13results about How to "Increase fluid retention" patented technology

The invention relates to a negative electrode material and a preparation method thereof, and a lithium ion battery, the negative electrode material comprises a porous carbonaceous material and a silicon material, the negative electrode material has a first region located in the central region in the porous carbonaceous material, a second region distributed on the surface of the first region, and a third region distributed on the surface of the second region, the porous carbonaceous material located in the first area has first pores, the porous carbonaceous material located in the second area has second pores, the porous carbonaceous material located in the third area has third pores, at least part of the first pores are communicated with the second pores, at least part of the second pores are communicated with the third pores, and the third pores are communicated with the third pores. At least part of the third pores are communicated with the surface of the negative electrode material, the silicon material is distributed in at least one of the first pores, the second pores and the third pores, the pore diameter of the first pores is 0.1-2.2 nm, the pore diameter of the second pores is 1.8-5 nm, the pore diameter of the third pores is 3-60 nm, and the probability entropy H of the pores in the porous carbonaceous material meets 0.96 gt; hgt; and 0.70%.

The present application relates to the technical field of battery, in particular to a kind of graphite material and its preparation method and application.The present application provides a kind of graphite material, the graphite material includes graphite body, the graphite body has multiple through-hole structures, the hole diameter R of each through-hole structure is 0.07~1.81 μm;The particle size Dv50 of the graphite material and the hole diameter R of the through-hole structure satisfy:3.9≤Dv50 / R≤107.1.The graphite material of the present application has abundant through-hole structure, provides more channels for lithium ion deintercalation, and shortens the solid-phase diffusion path of lithium ion intercalation, so as to improve the rate performance of graphite negative electrode material, and the through-hole channel structure can improve the wettability and liquid retention of electrolyte, thereby improving the cycle performance of battery.

The application relates to the technical field of batteries, and discloses a pole piece, a battery cell and a battery. The pole piece comprises a current collector, a first active material layer and a second active material layer. In the thickness direction, the current collector comprises opposite first and second sides. The second side comprises a first empty foil area and a second empty foil area. In the length direction of the current collector, the first empty foil area and the second empty foil area are arranged in sequence, and the second empty foil area is arranged at one end of the second side. The first active material layer is coated on the first side. The second active material layer is coated on the first empty foil area. A liquid retention coating is coated on the second empty foil area. The battery cell comprises a separator, a positive pole piece and a negative pole piece. At least one of the positive pole piece and the negative pole piece adopts the pole piece. The separator is arranged between the positive pole piece and the negative pole piece. The battery comprises an aluminum plastic film and the battery cell. The pole piece, the battery cell and the battery can improve the liquid retention amount of the battery, thereby improving the cycle performance of the battery.

The utility model discloses an electrochemical device and electronic equipment, including electrode subassembly, including electrode main part and the first pole lug and the second pole lug of its same side extension, pole post subassembly is used for leading out the polarity of electrode main part, lower casing includes first casing and second casing and both connections form the step of intercommunication, wherein first casing is used for placing electrode main part, and second casing is used for placing pole lug, electrolyte and pole post subassembly, casing insulating part and pole post insulating part, and the connecting portion of pole lug and electrode main part is located at the step, upper cover plate is used for with lower casing connects and forms sealed structure, casing insulating part and pole post insulating part are located between pole post subassembly and lower casing, are used for the insulation of pole post subassembly and lower casing, the utility model discloses can effectively avoid the fatigue fracture of pole lug bending, and the step structure of setting reduces the heat of bending, improves energy density simultaneously.

The invention belongs to the technical field of sodium-ion batteries, and particularly relates to a solid particle volatilization pore-forming type sodium-electricity dry-method positive plate as well as a preparation method and application thereof. The positive plate is prepared by compounding positive electrode diaphragms prepared from a positive electrode material by a dry method on two sides of a current collector, the positive electrode material comprises a positive electrode active material, a conductive agent, a binder and a pore-forming agent, the pore-forming agent is solid particle hexachloroethane, and the D50 particle size of the solid particle hexachloroethane is less than or equal to 0.3 mu m. And the solid pore-forming agent is added into the positive electrode and forms tiny pores after high-temperature sublimation, so that the porosity of the pole piece is improved, the electrolyte retention capacity is increased, the concentration polarization is reduced, and the rate capability is improved under high surface density, thereby improving the energy density of the sodium ion battery.

This utility model belongs to the field of battery manufacturing technology and discloses a punching mold for aluminum-plastic film of soft-pack batteries. The punching mold for aluminum-plastic film of soft-pack batteries includes a concave mold, a guide mold, at least one first punch, and at least one second punch. The concave mold has at least one first groove and at least one second groove, with the second groove located on either side of the first groove. The guide mold is disposed on the concave mold, and the aluminum-plastic film to be formed is sandwiched between the guide mold and the concave mold. The first punch includes at least one first protrusion, which can pass through the guide mold and move towards the first groove to punch and form the receiving cavity. The second punch includes at least one second protrusion, which is located on either side of the first punch. The second protrusion passes through the guide mold and moves towards the second groove to punch and form the receiving space, thereby enabling the manufacture of aluminum-plastic film that improves the support strength, liquid retention, and / or safety of soft-pack batteries.

