钙钛矿型 CsGeI3 作为全固态锂硫电池电解质添加剂,Energy & Fuels

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钙钛矿型 CsGeI3 作为全固态锂硫电池电解质添加剂
Energy & Fuels ( IF 5.2 ) Pub Date : 2023-09-22 , DOI: 10.1021/acs.energyfuels.3c03228
Peng-Fei Wang _{1,

2} , Yi-Han Zhao _{1,

2} , Shu-Hui Tian _{1,

2} , Zihan Shen ₃ , Ting-Feng Yi _{1,

2}

Affiliation

聚环氧乙烷（PEO）基固态锂硫（Li-S）电池因其在安全性和高能量密度方面的优势而受到广泛关注。然而，在实践中，同时实现无“穿梭效应”、高离子电导率和优于锂的稳定性仍然具有挑战性。为了解决这些问题，这项工作提出了一种新型钙钛矿型添加剂，CsGeI ₃，进入聚合物电解质。一方面，带有金属离子键的添加剂可以吸附溶解的多硫化物，从而抑制“穿梭效应”。另一方面，添加剂可以降低PEO的结晶度，从而提高离子电导率。此外，该添加剂可以与锂金属反应生成均匀致密的界面层，进一步阻止多硫化物与锂金属的反应，优化电极的库仑效率。这种聚合物固态电解质应用于Li-S电池时表现出优异的电化学性能，提供1141.9 mA hg ^{–1的比容量}在0.2 C下保持稳定循环100次，保留率为72%。总体而言，这项工作将开发一种基于钙钛矿型CsGeI ₃添加剂的新型聚合物电解质，为高比能量电池系统的实际应用提供可行的解决方案。

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Perovskite-Type CsGeI3 as an Electrolyte Additive for All-Solid-State Lithium–Sulfur Batteries

Poly(ethylene oxide) (PEO)-based solid-state lithium–sulfur (Li–S) batteries have received widespread attention for their advantages in terms of safety and high energy density. However, in practice, they still remain challenging to simultaneously realize no “shuttle effect”, high ionic conductivity, and superior stability to Li. In addressing these issues, this work proposes a novel perovskite-type additive, CsGeI₃, into the polymer electrolyte. On the one hand, the additive with a metal ion bond can adsorb the dissolved polysulfides, thereby inhibiting the “shuttle effect”. On the other hand, the additive can reduce the crystallinity of PEO, thus improving the ionic conductivity. Moreover, the additive can react with Li metal to generate a uniform and dense interface layer, which can further block the reaction of polysulfides with Li metal and optimize the Coulombic efficiency of electrodes. This polymer solid-state electrolyte exhibits excellent electrochemical performance when applied to Li–S batteries, providing a specific capacity of 1141.9 mA h g^–1 at 0.2 C and maintaining stable cycling for 100 cycles with a retention rate of 72%. Overall, this work will develop a novel polymer electrolyte based on perovskite-type CsGeI₃ additives, providing a feasible solution for the practical application of a high specific energy battery system.

更新日期：2023-09-22

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