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Updated: Jul 4, 2025

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications

Published on: August 12, 2013

Regenerated Graphite Electrodes with Reconstructed Solid Electrolyte Interface and Enclosed Active Lithium Toward

Yongsheng Ji¹, Hao Zhang¹, Dan Yang¹

¹State Key Laboratory of Material Processing and Die and Mold Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China.

Advanced Materials (Deerfield Beach, Fla.)

|February 7, 2024

Summary

This study upcycles degraded graphite anodes by fast heating, creating a robust solid electrolyte interface (SEI) and retaining active lithium. This regeneration strategy enhances battery performance and reduces waste.

Keywords:

Coulombic efficiency SEI reconstruction battery recycling graphite upcycling transient heating

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Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

The solid electrolyte interface (SEI) on graphite anodes is crucial for Coulombic efficiency (CE) and cycling stability in lithium-ion batteries.
Degraded graphite anodes contain residual SEI and active lithium, but current regeneration methods destroy these valuable components.

Purpose of the Study:

To develop a novel strategy for upcycling degraded graphite anodes by preserving and enhancing the SEI and residual lithium.
To improve the performance of regenerated graphite electrodes for lithium-ion batteries.

Main Methods:

A fast-heating strategy (1900 K for ≈150 ms) was employed to treat degraded graphite anodes.
The strategy converts the original loose SEI into a compact, inorganic SEI with increased Young's Modulus while retaining residual lithium activity.

Main Results:

The regenerated graphite exhibited a high initial CE of 104.7% in half-cells.
Full cells using LiFePO4 cathodes with regenerated graphite showed improved initial CE (98.8% vs. 83.2%) and energy density (309.4 vs. 281.4 Wh kg⁻¹).

Conclusions:

The fast-heating upcycling strategy effectively transforms waste graphite into high-value, prelithiated electrodes.
This approach offers significant economic and environmental benefits by enabling efficient battery material reuse.