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Updated: Sep 25, 2025

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Published on: August 12, 2013

Active Interphase Enables Stable Performance for an All-Phosphate-Based Composite Cathode in an All-Solid-State

Qi Xu^1,2, Zigeng Liu¹, Anna Windmüller¹

¹Forschungszentrum Jülich, Fundamental Electrochemistry (IEK-9), D-52425, Jülich, Germany.

Small (Weinheim an Der Bergstrasse, Germany)

|April 27, 2022

Summary

Researchers developed a stable composite cathode for all-solid-state batteries (ASSBs) using LiFePO4 and Li1.3Al0.3Ti1.7(PO4)3. This novel material overcomes interfacial challenges, enabling high capacity and stable cycling in ASSBs.

Keywords:

LATP redox active interphases co-fired LFP/LATP composite cathodes high areal capacity

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Last Updated: Sep 25, 2025

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Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

All-solid-state batteries (ASSBs) face challenges with high interfacial resistance and unstable interfaces between cathode active materials (CAMs) and solid-state electrolytes (SSEs).
These issues hinder the performance and cycle life of composite cathodes in ASSBs.

Purpose of the Study:

To develop a stable and high-performance composite cathode for bulk-type ASSBs.
To address the interfacial resistance and stability issues in CAM/SSE interfaces.

Main Methods:

A co-firing technique was employed to create an all-phosphate-based composite cathode using LiFePO4 (LFP) and Li1.3Al0.3Ti1.7(PO4)3 (LATP).
The structural and electrochemical properties of the LFP/LATP composite cathode and the formed Li3-xFe2-x-yTixAly(PO4)3 (LFTAP) interphase were investigated.

Main Results:

The composite cathode exhibited a densified structure and a redox-active LFTAP interphase, enhancing ion and electron conductivity.
The ASSB demonstrated stable operation across different voltage ranges with minimal capacity degradation.
A high reversible capacity of 2.8 mAh cm-2 was achieved at 60°C between 4.1 and 2.2 V.
Asymmetric charge/discharge behaviors were observed, attributed to the electrochemically active LFTAP interphase.

Conclusions:

The developed LFP/LATP composite cathode effectively stabilizes the CAM/SSE interface in high mass loading ASSBs.
The co-firing technique provides a simple and effective strategy for fabricating advanced composite cathodes.
The findings contribute to advancing the development of practical all-solid-state batteries.