CNTs/LiV₃O₈/Y₂O₃ Composites with Enhanced Electrochemical Performances as Cathode Materials for Rechargeable Solid-State Lithium Metal Batteries

Abstract

Solid-state lithium metal battery (SSLMB) is regarded as a safer energy storage system compared to the liquid one. The performance of the SSLMB depends on the cathode performance and the side reactions derived from the interface of the cathode and the electrolyte, which becomes much severe at high temperatures. Herein, we carried out a facile spray-drying route to prepare a CNTs/LiV3O8/Y2O3 (M-LVO-Y) composite. The synthesized cathode material exhibits an outstanding Li+ storage performance with a high reversible capacity of 279.9 mA h g–1 at 0.05 A g–1, excellent power capability (182.5 mA h g–1 at 2 A g–1), and a long cycle lifespan of 500 cycles with a capacity retention of 66.5% at a current density of 1 A g–1. The fabricated rechargeable solid-state Li/M-LVO-Y-2 lithium metal battery (LMB) with a poly­(ethylene oxide) (PEO)-based solid polymer electrolyte (SPE) achieves a high discharge capacity of 302.1 mA h g–1 at 0.05 A g–1 and a stable cycling performance with the highest capacity of 72.1% after 100 cycles at 0.2 A g–1 and 80 °C. The above battery performance demonstrates that SSLMBs with the CNTs/LiV3O8/Y2O3 cathode and the PEO-based SPE film can provide high energy density and are suitable for applying in a high-temperature environment.

LiV3O8 and Graphene Oxide Nanocomposite as a Cathode in Lithium-Ion Batteries

“…However, the comprehensive lithium storage performance of bulk LiV 3 O 8 is not satisfactory and still faces the issues of irreversible phase transition and capacity decay. In order to overcome this defect, researchers have processed LiV 3 O 8 into various nanostructures. − Moreover, these nano-LiV 3 O 8 are doped or combined with conducting polymers and carbonaceous materials, which achieve beneficial modification effects. − Whereas, some synthetic methods involve complicated techniques, tedious procedures, or special professional equipment, always accompanied by problems of time-consuming, low throughput, high energy consumption, and cost.…”