Mg₂B₂O₅ Nanowire Enabled Multifunctional Solid-State Electrolytes with High Ionic Conductivity, Excellent Mechanical...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Solid-state lithium-ion batteries (SSLIBs) require electrolytes with high ionic conductivity, good mechanical properties, and wide electrochemical windows.
• Poly(ethylene oxide) (PEO)-based electrolytes are promising but often lack sufficient ionic conductivity and mechanical strength for practical applications.

Purpose of the Study:

• To develop multifunctional solid-state electrolytes (SSEs) for SSLIBs by incorporating Mg2B2O5 nanowires into a PEO matrix.
• To investigate the impact of Mg2B2O5 nanowires on ionic conductivity, mechanical properties, electrochemical window, and flame retardancy of PEO-based SSEs.

Main Methods:

• Fabrication of Mg2B2O5 nanowire-reinforced PEO-based solid-state electrolytes.
• Characterization of ionic conductivity, mechanical properties, and electrochemical stability.
• Assembly and testing of SSLIBs using LiFePO4 cathodes and lithium metal anodes.

Main Results:

• The Mg2B2O5 nanowire-enabled SSEs demonstrated enhanced ionic conductivity due to improved PEO chain motion and Li+ migration pathways.
• The composite electrolytes exhibited superior mechanical properties and flame-retardant performance compared to pristine PEO-LiTFSI.
• SSLIBs utilizing these SSEs showed improved rate performance and a cyclic capacity of 150 mAh g-1 at 0.2 C and 50 °C.

Conclusions:

• Mg2B2O5 nanowires effectively enhance the performance of PEO-based SSEs, leading to multifunctional electrolytes.
• This strategy provides a pathway for designing SSLIBs with high ionic conductivity, excellent mechanical properties, and improved safety.
• The developed SSEs show potential for advanced solid-state lithium-ion battery applications.