Monolithic All-Solid-State High-Voltage Li-Metal Thin-Film Rechargeable Battery

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Conventional lithium-ion batteries face limitations like flammability and dendrite formation.
• All-solid-state batteries offer improved safety, environmental friendliness, and higher energy density.
• Thin-film batteries are suitable for low-power applications due to their compact and lightweight nature.

Purpose of the Study:

• To develop and characterize a high-voltage, all-solid-state lithium-ion thin-film battery.
• To investigate the performance of a LiNi0.5Mn1.5O4 cathode, LiPON solid electrolyte, and lithium metal anode configuration.
• To compare the performance of the all-solid-state cell with conventional lithium foil counterparts.

Main Methods:

• Layer-by-layer deposition of battery components on stainless-steel substrates.
• Separate analysis of structural and electrochemical properties of individual components.
• Comparative study of solid-state cells versus cells using lithium foil and liquid electrolyte.

Main Results:

• The developed thin-film all-solid-state cell delivered 80.5 mAh g-1 in the first cycle.
• The cell maintained a capacity of approximately 70 mAh g-1 over multiple cycles.
• Achieved gravimetric and volumetric energy densities of 333 Wh kg-1 and 1,212 Wh l-1, respectively.
• Demonstrated superior performance compared to lithium foil-based cells.

Conclusions:

• All-solid-state thin-film batteries are promising for enhanced energy density and safety.
• The interface control is crucial for optimizing the performance of solid-state batteries.
• This study highlights the potential of solid electrolytes in enabling high-voltage, high-energy-density battery designs.