The synergy mechanism of CsSnI3 and LiTFSI enhancing the electrochemical performance of PEO-based solid-state batteries

Rui Sun, Ruixiao Zhu, Jiafeng Li, Zhongxiao Wang, Yuting Zhu, Longwei Yin, Chengxiang Wang, Rutao Wang, Zhiwei Zhang
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Abstract

Lithium metal solid-state battery is the first choice of batteries for electromobiles and consumer electronic products because of the specific capacity of 3860 mAh g−1 and high electrochemical potential (−3.04 V) of Li metal. Flexible polymer solid electrolytes have become the optimal solution to produce high energy density lithium batteries with arbitrary size and shape. In this work, we introduce a halide perovskite, CsSnI3, into the polyethylene oxide/lithium bis-(trifluoromethanesuphone)imide (PEO–LiTFSI) polymer matrix. The CsSnI3 could form a LixSn alloy with Li, leading to homogenization of the electric field and Li+-flux at the interface, Sn atom also bonds with the TFSI anion to provide more dissociated Li+. Besides that, the I atom could interact with Li to form an electronic insulation with a strong blocking effect on electron tunneling. As a proof of concept, the synergy mechanism of the PEO–LiTFSI–CsSnI3 electrolyte improves the stable cycle life of the symmetric battery to more than 500 h, and the Li+ conductivity raised to 6.1 × 10−4 S cm−1 at 60°C. The application of the “zwitter ions analog” halide perovskite in PEO–LiTFSI provides a new choice among various methods to improve the electrochemical performance of polymer solid-state batteries.

Abstract Image

CsSnI3和LiTFSI提高聚醚醚酮固态电池电化学性能的协同机制
金属锂固态电池具有 3860 mAh g-1 的比容量和高电化学电位(-3.04 V),是电动汽车和消费电子产品的首选电池。柔性聚合物固体电解质已成为生产任意尺寸和形状的高能量密度锂电池的最佳解决方案。在这项研究中,我们在聚氧化乙烯/双(三氟甲磺酸)亚胺锂(PEO-LiTFSI)聚合物基体中引入了卤化物包晶 CsSnI3。CsSnI3 能与 Li 形成 LixSn 合金,导致界面上电场和 Li+ 通量的均匀化,Sn 原子还能与 TFSI- 阴离子结合,提供更多离解的 Li+。此外,I 原子还能与 Li 相互作用,形成电子绝缘层,对电子隧道具有很强的阻挡作用。作为概念验证,PEO-LiTFSI-CsSnI3 电解质的协同机制将对称电池的稳定循环寿命提高到 500 小时以上,60°C 时的 Li+ 电导率提高到 6.1 × 10-4 S cm-1。在 PEO-LiTFSI 中应用 "齐聚物离子类似物 "卤化物包晶为改善聚合物固态电池的电化学性能提供了一种新的选择。
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