Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 860, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.157915
Keywords
Composite electrolyte; Polyethylene oxide; Li6.75La3Zr1.75Ta0.25O12; Solvent-free method; All-solid-state batteries
Categories
Funding
- National Natural Science Foundation of China [21805182]
Ask authors/readers for more resources
A composite electrolyte membrane incorporating LLZTO was prepared by a solvent-free hot rolling method, showing excellent ionic conductivity and cycle performance in all-solid-state batteries, with good mechanical properties and interface stability.
Solid electrolyte membrane plays a vital role in the application of all-solid-state batteries. In this paper, composite electrolyte membranes incorporating commercial submicron Li6.75La3Zr1.75Ta0.25O12 (LLZTO) are prepared by solvent-free hot rolling method. It is found that the addition of LLZTO to the PEO-LiTFSI-based electrolyte can effectively reduce the crystallinity of PEO, improve the ion conductivity, voltage window, mechanical properties and interfacial stability of the composite solid electrolyte membrane. The composite electrolyte membrane with the optimal LLZTO content of 10 wt% exhibits a maximum ionic conductivity of 3.03 x 10(-4) S cm(-1) at 55 degrees C and a maximum elongation break of 74.8%. And also, the lithium symmetric cell assembled with 10 wt% LLZTO membrane exhibits the lowest polarization voltage and the best cycle performance, which can be attributed to the enhanced mechanical properties of the membrane and the lower and stable interfacial resistance between the membrane and lithium metal. The all-solid-state LiFePO4/Li batterie delivers a high specific capacity of 155.8 mAh g(-1) at 0.1C rate at 55 degrees C, and exhibits excellent cycle performance and rate performance. In addition, the pouch cells assembled with PEO-LiTFSI-10LLZTO composite electrolyte membrane can still maintain the pristine voltage of 3.39 V and power light-emitting diodes (LEDs) under harsh conditions such as cutting, showing an excellent safety performance. (C) 2020 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available