摘要:
The present invention provides a method for the preparation of printable electrodes, suitable for use in supercapacitors, and in particular for the application of an electrode composition to heat-sensitive substrates. The method of the invention incudes providing a substantially flat substrate; providing a flowable electrode composition comprising an aqueous electrolyte and a dry matter, wherein the dry matter content (DMC) of the flowable electrode composition ranges from about 25% to about 65% (w/w); placing a thin screen or a stencil having at least one opening over a top surface of the flat substrate; contacting a top surface of the screen or stencil with the flowable composition; removing the thin screen or stencil from the top surface of the substrate; and blotting the substrate and the electrode composition applied thereon under pressure of between about 5 to about 150 bar, thereby obtaining a printed electrode having a DMC of between about 30% (w/w) to about 75% (w/w). The invention further provides printed electrodes, which can be prepared in a highly reproducible manner by the method of the invention.
摘要:
Provided is a method of producing graphene-based supercapacitor electrode from a supply of coke or coal powder. The method comprises: (a) dispersing particles of the coke or coal powder in a liquid medium containing therein an optional surfactant or dispersing agent to produce a suspension or slurry, wherein the coke or coal powder is selected from petroleum coke, coal-derived coke, meso-phase coke, synthetic coke, leonardite, anthracite, lignite coal, bituminous coal, or natural coal mineral powder, or a combination thereof; (b) exposing the suspension or slurry to ultrasonication at an energy level for a sufficient length of time to produce a graphene suspension having isolated graphene sheets dispersed in the liquid medium; and (c) shaping and drying the graphene suspension into the supercapacitor electrode in a film, filament, rod, or tube form that is porous and has a specific surface area greater than 200 m 2 /g.
摘要:
This invention describes the novel principles of physical activation of initially porous carbon materials. More particularly, it describes the gas-phase activation of microporous carbon materials. A method is characterised by steps of selecting nanoporous carbon material with predetermined surface area and pore size, and activation of selected nanoporous carbon by heating and interacting carbon with water vapour at the temperature range from 500 º C to 900 ºC.
摘要翻译:本发明描述了初始多孔碳材料的物理活化的新原理。 更具体地说,它描述了微孔碳材料的气相活化。 一种方法的特征在于以下步骤:选择具有预定表面积和孔径的纳米多孔碳材料,以及通过加热和使碳与水蒸气在500℃的温度范围内相互作用来活化选定的纳米多孔碳; C to 900º C。 p>
摘要:
An energy storage device can include a cathode, an anode, and a separator between the cathode and the anode, where the anode can have a desired lithium pre-doping level to facilitate desired capacitor performance. Controlled anode pre-doping can include printing lithium powder or a mixture including lithium powder onto a surface of the anode. Controlled anode pre-doping can include electrochemically incorporating lithium ions into the anode. A duration of the pre-doping process can be selected such that desired anode pre- doping is achieved.
摘要:
A method of making a multilayer structure is provided, comprising providing a substrate; providing a coating composition, comprising: a liquid carrier and a MX/graphitic carbon precursor material having a formula (I); disposing the coating composition on the substrate to form a composite; optionally, baking the composite; annealing the composite under a forming gas atmosphere; whereby the composite is converted into an MX layer and a graphitic carbon layer disposed on the substrate providing the multilayer structure; wherein the MX layer is interposed between the substrate and the graphitic carbon layer in the multilayer structure.
摘要:
The present invention is related with a method for making a high-density carbon material for high-density carbon electrodes by wet process free of organic solvents comprising the steps of pre-compaction of carbon/polymer composite in wet process, making a dry precursor from pre-compacted carbon/polymer composite in the form of slurry by evaporating aqueous solution from said carbon-polymer composite slurry and milling in non-destructive way a blended dry precursor thereafter into a carbon-polymer composite granulated powder and thereafter forming a carbon-polymer composite film from said carbon-polymer composite granulated powder.
摘要:
Doped activated microwave expanded graphite oxide materials and doped monolayer graphene materials, and methods of making these materials. The materials exhibit increased capacitance relative to undoped activated microwave expanded graphite oxide and monolayer graphene. The materials are suitable for use in, for example, ultracapacitors.