All-Solid-State Rechargeable Lithium Metal Battery with a Prussian Blue Cathode Prepared by a Nonvacuum Coating...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• All-solid-state batteries offer enhanced safety and energy density compared to conventional lithium-ion batteries.
• Developing scalable and cost-effective fabrication methods for thin-film solid-state batteries is crucial for commercialization.
• Prussian blue analogues are promising cathode materials due to their open framework structure and tunable electrochemical properties.

Purpose of the Study:

• To fabricate a thin-film all-solid-state lithium-ion battery using Prussian blue cathode and LiPON solid electrolyte.
• To investigate the electrochemical performance of the fabricated battery at various temperatures.
• To demonstrate the feasibility of combining nonvacuum and vacuum techniques for environmentally friendly battery production.

Main Methods:

• Fabrication of a Prussian blue LiFeFe(CN)₆ thin-film cathode via nonvacuum coating.
• Deposition of a lithium phosphorus oxynitride (LiPON) solid electrolyte thin film using radio-frequency magnetron sputtering.
• Assembly of a lithium metal anode onto the LiPON film via thermal evaporation.

Main Results:

• Successfully fabricated a 16 μm thick all-solid-state LiFeFe(CN)₆/LiPON/Li battery.
• The battery demonstrated a discharge capacity of 82.5 mA h/g at 60 °C for the third cycle.
• Stable cyclic performance was observed over 200 cycles, with operation feasible between -30 °C and 80 °C.

Conclusions:

• The developed fabrication process, combining nonvacuum and vacuum techniques at low temperatures, is feasible for producing all-solid-state lithium-ion batteries.
• The Prussian blue cathode material exhibits promising electrochemical properties for solid-state battery applications.
• This approach offers an environmentally friendly and potentially scalable route for next-generation energy storage devices.