Interfacial Electric Field Enhanced Free‐Standing VO₂/rGO Aerogel Anode with Ultra High Mass Energy Density for Aqueous Ammonium Ion Battery

Abstract

Aqueous batteries have become a promising means of energy storage due to its environmental friendliness. Nevertheless, it often exhibits limited energy density that hinder their application. Considering that ammonium ion (NH4+) has a low mass and a small hydration radius, aqueous ammonium ion batteries (AAIBs) are expected to solve the problem of low energy density. Herein, we obtain Vanadium dioxide/reduced graphene oxide aerogel (VOGA) by in‐situ growth of VO2 on the graphene surface for interfacial electric field enhanced AAIBs to achieve high mass energy density. The VOGA free‐standing electrode achieves a specific capacity of up to 655 mA g−1 at a current density of 0.5 A g−1. And the mass energy density of the VOGA.