Achieving Electronic Engineering of Vanadium Oxide-Based 3D Lithiophilic Sandwiched-Aerogel Framework for Ultrastable Lithium Metal Batteries

Abstract

Lithium (Li) metal is one of the most promising anode materials for the next-generation batteries, which owns superior specific capacity and energy density. Unfortunately, lithium dendrites that is formed during the charging/discharging process tends to induce capacity degradation and thus short lifespan. In this study, the vanadium oxide (V 2 O 5 ) and nitrogendoped vanadium oxide (N−V 2 O 3 , N−VO 0.9 )-modified threedimensional (3D) reduced graphene oxide ((N)−VO x @rGO) with tunable electronic properties are demonstrated to enable the dendrite-free Li deposition. The soft lithiophilic rGO as the scaffold can provide sufficient void space for Li storage. Meanwhile, the rigid (N)−VO x uniformly anchored on rGO can perfectly maintain the 3D structure, which is crucial for Li to enter the inner space of the 3D framework. Consequently, the (N)−VO x @rGO electrodes achieve dendrite-free electrodeposition under the multifarious deposition capacity and current densities. Compared with the bare lithium electrodes, the asymmetrical cells of (N)-VO x @rGO anode can cycle stably up to 400 h at 2 mA cm −2 current density, together with a low nucleation overpotential of ∼20 mV.

Fabrication of an Energy-Dense, Binder-Free Zn//V5O12·6H2O Solid-State In-Plane Flexible Battery via a Rapid and Scalable Approach

“…The technique avoids the usage of polymeric binders and conductive additives and reduces the overall weight of the final device, thereby increasing the gravimetric energy density. Earlier, few attempts have been made to synthesize different VO phases via electrodeposition and these have been employed for supercapacitors and rechargeable battery applications. − Ghosh et al reported electrodeposited V 2 O 5 cathodes for an aqueous zinc ion battery in the coin cell configuration; the cell has shown an impressive initial capacity of 510 mAh/g at 0.25 A/g . However, the cell lacks flexibility in design and the traditional coin cell configurations of the fabricated devices cannot support the advanced flexible electronic devices.…”