A Safe High-Performance All-Solid-State Lithium-Vanadium Battery with a Freestanding V₂O₅ Nanowire Composite Paper...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Vanadium pentoxide (V₂O₅) faces challenges in electronic conductivity and structural stability for battery cathode applications.
• Developing advanced cathode materials is crucial for improving battery performance and safety.

Purpose of the Study:

• To develop a novel V₂O₅-reduced graphene oxide (rGO) composite paper for use as an additive-free cathode.
• To evaluate the electrochemical performance of this composite in high-temperature, high-safety solid polymer electrolyte lithium-vanadium batteries.

Main Methods:

• Fabrication of a V₂O₅ nanowire-rGO composite paper.
• Assembly and testing of lithium-vanadium batteries utilizing the composite cathode with a PEO-MIL-53(Al)-LiTFSI solid polymer electrolyte.
• Electrochemical performance evaluation at 80 °C within a 1.0-4.0 V voltage window.

Main Results:

• The composite cathode achieved an average capacity of 329.2 mAh g^-1 at 17 mA g^-1.
• Demonstrated stable cycling performance over 40 cycles.
• Exhibited fast and stable lithium-ion storage performance at high temperatures.

Conclusions:

• The V₂O₅-rGO composite paper serves as an effective additive-free cathode for high-temperature lithium-vanadium batteries.
• The integration of rGO enhanced electronic conductivity, while the nanowire structure and solid electrolyte network contributed to stability.
• This work presents a promising pathway for flexible and highly safe energy-storage devices.