11results about How to "Uniform conductivity" patented technology

The invention discloses a transition metal nitride and amorphous carbon composite coated and modified lithium manganese iron phosphate composite material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The vanadium nitride / amorphous carbon is adopted to perform composite coating modification on the lithium manganese iron phosphate material, so that the composite positive electrode material is more stable in structure. The use of vanadium nitride reduces the coating amount of carbon, and avoids the problems of coating layer thickening caused by high carbon content and Li < + > diffusion hindering caused by reduction of tap density of active substances. Vanadium nitride not only has good conductivity, but also has good Li < + > conductivity transmission performance, Li < + > de-intercalation can be rapidly achieved, the conductivity of the material is improved, meanwhile, a Li < + > diffusion channel on the surface of the positive electrode material is further dredged and increased, and the capacity loss of the modified material is reduced.

A preparation method of a carbon black-based composite conductive agent for an automobile lithium battery belongs to the technical field of new energy automobile lithium batteries, and comprises the following steps: depositing conductive carbon black on the surface and gaps of MOF-Ni3 (HITP) 2 by adopting a vapor deposition method to obtain MOF-Ni3 (HITP) 2 loaded carbon black, and then carrying out surface modification on the MOF-Ni3 (HITP) 2 loaded carbon black by adopting a spraying agent to obtain the carbon black-based composite conductive agent for the automobile lithium battery. The carbon black-based composite conductive agent is obtained. The spraying agent is prepared from water, polyvinyl alcohol, waterborne polyurethane, behenamidopropyl dimethylamine and fatty alcohol-polyoxyethylene ether. The carbon black-based composite conductive agent prepared by the invention can greatly improve the dispersibility of the conductive agent, improve the conductivity and the conductive stability in long-term use, has very good high-rate charge-discharge efficiency, and improves the rate capability of a lithium iron phosphate battery.

The invention discloses a preparation method of a standardized sheet for a thermoelectric test of minerals or mineral materials and alloys, belongs to the technical field of mineralogy, material science and prospecting prediction, and establishes a preparation process of a universal mineral or mineral material and alloy thermoelectric sheet. Covering all semiconductor mineral types or mineral material types such as pyrite, magnetite, graphite and sintered ore; accurate thickness control is achieved through a double-face polishing-loading sheet supporting structure, in-situ testing of the thermoelectricity of minerals or mineral materials and alloys is achieved, and the testing precision is improved; by adopting a conductive adhesive-copper plate composite structure, the interface resistance is reduced, the supporting strength is met, and the requirement of eliminating detection interference is met; residual colloid is thoroughly removed through ultrasonic cleaning, and the insulation effect is avoided; according to the standardized sheet, the hollow aminated phenolic resin nanosphere is used as a conductive substrate and is used for bonding a sample and a copper plate, the contact resistance between the sample and an electrode can be greatly reduced, and the accuracy of test data is improved.

The invention discloses transition metal oxide / polymer gel and a preparation method thereof, a negative active material, a negative pole piece and a lithium ion battery, and belongs to the technical field of lithium ion batteries. The preparation method comprises the following steps: adding a transition metal oxide into a conductive polymer monomer-phytic acid aqueous solution, uniformly dispersing, adding an ammonium persulfate aqueous solution, and carrying out ice-bath ultrasonic treatment to obtain the gel, the molar ratio of the transition metal oxide to the conductive polymer monomer is (0.38-0.63): (0.05-1.2); and / or the molar ratio of the conductive polymer monomer to the phytic acid is (0.05-1.2): (0.03-0.5). The gel is composed of the transition metal oxide coated with the conductive polymer gel layer, use of solvents and the like is avoided, the cost is reduced, oxide particles are connected through a three-dimensional porous network of the conductive polymer gel, rapid transmission of electrons and ions is facilitated, and the conductivity of the conductive polymer gel is improved. Meanwhile, stress generated by volume expansion / shrinkage of the transition metal oxide during charging and discharging is effectively buffered, and the specific capacity, the cycling stability and the rate capability of the battery are improved.

The present invention pertains to a negative electrode for a lithium secondary battery, a method for manufacturing same, and a lithium secondary battery including same. More specifically, the negative electrode for a lithium secondary battery according to the present invention has a protective layer containing a three-dimensional structure composed of metal and lithium nitride, and thus uniform ionic conductivity and electrical conductivity can be induced on the surface of the negative electrode.

