Freestanding three-dimensional core–shell nanoarrays for lithium-ion battery anodes

Abstract

Structural degradation and low conductivity of transition-metal oxides lead to severe capacity fading in lithium-ion batteries. Recent efforts to solve this issue have mainly focused on using nanocomposites or hybrids by integrating nanosized metal oxides with conducting additives. Here we design specific hierarchical structures and demonstrate their use in flexible, large-area anode assemblies. Fabrication of these anodes is achieved via oxidative growth of copper oxide nanowires onto copper substrates followed by radio-frequency sputtering of carbon-nitride films, forming freestanding three-dimensional arrays with core–shell nano-architecture. Cable-like copper oxide/carbon-nitride core–shell nanostructures accommodate the volume change during lithiation−delithiation processes, the three-dimensional arrays provide abundant electroactive zones and electron/ion transport paths, and the monolithic sandwich-type configuration without additional binders or conductive agents improves energy/power densities of the whole electrode.

Bimetal-Organic-Framework Derivation of Ball-Cactus-Like Ni-Sn-P@C-CNT as Long-Cycle Anode for Lithium Ion Battery

“…Owing to high energy density, long‐term cyclic stability, and environmental kindness, lithium ion batteries (LIBs) have been widely used in portable electronic devices, and are one of the most promising energy storage systems for electric vehicles and large‐scale energy storage . However, the commercial graphite anode exhibits a low theoretical capacity of only 372 mA h g −1 . To address this issue, numerous investigations have been made to explore and design new anode materials with high capacity and long cycle life, such as Si, Sn, transitional metal oxides and sulfides .…”

Graphitic Carbon Nitride Film: An Emerging Star for Catalytic and Optoelectronic Applications

“…Traditionally, researchers have applied the physical vapor deposition (PVD) method to deposit amorphous CN (a‐CN) films . Techniques for the deposition of g‐CN films on solid substrates have emerged very recently.…”

“…Traditionally,researchers have appliedthe physical vapor deposition (PVD) method to deposit amorphous CN (a-CN) films. [70,71] Techniques for the deposition of g-CN films on solid substrates have emerged very recently.T hese can be classified into two types:b ottom-up and top-down approaches. Bottomup techniques include thermalv apor condensation (TVC), [72][73][74] direct growth, [75][76][77][78] microcontactp rinting, [79] solvothermal method, [80] ande lectrodeposition.…”

Controllable Elasticity Storage and Release in CuO−Pt Core‐Shell Nanowires

“…It is worth noting that the pristine CuO−Pt NWs might be slightly bent (Figure a and 3a) similar with the CuO‐CNx core‐shell NWs, which can be neglected because the original strains are much lower than the corresponding maximum residual strain (comparing Figure a and a with Figure d and c, respectively). Additionally, the influence of e‐beam on the mechanical behaviors is also negligible because (1) for the Pt‐shell, no distinct change is observed in the Pt nanograins even under a much higher e‐beam intensity;, (2) for the CuO‐core, the e‐beam would not lead to the remarkable plastic deformation .…”