Synergistic Effect of One- and Two-dimensional Connected Coral-like Li$_{6.25}$Al$_{0.25}$La$_3$Zr$_2$O$_{12}$ in PEO-Based Composite Solid State Electrolyte

Jun Cheng; Guangmei Hou; Qing Sun; Xiaoyan Xu; Linna Dai; Jianguang Guo; Zhen Liang; Deping Li; Jianwei Li; Xiangkun Nie; HuanHuan Guo; Zhen Zenga; Xueyi Lu; Lijie Ci

arXiv · 1909.03250

Synergistic Effect of One- and Two-dimensional Connected Coral-like Li$_{6.25}$Al$_{0.25}$La$_3$Zr$_2$O$_{12}$ in PEO-Based Composite Solid State Electrolyte

Jun Cheng·Guangmei Hou·Qing Sun·Xiaoyan Xu·Linna Dai·Jianguang Guo·Zhen Liang·Deping Li·Jianwei Li·Xiangkun Nie·HuanHuan Guo·Zhen Zenga·Xueyi Lu·Lijie Ci

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Abstract

As one of the most promising next-generation energy storage device, lithium metal batteries have been extensively investigated. However, the poor safety issue and undesired lithium dendrites growth hinder the development of lithium metal batteries. The application of solid state electrolytes has attracted increasing attention as they can solve the safety issue and partly inhibit the growth of lithium dendrites. Polyethylene oxide (PEO)-based electrolytes are very promising due to their enhanced safety and excellent flexibility. However, PEO-based electrolytes suffer from low ionic conductivity at room temperature and can't effectively inhibit lithium dendrites at high temperature due to the intrinsic semi-crystalline properties and poor mechanical strength. In this work, a novel coral-like Li6.25Al0.25La3Zr2O12 (LALZO) is synthesized to use as an active ceramic filler in PEO. The PEO with LALZO coral (PLC) exhibits increased ionic conductivity and mechanical strength, which leads to the uniform deposition/stripping of lithium metal. The Li symmetric cells with PLC cycle for 1500 h without short circuit at 50 centidegree. The assembled LiFePO4/PLC/Li batteries display excellent cycling stability at both 60 and 50 centidegree. This work reveals that the electrochemical properties of organic and inorganic composite electrolyte can be effectively improved by tuning the microstructure of the filler, such as the coral-like LALZO architecture.

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Jun Cheng, Guangmei Hou, Qing Sun, Xiaoyan Xu, Linna Dai, Jianguang Guo, Zhen Liang, Deping Li, Jianwei Li, Xiangkun Nie, HuanHuan Guo, Zhen Zenga, Xueyi Lu, Lijie Ci. 2019-09-07. Synergistic Effect of One- and Two-dimensional Connected Coral-like Li$_{6.25}$Al$_{0.25}$La$_3$Zr$_2$O$_{12}$ in PEO-Based Composite Solid State Electrolyte. https://arxiv.org/abs/1909.03250

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