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Updated: Jan 9, 2026

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Published on: August 12, 2013

Electron-conductive binder for silicon negative electrode enabling low-pressure all-solid-state batteries.

Seunggoo Jun¹, Minseok Jeong¹, Boyeong Jang¹

¹Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul, 03722, South Korea.

Nature Communications

|December 5, 2025

Summary

A new conductive binder, poly(3,4-ethylenedioxythiophene):poly((styrene sulfonic acid)-co-(maleic acid)) (PEDOT:P(SS-co-MA)), improves silicon all-solid-state batteries. This binder enhances performance and stability, even at low pressures, paving the way for high-energy batteries.

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Last Updated: Jan 9, 2026

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Published on: August 12, 2013

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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques

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Published on: November 11, 2013

Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Silicon electrodes are promising for high-energy all-solid-state batteries (ASSBs) but suffer from poor performance under low operating pressures.
Existing binders often lead to side reactions or insufficient conductivity, limiting the practical application of Si electrodes in ASSBs.

Purpose of the Study:

To develop a novel, scalable, fluorine-free, and water-processable conductive binder for Si electrodes in ASSBs.
To address the challenge of poor electrochemical performance of Si electrodes at low operating pressures.

Main Methods:

Synthesized and characterized poly(3,4-ethylenedioxythiophene):poly((styrene sulfonic acid)-co-(maleic acid)) (PEDOT:P(SS-co-MA)) as a binder.
Fabricated Si electrodes using PEDOT:P(SS-co-MA) and evaluated their electrochemical performance in half and full ASSB cells.
Conducted ex situ measurements to analyze electrode integrity and conductivity changes during cycling.

Main Results:

PEDOT:P(SS-co-MA) demonstrated excellent e-conductivity, eliminating the need for carbon additives and ensuring strong adhesion.
The binder effectively resolved issues of disrupted e-connectivity during delithiation at 5 MPa, improving electrode stability.
ASSBs utilizing PEDOT:P(SS-co-MA) exhibited enhanced electrochemical performance, achieving 134 mAh g⁻¹ at 0.5 C with 86% capacity retention over 100 cycles in half cells and demonstrating high energy density in full cells.

Conclusions:

PEDOT:P(SS-co-MA) is a highly effective binder for Si electrodes in ASSBs, overcoming limitations of previous materials.
The binder's properties enable robust performance even under low-pressure conditions, crucial for practical ASSB applications.
This work highlights PEDOT:P(SS-co-MA) as a promising platform for developing next-generation high-energy ASSBs.