18results about How to "Reduce DC internal resistance" patented technology

The invention provides a semi-solid-state battery electrolyte precursor, a semi-solid-state battery electrolyte, a semi-solid-state battery and a preparation method of the semi-solid-state battery. The electrolyte precursor comprises a first polymer monomer, a second polymer monomer and an initiator, the first polymer monomer is an acrylic monomer or an acrylate monomer; the second polymer monomer is a fluorine-containing unsaturated monomer. According to the semi-solid battery electrolyte precursor, the first polymer monomer with the acrylic acid or acrylate structure and the second polymer monomer with the fluorine-containing unsaturated structure are selected, the formed copolymer can improve the stability of an electrode / electrolyte interface, and even if monomer residues exist, the stability of the electrode / electrolyte interface can be improved. And an SEI film with good stability can also be formed in a subsequent film forming stage, and an electrode / electrolyte interface is optimized.

The present invention relates to the technical field of lithium ion batteries, and provides a lithium ion secondary battery, the electrolyte of the lithium ion secondary battery comprises a carboxylic ester solvent and an electrolyte lithium salt, the mass percentage content of the carboxylic ester solvent is A, the mass percentage content of the lithium bis (fluorosulfonyl) imide is B, and the mass percentage content of the lithium bis (fluorosulfonyl) imide is A; the thickness of the first adhesive layer close to one side of the positive plate in the diaphragm is C [mu] m, the thickness of the second adhesive layer close to one side of the negative plate is D [mu] m, and A, B, C and D meet the relational expression that (D-C) / (A + B) is more than or equal to 0.006 and less than or equal to 0.08. The lithium ion secondary battery can effectively solve the problem that lithium ion transmission is blocked after holes are blocked by the diaphragm adhesive layer, the transmission speed of lithium ions in the lithium battery is improved, the direct-current internal resistance of the battery is reduced, the cycle performance of the lithium battery at low temperature is improved, and the overcharge safety performance of the battery is improved.

The invention provides a preparation method and application of a lithium ion battery negative electrode plate, the lithium ion battery negative electrode plate comprises a negative electrode current collector, the surface of the negative electrode current collector comprises a first active material layer and a second coating layer, the first active material layer is prepared by a magnetron sputtering method, and the second coating layer is prepared by a magnetron sputtering method. The second coating layer is coated on the first active substance layer, the first active substance layer comprises a silicon-based thin film prepared by vacuum magnetron sputtering, and the second coating layer comprises a graphite active substance, a conductive agent, a dispersing agent and a binder. The internal aperture structure of the negative plate inhibits the expansion of the silicon-based material and improves the cycle stability of the battery.

The invention relates to the technical field of batteries, in particular to a battery cell and a battery. The battery cell comprises a battery cell inner layer area and a battery cell outer layer area from the center to the edge of the battery cell; positive plates of the battery cell comprise a first positive plate and a second positive plate, the first positive plate is arranged in an inner layer area of the battery cell, and the second positive plate is arranged in an outer layer area of the battery cell; the first active material layer of the first positive plate comprises a first binder; a second active material layer of the second positive plate comprises a second binder; the swelling ratio of the first binder is greater than that of the second binder; the adhesive force between the first positive plate and the diaphragm is recorded as A1, the adhesive force between the second positive plate and the diaphragm is recorded as A2, and A1 and A2 meet the following relational expression:-1 < = A1-A2 < = 4. The positive plate active material layers corresponding to the inner layer area and the outer layer area in the battery cell adopt different binders, so that the bonding effect of the positive plate and the diaphragm in the whole cell package, the electrolyte wettability and the production efficiency can be balanced.

