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$In Situ Neutron Powder Diffraction Using Custom-made Lithium-ion Batteries$

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Cathode Interface Construction by Rapid Sintering in Solid-State Batteries.

Jinhang Chen¹, Weiyin Chen¹, Bing Deng¹

¹Department of Chemistry, Rice University, 6100 Main Street, Houston, TX, 77005, USA.

Small (Weinheim an Der Bergstrasse, Germany)

|October 11, 2023

Summary

This summary is machine-generated.

Researchers developed a rapid sintering method to create a thin, conductive interface for solid-state batteries (SSBs). This enhances SSB performance and safety by reducing interfacial resistance, paving the way for practical applications.

Keywords:

LATP cathode interface co-sintering oxide-based solid electrolytes solid-state batteries

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Area of Science:

Materials Science
Electrochemistry
Battery Technology

Background:

Solid-state batteries (SSBs) offer enhanced safety and energy density over traditional lithium-ion batteries.
Oxide-based solid electrolytes (SEs) are favored for their air stability and non-flammability.
High interfacial resistance between SEs and cathodes hinders SSB performance.

Purpose of the Study:

To develop an intimate and robust solid electrolyte-cathode interface for high-performance oxide-based SSBs.
To investigate the impact of rapid sintering on interfacial properties and battery performance.
To demonstrate a scalable method for improving SSB interfaces.

Main Methods:

Fabrication of a thin, conductive interphase between lithium aluminum titanium phosphate (LATP) and lithium cobalt oxide (LCO) using rapid sintering (10 seconds).
Utilizing rapid heating and cooling rates to minimize side reactions and interdiffusion at the interface.
Testing SSBs with thick composite cathodes under room temperature conditions.

Main Results:

A thin, conductive interphase was successfully constructed between the LATP solid electrolyte and LCO cathode.
Rapid sintering effectively restricted detrimental side reactions and interdiffusion.
SSBs achieved a high initial capacity of approximately 120 mAh g⁻¹ over 200 cycles at room temperature.
The rapid sintering method proved adaptable to other cathode systems.

Conclusions:

The construction of an optimized solid electrolyte-cathode interface is crucial for practical solid-state battery design.
Rapid sintering is an effective technique for creating robust and conductive interphases.
This approach offers a promising pathway for developing high-performance and safer solid-state batteries.