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

The invention provides a positive electrode lithium supplementing method of a lithium ion battery, a product of the positive electrode lithium supplementing method and an application of the product. The positive electrode lithium supplementing method comprises the steps that a positive electrode active substance, auxiliary materials and a positive electrode lithium supplementing agent are mixed through a dry method, a mixed powder is obtained, then a lithium supplementing positive electrode pole piece is prepared, and the positive electrode lithium supplementing agent comprises Li3N. Accordingto the method, an operation process is simplified, and consumption of a side reaction between Li3N in the positive electrode lithium supplementing agent and a solvent is avoided by dry mixing so thata lithium supplementing effect is improved, the lithium supplementing positive plate with correspondingly improved porosity is obtained, and a first effect, the energy density, the cycle performanceand the rate capability of a battery cell are improved; and after lithium supplementation, byproduct nitrogen of the positive electrode lithium supplementation agent Li3N is removed by negative pressure in a formation stage so that the structure and the performance of the battery are not influenced. The positive electrode lithium supplementing method has the characteristics of low cost, simplicityand convenience in operation and a good lithium supplementing effect.

The invention provides an electrochemical synthesis method of a thiazoles compound and belongs to the technical field of thiazoles compound preparation. According to the method, in a single-chamber electrolytic tank, 2,5-thiazoline is used as a raw material, in an electrolytic solution, bromide and tetrachlorohydroquinone serve as catalysts, electrolysis is carried out on the condition without adding supporting electrolyte and additive, the reaction temperature ranges from 40 DEG C to 80 DEG C, current density ranges from 1 mA/cm2 to 5 mA/cm2, and after 3.0-4.0 F/mol of electric quantity is introduced, the 1,3-thiazole compound is obtained. According to the method, the electrochemical catalysis indirect electrolysis method easy to operate is adopted firstly to synthesize the 1,3-thiazole compound, the single-chamber electrolytic tank is used, constant-current electrolysis is adopted, a graphite flake electrode is used as a working electrode, use of chemometry oxidizing agents is avoided, atom economy is achieved beneficially, the cost is reduced greatly, operation is easy, and industrialized production is achieved beneficially.

The invention relates to a diffusion electrode alkali producing device, which mainly comprises an anode of an ion film electrolytic tank and a cathode of the ion film electrolytic tank, wherein one or more gas chambers and one or more fluid chambers are arranged at one side of the cathode of the ion film electrolytic tank; oxygen gas is conveyed to the gas chamber; an oxygen cathode diffusion electrode is arranged between the gas chamber and the liquid chamber; the oxygen gas and H2O are together converted to OH- to be transferred to the cathode fluid chamber through the effect of the oxygen cathode diffusion electrode, and further NaOH is generated in the cathode fluid chamber; and meanwhile no H2 in the cathode of the ion film electrolytic tank is separated. Because the chemical reaction of 2H2O+1/2O2 +2e=2OH- exists in the cathode of the alkali producing device, the decomposition voltage is reduced by 1.22V and estimated by a standard electric potential, and more than 56% electricity can be saved.

The invention belongs to the technical field of lithium batteries, and more specifically relates to a freeze-drying-based lithium ion battery positive electrode lithium supplementing method and a freeze-drying-based lithium ion battery positive electrode lithium supplementing product. The lithium supplement agent is dissolved in the aqueous solvent and is uniformly mixed with the positive active material to prepare slurry, the slurry is coated on the current collector, then the lithium supplement agent is cooled, crystallized and separated out into lithium supplement agent particles with small sizes through freezing, and the lithium supplement agent particles are uniformly attached to the surface of the positive active material. According to the low-temperature and low-pressure gasification drying method, a solid aqueous solvent is directly removed through sublimation, and finally, small-size lithium supplement agent crystal grains and a positive electrode active material are uniformly mixed and distributed in the final battery positive electrode material. As the crystal grains of the lithium supplement agent are refined, and the uniform dispersion of the lithium supplement agent and the positive electrode active material can be promoted, the lithium supplement method can obviously reduce the decomposition voltage of the lithium supplement agent, and finally the electrochemical performance of the battery assembled by the positive electrode material after lithium supplement is improved.

