32results about How to "Reduce decomposition voltage" patented technology

The application provides a method for replenishing lithium for a lithium-ion battery, including charging the lithium-ion battery with a first voltage, causing the first lithium-replenishing material to decompose, and replenishing the lithium-ion battery for the first time. When the capacity of the lithium-ion battery drops to the preset threshold, the lithium-ion battery is charged with the second voltage, so that the second lithium-supplementing material decomposes, and the lithium-ion battery is supplemented with lithium for the second time, so that the supplementary lithium in the two active material layers Lithium materials are decomposed at different timings to achieve the purpose of secondary lithium supplementation, which not only increases the amount of lithium supplementation materials added, but also overcomes the lithium deposition at the negative electrode that is easily caused by excessive lithium supplementation materials in the prior art, while excessive lithium supplementation materials The problem of being less and unable to achieve the expected effect greatly prolongs the service life of the lithium-ion battery.

The invention discloses a method for synthesizing C-3 alkyl substituted quinoxalinone catalyzed by nickel under electrochemical conditions, and belongs to the technical field of compound preparation. In the method, 2-hydroxyquinoxaline and N-hydroxyphthalimide ester are used as raw materials in a single-chamber electrolytic cell, in an electrolyte, nickel chloride hexahydrate is used as a catalyst, and 4,4' -Di-tert-butyl-2,2'-dipyridine as ligand, electrolyzed under the condition of lithium perchlorate as supporting electrolyte, the reaction temperature is 60℃, and the current density is 8mA / cm 2 , the reaction 3h can obtain C-3 substituted alkylated quinoxalinone compounds with different structures. The method is mild in reaction, uses cheap and readily available nickel metal catalysts, and has good functional group compatibility. In addition, this electrochemical method provides a green and efficient method for the synthesis of various alkyl-substituted quinoxalinone compounds, which contributes to atom economy, greatly reduces the cost and makes the operation simpler. It is more conducive to the realization of industrialized production.

The invention relates to an electrochemical catalyzed synthesis method for an acyl substituted electron-deficient nitrogen-containing heterocyclic compound, and belongs to the technical field of acyls nitrogen-containing aromatic heterocyclic compounds. The method comprises the following steps: taking alpha-ketonic acid and an electron-deficient nitrogen-containing heterocyclic compound as raw materials in an electrolytic cell; taking halide ions as an electrocatalyst in electrolyte; carrying out electrolysis in the presence of additives, wherein the reaction temperature is 25-70 DEG C, and the current density is 1-5 mA / cm<2>; and consuming 2.0-3.5 F / mol of quantity of electric charge to obtain an acyls nitrogen-containing aromatic heterocyclic compound. According to the method, the acyls nitrogen-containing aromatic heterocyclic compound is synthesized by an electrochemical catalyzed indirect electrolyzing method which is simple to operate for the first time, use of expensive metal compounds such as silver nitrate and peroxide such as stoichiometric (NH4)2S2O8 is avoided, therefore, the atom economy can be realized, the cost is greatly reduced, operation is simplified, and the acyls nitrogen-containing aromatic heterocyclic compound is suitable for being produced industrially.

The invention provides an electrolyte solution additive with catalytic decomposition of lithium-replenishing agent and application thereof. The electrolyte additive with catalytic decomposition of lithium-replenishing agent includes crown ether, linear ether, nitrogen-containing multidentate complex and fluorobenzene. In a battery system containing a lithium supplement, the decomposition of the lithium supplement can be promoted, the decomposition voltage of the lithium supplement can be reduced, and the cycle stability of the battery can be improved.

The invention relates to an electrochemical preparation method of aziridine compounds. The method is to use N-aminophthalimide and styrene or cycloolefin as raw materials in a single-chamber electrolytic cell, and in the electrolyte, use tetraalkylamine halides or alkali metal halides as electrocatalysts, Using lithium perchlorate or triethylamine / acetic acid as a supporting electrolyte, electrolyze in the presence of alkali, the reaction temperature is 0-40°C, the current density is 4-12mA / cm2, and nitrogen is obtained after passing through 2.5-3.5F / mol of electricity Cyclopropane compounds. The method of the present invention first adopts the indirect electrolysis method of electrochemical catalysis, which is simple to operate, to synthesize aziridine compounds, and uses a single-chamber electrolytic cell, adopts constant current electrolysis and uses a glassy carbon electrode as a working electrode, and realizes a double-chamber electrolysis At the same time, the working electrode is changed from the expensive platinum electrode to the glassy carbon electrode, which greatly reduces the cost, simplifies the operation, and is more suitable for industrial production.

