Graphene-Oxide-Assisted Synthesis of Ga₂O₃ Nanosheets/Reduced Graphene Oxide Nanocomposites Anodes for Advanced Alkali-Ion Batteries

Abstract

Herein, we propose a practical way for direct preparation of gallium oxide nanosheets/reduced graphene oxide (Ga2O3 NSs/rGO) nanocomposites via oxygenic groups contained hydrophilic graphene oxide (GO) template with subsequent annealing treatment. Benefiting from the two-dimensional (2D) nanoarchitecture of Ga2O3 NSs and rGO, Ga2O3 NSs/rGO nanocomposites exhibit enhanced kinetics and improved cycling stability in Li-ion and Na-ion batteries (LIBs/SIBs). The pseudocapacitance performance is authenticated through kinetic analysis. Ex situ XRD and XPS measurements prove that the reversible Li-ion storage in Ga2O3 NSs/rGO electrodes is a conversion reaction and alloying mechanism. In addition, the full cells fabricated by coupling Ga2O3 NSs/rGO anode and LiFePO4/C or Na3V2(PO4)3/C cathodes exhibit outstanding electrochemical performances. In general, such a new approach, which is not specific to Ga2O3 NSs/rGO nanocomposites, offers great opportunities for 2D oxide nanomaterials or nanocomposites as high-performance electrodes.

Li2CO3-affiliative mechanism for air-accessible interface engineering of garnet electrolyte via facile liquid metal painting

“…The other should peak (with lower intensity) at 530.5 eV likely stems from the generation of Ga 2 O 3− x as a consequence of insufficient surface oxidation. After lithiation, Ga 2 O 3 and Ga components are expected to convert into Li x Ga and Li 2 O products 42 . Therefore the Li x Ga (19.1 eV) and Li 2 O (528.5 eV) peaks become dominant in the Ga 3 d and O 1 s spectra, respectively 4 .…”

Uniform gallium oxyhydroxide nanorod anodes with superior lithium-ion storage

“…The intricate pore structure of the GaOOH nanorods can offer plenty nanochannels to promote the contact between electrolyte and surface-interface interactions. 35 Fig. 3a shows the cyclic voltammograms (CVs) of the GaOOH electrode for the initial ve cycles, in voltage range of 0.01-3.0 V vs. Li/Li + at a scan rate of 0.1 mV s À1 .…”

Gallium-based anodes for alkali metal ion batteries

“…Along this line, Yang et al designed the Ga 2 O 3 nanosheets/reduced graphene oxide nanocomposites (Ga 2 O 3 NSs/rGO, Fig. 5a,b) [119], which exhibited a decent and stable electrochemical performance in both LIBs and SIBs. The Ga 2 O 3 NSs/rGO delivered a considerable initial charge/ discharge capacity (843.55 and 1112.73 mA h g À1 ) and Coulombic efficiency (CE, 75.8%) for LIBs.…”