The invention relates to an ionic membrane electrolytic bath device for preparing alkali through an oxygen cathode, which mainly comprises an anode of the ionic membrane electrolytic bath and a cathode of the ionic membrane electrolytic bath, wherein a cathode gas chamber and a cathode liquid chamber are arranged on the side of the cathode of the ionic membrane electrolytic bath; and an oxygen cathode diffusion electrode (17) is arranged between the cathode gas chamber and the cathode liquid chamber and consists of a waterproof layer (24), a catalyst layer (25) and a conductive net (26) in turn. Oxygen is introduced into the cathode gas chamber (7) and is converted into OH- together with H2O to enter the cathode liquid chamber (2) under the action of the oxygen cathode diffusion electrode(17); therefore, NaOH is generated in the cathode liquid chamber (2), and H2 is not separated out of the cathode of the ionic membrane electrolytic bath. Due to a chemical reaction of 2H2O+1/2O2+2e=2OH- at the cathode of the alkali-preparing device, the decomposition voltage is reduced by 1.22V, and electricity can be saved by over 56 percent on the basis of standard potential estimation.

The invention belongs to the field of water electrolysis, and particularly relates to a composite membrane for acid-base water electrolysis as well as preparation and application thereof. The raw materials are polybenzimidazole and C3N4, wherein the mass fraction of the C3N4 is 0.1-1.5 wt.%. The preparation method comprises the steps of preparing polybenzimidazole and C3N4 nanosheets, respectivelydispersing PBI and C3N4 nanosheets in a solvent to obtain a PBI solution S1 and a C3N4 nanosheet dispersion solution S2, uniformly mixing S1 and S2, stirring to obtain a membrane casting solution S3,casting the membrane casting solution S3 on plate glass with a groove, and carrying out vacuum drying to obtain the composite membrane for acid-base water electrolysis. The composite membrane has good mechanical properties, can significantly reduce the decomposition voltage of water electrolysis and reduce energy consumption when applied to acid-base water electrolysis, and shows good battery performance.

The invention relates to an electrochemical regeneration method of chloranil by taking halogen ions as an electric catalyst, and belongs to the technical field of chloranil. The method mainly uses alkali metal halide as the electric catalyst and alcohol as a solvent, and the chloranil is regenerated by indirect electrooxidation recovery of tetrachloro hydroquinone. According to the electrochemicalmethod of the chloranil, the cost is low, the required reaction equipment is simple, the post-treatment is simple and convenient, and when a theoretical electric quantity is introduced, the yield ofthe chloranil can reach about 50%, when the electric quantity is increased by 2 times, raw materials can be basically completely reacted, and the yield is over 80%, the reaction solvent can be repeatedly recycled, no sewage is generated, green and environment-friendly effects are achieved, and the method is suitable for industrial production.

In order to overcome the problem of performance degradation of a membrane electrode caused by an antipole phenomenon existing in an existing fuel cell, the invention provides a fuel cell membrane electrode which comprises a proton exchange membrane and a catalyst layer, and the catalyst layer comprises an anode catalyst layer and a cathode catalyst layer, the anode catalyst layer and the cathode catalyst layer are respectively arranged on two sides of the proton exchange membrane, the components of the catalyst layer comprise a catalytic active component and an anti-reverse electrode material, and the anti-reverse electrode material comprises one or more of IrO2, RuO2, NiO and CoO. Meanwhile, the invention also discloses a preparation method of the fuel cell membrane electrode and a fuel cell. According to the fuel cell membrane electrode provided by the invention, the corrosion phenomenon of reverse voltage on the carbon carrier in the catalyst layer in the reverse pole process is effectively inhibited, so that the attenuation of the performance of the fuel cell is delayed, and the service life of the fuel cell is prolonged.

The invention provides a lithium supplement method of a lithium ion battery, which comprises the following steps: charging the lithium ion battery by using a first voltage to decompose a first lithium supplement material, performing first lithium supplement on the lithium ion battery, and charging the lithium ion battery by using a second voltage when the capacity of the lithium ion battery is reduced to a preset threshold value, the lithium supplement materials in the two active material layers are decomposed at different time, so that the purpose of secondary lithium supplement is achieved, the addition amount of the lithium supplement materials is improved, and the defects that in the prior art, the lithium supplement materials are too high, so that lithium precipitation of a negative electrode is easily caused, and the lithium supplement efficiency is high are overcome. And the expected effect cannot be achieved due to too few lithium supplementing materials, and the service life of the lithium ion battery is greatly prolonged.

The invention provides an electrolyte additive capable of catalyzing decomposition of a lithium supplement agent and application thereof, the electrolyte additive capable of catalyzing decomposition of the lithium supplement agent comprises crown ether, linear ether, a nitrogen-containing polydentate coordination compound and fluorobenzene, when the electrolyte additive is applied to a battery system containing the lithium supplement agent, decomposition of the lithium supplement agent can be promoted, decomposition voltage of the lithium supplement agent can be reduced, and the lithium supplement agent can be effectively prevented from being decomposed. Meanwhile, the cycling stability of the battery can be improved.