The invention discloses a solid electrolyte coating diaphragm, a preparation method thereof and a lithium ion battery, and belongs to the technical field of lithium ion batteries. The preparation method provided by the invention comprises the following steps: uniformly dispersing LLZTO in a polyacrylonitrile solution, and drying to obtain LLZTO particles coated with polyacrylonitrile; wherein the mass ratio of the LLZTO to the polyacrylonitrile is (15-25): 1; the polyacrylonitrile-coated LLZTO particles, Si3N4 and a binder are mixed in water according to the mass ratio of (5-7): (2-4): 1, then at least one face of a base membrane is coated with the mixture, drying is conducted, and the solid electrolyte coated diaphragm is obtained and has high heat resistance, high needling strength and good ionic conductivity; the battery assembled by using the composite material has relatively low direct current internal resistance (DCR) and long cycle service life, and the preparation method is very simple and suitable for large-scale production.

The application discloses a negative pole piece and a lithium ion battery, and relates to the technical field of batteries, and specifically discloses a negative pole piece and a lithium ion battery. The negative pole piece comprises a current collector, a first coating layer and a second coating layer which are stacked on at least one side of the current collector; the first coating layer and the second coating layer each comprise a negative active material, a first binder, a second binder, a first conductive agent and a second conductive agent; and the preparation of the negative pole piece satisfies the following conditions: 2≤C2 / C1≤4 and 1.05≤X / Y≤1.25, wherein C1 and C2 are the mass proportions of the first conductive agent in the first coating layer and the second coating layer respectively, and X and Y are the solid contents of the first coating layer slurry and the second coating layer slurry respectively. According to the application, the solid content of the slurry, the proportions of different active materials and conductive agents are designed and controlled in the double-coating pole piece, and the designed proportions satisfy a certain functional relationship, so that the ion conductivity of the battery can be effectively improved while the high conductivity of the pole piece is maintained, the direct-current internal resistance of the pole piece in the charging and discharging process is reduced, the rate charging and discharging performance is improved, and the lithium precipitation window is widened.

An electrochemical device and an electronic device. The electrochemical device includes a positive electrode, the positive electrode includes a current collector and a positive electrode active material layer, the positive electrode active material layer is located on at least one surface of the current collector, and includes a first positive electrode active material layer and a second positive electrode active material layer. The first positive electrode active material layer is located between the current collector and the second positive electrode active material layer, wherein the bonding force between the current collector and the first positive electrode active material layer is F1N / m, the cohesive force of the second positive electrode active material layer is F2N / m, and the positive electrode satisfies: F1 / F2≥6. Applying the above-mentioned positive electrode to the electrochemical device can not only enhance the safety performance of the electrochemical device, but also fully suppress the DC internal resistance of the electrochemical device under high voltage and high temperature and improve its cycle performance.

The application provides a modified conductive carbon, a slurry, a positive electrode, a battery and a preparation method thereof, the modified conductive carbon, wherein 0.05wt%-0.1wt% of F elements are doped. Compared with unmodified conductive carbon, the modified conductive carbon has an open pore structure. The modified conductive carbon is prepared by fluorination treatment of graphene oxide with sodium 2,2,3,3-tetrafluoropropionate as a fluorine source and phosphoric acid immersion treatment. The application improves the problem of water introduction in the positive electrode slurry, can stabilize the viscosity of the positive electrode slurry in air, and improves the electrical properties such as the resistance, charge and discharge life of the battery, and improves the chemical stability of the positive electrode slurry of the sodium ion battery in air.

The embodiment of the utility model provides a diaphragm, an electrode assembly, a battery and electric equipment. The diaphragm comprises a structural layer, the structural layer comprises a base membrane and a solid electrolyte layer, and the solid electrolyte layer is arranged on at least one side of the base membrane. The number of the bonding layers is two, the two bonding layers are arranged on the two sides of the structural layer respectively, each bonding layer comprises a plurality of cold-pressing micelles, and the cold-pressing micelles are distributed in a dot matrix mode. The arrangement of the solid electrolyte layer and the cold-pressed micelles in dot matrix distribution eliminates the impedance influence of the cold-pressed glue on the diaphragm, so that the direct-current internal resistance of the battery adopting the diaphragm is reduced, and the production and processing cost of the battery adopting the diaphragm is reduced at the same time.