The invention relates to a fuel battery unit with an electric field-membrane electrode combined structure and a reversible regenerable oxyhydrogen electrolysis unit thereof. The fuel battery unit has the structure that electrolyte is arranged between an anode and a cathode. The fuel battery unit is characterized in that an electric field anode insulated with the anode is arranged outside the anode; an electric field cathode insulated with the cathode is arranged outside the cathode; and the electric field anode and the electric field cathode are connected with a DC power supply. The fuel battery unit with the electric field-membrane electrode combined structure can effectively reduce the activation loss, the penetration of the fuel, the internal short-circuit current and the ohm loss, improves the performance of the fuel battery unit and overcomes the defect that prior fuel battery units cannot reduce the activation loss. The application of the fuel battery unit with the electric field-membrane electrode combined structure in the reversible regenerable oxyhydrogen electrolysis unit can also reduce the activation loss and improve the electrolysis efficiency.

The invention relates to a method and equipment for continuous preparation of high-purity titanium by oxide melting electrolysis-vacuum rectification, belonging to the fields of electrochemical metallurgy and vacuum metallurgy. The process steps are as follows: add metal or alloy cathode and titanium-containing oxide slag electrolyte in the electrolytic furnace, use inert electrode or graphite as the anode; perform electrolysis under high temperature conditions, and send the titanium-containing alloy obtained by electrolysis into the rectification furnace for rectification , Separation of titanium and metal or alloy cathode; making the metal or alloy cathode return to the electrolytic furnace through evaporation to realize circulation. The entire operation process realizes the continuous preparation of high-purity titanium by controlling the rectification furnace and electrolytic furnace to realize oxide melting electrolysis-vacuum rectification. The invention meets the requirements of green metallurgy, utilizes the principles of electrochemical metallurgy and vacuum metallurgy, continuously and comprehensively recovers metallurgical secondary resources, and has the advantages of low energy consumption, simple operation, short process and the like.

The invention discloses a method for preparing a manganese dioxide / carbon microsphere electrode by an organic matter electrolytic process. The method comprises the following steps: with inert electrodes as a cathode and an anode, and a water solution containing an organic reagent and manganate as an electrolyte, carrying out an electrolysis in a constant-voltage manner, wherein the voltage is 1V to 300V and the control temperature is 25-90 DEG C; and washing the product obtained from the cathode with deionized water after electrolysis is ended, and then drying the product to obtain the manganese dioxide / carbon microsphere electrode. In the water solution containing the organic reagent and the manganate, the concentration of manganese ions is 0.001-0.01mol / L; the volume concentration of the organic reagent is 0.05-0.5; and the organic reagent is one or a mixture of more than two of n-methyl pyrrolidone, methanol, ethanol or acetone. According to the method disclosed by the invention, catalytic action of Mn ions is adopted in a preparation process, so that decomposition voltage of an organic matter is reduced; the method has the effects of safety and low energy consumption; the deposition rate of the material is effectively improved; and the production efficiency is improved.

In order to solve the problems of capacity loss of the existing lithium ion secondary battery in the SEI film forming process and harsh operation requirements and poor lithium supplementing effect of the existing lithium supplementing mode, the invention provides a lithium ion battery positive electrode sheet, which comprises a first current collector, a lithium supplementing layer and a positive electrode active layer, wherein the lithium supplementing layer is positioned between the positive electrode active layer and the first current collector; the lithium supplementing layer also comprises reducing lithium compounds; the reducing lithium compounds comprise one or more of L-lithium ascorbate, D-lithium erythorbate, lithium pyrosulfite, lithium sulfite and lithium phytate. Meanwhile, the invention also discloses a preparation method of the positive electrode sheet and a lithium ion battery using the positive electrode sheet. By using the technical scheme, the lithium loss of the positive electrode active layer in the first charging and discharging process can be reduced; the energy density of the battery is increased.

The invention relates to a synthetic method of a medium-ring lactam compound. The synthetic method comprises the following step that an amide compound with the structure shown in the formula (I) is electrolyzed to obtain the medium-ring lactam compound with the structure shown in the formula (II). The lactam compound can be directly electrolyzed through an electrochemical method, so that the medium-ring lactam compound can be obtained. Application of a transition metal catalyst and a stoichiometric oxidizing agent is avoided, generation of chemical waste is avoided, and the atom economy is facilitated. The method is simple to operate, the product purity is high, purification is easy, the efficiency and yield are high, and the production cost is low; besides, reaction conditions are mild, inert gas protection is not needed, a reaction system is greener, environmentally friendly, safe, economical, capable of saving energy and protecting the environment, and more beneficial to industrial production.