Issue 17, 2020

Reducing interfacial resistance of a Li1.5Al0.5Ge1.5(PO4)3 solid electrolyte/electrode interface by polymer interlayer protection

Abstract

High interfacial resistance of an electrode/electrolyte interface is the most challenging barrier for the expanding application of all-solid-state lithium batteries (ASSLBs). To address this challenge, poly(propylene carbonate)-based solid polymer electrolytes (PPC-SPEs) were introduced as interlayers combined with a Li1.5Al0.5Ge1.5(PO4)3 (LAGP) solid state electrolyte (SSE), which successfully decreased the interfacial resistance of the SSE/electrolyte interface by suppressing the reduction reaction of Ge4+ against the Li metal, as well as producing intimate contact between the cathode and electrolyte. This work provides a systematic analysis of the interfacial resistance of the cathode/SSE, Li/SSE and the polymer/LAGP interfaces. As a consequence, the interfacial resistance of the Li/SSE interface decreased about 35%, and the interfacial resistance of the cathode/SSE interface decreased from 3.2 × 104 to 543 Ω cm2. With a PPC–LAGP–PPC sandwich structure composite electrolyte (PLSSCE), the all-solid-state LiFePO4/Li cell showed a high capacity of 148.1 mA h g−1 at 0.1C and a great cycle performance over 90 cycles.

Graphical abstract: Reducing interfacial resistance of a Li1.5Al0.5Ge1.5(PO4)3 solid electrolyte/electrode interface by polymer interlayer protection

Supplementary files

Article information

Article type
Paper
Submitted
28 1 2020
Accepted
03 3 2020
First published
09 3 2020
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2020,10, 10038-10045

Reducing interfacial resistance of a Li1.5Al0.5Ge1.5(PO4)3 solid electrolyte/electrode interface by polymer interlayer protection

L. Wang, D. Liu, T. Huang, Z. Geng and A. Yu, RSC Adv., 2020, 10, 10038 DOI: 10.1039/D0RA00829J

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