The invention relates to an electrochemical device and an electronic device comprising the same. The electrochemical device comprises a positive electrode, a negative electrode and an electrolyte, the positive electrode comprises a positive electrode current collector and a positive electrode active material layer located on the positive electrode current collector, the positive electrode active material layer comprises a positive electrode active material, based on the mass of the positive electrode active material layer, the mass percentage of the positive electrode active material is M%, the value range of M is 95-99, the cracking width of the surface of the positive electrode active material layer is W mm, and M and W meet the condition that M / W is larger than or equal to 47.5. The electrochemical device provided by the invention has reduced DC internal resistance and improved capacity retention rate, low temperature performance and floating charge performance.

The present application relates to an electrochemical device and an electronic device comprising the same. The electrochemical device of the present application comprises: a positive electrode, a negative electrode and an electrolyte, the positive electrode comprising a positive electrode current collector and a positive electrode active material layer on the positive electrode current collector, the positive electrode active material layer comprising a positive electrode active material, wherein the mass percentage of the positive electrode active material is M% based on the mass of the positive electrode active material layer, M ranges from 95 to 99, and the cracking width of the surface of the positive electrode active material layer is W mm, wherein M and W satisfy: M / W≥47.5. The electrochemical device provided by the present application has reduced direct current internal resistance and improved capacity retention rate, low temperature performance and floating performance.

The application provides a battery cell, which comprises a positive electrode sheet, a separator and a negative electrode sheet; the positive electrode sheet comprises a positive electrode current collector and a positive electrode active material layer; the positive electrode active material layer comprises a positive electrode active material, the positive electrode active material comprises lithium cobaltate, the particle size of the lithium cobaltate is d1, the unit is mu m, and the value range of d1 is 0 mu m < d1 <= 2 mu m; the negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer coated on the surface of the negative electrode current collector; the thickness of the negative electrode current collector is 7 mu m-11 mu m; the negative electrode active material layer comprises a second binder, and the second binder comprises a CMC compound; by introducing lithium cobaltate particles with a particle size of 0-2 mu m into the positive electrode sheet, adopting a negative electrode current collector with a thickness of 7 mu m-11 mu m, and simultaneously adopting a CMC compound in the negative electrode active material layer, the direct current resistance of the battery can be small, the heat generation in the cycle process can be reduced, the by-products caused by temperature rise can be relatively reduced, and the long cycle performance of the battery cell can be ensured.

The invention provides modified conductive carbon, slurry, a positive electrode, a battery and a preparation method of the modified conductive carbon, and the modified conductive carbon is doped with 0.05 wt%-0.1 wt% of an F element. Compared with unmodified conductive carbon, the modified conductive carbon has an open pore structure. The modified conductive carbon is prepared by using 2, 2, 3, 3-tetrafluoropropionate sodium as a fluorine source to carry out fluorination treatment on graphene oxide and carrying out phosphoric acid soaking treatment. The problem of water introduction in the positive electrode slurry is improved, the viscosity of the positive electrode slurry in air can be stabilized, the electrical properties such as resistance and charge-discharge life of the battery are improved, and the chemical stability of the positive electrode slurry of the sodium-ion battery in air is improved.

The invention discloses a secondary battery and an electric device, and belongs to the technical field of secondary batteries. The secondary battery comprises a positive plate, a negative plate, a diaphragm and an electrolyte, the positive plate comprises a positive material layer, the positive material layer comprises a positive material, the positive material comprises a layered transition metal oxide, and the electrolyte comprises a cyclic sulfate compound. According to the present invention, by comprehensively regulating and controlling the unit cell volume a3 of the positive electrode material when the secondary battery is charged to 90% SOC, the amount of Fe < 3 + > produced by the reaction of the positive plate and ferrocene (represented by the concentration bmmol / L of Fe < 3 + > in the solution after the reaction), and the tortuosity c of the positive plate, the a * c / b is within the suitable range, such that the interface activity of the positive electrode material can be reduced, the stability of the positive electrode material can be improved, and the battery performance can be further improved. Gas produced in the battery is reduced, and the safety of the battery is improved; the transmission path of lithium ions can be shortened, and the direct-current internal resistance of the battery is reduced.

