9results about How to "Increase conduction rate" patented technology

The invention provides a positive active material and a preparation method thereof, a positive plate and a battery. The positive electrode active material satisfies the following conditions: I1 + I2 + I3 < = 10.20; wherein I1 is I (111) / I (311) in an XRD (X-Ray Diffraction) pattern of the positive electrode active material, I2 is I (111) / I (400) in the XRD pattern of the positive electrode active material, I3 is I (111) / I (440) in the XRD pattern of the positive electrode active material, and I1, I2 and I3 are all not 0. According to the positive electrode active material provided by the invention, the exposure degrees of the (110) surface, the (100) surface and the (311) surface are limited by the formula 1, so that the lithium ion conduction rate can be improved, the manganese dissolution phenomenon can be reduced, and the rate capability and the cycling stability of a corresponding battery can be remarkably improved.

The invention belongs to the field of hydrogen production by alkaline electrolyzed water, and particularly relates to a double-functional-group alkaline electrolyzed water composite diaphragm as well as a preparation method and application thereof. The preparation method of the double-functional-group alkaline electrolyzed water composite diaphragm comprises the following steps: S1, mixing nano ceramic particles with a modification liquid, and performing a modification reaction to obtain amino and sulfydryl double-functional-group modified nano ceramic particles, wherein the modification liquid contains an amino silane coupling agent and a sulfydryl silane coupling agent; the polymer supporting layer is placed in sulfonation liquid to be subjected to sulfonation modification reaction, and then a sulfonated polymer supporting layer is obtained; and S3, mixing the bifunctional group modified nano ceramic particles, a polymer, a pore forming agent and a first organic solvent to obtain a membrane casting solution, degassing the membrane casting solution, coating a sulfonated polymer supporting layer with the membrane casting solution to form a membrane, and performing phase inversion in a coagulating bath to obtain the bifunctional group alkaline electrolyzed water composite membrane. The double-functional-group alkaline electrolyzed water composite diaphragm provided by the invention is good in mechanical property, stable in performance, low in surface resistance and good in air tightness.

A positive electrode active material, comprising a substrate and a coating layer, wherein the coating layer covers the substrate, the coating layer comprises a fast ion conductor layer and a carbon coating layer, and the substrate comprises one or more of the compounds shown in formula (I): LiFe 1‑a M1 a PO4 formula (I), wherein in formula (I), M1 is selected from one or more of Cu, Mn, Cr, Zn, Pb, Ca, Co, Ni, Sr, Nb and Ti, 0≤a≤0.01, the fast ion conductor layer comprises a fast ion conductor having a NASICON structure as shown in formula (II), Li 3‑b Fe 2‑b M2 b (PO4)3 formula (II), in which M2 is selected from one or more of Ti, Zr, Hf, Ge and Sn with a valence of +4, and 0≤b≤1.

In order to solve the problems that in the prior art, a positive electrode of a lithium ion battery is damaged in an overcharge environment, and cycle performance is deteriorated under a low-temperature condition, the non-aqueous electrolyte and the lithium ion battery are provided, the non-aqueous electrolyte comprises additives, an organic solvent and lithium salt, and the additives comprise bis (trimethylsilyl) lithium phosphate and heptafluorobutyrylimidazole; the non-aqueous electrolyte satisfies the following conditions: 0.5 < = A < = 3, and 0.5 < = B < = 3; wherein A% is the mass percentage content of bis (trimethylsilyl) lithium phosphate in the non-aqueous electrolyte; and B% is the mass percentage of heptafluorobutyryl imidazole in the non-aqueous electrolyte. The non-aqueous electrolyte provided by the invention meets the following conditions: when A is more than or equal to 0.5 and less than or equal to 3, and B is more than or equal to 0.5 and less than or equal to 3, the synergistic effect of bis (trimethylsilyl) lithium phosphate and heptafluorobutyrylimidazole can be effectively exerted when bis (trimethylsilyl) lithium phosphate and heptafluorobutyrylimidazole are combined, and the infiltration and overcharge resistance of the electrolyte are considered.

The invention provides a flow battery proton membrane and a preparation method thereof, and the method comprises the following steps: S1, dissolving polybenzimidazole, an inorganic substance and a dispersant in an organic solvent, and mixing to obtain a membrane casting solution; s2, casting the membrane casting solution on the surface of a flat carrier to form a membrane casting solution thin layer; and S3, carrying out phase inversion on the membrane casting liquid thin layer in a phase inversion solution to prepare the proton conduction membrane. According to the flow battery proton membrane and the preparation method thereof provided by the invention, the bottleneck problem of large internal resistance of a traditional homogeneous polybenzimidazole membrane can be obviously improved, and the proton conduction rate of the flow battery proton membrane can be substantially enhanced essentially, so that the voltage efficiency and the energy efficiency of the flow battery proton membrane are obviously improved; the efficiency and the conductivity are improved while the film forming thickness is increased, the mechanical property is also obviously improved, and the stability is guaranteed.

