45results about How to "High rate discharge" patented technology

The invention discloses a composite lithium ion battery ceramic diaphragm, wherein single-face or double-face electrostatic spinning is carried out on a ceramic coating diaphragm. The preparation method comprises the following steps: step 1, preparing an electrostatic spinning solution; step 2, carrying out electrostatic spinning; and step 3, treating the composite diaphragm obtained by spinning. The electrostatic spinning is carried out on the surfaces of the existing polyolefin ceramic coating diaphragm and non-woven fabric ceramic coating diaphragm, the electrostatic spinning can be used for fastening and constraining ceramic granules to prevent the ceramic granules from dropping, and moreover, the electrostatic spinning is used as a soft buffering layer to perfect the contact of the diaphragm with the surface of an electrode, so as to reduce the interface impedance of the diaphragm and a battery pole piece and help to improve such properties of the battery as rate discharge and cycle life, etc.

The invention relates to a surface finish method of a carbon fluoride material. The method comprises the following steps: (1) mixing nanometer copper and carbon fluoride, then adding a solvent for ball milling so as to form a combined pulp; (2) drying the mixed pulp so as to form a mixture; (3) screening the mixture so as to obtain the powder mixture; (4) putting the powder mixture into an atmosphere oven so as to be calcined; (5) taking out the calcined powder mixture, lowering the temperature of the calcined powder mixture to the room temperature, and then screening the calcined powder mixture of which the temperature is lowered so as to form the carbon fluoride material modifies by the nanometer copper. According to the invention, the carbon fluoride and the nanometer copper with good conductivity are mixed, and after the mixture is calcined at a high temperature in an inert atmosphere, the nanometer copper reacts on the surface of the carbon fluoride, so that the phenomenon that the voltage of carbon fluoride is delayed is obviously improved, and high-ratio discharge and low temperature performance are greatly improved. The carbon fluoride with a finished surface, prepared by the method, is used as a positive material to be made into a lithium-carbon fluoride battery system, wherein the lithium-carbon fluoride battery system has the properties of high-ratio discharge and low temperature high-current discharge, so that the application range of the lithium-carbon fluoride battery system is extended.

The invention discloses a direct current power supply emergency system of a transformer substation based on a lithium iron battery. The direct current power supply emergency system consists of portable split structure units which are connected in a fast-connection plugging mode. The portable split structure units comprise a lithium iron battery pack unit, a power distribution control switch unit,an inverter unit and a charging control unit, wherein the power distribution control switch unit comprises two air switches, the inverter unit comprises an inverter, and the charging control unit comprises an alternating current air switch, an air switch, a rectifier and a monitor device unit. The direct current power supply emergency system has small size of unit structures, is convenient for transformation and assembly in situ, greatly meets the emergency requirement of accident rescue of a power system and can be simultaneously used as a standby power supply for the field maintenance of the direct current power supply of the transformer substation.

A solid polymer electrolyte, a lithium battery employing the same, and methods of forming the electrolyte and the lithium battery. The polymer electrolyte includes polyester (meth)acrylate having a polyester polyol moiety having three or more hydroxide (—OH) groups, at least one hydroxde group being substituted by a (meth)acrylic ester group and at least one hydroxide group being substituted by a radical non-reactive group, or its polymer, a peroxide having 6 to 40 carbon atoms, and an electrolytic solution including a lithium salt and an organic solvent.

The invention relates to a novel large-volume primary lithium liquid flow storage battery. The novel large-volume primary lithium liquid flow storage battery comprises a liquid storage part, a reaction part, and a fluid driving part, wherein the liquid storage part contains a mixed solution, and the mixed solution has liquidity and is constituted by positive active materials and an electrolyte; the reaction part comprises a positive pole and a negative pole, the positive pole is a complex carbon material cathode carrier formed on a current collector, the negative pole is alkali metal or alloy of the alkali metal, and a channel through which fluid can flow is formed between the positive pole and the negative pole; the fluid driving part drives the mixed solution to flow through the channel of the reaction part and generate electrochemical reaction with the positive pole and the negative pole in the channel. The novel large-volume primary lithium liquid flow storage battery is good in high-rate output performance, can be adaptable to large-current-density charging, and is wider in use temperature range. Besides, due to the uninterrupted circulation of the liquid, the radiation effect of the battery is greatly improved, so that the safety performance is guaranteed.

The invention belongs to the technical field of batteries, and particularly relates to a battery diaphragm and a preparation method thereof. The battery diaphragm provided by the invention comprises abase film and a PVDF/PMMA composite coating arranged on at least one side face of the base film in a coating manner; and preferably, the battery diaphragm comprises a base film and PVDF/PMMA composite coatings arranged on both sides of the base film in a coating manner. According to the battery diaphragm provided by the invention, a PVDF/PMMA composite coating is obtained by spraying a mixed slurry of PVDF and PMMA on at least one side face of the base film in a spraying manner, and the prepared battery diaphragm has low air permeability value added, has excellent bonding performance, needlepunching strength, tensile strength and heat shrinkage performance, and can improve the rate discharge and cycle performance of the battery.

The invention discloses a lithium ion battery electrode, a lithium ion battery and a lithium ion battery preparation method. The lithium ion battery electrode comprises an anode and a cathode, the cathode comprises a cathode piece and a cathode lug, the cathode lug is arranged at a middle position of the cathode piece, the cathode piece comprises a current collector and a cathode substance coatedon the current collector; the anode comprises an anode piece and an anode lug, the anode lug is arranged at a middle position of the anode piece, the anode piece comprises a current collector and an anode substance coated on the current collector, isolated layers are arranged positions, corresponding to the cathode lug, on the front and the back of the anode piece, and deintercalation of lithium ions in the anode substance is blocked. The lithium ion battery electrode disclosed by the invention has the advantages that the cathode lug is arranged at the middle position, and the isolated layersare arranged at corresponding positions of the anode piece, thereby guaranteeing that no anode substance exists at a corresponding position of the cathode plug and reducing internal resistance while safety of a lithium battery is guaranteed, and high-rate discharge can be realized more easily.

The invention relates to a phosphate composite cathode material and a preparation method and application thereof. The composite cathode material has a core-shell structure, wherein the core is a phosphate-based lithium ion battery cathode material doped with metal oxide, and the shell is a cladding layer composed of an N-doped titanium oxide, a composite carbon material, and a transition metal oxide lithium cathode material. The invention can design the cladding layer composed of the N-doped titanium oxide, the composite carbon material and the transition metal oxide lithium cathode material,so that the transition metal on the surface of the phosphate-based cathode material and the carbon can be coordinated by X-C bonds, and the carbon is stably coated on the surface of the cathode material, and the structure can repair the lattice interface, prolong the cycle life and improve the cycle stability of the cathode material, and improve the electrochemical performance of the material. Thefirst discharge specific capacity of the phosphate composite cathode material is greater than 152mAh/g at 8C rate, and the capacity retention rate is greater than 95% after 1500 cycles. The phosphatecomposite cathode material has good application prospect.

The invention belongs to the technical field of batteries, in particular to a separator for batteries, a preparation method thereof and batteries. The battery diaphragm comprises a composite coating diaphragm and a PMMA coating coated on at least one surface of the composite coating diaphragm. Preferably, the PMMA coating is provided on both surfaces on the outside of the composite coating diaphragm. The diaphragm used in the battery has low permeability increase value, meets the requirements of ion migration of the battery, improves the adhesion performance with the electrode plate, reduces the interface resistance, and thus improves the rate discharge and cycle performance of the battery.

The invention belongs to the technical field of batteries, in particular to a separator for batteries and a preparation method thereof. The separator for battery comprises a base film, an aramid coating and a composite coating of PVDF and PMMA. On the premise of guaranteeing the permeability of the separator, the adhesive force is improved, the adhesion between the separator and the battery electrode sheet is good, the interface resistance is reduced, and the cell hardness is improved. A method for prepare a separator for a battery. The composite coating of PVDF and PMMA was obtained by spraying the mixture of PVDF and PMMA on the aramid coatings. The prepared separator has low permeability and value-added, good adhesion to the battery electrode, and can improve the rate discharge and cycle performance of the battery.

The invention discloses a self-healing solid electrolyte for a lithium battery and a preparation method of the solid electrolyte, and belongs to the technical field of lithium ion batteries. The electrolyte comprises the following components of silyl-terminated polyether, bis (fluorosulfonyl) lithium imide, organic auxiliaries, additives, a first solvent and a second solvent, wherein the first solvent is used for dissolving silyl-terminated polyether and bis (fluorosulfonyl) lithium imide, and the second solvent is used for dissolving the organic auxiliaries; based on 100 parts of total mass of the first solvent and the second solvent, the usage of the silyl-terminated polyether is 25-50 parts; the molar ratio of the mole number of bis (fluorosulfonyl) lithium imide to the mole number of silyl-terminated polyether is 1 to 10-30; the usage of the organic auxiliaries is 1-10 parts; and the usage of the additives is 0-15 parts. By virtue of the novel self-healing solid electrolyte material provided by the invention, the performance of the energy density, the cycle life, the rate discharge and the like of the battery are not lower than those of the existing liquid organic electrolyte.

The invention relates to the technical field related to lithium ion batteries, and particularly provides a lithium ion battery electrode containing a micro-nano graphene coated single crystal positiveelectrode material. Raw materials comprise the micro-nano graphene coated single crystal positive electrode material, a conductive agent, a binder and a current collector, wherein the preparation rawmaterials of the micro-nano graphene coated single crystal positive electrode material include graphene and a single-crystal positive electrode material, and the single-crystal positive electrode material is a layered single-crystal structure. The invention provides the lithium ion battery electrode containing the micro-nano graphene coated single crystal positive electrode material. Crystal forms and particle size distribution of the single crystal positive electrode material before and after coating are basically consistent, and when the micro-nano graphene coated positive electrode material meeting the conditions is used as the preparation raw material of the battery electrode, comprehensive performance of the battery is favorably optimized.

A preparation method of a glass fiber nonwoven fabric aramid coating diaphragm belongs to the technical field of lithium ion battery diaphragms. The preparation method includes the following steps: A,preparation of aramid slurry: taking PMIA, alumina, dispersant and oil solvent at a certain ratio, heating and stirring the materials, dissolving the materials at 70-90 DEG C, and mixing the materials evenly to obtain a mixture; and B, preparation of a diaphragm: coating a piece of glass fiber nonwoven fabric with the mixture by means of oil coating, and obtaining an aramid coating diaphragm through an extraction process. The glass fiber nonwoven fabric aramid coating diaphragm prepared by the invention has better air permeability, higher mechanical strength and higher ionic conductivity, andcan improve the rate discharge and cycle performance of lithium ion batteries.

The invention discloses a battery diaphragm and a preparation method thereof and a battery, the battery diaphragm comprises a diaphragm base material and a PVDF coating coated on at least one side surface of the diaphragm base material, and the PVDF coating comprises ring-like coating points with the distribution density of 30/cm < 2 >-800/cm < 2 >. Compared with an existing multi-layer coating diaphragm, the battery diaphragm provided by the invention has the advantages that the coverage rate of the PVDF coating is relatively low, the air permeability of the battery diaphragm is good, good bonding force between the battery diaphragm and a battery pole piece can be ensured, and meanwhile, the performance of rate discharge, cycle life and the like of a battery can be improved.

The invention discloses a method for improving the rate discharge of a soft-package ion battery, belonging to the technology of an ion battery. The technical scheme of the method comprises a binity pole piece group, a trinity pole piece group and a diaphragm paper, wherein pole piece monomers in positive and negative pole piece groups are overlapped according a certain method and separated by diaphragm paper to form a lamination body overlapped by the binity pole piece group or a lamination body overlapped by the trinity pole piece group, and the lamination bodies can be overlapped for many times according to demands. The invention provides the method for improving the rate discharge of the soft-package ion battery.