The embodiment of the invention provides a pantograph slide plate manufacturing method which comprises the following steps: S1, mixing a high-purity carbon material, asphalt, copper powder and titanium carbide, and then adding a binder to form a five-component mixture; wherein the titanium carbide is used as a doping agent; s2, pressing and pre-shaping the five-component mixture, and then performing prefabricated graphitization sintering to obtain the pantograph carbon-based electric contact material, and S3, the surface of the pantograph carbon-based electric contact material obtained through graphitization sintering treatment is subjected to treatment and conformal processing to form a carbon strip, the carbon strip is embedded into the titanium pantograph type, and the titanium lightweight high-speed rail pantograph slide plate is obtained. According to the embodiment of the invention, the technical problem of non-uniform guiding performance of the pantograph slide plate manufactured by a traditional manufacturing method of the pantograph slide plate is solved.

The invention relates to the technical field of batteries, in particular to a preparation method of safe slurry, which comprises the following steps: S1, primary pre-dispersion of a mixed ceramic material and a solvent, S2, secondary pre-dispersion after addition of a dispersant, S3, stirring dispersion after third pre-dispersion after addition of a conductive agent, S4, fourth pre-dispersion and stirring dispersion after addition of a binder, and S5, secondary pre-dispersion after addition of a binder. S5, stirring and dispersing after adding a dispersing agent, and S6, slowly stirring and dispersing and reversely defoaming, and finally slowly stirring and discharging to obtain the safe slurry. According to the preparation method disclosed by the invention, aggregate of particles can be more effectively broken through multiple pre-dispersion and stirring dispersion, interaction force among the particles is reduced, so that relatively uniform particle distribution is obtained, proper viscosity of a mixed solution can be ensured through fractional addition of the dispersing agent, and the mixed solution has a relatively good dispersion effect during stirring. In addition, the invention also discloses a safe slurry and a safe coating structure for a battery.

The utility model belongs to the energy -conserving and carbon -reducing electrolytic aluminium anode technical field, especially relates to a current -sharing composite electrolytic aluminium anode structure, and anode structure includes aluminium alloy guide rod, is located aluminium alloy guide rod bottom and its fixed connection's section is the composite transition structure of convex, and the composite transition structure is fixedly connected with carbon top through the graphene / copper composite expansion connecting column of its bottom, the utility model discloses the addition of graphene / copper composite board has reduced the interface resistance between expansion connecting structure and carbon, and when anode is installed on electrolytic cell, anode overall temperature rises, graphene / copper composite expansion connecting structure is heated, produces the thermal expansion outward, and the contact resistance with carbon is also smaller.

A method for preparing a carbon black-based composite conductive agent for automotive lithium batteries, belonging to the technical field of new energy automotive lithium batteries, the preparation method of the present invention uses a vapor deposition method to deposit conductive carbon black on the surface and voids of MOF-Ni3(HITP)2 to obtain MOF-Ni3(HITP)2-loaded carbon black, and then uses a spray to perform surface modification on the MOF-Ni3(HITP)2-loaded carbon black to obtain a carbon black-based composite conductive agent. The spray contains water, polyvinyl alcohol, water-based polyurethane, behenamide propyl dimethylamine and fatty alcohol polyoxyethylene ether. The carbon black-based composite conductive agent prepared by the present invention can greatly improve the dispersibility of the conductive agent, improve the conductivity and long-term conductive stability, has good high-rate charge and discharge efficiency, and improves the rate performance of lithium iron phosphate batteries.

A silk-screen printing device for manufacturing a flexible sensor comprises a printing table, a silk screen and a scraper. The printing table comprises a low end, a high end, a right side plate and a left side plate, a right silk screen hole and a right material hole are formed in the right side plate, a left silk screen hole and a left material hole are formed in the left side plate, a silk screen groove is formed between the left silk screen hole and the right silk screen hole, a silk screen is inserted into the silk screen groove, and the top of the silk screen is connected with the scraper. And the slurry is tightly accumulated at the bottom of the scraper under the action of gravity and falls down along the silk screen under the action of gravity, so that the slurry can be uniformly distributed on the flexible material, the uniform slurry can generate a uniform conductive layer, and the silk-screen printing effect is relatively good. Therefore, according to the design, the slurry can be evenly distributed on the flexible material, and the screen printing effect is good.

The present invention belongs to the field of electrochemical energy storage technology, and specifically relates to a lithium ion hybrid supercapacitor with matched positive and negative electrodes and a preparation method thereof. The lithium ion hybrid supercapacitor prepared in the present invention uses a high-capacity capacitor-battery hybrid positive electrode material (carbon aerogel-manganese iron phosphate lithium composite positive electrode material) and a high-rate, long-cycle-life battery-type negative electrode material (phosphorus-carbon composite negative electrode material) as the positive and negative electrode materials of the lithium ion hybrid supercapacitor, which is conducive to achieving the maximum degree of positive and negative electrode matching. The lithium ion hybrid supercapacitor assembled therefrom has both high energy density, high power density and excellent cycle stability.