This invention relates to a sodium-ion battery negative electrode sheet, its preparation method, and the battery itself, belonging to the field of sodium-ion battery technology. It solves the problem that existing sodium-ion battery negative electrodes cannot simultaneously meet the requirements of high rate of charge and high energy density. The negative electrode sheet includes: a current collector, a first active layer, and a second active layer; the first active layer is disposed on at least one side of the current collector; the second active layer is disposed on the side of the first active layer away from the current collector; wherein, the ratio of the specific surface area of ​​the first negative electrode active material to the second negative electrode active material is a, the ratio of the D50 of the first negative electrode active material to the second negative electrode active material is b, the ratio of the areal density of the second active layer to the first active layer is c, and the ratio of the porosity of the first active layer to the second active layer is d, where a, b, c, and d are all greater than 1, and 3.76 < a × b + c × d < 7.42. The negative electrode sheet of this invention can significantly improve the cycle performance of the battery cell under high rate charge and discharge conditions while ensuring high energy density of the battery cell.

The application relates to a high-power water-cooled radiator for electric power equipment, which comprises a water storage tank, an air conditioner exchanger for refrigerating water in the water storage tank is arranged on the top of the water storage tank, one side of the bottom of the water storage tank is connected with a water outlet pump through a water pipe, one side of the top of the water storage tank is connected with a water inlet pump, the output end of the water outlet pump is connected with a heat exchange assembly for being arranged on a circuit board of the electric power equipment, the output end of the heat exchange assembly is connected with the input end of the water inlet pump, the length of each heat exchange column is adjusted according to the shape of a heat dissipation component of the electric power equipment, so that the heat exchange columns are matched with the heat dissipation component of the electric power equipment, the temperature in the water storage tank is kept, the overall cooling efficiency is ensured, the heat exchange assembly can keep the maximum heat conduction efficiency through the flowability and high heat conductivity of the heat conduction liquid, and the heat exchange assembly and the electric power equipment are stably clamped through a clamping plate.

The present invention discloses a preparation process of a flexible temperature-stress sensor, comprising the following steps: preparing a flexible substrate by spin coating using a PDMS solution; preparing a MXene-CNTs stress composite film; preparing a PEDOT:PSS-CNTs-graphene thermosensitive composite film; preparing a SiC film as a dielectric layer; preparing an electrode layer of an equivalent neural conductive network structure; vertically laminating a flexible substrate, an electrode layer, a stress composite film, a dielectric layer, a thermosensitive composite film, an electrode layer, and a flexible substrate in a bottom-to-top order, wherein the lead of the upper electrode layer is placed in the X-axis direction, and the lead direction of the lower electrode layer is placed in the Y-axis direction for vertical lamination, to prepare a flexible temperature-stress sensor. The flexible sensor prepared by the present invention takes into account multiple detection capabilities of temperature and stress, wherein temperature sensing is reacted by the magnitude of the thermoelectric potential, and stress sensing is reacted by the magnitude of the resistance, and the sensing mechanisms are different, which is convenient for temperature and stress decoupling, avoids signal crosstalk, and improves the accuracy of measurement.

The present invention belongs to the technical field of electrochemical energy storage materials, and discloses a polymer interface protection layer material for a high-voltage lithium battery, and its preparation and application. The preparation method is as follows: polysilsesquioxane, glycidyl ether, polyethylene glycol derivative, initiator and soluble lithium salt are mixed in an organic solvent to obtain a mixed solution; the mixed solution is heated to allow each monomer to undergo thermal polymerization to obtain a polymer interface protection layer material. The preparation method of the present invention is simple to operate and easy to promote; the polymer interface protection layer material prepared by the present invention only needs to be coated on the surface of the electrode and then dried to form a solid polymer interface protection layer on the surface of the electrode, and can be used as a positive electrode and a negative electrode interface protection layer at the same time; and the formed solid polymer interface protection layer can effectively alleviate the volume changes of the positive and negative electrodes during the charge and discharge process, release stress, thereby protecting the electrode structure from damage, and improving the cycle stability and safety performance of lithium metal batteries.