165results about How to "Lower charge transfer resistance" patented technology

A solid electrolyte structure containing a porous solid electrolyte is prepared. At least the porous solid electrolyte of the solid electrolyte structure is immersed in a first sol solution containing at least a precursor of an electrode active material as a solute. Then, the first sol solution, in which the porous solid electrolyte is immersed, is heated. A solvent of the first sol solution is evaporated by the heating, whereby a pore of the porous solid electrolyte is filled with a high concentration (a large amount) of the electrode active material precursor.

The invention discloses a negative electrode material of a lithium ion battery. The negative electrode material comprises the following components in parts by mass: 88-105 parts of active material, 0.01-0.1 parts of single-wall carbon nanotubes, 0.01-0.5 parts of graphene nanobelt, one or less parts of super conductive carbon black, one or less parts of less-wall or multi-wall carbon nanotubes, 0.05-0.5 parts of dispersing agent, 1-3 parts of thickening agent, 1-4 parts of binder and 25-60 parts of solvent; the active material comprises a silicon oxide material SiO<x> and synthetic graphite, wherein x is greater than 0 and less than 2; and the silicon element in the negative electrode material is less than or equal to 3.5mass%. The invention provides the negative electrode material comprising the silicon oxide material and the low-dimensional carbon conductive material of the lithium ion battery; by virtue of the negative electrode material of the lithium ion battery, the problems of capacity fading and increasing internal resistance caused by losing of effective electron channels due to low electrical conductivity and an expansion effect in the use process of a silicon oxide negative electrode active material can be solved; and meanwhile, the cycle performance of the lithium ion battery applying the negative electrode material is improved.

The invention provides a treatment method for an all-vanadium redox flow battery electrode. The method comprises the following steps: with carbon electrode materials of a graphite felt, a carbon felt and the like as raw materials, drying the raw materials after fully soaking in an alkali liquor; carrying out high-temperature activation under protection of an inert gas; and washing and drying the product to prepare the activated carbon electrode materials. The treatment method has the advantages of being simple, simple and convenient to operate and low in cost; the surfaces of the treated carbon electrode materials are etched; the effective reaction area of vanadium ion electron pairs on the electrode surface is increased; the charge transfer impedance of an all-vanadium redox flow battery in a charge-discharge process is greatly reduced, so that the voltage efficiency and the energy efficiency of the all-vanadium redox flow battery under high current density are greatly improved.

The invention provides a method for in-situ construction of a surface coating layer based on a metal-organic network framework material, which promotes in-situ growth of nanoparticles on the surface of a core structure by regulating and controlling the dynamic process, namely nucleation and growth, of a metal organic network framework structure so as to achieve the purpose of constructing a uniform coating layer on the surface of a core. By adopting the method provided by the invention, a coating layer based on a metal organic network framework material can be constructed on the surface of a conventional positive electrode material, and the prepared positive electrode material can effectively inhibit the side reaction between the electrode material and an electrolyte, slow down the generation of surface SEI, reduce the surface film impedance and charge transfer impedance, and improve the reaction kinetic process of lithium ions; meanwhile, dissolution of transition metal ions can be inhibited, collapse of a lattice structure in the circulation process of the electrode material is effectively relieved, and the circulation stability and the rate capability of the positive electrode material are remarkably improved.

The invention discloses a Co<0.85>Se nanometer material serving as an electrode material of a supercapacitor and a preparation method of the Co<0.85>Se nanometer material. The nanometer material adopts a fibrous nanometer structure. The Co<0.85>Se nanometer material adopts a two-step hydrothermal synthesis method, and the two-step hydrothermal synthesis method comprises the steps of firstly, preparing a precursor Co(OH)(CO<3>)<0.5> nanowire by a hydrothermal reaction method; and secondly, carrying out selenization processing on the precursor by the hydrothermal reaction method to obtain the Co<0.85>Se nanometer material. When placed in a three-electrode system for test, the nanometer electrode material is endowed with high specific capacity of 1,249F / g under current density of 2A / g, the specific volume over 80% still can be maintained after 3,000 cycles of charging and discharging under 100mA current, and the charge transfer impedance is 0.32 ohm / cm<2>. The Co<0.85>Se nanometer electrode material prepared according to the method has the advantages of high specific capacitance, good cycle performance, simplicity in preparation method and low cost.

The invention discloses a high-activity carbon fiber felt electrode material and a preparation method and application thereof. The preparation method includes the following steps that firstly, carbon fiber felt is placed in a container containing an acetone solution after being cut for ultrasonic concussion, greasy dirt on the surface of the carbon fiber felt is removed, and the carbon fiber felt is taken out, repeatedly washed with water and dried for use; secondly, the carbon fiber felt is placed in a high-concentration potassium hydroxide aqueous solution and soaked for 2-3 hours at room temperature, and the carbon fiber felt is taken out and subjected to vacuum drying; thirdly, the obtained sample is placed in a tube furnace, protective gas is introduced, the temperature is increased to target temperature at constant speed and preserved for 2-4 hours, and then the sample is naturally cooled to room temperature; fourthly, the sample is subjected to acid pickling by means of an acid solution after being taken out, then the sample is repeatedly washed with deionized water, and then the sample is dried; fifthly, the obtained sample is subjected to secondary pore broadening treatment, the second step, the third step and the fourth step are repeated, and the high-activity carbon fiber felt electrode material is prepared. Porousness of the carbon fiber surface is achieved through the simple and feasible method, and the material can be used as a vanadium redox battery cathode material.

The embodiment of the application provides a negative electrode sheet and a lithium ion battery including the negative electrode sheet. The negative electrode sheet includes a negative current collector and a negative active material layer disposed on the negative current collector, wherein the negative active material layer includes a negative active material and a dispersant, the mass ratio of the negative active material and the dispersant is greater than or equal to 18.74, and the dispersant includes lithium carboxymethyl cellulose. The negative electrode sheet, while not losing the energydensity of the lithium ion battery, not affecting the cycle life of the lithium ion battery and not causing cyclic expansion, greatly reduces the DC resistance of the lithium ion battery and the charge transfer resistance of an interface, and avoids lithium deposition of the lithium ion battery during cyclic charge / discharge process.

The invention provides a preparation method for preparing the nano network structure electrode materials of manganese dioxide / conductive polymers applied to a super capacitor. the preparation method comprises the steps of 1, adding 1-10 g KMnO4 in 150 mL of deionized water, and stirring till the solid KMnO4 is completely dissolved in the deionized water; 2, with the ratio of the KMnO4 raw material to be 1-10 wt%, weighing a dispersant and adding the dispersant in the KMnO4 solution; 3, weighing 0.2-5 ml of conductive polymer monomers and adding the conductive polymer monomers into the KMnO4 solution with the dispersant already added therein to obtain a suspension liquid; 4, centrifugally separating the suspension liquid, and cleaning the obtained solid to obtain a solid sample; 5, freezing and drying the solid sample to obtain the manganese dioxide / conductive polymer nano-structure electrode material. Based on the preparation method, the prepared manganese dioxide / conductive polymer nano-structure electrode material is good in dispersity, large in specific surface area and good in conductivity. Meanwhile, the prepared electrode material of the super capacitor, prepared by the above method, is high in specific capacitance, high in power density, good in rate performance and the like.