Simultaneous High Ionic Conductivity and Lithium-Ion Transference Number in Single-Ion Conductor Network Polymer...

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Science

Background:

• Developing solid-state electrolytes is key for advanced lithium batteries.
• Solid polymer electrolytes offer interfacial compatibility but struggle with high ionic conductivity and lithium-ion transference.
• Achieving both high ionic conductivity and transference number is a critical bottleneck.

Purpose of the Study:

• To develop a single-ion conducting network polymer electrolyte (SICNP) for fast-charging solid-state lithium batteries.
• To overcome the limitations of traditional solid polymer electrolytes.
• To enable fast lithium-ion locomotion with high ionic conductivity and transference number.

Main Methods:

• Design and synthesis of a single-ion conducting network polymer electrolyte (SICNP).
• Experimental characterization of ionic conductivity and lithium-ion transference number.
• Theoretical simulations to understand ion transport mechanisms.
• Fabrication and testing of solid-state lithium batteries with various cathodes.

Main Results:

• SICNP exhibits high ionic conductivity (1.1 × 10^-3 S cm^-1) and a high lithium-ion transference number (0.92) at room temperature.
• The polymer network structure facilitates fast lithium-ion hopping and high charge dissociation.
• Solid-state batteries using SICNP show excellent high-rate cycling (95% retention at 5 C for 1000 cycles) and fast-charging capabilities (6 min charge).

Conclusions:

• The developed SICNP is a promising solid-state electrolyte for fast-charging lithium batteries.
• The material design overcomes critical bottlenecks in ionic conductivity and transference number.
• This work offers a new direction for high-performance solid-state electrolytes.