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在FeS₂上构建离子电子导电网络作为高性能阴极,使全固态电池成为可能

Chao Shen¹, Yiqian Liu¹, Yaru Shi¹

¹School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China.

Journal of colloid and interface science

|September 14, 2023

概括

研究人员开发了一种全固态电池 (ASSLB) 的新FeS2阴极,使用双碳框架和Li7P3S11涂层. 这增强了离子和电子传输,改善了电池性能和稳定性,用于下一代储能.

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) 对高能量密度应用具有前景.
挑战包括阴极的低离子/电子导电率和较差的阴极/电解质接口接触.
FeS2 阴极具有吸引力,但存在导电性差和接口问题.

研究的目的:

在FeS2阴极上构建一个新的多离子电子导电网络,用于高能ASSLB.
为了增强离子和电子运输动力学,并改善接口接触.
了解ASSLB中转换型金属硫化物阴极的反应机制.

主要方法:

用 FeS2 阴极制造,内部带有无序碳矩阵,外部带有减少氧化石墨烯 (rGO) 包装.
在FeS2/C微球上形成Li7P3S11电解质涂层.
电化学测试,包括速度能力和循环稳定性测量.
现场X射线光电子光谱 (XPS) 和电荷/电压差异 (dQ/dV) 分析.

主要成果:

在200个循环后,FeS2@C/rGO@Li7P3S11阴极在0.5°C下实现了350.3 mAh/g的可逆放电容量.
双碳框架和Li7P3S11涂层显著改善了离子电子传输和接口接触.
通过包装中间产品,协同效应增强了反应动力学和可逆性.

结论:

开发的阴极结构有效地解决了ASSLB中的导电性和接口问题.
协同作用的策略提供了快速的电子离子转移通道,并提高了循环稳定性.
这项工作为为ASSLBs设计高性能转换型阴极提供了宝贵的见解.

关键词:

所有固态电池都是固态电池.转化型金属硫化物是一种转化型金属硫化物.铁二) /C@rGO@Li七) P三) S十一) 的复合材料.离子电子导电网络离子电子导电网络稳定的接口接口稳定的接口

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