Investigation of the Supercapacitor Performance of NiCoAl(OH)₂ from the Co-Precipitation Method.

Herein, NiCoAl(OH)₂ materials, a by-product in the preparation of the precursor of cathode materials for lithium ion batteries, were employed as supercapacitor electrodes. The reaction time was changed from 2 to 48 h to produce hydroxide products, which were analyzed using physical and electrochemical methods. The hydroxide material reacted for 2 h exhibited a good average particle strength of 34.

Fabrication of β-CoVO nanorods embedded in graphene sheets and their application for electrochemical charge storage electrode.

The fabrication of β-CoVO nanorods embedded in graphene sheets and their application as electrochemical charge storage electrodes is reported. From the surfactant treatment of raw graphite, graphene was directly prepared and its nanocomposite with β-CoVO nanorods distributed between graphene layers (β-CoVO-G) was synthesized by a hydrothermal method. When applied as an anode in lithium-ion batteries, the β-CoVO-G anode exhibits greatly improved charge and discharge capacities of 790 and 627 mAh · g, respectively, with unexpectedly high initial efficiency of 82%.

Direct Synthesis of Carbon Sheathed Tungsten Oxide Nanoparticles via Self-Assembly Route for High Performance Electrochemical Charge Storage Electrode.

Using a stabilizing agent-assisted co-assembly method, a novel nanocomposite of mesoporous carbon embedded with uniform tungsten oxide nanorods is obtained, which is converted into carbon-sheathed tungsten oxide nanoparticles by delicate calcination and further reduction. Through optimization of tungsten content, it is found that highly crystalline tungsten oxide nanoparticles are uniformly coated with an ultra-thin carbon layer. When applied into electrochemical charge-storage electrodes for supercapacitor and lithium-ion battery, an excellent average capacitance (129 F g−1, above 400 F cm−3), higher rate performance and significantly advanced cycle stability are observed.