Graphene Aerogel Supported Fe−Co Selenide Nanocubes as Binder‐Free Anodes for Lithium‐Ion Batteries

Abstract

Metal selenides as anode materials of lithium‐ion batteries (LIBs) has received considerable attention recently. In order to boost the electronic conductivity and alleviate the volume change of electrode materials upon the cycles, a facile strategy is employed in this work, where Prussian blue analogue (PBA) nanocubes are encapsulated into three‐dimensional (3D) network of graphene aerogel (GA), followed by a high‐temperature selenization treatment to isolate the composite of FeCoSe2@GA. The composite can be directly employed as free‐standing anode materials of LIBs. Studies reveal that the FeCoSe2@GA electrode demonstrates an intriguing cycle stability and rate capability with a specific capacity of ∼500 mAh g−1 at 100 mA g−1 after 100 cycles. The outstanding lithium‐storage properties can be attributed to the 3D porous feature as well as the strong confinement effect of GA for FeCoSe2 particles, which provides a large number of ion‐exchange channels, and prevents the severe agglomeration and large volume expansion of active particles during the charge/discharge process.

One-Step Electrochemical Synthesis of Co0.8Fe0.2Se@NiF Spheres Enclosed with Nanoparticles and Integrated Porous FeSe2@NiF as Electrode Materials for High-Performance Asymmetric Supercapacitor

“…The narrow and sharp peaks reflected the high crystallization nature of the sample. The XPS survey spectrum (Figure B) discovered the characteristic spectra of Fe 2p, Se 3d, and O 1s, as well as the high resolution of the Fe 2p spectrum that could be deconvoluted into three peaks at ∼706.39, ∼719.35, and ∼710.50 eV, attributed to iron in Fe 2p 3/2 , Fe 2p 1/2, , and satellite peaks, respectively (Figure C) . Besides, Fe 2s and diverse LMM auger transitions in Fe can be seen in the survey spectrum .…”

Hydrothermal Self-Assembly of α-MnSe-Loaded Honeycomb-Like Biomimetic Ti3C2Tx/Graphene Aerogel Microstructure (α-MnSe/Ti3C2Tx/rGO) as Efficient Electrode Material for Energy Storage Application

“…SnSe nanobelts confined in graphene aerogel have been reported to show a capacity fading of only 0.03% per cycle for 800 continuous cycles, for Li-ion storage . Likewise, FeCoSe 2 nanocubes embedded in graphene aerogel demonstrated an intriguing cyclic stability and rate capability …”

“…43 Likewise, FeCoSe 2 nanocubes embedded in graphene aerogel demonstrated an intriguing cyclic stability and rate capability. 44 Alternatively, MXene (Ti 3 C 2 T x , T x = −OH, −O, −F) is a new class of 2D layered carbon materials with excellent intrinsic electrical conductivity (10,000 S/cm), versatile interface chemistry, and superior hydrophilicity which make it a promising candidate for energy storage. 45−49 However, Ti 3 C 2 T x has only a weak self-gelation ability.…”

Facile Electrodeposition and Aging to Generate 3-Dimensional α-MnO2 Battery Cathodes

“…There are notable efforts to develop 3D cathodes with high areal loading in both aqueous and nonaqueous energy storage devices. 1,7,[10][11][12][13][14][15][16] These designs typically use a 3D current collector such as carbon cloth, graphene foam, and nickel foam or can be directly prepared by 3D direct ink writing. 11,[16][17][18][19] Additionally, 3D porous electrodes provide additional battery specific benefits.…”

“…1,7,[10][11][12][13][14][15][16] These designs typically use a 3D current collector such as carbon cloth, graphene foam, and nickel foam or can be directly prepared by 3D direct ink writing. 11,[16][17][18][19] Additionally, 3D porous electrodes provide additional battery specific benefits. In Li-S batteries, a 3D conductive electrode can compensate for the active material volume expansion and mitigate lithium polysulfide dissolution.…”