N-Doped Carbon-Wrapped Cobalt–Manganese Oxide Nanosheets Loaded into a Three-Dimensional Graphene Nanonetwork as a Free-Standing Anode for Lithium-Ion Storage

Abstract

A high-quality and centimeter-level three-dimensional (3D) nitrogen-doped graphene (NG) nanonetwork is synthesized via a chemical vapor deposition method to serve as a substrate and a current collector, which directly germinates active metal oxides to act as a free-standing electrode in lithium-ion batteries. By means of facile electrodeposition and annealing processes, the tetragonal spinel cobalt–manganese oxide nanosheets wrapped with polypyrrole pyrolytic carbon are in situ hybridized with a 3D NG nanonetwork. In particular, the introduced carbon protective layer can enhance the Li-ion storage capacity and cycle stability of the composite electrode. The metallic synergistic effect and rational carbonaceous hybridization jointly provide high-performance charge storage and cycle stability. Notably, the surface-controlled capacitive effect stands out contributing to the total charge storage more than ever in nanostructure electrodes.

Co3O4 nanoparticle modified N, P co-doped carbon paper as sodium carrier to construct stable anodes for Na-metal batteries

“…This approach ensures uniform sodium stripping/deposition, mitigates Na dendritic formation, lowers local current density, and minimizes electrode size variations. 18,19 For example, the Sun and his coworkers have carbonized cotton cloth to form a 3D carbon material with sodiophilicity, and injected molten sodium into the above framework to synthesize the composite anodes, which showed excellent stability and cycling performance. 20 Besides, Dong et al, employed the copper phosphide mesh as the current collector for sodium metal electrodeposition, enhancing the battery performances dur to their good sodiophilicity.…”

A WS2/Co9S8 heterostructure with a carbon layer anchored in nitrogen-doped graphene foam as an anode for boosting lithium storage

“…Nowadays, TMS growth on free-standing collectors as working electrodes, such as carbon paper, carbon cloth, and metal foam, has become a new exploration target. 20,21 High mechanical strength self-supported electrodes are advantageous for full active site exposure and improved electrical conductivity. 22,23 Lately, three-dimensional nitrogen-doped porous graphene (NPG) foam has been shown to be utilized as a self-supported substrate without a binder to increase the reversible capacity by increasing the active surface area.…”

Camphene-Assisted Fabrication of Free-Standing Lithium-Ion Battery Electrode Composites

“…Other studies have shown the possibility to completely eliminate CCs by fabricating free-standing electrodes (FSEs). ,,− Many metal-foil-free CCs have previously been produced using a variety of active materials and manufacturing methods, including slurry-casting on glass, high-pressure/high-temperature filtration, , and 3D printing. , Unfortunately, most of these FSEs suffer from low specific capacities due to poor accessibility of active materials or insufficient electronic conductivities through the scaffolding matrix. Cathode active materials are currently the most expensive components of LIB electrodes and therefore must be fully utilized to obtain commercial viability.…”