A flexible solid-state lithium battery with silver nanowire/lithium composite anode and V2O5 nanowires based cathode

Abstract

Lithium-ion batteries have been widely used in portable electronic devices, electric vehicles and other fields in daily life, which has stimulated the exploration of new electrode materials with high energy density and long cycle life. So far, V2O5 have attracted much attention due to its high capacity and excellent layered structure, but its cycle stability is still a problem which was caused by poor structural stability and relatively low electronic conductivity. Here, a flexible solid-state lithium battery is fabricated with V2O5 nanowire-carbon nanotubes (CNT) composite paper as cathode, silver nanowire/lithium composite as anode. The discharge capacity of the full cell reaches 222.2 mAh g−1 at 0.1 C. It can be stably cycled for more than 500 cycles at 0.5 C and exhibits an average discharge capacity of 120.9 mAh g−1. By analysis of the lithium metal surface of the symmetric cell after cycling using SEM, it demonstrates that the silver nanowire/lithium composite anode can induce uniform deposition of metallic lithium into the main frame while inhibiting the growth of Li dendrites. This work provides a guide for designing flexible solid-state lithium batteries.