A prototype of dual-ion conductor for all-solid-state lithium batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• All-solid-state batteries (ASSBs) offer enhanced safety and energy density but face challenges in kinetics and interfacial compatibility.
• Inadequate ion transport and interface issues hinder the practical application of ASSBs.

Purpose of the Study:

• To address kinetic and interfacial challenges in ASSBs.
• To develop a novel dual-ion conductor for improved ASSB performance.
• To explore a new strategy for state-of-the-art ASSB development.

Main Methods:

• Development of a dual-ion conductor synchronizing Li+ and Cu+ ions.
• Construction of an all-solid-state battery prototype using the dual-ion conductor.
• Electrochemical characterization including capacity, cycling stability, rate performance, and temperature tolerance.

Main Results:

• The dual-ion conductor facilitated a reversible four-electron redox reaction with fast kinetics.
• The ASSB achieved a high reversible capacity of 603.0 mA·hour g−1 and 93.2% retention over 1500 cycles.
• Exceptional performance was observed, including operation at -60°C and a rate capability of 231.6 mA·hour g−1 at 20 mA cm−2.

Conclusions:

• The introduction of Cu+ into Li6PS5Cl creates an efficient ion migration pathway, enhancing electrochemical performance.
• The dual-ion conducting strategy offers a promising approach for developing advanced ASSBs.
• This work provides a new perspective for designing high-performance and safe ASSBs.