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全集同质化硫/二硫化物复合阴极,用于所有固态硫电池的和接口

Ruyi Fang¹, Yingzuo He¹, Ruojian Ma¹

¹College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China.

ACS applied materials & interfaces

|February 15, 2025

概括

研究人员开发了一种全新的全合一硫/二硫化物复合阴极,用于高性能全固态硫电池 (ASSLSB). 这种设计提高了循环稳定性和反应动力学,为更安全,高能量密度的电池铺平了道路.

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
储能储能储能储能储能储能

背景情况:

全固态硫电池 (ASSLSB) 提供高能量密度和安全性,但面临着诸如循环稳定性差和接口问题等挑战.
现有的ASSLSB与界面不兼容性和缓慢反应动力学作斗争,限制了它们的实际应用.
开发强大的阴极材料对于推进ASSLSB技术至关重要.

研究的目的:

为提高ASSLSB性能,提出一个全合一的硫/二硫化物 (S/CoS2) 复合阴极.
改进ASSLSB中的接口兼容性,反应动力学和离子运输.
为了克服传统的硫基阴极在固态电池应用中的局限性.

主要方法:

通过将硫和同质化二硫化物 (CoS2) 与硫化物固体电解质 (Li6PS5Cl) 通过球磨进行整合,合成了一种全集S/CoS2复合阴极.
复合材料的特征是为了评估其结构和电化学性能.
测试了电池性能,包括放电容量,循环稳定性和速率能力.

主要成果:

在0.25 mA cm-2.2下,S/CoS2阴极表现出极好的初始放电能力 (1584 mAh g-1,99%利用率).
复合阴极在100个循环后保持了915 mAh g-1的高容量,并表现出良好的速率性能 (474 mAh g-1在1.28 mA cm-2).
同质化的CoS2显著改善了界面离子运输,并促进了硫的转化为Li2S,提高了反应动力学和利用率.

结论:

拟议的全合一S/CoS2复合阴极策略有效地提高了ASSLSB的界面兼容性和电化学性能.
这种方法为改善固态硫电池的循环稳定性和反应动力学提供了有希望的解决方案.
这些发现为设计下一代ASSLSB用于先进的储能应用提供了宝贵的见解.

关键词:

一个"全合一"的产品.全固态硫电池是完全固态的硫电池.催化作用的催化效应二硫化物是二硫化物中的一种.均质化效应是同质化的效应.

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