Heterogeneous electrolyte membranes enabling double-side stable interfaces for solid lithium batteries

The solid polymer electrolyte (SPE) is one of the most promising candidates for building solid lithium batteries with high energy density and safety due to its advantages of flexibility and light-weight. However, the conventional monolayered electrolytes usually exhibit unstable contacts with either high-voltage cathodes or Li-metal anodes during cell operation. Herein, heterogeneous dual-layered electrolyte membranes (HDEMs) consisting of the specific functional polymer matrixes united with the designed solid ceramic fillers are constructed to address the crucial issues of interfacial instability. The electrolyte layers composed of the high-conductivity and oxidation-resistance polyacrylonitrile (PAN) combined with Li0.33La0.557TiO3 nanofibers are in contact with the high-voltage cathodes, achieving the compatible inter-face between the cathodes and the electrolytes. Meanwhile, the electrolyte layers composed of the high-stability and dendrite-resistance polyethylene oxide (PEO) with Li6.4La3Zr1.4Ta0.6O12 nanoparticles are in contact with the Li-metal anodes, aiming to suppress the dendrite growth, as well as avoid the passivation between the PAN and the Li-metal. Consequently, the solid LiNi0.6Co0.2Mn0.2O2 parallel to Li full cells based on the designed HDEMs show the good rate and cycling performance, i.e. the discharge capacity of 170.1 mAh g(-1) with a capacity retention of 78.2% after 100 cycles at 0.1C and 30 degrees C. The results provide an effective strategy to construct the heterogeneous electrolyte membranes with double-side stable electrode/-electrolyte interfaces for the high-voltage and dendrite-free solid lithium batteries. (C) 2021 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.

Automated summary

The study focuses on constructing heterogeneous dual-layered electrolyte membranes to address the stability issues of the electrode-electrolyte interfaces in solid lithium batteries, achieving good performance in high-voltage and dendrite suppression.