Issue 21, 2021

Applying multi-scale silica-like three-dimensional networks in a PEO matrix via in situ crosslinking for high-performance solid composite electrolytes

Abstract

For a higher safety and energy density, solid-state electrolytes with a better mechanical strength and thermal and electrochemical stability are a perfect choice. To improve the performance of PEO, using low-cost inert fillers may bring amorphous regions but limits easily appear. This paper aims to promote a network of SiO2 nanowires by applying a novel in situ crosslinking structure composed of PEA, γ-GPS and mPEG with siloxane segments as the junctions. The modified network can significantly reduce the crystallinity and glass transformation temperature, which also reduces the activation energy of ion transfer. Crosslinking can be highly influential as a comprehensive function of segment relaxation and ion complexation. The optimal sample (PEO–SNWAKP20) possesses a conductivity of 2.52 × 10−4 at 40 °C and a wide electrochemical window of 5.1 V. This unique structure also brings ideal shape stability under high temperatures, thus realizing stable cycling for 800 h at 0.1 mA cm−2. The rate and cycling performance of the LiFePO4 cell are also improved, achieving a maximum of 131.2 mAh g−1 under 0.5C with 89.3% retention after 50 cycles at 50 °C, realizing 24% improvement compared with single SNW reinforcement. By modifying the electrode, its performance can be further raised to 154 and 130.4 mAh g−1 under 0.5C and 1C, respectively, reserving 97.9% of its capacity after 100 cycles. This may inspire new strategies for synthesizing high-performance composite electrolytes.

Graphical abstract: Applying multi-scale silica-like three-dimensional networks in a PEO matrix via in situ crosslinking for high-performance solid composite electrolytes

Supplementary files

Article information

Article type
Research Article
Submitted
01 Apr 2021
Accepted
25 Jul 2021
First published
30 Jul 2021

Mater. Chem. Front., 2021,5, 7767-7777

Applying multi-scale silica-like three-dimensional networks in a PEO matrix via in situ crosslinking for high-performance solid composite electrolytes

J. Wu, J. Chen, X. Wang, A. Zhou and Z. Yang, Mater. Chem. Front., 2021, 5, 7767 DOI: 10.1039/D1QM00518A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements