56results about How to "Improve self-discharge performance" patented technology

The invention discloses an inorganic/organic composite functional porous isolating membrane. The isolating membrane comprises porous base material and at least one inorganic functional coating adhering to the surface of the porous base material, and aqueous slurry prepared for the inorganic functional coatings is prepared from inorganic ceramic particles, water-soluble polymer thickener and aqueous polymer adhesive; the inorganic ceramic particles comprise the same substance in two types of particle sizes, wherein the average particle size (D50) of the smaller inorganic ceramic particles is 0.2-0.5 micrometer, and the average particle size (D50) of the larger inorganic ceramic particles is 0.6-1.0 micrometer; the aqueous polymer adhesive is a hydrophobic high-molecular polymer with the water drop contact angle of the dry adhesive of the aqueous polymer adhesive 110-140 degrees; the solid content of the aqueous slurry is 40-60%. According to the inorganic/organic composite functional porous isolating membrane, the high-temperature thermal stability of the isolating membrane can be effectively improved by means of the inorganic functional coatings, and the water content of the inorganic coatings is effectively reduced, so that the safe performance of a battery and the stability of long-term circulation are improved.

The invention provides a polyethylene microporous membrane, a preparation method and a lithium ion battery. The polyethylene microporous membrane comprises a front side and a reverse side, wherein the average aperture size of the front side is 100 to 200nm; the average aperture size of the reverse side is 50 to 100nm; the average aperture size ratio A:B of the front side and the reverse side is 1.1 to 4.0:1; the aperture size distribution is smaller than 30 percent. When the microporous membrane prepared through the preparation method is applied in the lithium ion battery, the front side is close to the positive pole of the battery and the reverse side is close to the negative pole of the battery, so that the polyethylene microporous membrane not only has a good high-rate discharge performance, but also has a good self-discharge performance.

The invention provides a method for preparing a battery pole piece. The method comprises the following steps: coating pole slurry on a current collecting body; and vibrating the obtained current collecting body coated with the pole slurry on the surface. The invention provides a device for preparing the battery pole piece. The device comprises a coating device and a vibrating device, wherein the pole slurry is coated on the surface of the current collecting body by the coating device, and the vibrating device is used for vibrating the current collecting body coated with the pole slurry on the surface. After being placed in a room with the temperature of 20+/-2 DEG C and the humidity of 20 percent-50 percent for 28 days in an open circuit, a battery with the volume of 4.2 V, which is prepared by the battery pole piece prepared by the device and the method, reduces the voltage by 5 mV at most, and the micro-short circuit rate tested by 20,000 batteries is 0.01 percent; and the battery prepared by a device and a method in the prior art has the voltage reduction up to 50 mV and the micro-short circuit rate of 0.05 percent under the completely same condition.

The invention discloses a negative electrode hydrogen storage material for a nickel-hydrogen battery capable of being used at a low temperature, which comprises the atomic ratio ingredient composition shown as the following formula: RExMg<1-x>NiyxMz, wherein in the formula, x is greater than or equal to 0.7 and is smaller than or equal to 1, y is greater than or equal to 3.5 and is smaller than or equal to 3.9, z is greater than or equal to 1 and is smaller than or equal to 1.4, RE is one kind of materials or a mixture prepared from several kinds of materials at any mixture ratio in rare earth metals La, Ce, Pr or Nd, Ce-enriched mixed rare earth metal Mm, and La-enriched mixed rare earth metal Ml, and M is one kind of materials or a mixture of several kinds of materials at any mixture ratio in transition metal elements Co, Al, Mn, Fe, Cr and Ti. The discharging capacity during the application of the nickel-hydrogen battery negative electrode hydrogen storage alloy material of the invention under the low temperature (i.e. the temperature is ranged from 35 DEG C below zero to 0 DEG C) is much higher than the electrochemical discharging capacity of the existing products sold on markets, and the low-temperature performance is greatly improved. In addition, nickel-hydrogen battery products prepared from the negative electrode hydrogen storage material and the electrolytic solution of the invention have the characteristics of high low-temperature electrochemical capacity, obviously improved self discharging performance and high-speed discharging performance, wide application temperature range and the like, and can completely meet the requirement of normal use in low-temperature and normal-temperature environment.

The invention discloses a high-barrier corrosion-resistant lithium battery packaging film, which comprises a nylon layer, an aluminum foil layer and a heat-seal layer, and further comprises an outer graphene layer, an inner graphene layer and a silicone rubber layer, wherein the nylon layer, the outer graphene layer, the aluminum foil layer, the inner graphene layer, the silicone rubber layer andthe heat-seal layer are sequentially distributed from outside to inside, the nylon layer is prepared from MXD6, glass fibers, LLDPE-g-MAH, nanometer silicon dioxide, a silane coupling agent and hydroquinone, and the heat-seal layer comprises polypropylene, glass fibers, nanometer calcium carbonate, talcum powder and barium sulfate. The high-barrier corrosion-resistant lithium battery packaging film has good corrosion resistance.

The invention discloses a lithium-supplementing negative electrode piece, a preparation method thereof, and a lithium ion battery. The lithium-supplementing negative electrode piece comprises a negative electrode piece body and a lithium-supplementing composite layer coated on the surface of the negative electrode piece body. The lithium-supplementing composite layer comprises the following raw materials in percentage by mass: 20%-65% of alloy lithium powder; 30%-70% of ceramic powder; and 5%-50% of a binder. According to the lithium-supplementing negative electrode piece disclosed by the invention, by arranging the lithium-supplementing composite layer, the safety performance of the lithium ion battery is enhanced, and the self-discharge performance of the battery is increased from -0.06mv/h to -0.04mv/h. The lithium alloy powder in the lithium-supplementing composite layer can effectively reduce the activity of lithium and reduce the transportation risk; and the ceramic powder can improve the electrolyte absorption performance of the electrolyte and prolong the cycle life of the battery cell.

The invention provides a preparation method of a redox type gel electrolyte for an all-solid-state supercapacitor, and the method comprises the following steps: synthesizing a polymer P(PDP-co-TEMPO)(([3-(methacrylamido)propyl]dimethyl(3-thiopropyl) ammonium hydroxide inner salt)-2-methyl-2-methacrylic acid-2, 2, 6, 6-tetramethyl-4-piperidyl nitric oxide copolymer) by using a free radical polymerization method; preparing P(PDP-co-TEMPO) powder by adopting a freeze-drying method, and then dissolving the obtained powder into a lithium chloride aqueous solution to form the final redox type gel electrolyte. The preparation method provided by the invention is simple in process, low in cost and high in yield, can be used for mass production, and can achieve ultrahigh electrochemical performanceand good self-discharge performance and cycle performance when being applied to an all-solid-state supercapacitor. By controlling the amount of inorganic salt lithium chloride, the ionic conductivityand the water content of the polyamphoteric gel electrolyte can be controlled.

The invention belongs to the technical field of flexible devices, and particularly relates to an electrochemical battery. The electrochemical battery comprises positive electrodes, an isolating membrane, negative electrodes, an electrolyte and an outer package structure, wherein the sum n of the number of the positive electrodes and the number of the negative electrodes is an even number; the outer package structure at least comprises a positive current collector a or/and a negative current collector b; and the outer package structure is a positive tab and a negative tab of a battery core respectively. The electrode current collectors at the outmost layer demonstrate the functions of the package material of the battery and the battery tabs; the variety and the comsumption of materials are reduced; the material cost is reduced; meanwhile the energy density of the battery is improved; and in the preparation process, only the current collectors on the seal edge are subjected to packaging assistant treatment, so that the problems of the package reliability can be solved; the treatment cost can be reduced (the consumption of an expensive treating fluid is reduced); and finally the side effect of an electrode impedance increase caused by the packaging assistant treatment can also be reduced.

The invention relates to the field of preparation of lithium batteries, and in particular to a method for preparing a water-based super-nano lithium iron phosphate battery. The lithium iron phosphatebattery provided by the invention is prepared from the following steps: firstly preparing positive and negative electrode slurry, respectively coating the obtained positive and negative electrode slurry on the surface of an aluminum foil to obtain positive and negative pole pieces, and laminating the positive and negative pole pieces, then placing the same in a battery shell, injecting electrolyte, and finally completing formation and volume separation steps to obtain the lithium iron phosphate battery. By adoption of the method provided by the invention, the problem of poor performance at lowtemperature of the lithium iron phosphate battery in the prior art is overcome, and the lithium iron phosphate battery has the advantages of good low temperature resistance, high energy density, better safety performance and smaller resistance.

A battery pack includes a battery coupled between a first terminal and a second terminal and a battery manager configured to sense a state of charge of the battery; a load circuit coupled between the first terminal and the second terminal and configured to receive discharge power from the battery; a power generator coupled between the first terminal and the second terminal and configured to supply charge power to the battery; and a controller configured to control the battery pack and the power generator and to force discharging of the battery to make the state of charge of the battery equal to a reference value when a signal to initiate self-discharging is received from a user.

The invention discloses a preparation method of a lead-acid storage battery anode for an electric bike. The lead-acid storage battery anode comprises the following components in percent by weight: 1.2-1.6 percent of Sn, 0.2-0.6 percent of Al, 0.01-0.02 percent of Bi, 0.02-0.08 percent of Ag, 0.02-0.05 percent of In, 0.05-0.10 percent of Cu and the balance of Pb. The preparation method comprises the steps of: 1, placing the Sn, the Ag, the In and the Cu into a crucible, heating to reach the temperature of 1130-1150 DEG C for melting, uniformly stirring, pouring into an ingot mould, cooling to obtain an ingot casting for later use; 2, smelting the Al and the Bi in a lead pan, melting at a temperature of 640-660 DEG C and preserving the temperature, placing the ingot casting into the lead pan, uniformly stirring after the ingot casting is molten, standing for 15-20min; and 3, regulating the pouring temperature to be 570-580 DEG C, and pouring into a board gate mould to form a board gate.

The invention discloses a preparation method of a FeCoCuZn co-doped Ni-based alloy-carbon nanotube composite material modified diaphragm. The method comprises the following steps: weighing a self-synthesized high-entropy alloy/carbon nano composite material and a binder according to a ratio, uniformly grinding, dropwise adding a solvent to prepare slurry, and coating a diaphragm base membrane with the slurry by using a coating machine; and performing microwave heating treatment under inert gas protection for 5-30 minutes, enabling the heating temperature of the diaphragm coated with the slurry to be 50-80 DEG C, and cooling the diaphragm to normal temperature at a cooling speed of about 20 DEG C/min after heating to obtain a modified diaphragm with the FeCoCuZn co-doped Ni-based alloy-carbon nano tube composite material coating. The thickness of the FeCoCuZn co-doped Ni-based alloy-carbon nanotube composite material coating of the diaphragm is 2-15 [mu]m. When the modified diaphragm is applied to a battery, the conductivity of a positive electrode can be improved, battery expansion can be relieved, the side reaction of the positive electrode and an electrolyte can be inhibited, the mechanical lightness and puncture strength of the diaphragm can be improved, and the safety and self-discharge performance of the battery can be effectively improved.

The invention relates to praseodymium-free, neodymium-free and cobalt-free high capacity superlattice hydrogen storage alloy containing magnesium. The alloy is characterized in that a composite chemical formula of the alloy is one of Mm(1-x-y)LaxMgyNiaAlb, Mn(1-x-y-z)LaxMgyMzNiaAlb, Mm(1-x-y)LaxMgyNiaAlbNc or Mm(1-x-y-z)LaxMgyMzNiaAlbNc, wherein Mm is rare earth or misch metal at least containing one or more than one of La, Ce, Y, Sm and Gd; M is one or more than one of Ti, Zr and Hf; N is one or more than one of Mn, Sn, Cr, V, W and Mo; x, y, z, a, b and c represent molar ratios. Compared with the prior art, the alloy has the advantages of large discharge capacity, low cost and good low self discharge property.

The invention relates to a lithium, aluminum and fluorine co-doped lithium iron phosphate positive electrode material and a preparation method thereof; the preparation method comprises the following steps of enabling Al(NO3)3.9H2O, LiNO3 and NH4F to be dissolved in deionized water separately and performing uniform mixing; next, adding LiFePO4 powder to be reacted, wherein the molar ratio of Al(NO3)3.9H2O to LiNO3 to NH4F to LiFePO4 is 1 to (0.8-1.2) to (4-4.5) to (30-36), the reaction temperature is 150-160 DEG C, and the reaction time is 5-8h; carrying out washing and drying, wherein the drying temperature is 80-90 DEG C, and the drying time is 12-14h; and next, carrying out calcining, wherein the calcining temperature is 500-550 DEG C and the calcining time is 6-8h, to obtain the lithium, aluminum and fluorine co-doped lithium iron phosphate positive electrode material. The conductivity of the prepared lithium iron phosphate positive electrode material is improved and the material isapplied to a battery, so that the electrochemical performance and the cycling performance of the battery are improved.