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Enabling long-term oxide based solid-state lithium metal battery through a near room-temperature sintering process.

Hao Sun¹, Zhenhua Liu¹, Mingyang Xin¹

¹National & Local United Engineering Laboratory for Power Battery, Department of Chemistry, Northeast Normal University, Changchun 130024, China.

Journal of Colloid and Interface Science

|September 29, 2023

Summary

A novel cold-sintering process for oxide solid electrolytes (OSEs) uses plastic crystal electrolytes (PCEs) at 60°C, overcoming high-temperature sintering limitations. This method significantly enhances lithium ion transport for practical battery applications.

Keywords:

Cold sintering process Density function calculation Li metal battery Molecular dynamic simulation Oxide solid state battery

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Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature

Published on: December 20, 2016

Area of Science:

Materials Science
Electrochemistry
Solid-State Chemistry

Background:

High-temperature sintering (HTS) over 1000°C is required for oxide solid electrolytes (OSEs) due to grain boundary (GB) resistance.
HTS leads to detrimental side reactions, lithium loss, and increased costs, hindering OSE commercialization.

Purpose of the Study:

To develop a low-temperature sintering method for OSEs.
To improve lithium ion transport across grain boundaries.
To enable practical applications of OSEs in batteries.

Main Methods:

A near-room-temperature (60°C) cold-sintering process was developed.
Plastic crystal electrolyte (PCE) was used to fill grain boundaries.
The performance of Li_1.5Al_0.5Ge_1.5(PO₄)₃ OSE was evaluated.

Main Results:

Lithium ion transport across GBs was 10 times faster than in the bulk phase.
The OSE achieved a room temperature ionic conductivity of 0.25 mS cm^-1.
Li symmetrical cells showed low over-potential (50 mV), and full cells retained 70% capacity after 820 cycles (1.5 years).

Conclusions:

Cold sintering with PCE offers an efficient alternative to HTS for OSE fabrication.
This process enhances ionic conductivity and electrochemical performance.
The developed OSE demonstrates long-term stability for potential battery applications.