The embodiment of the invention provides a biomass charcoal negative electrode material modification method and system, and the method comprises the steps: pretreating a biomass raw material for removing impurities and controlling the particle size; pyrolyzing and carbonizing the pretreated biomass raw material to obtain biomass powder, heating to a carbonization temperature at a controllable heating rate under the protection of inert gas, and preserving heat to form primary biochar; mixing the primary biochar with an activator, and performing chemical activation treatment at an activation temperature to regulate and control a pore structure and surface properties and generate an activated product; neutralizing the activated product by using an acid solution and dissolving residual alkaline substances for post-treatment of the activated product; and mixing and drying an anchoring agent and the post-treated activation product to obtain the modified biomass charcoal negative electrode material, and the anchoring agent is selected from a lithium polysulfide compound and is used for anchoring transition metal ions in an electrolyte. According to the invention, the negative electrode interface is protected from being damaged by transition metal ions in electrochemical energy storage.

The utility model discloses a battery, a battery pack and electric equipment. The battery comprises a first shell and a liquid supplementing mechanism, the first shell is provided with a first accommodating cavity, and the first accommodating cavity can accommodate an electrolyte and a film-forming agent; the liquid supplementing mechanism comprises a second shell and a liquid outlet valve, the second shell is fixedly connected with the first shell, the second shell is provided with a second containing cavity, the second containing cavity can contain the film forming agent, the second containing cavity is communicated with the first containing cavity through a liquid outlet hole, and the liquid outlet hole is blocked by the liquid outlet valve; and the liquid outlet valve can be withdrawn from the liquid outlet hole, so that the second accommodating cavity, the liquid outlet hole and the first accommodating cavity are communicated, and the film-forming agent flows to the first accommodating cavity, so that the concentration of the film-forming agent in the electrolyte is improved. According to the battery provided by the invention, the cycle use frequency of the battery is large, the direct-current internal resistance of the battery is low, and the electrical performance of the battery is good.

An electrochemical device and an electronic device are provided. The electrochemical device includes a positive electrode. The positive electrode includes a current collector and a positive electrode active material layer. The positive electrode active material layer is located on at least one surface of the current collector and includes a first positive electrode active material layer and a second positive electrode active material layer. The first positive electrode active material layer is located between the current collector and the second positive electrode active material layer, where an adhesion force between the current collector and the first positive electrode active material layer is F1 N / m, and a cohesion force of the second positive electrode active material layer is F2 N / m, the positive electrode satisfying F1 / F2 ≥ 6. The foregoing positive electrode being used in the electrochemical device can not only improve safety performance of the electrochemical device, but also fully suppress direct current internal resistance of the electrochemical device at high voltage and high temperature and improve cycling performance of the electrochemical device.

The invention relates to trialkyl silicon-based phosphonate sulfate, a preparation process thereof and a secondary battery electrolyte using the trialkyl silicon-based phosphonate sulfate as an additive. The electrolyte comprises trialkyl silicon-based phosphonate sulfate, electrolyte salt, a non-aqueous organic solvent and other additives. The structural general formula of the sulfate is # imgabs0 #, wherein n is greater than or equal to 1; r1, R2 and R3 are selected from C1-C6 alkyl groups; the preparation method comprises the following steps: S1, a compound II reacts with a compound III, when X is selected from Br or Cl, a compound IV is obtained, and then the compound IV is hydrolyzed to obtain a compound V; y is selected from C1-C4 alkyl, so as to obtain a compound V; s2, oxidizing the compound V to obtain a compound VI; s3, reacting the compound VI with a trialkyl silicon-based compound to obtain a final product compound I; the reaction formula is as shown in figures. The trialkyl silicon-based phosphonate sulfate is used as a secondary battery electrolyte additive, so that the direct-current internal resistance of the battery can be reduced, the high-temperature cycle and high-temperature storage performance can be improved, and the gas expansion of the battery after high-temperature storage can be inhibited.