Three-dimensional Composite Electrode Research Articles

Interface coating of iron nitride on carbon cloth for reversible lithium redox in rechargeable battery

The increasing demands for high-performance energy storage devices have driven to develop advanced lithium batteries. However, the dendrite growth with potential safety issues greatly restricted the practical applications. Herein, the iron nitride (Fe2N) nanoparticles were anchored on carbon cloth to regulate the surface lithiophilic properties based on the theoretical prediction and experimental examination. Typically, the in-situ formation of highly porous Fe2N coating layer bridging between carbon cloth and lithium is able to regulate the interface properties of three-dimensional composite electrodes for reversible deposition and stripping of Li. The theoretical calculation revealed that Fe2N nanoparticles as lithiophilic sites would induce the uniform Li deposition due to the favorable electron transfer. Therefore, the composite Li electrode exhibited a good long-cycling performance of 1000 h in symmetric cells. When paired with LiNi0.5Co0.2Mn0.3O2 (NCM 523) and 3DC@I2 cathodes, the full cells delivered reversible capacities of 110 mAh g−1 for 200 cycles, and 140 mAh g−1 after 5000 cycles, respectively. This work gains the new insights into the efficient regulation of interface properties via the metal nitride coating to stabilize the lithium metal anode with enhanced reversibility.

The electrochemical performance of the N-doped graphene aerogels and nickel foam composite electrode prepared by one-pot hydrothermal method

A three-dimensional composite electrode of graphene aerogel and nickel foam was initially prepared by one-pot hydrothermal process. The electrochemical performances of such prepared electrode was investigated with cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy, and the results showed a specific capacitance of 217 F/g at 1.0 A/g, 88% specific capacitance kept as the current density is increased from 1 to 10 A/g, and 91.4% of the original capacitance maintained after cycling 5000 times in 6 mol/L KOH electrolyte at 10 A/g. These improved electrochemical performances were ascribed to the template effect of nickel foam and the chemical reduction of ethylenediamine.

Controlled self-assembly of Ni foam supported poly(ethyleneimine)/reduced graphene oxide three-dimensional composite electrodes with remarkable synergistic effects for efficient oxygen evolution

Ni foam supported PEI/RGO 3-D composite electrodes were controllably self-assembled, showing superior OER catalytic performance attributed to remarkable synergistic interactions.

Computational analysis of chemomechanical behaviors of composite electrodes in Li-ion batteries

Abstract

High capacity and cyclic performance in a three-dimensional composite electrode filled with inorganic solid electrolyte

Three-dimensional (3-D) composite electrodes are prepared by one-step sintering of the laminated LiCoO2 and 0.44LiBO2·0.56LiF pellets, in which the amorphous 0.44LiBO2·0.56LiF solid electrolyte melts during the sintering process and fills the interspaces in the underlying highly conductive 3-D frame formed by LiCoO2. The one-step sintering process yields a compact electrode structure of ∼92% in relative density, which contains no electronic conductive additives or polymer binder. For better characterization of the composite electrode, liquid electrolyte is used in the battery test, but the vast majority of the active material is in the all-solid-state environment. The specific capacity of the 3-D composite electrode is dependent on the thickness of the composite electrodes. The 100-μm-thick 3-D composite electrode possesses high specific discharge capacity of 131 mAh g−1 at C/20 rate (96% utilization of the active material), excellent cycling performance for the measured 20 cycles and good rate capability at various discharge rates. The 200-μm-thick 3-D composite electrode delivers 88% of the theoretical capacity, i.e., 120 mAh g−1, and a significantly enhanced surface capacity of ∼9 mAh cm−2, which is much higher than that of the electrode used in the conventional all-solid-state lithium battery.

Novel three-dimensional composite electrode for biofuel cell application

Novel three-dimensional composite electrode for biofuel cell application