复合物.
- 研究复合材料的微观结构与其电化学性能之间的关系.
- 评估ASSB中新材料的特定容量和速率能力.
主要方法:
- 复合材料制备,涉及铁 (Fe) 和 (Li) 聚硫化物.
- 在全固态电池中对复合物的电化学测试.
- 高分辨率传输电子显微镜 (HR-TEM) 用于微观结构分析.
主要成果:
- 成功制备了一个Li8Fe5-Li2FeS2复合材料.
- 实现了超过500 mA h g-1的高特异性容量.
- 在全固态电池中证明了提高速度的能力.
- HR-TEM揭示了一个复合微观结构与共存的Li2FeS2,FeS晶体和Li2S.
结论:
- 这种新的含有Fe和Li的聚硫化物复合物对ASSB具有出色的电化学性能.
- 独特的微观结构,具有共存的相,是提高电池性能的关键.
- 这种材料在开发用于固态电池的高性能正电极方面取得了重大进展.
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