In situ interfacial architecture of lithium vanadate-based cathode for printable lithium batteries

Abstract

Summary Most Li 3 VO 4 anodes are obtained by pre-architecture methods in which Li 3 VO 4 anode materials are prepared with more than six key processes including high-temperature annealing and long preparation time. Herein, we propose an in situ post-architecture strategy including Li 3 VO 4 -precursor solution (ink) preparation and then annealing at 250°C. The integrated Li 3 VO 4 based electrode not only possesses good electrical conductivity and porous microstructure but also has superior stability because of Cu anchoring and inclusion by in situ catalysis. The integrated electrode demonstrates a high reversible capacity (865 mA h g −1 at 0.2 A g −1 ) and good cyclability (100% capacity retention after 200 cycles at 1 A g −1 ). More importantly, the post-architecture electrode has a high energy density of 773.8 Wh kg −1 , much higher than reported Li 3 VO 4 -based materials, as well as most cathodes. Therefore, the electrode could be used to the printable cathode of low-voltage high-energy-density lithium batteries.