The application discloses a kind of gel PMMA slurry, diaphragm lithium battery and preparation method thereof.Gel PMMA slurry preparation method includes the following steps: step 1: methyl methacrylate is added to N-methyl pyrrolidone, and stirred uniformly;Then initiator azobisisobutyronitrile is added, and stirred min;Subsequently, temperature is raised to 50-70℃, and the heating rate is 3-5℃ / min, keep 30-50min, then continue to heat to 80-90℃, keep 2-4h, and the heating rate is 3-5℃ / min, then cool to room temperature to obtain PMMA gel;Step 2: alumina powder is added to N-methyl pyrrolidone, and stirred 30-40min;Then use bar pin type sand mill to sand mill to obtain inorganic powder solution;Step 3: PMMA gel prepared in step 1 is added to the inorganic powder solution obtained in step 2, and stirred to mix uniformly;Then dimethyl carbonate is added, and stirred to obtain gel PMMA slurry.The prepared gel PMMA coated diaphragm has great adhesion to pole piece and higher liquid absorption rate and liquid retention rate.

The invention provides a layered oxide material with a nanometer woven net interface structure and a preparation method and application thereof, and belongs to the field of electrode materials, a dilute acid solution is used as a reaction medium, and a spray pyrolysis mode is combined to enable dilute acid to fully react with a residual alkali compound on the surface of layered oxide, so that the layered oxide material is obtained. And synchronously converting into a uniform nano woven net interface structure in situ. A uniform nano interface structure can be prepared, belongs to a flexible film structure and has a relatively strong bonding effect, and the interface structure can persistently and stably exist in a charging and discharging process, so that the structural strain is reduced; the nano woven net interface structure has a relatively large specific surface area, so that the contact area and the liquid retention amount of the layered oxide material and an electrolyte are increased, and the diffusion of Li < + > and the migration of electrons are accelerated; the uniform knitted net interface structure can inhibit the surface oxidation of the material and the reaction with water and carbon dioxide in the air, improve the air tolerance of the matrix material, and also can greatly inhibit the erosion effect of the electrolyte on the matrix material.

The present application relates to the technical field of lithium battery, and particularly relates to a high-energy-density soft-pack lithium ion battery rapid formation process. The present application is formed through three stages of "first constant current charging, second constant current charging and third constant current discharging". The first constant current charging stage can effectively control the growth rate of SEI film in a manner of small current, medium current and large current step charging combination, and improve the stability of SEI film. The second constant current charging stage adopts medium current constant current charging to improve the liquid retention of the battery and reduce the thickness expansion in the cycle process. The third constant current discharging to the specified state of charge can enhance the interface stability of the battery and reduce the capacity loss of the battery in the hot pressing process. The formation process can improve the comprehensive performance of the high-energy-density soft-pack lithium ion battery, and can also shorten the formation time and improve the production efficiency.

This application discloses a battery comprising a cell and a liquid storage device. The cell has corresponding first and second surfaces. The liquid storage device is configured to store a portion of the battery's electrolyte and includes a first liquid storage portion disposed on the second surface. The cell has a positive tab and a negative tab, which are disposed on the first surface, or the positive and negative tabs are located on adjacent sides of the cell, with one of them disposed on the first surface. This not only increases the battery's liquid retention capacity without reducing its energy density, but also facilitates the battery's ability to feed back to the cell during the later stages of long-cycle operation, improving the battery's cycle performance and preventing performance degradation caused by residual electrolyte accumulating at the bottom of the battery casing.

The invention provides a positive electrode material composition, a positive plate, a preparation method of the positive plate and a lithium ion battery. The positive electrode material composition comprises the following components in parts by weight: 80 to 99 parts of a positive electrode active material, 0.1 to 20 parts of a conductive agent, 0.2 to 20 parts of a binder, 0.1 to 5 parts of a fast ion conductor and 0.1 to 5 parts of a lubrication aid, wherein the lubrication aid is metal ion modified nano cellulose. The fast ion conductor can still keep high ionic conductivity at low temperature, and the addition of the fast ion conductor is beneficial to improving the migration efficiency of lithium ions among electrode materials, reducing the impedance in the battery and enabling the lithium ion battery to provide more stable and higher-capacity discharge in a low-temperature environment. The metal ion modified nano cellulose is used as the wetting aid, so that the wettability of the positive plate is improved, the liquid retention of the positive plate is improved, and the low-temperature performance of the lithium ion battery is improved.

The present invention relates to the technical field of lithium batteries, and provides a wound lithium-ion battery. In the wound lithium-ion battery, in a single-sided area of ​​a negative electrode sheet at the center of a winding core, a plurality of recessed portions are provided on a side of a negative electrode current collector where a negative electrode active layer is not provided, and the projections of the first end of a first negative electrode active layer and the first end of a second negative electrode active layer in different bending areas overlap in the thickness direction of the winding core. The overlapping of the recessed portions and the projections of the negative electrode active layers can significantly increase the liquid retention in the center of the winding core, improve the wettability of the electrolyte, and thus improve the cycle performance of the battery and reduce lithium plating.

The application discloses a kind of negative electrode slurry, negative electrode sheet and preparation method thereof, belong to negative electrode slurry technical field;The negative electrode slurry includes: negative electrode active material 84.5~99 parts, water 80~140 parts, dispersing agent 0.1~1.5 parts, conductive agent 0.1~4 parts, binder 0.1~4 parts, electrolyte reserve storehouse emulsion 0.01~4 parts, the high molecular particle of core-shell structure is contained in the electrolyte reserve storehouse emulsion, the inner core of high molecular particle is acrylate, butadiene and styrene copolymer, shell is the copolymer of acrylic acid and acrylonitrile.In the present application, electrolyte reserve storehouse emulsion is added in negative electrode slurry, the inner core of high molecular particle contained therein can effectively adsorb electrolyte, can play the role of liquid preservation;And shell has certain rigidity, avoid the volume expansion of inner core after adsorbing electrolyte and then affect the performance of negative electrode sheet.