69results about How to "Does not affect electrochemical performance" patented technology

The invention provides a capsule and a lithium ion battery. The capsule is accommodated in the lithium ion battery and comprises a capsule wall and a capsule core. The melting point of the capsule wall ranges from 100 DEG C to 160 DEG C and is not dissolved in electrolyte of the lithium ion battery. The gasification temperature of is not lower than the melting point of the capsule wall and not higher than 400 DEG C. Gas generated by capsule core gasification is flame retardant. The flame-retardant gas is mixed with electrolyte steam and/or combustible flue gas/combustible smoke steam generated during thermal runaway of the lithium ion battery and sprayed out from the outer package of the lithium ion battery. The lithium ion battery comprises the capsule. When the lithium ion battery operates normally, the capsule does not affect electrochemical performance of the lithium ion battery. During thermal runaway of the lithium ion battery, the capsule wall cracks to release the capsule core, the capsule core is gasified to form the flame-retardant gas, the flame retardant function of the capsule is achieved, flame retardance is achieved, and safety performance of the lithium ion battery is improved.

The invention relates to a positive electrode material for a sulfur-based lithium ion battery and a preparation method and application of the positive electrode material. During the preparation process of the positive electrode material for the sulfur-based lithium ion battery, a sulfur positive electrode material is lithiated with metal lithium powder; under the protection of an inert atmosphere, the metal lithium powder and a sulfur-based positive electrode such as a sulfur-carbon based composite material or a sulfur-polymer composite material are uniformly mixed by a ball milling method or a coating method; and a certain amount of an electrode is dropwise added into the mixture, and a high-lithiation positive electrode material is obtained after appropriate lithiation time. From the angle of the lithiated sulfur positive electrode, a metal lithium negative electrode is substituted to provide a lithium source, the usage and production cost of a lithium-sulfur battery is saved, meanwhile, the dendrite crystal problem brought by the metal lithium serving as the negative electrode is avoided, and thus, the safety of a lithium-sulfur battery system is improved.

The invention relates to a lithium ion battery technology field, in particular to a safe lithium ion battery, improvement method and the manufacturing method of its anode strip. The inventive method of improving the lithium ion battery safety is to raise the facial resistance of the anode strip, and to reduce the thermal conductivity of the anode strip, namely to cover a metal oxide material membrane layer on the anode strip surface of the lithium ion battery for raising the facial resistance of the anode strip and reducing the thermal conductivity of the anode strip. Use of the invention can raise the facial resistance of the anode strip, so after of the cathode current collector is in short circuit with the anode diaphragm, the resistance is greater, its current is smaller, resulting in a reduction of the produced, thereby the manufactured battery may easily pass through the short-circuit test, and the safety factor reaches the standard. At the same time the film layer formed by adopting the metal oxide, has a better hole for passing through lithium ions in its material interior structure, without any influence on the electrochemistry performance of the battery. The lithium ion battery that adopts this invention has a higher safety than the safety performance of the ordinary lithium ion battery.

The invention discloses a stretchable supercapacitor with a stainless steel spring adopted as a base. The stretchable supercapacitor includes a stainless steel spring, an inner-layer electrode, an outer-layer electrode, and a gel electrolyte, wherein the stainless steel spring is adopted as the base of the stretchable supercapacitor, the inner-layer electrode and the outer-layer electrode are formed on the surface of the spring through in-situ growth or coat the surface of the spring, and the gel electrolyte is located between the two electrodes; the whole device is encapsulated with a flexible polymer material, so that the leak of the electrolyte can be prevented; the stainless steel spring, on the one hand, is adopted as a current collector of the inner-layer electrode, and on the otherhand, provides excellent stretchability for the device; the inner-layer electrode is made of a material such as a carbon material, a metal oxide and conductive polymer; the electrolyte is made of a polymer/electrolyte gel system such as PVA/H2SO4 and PVA/H3PO4; and carbon nanotubes or MXenes are wound so as to form the outer-layer electrode. The supercapacitor of the present invention can work normally under large tensile strain; the expected tensile strain of the supercapacitor can be as high as 100% under premise that the performance of the supercapacitor is not affected; and the outer spaceof the spring structural component can be efficiently utilized. The supercapacitor can be applied to systems such as high-speed train wireless monitoring systems.

The invention relates to a measurement device for an inner temperature of a battery. The measurement device comprises a first packaging shell and a battery pack arranged in the first packaging shell, wherein the battery pack comprises at least two single batteries; the at least two single batteries are stacked; each single battery comprises a battery core and a second packaging shell; the second packaging shell is used for packaging the battery core; the measurement device for the inner temperature of the battery further comprises at least one temperature sensor; the at least one temperature sensor is arranged between the at least two single batteries and is clamped by the at least two single batteries.

The invention relates to a method for preparing a cathode material ZnS/C-SnO2 of a sodium ion battery by utilizing tin sludge. The method comprises the following steps: S1, washing and drying tin sludge to obtain an SnO2 material; S2, preparing a ZnS/C composite material by a one-step hydrothermal method, namely performing a hydrothermal reaction by using zinc salt, sulfur source and organic carbon source as raw materials, collecting precipitate and drying to obtain a composite material precursor after the reaction is completed, roasting the composite material precursor in an inertial atmosphere to obtain a ZnS/C composite material; and S3, mixing the SnO2 material prepared in the step S1 with the ZnS/C composite material prepared in the step S2 in a proportion to prepare the cathode material ZnS/C-SnO2 of a sodium ion battery. According to the method, the problem that tin sludge generated in tinning is not properly recycled can be solved, the problem of high cost of SnO2 can be solvedby preparing the cathode material of a sodium ion battery from the tin sludge, the cost for raw materials can be effectively reduced, the concept of low cost for sodium ion batteries can be met, andcomprehensive utilization of resources can be realized.

The invention relates to a carbon nanotube/graphene/activated carbon composite electrode material and a preparation method and application thereof. The carbon nanotube/graphene/activated carbon composite electrode material is prepared by the steps of adding activated carbon, carbon nanotubes and graphene oxide into a dispersant aqueous solution, uniformly mixing, adding the mixed solution into a reactor, stirring, carrying out a co-reduction reaction under the conditions of a reducing agent and a certain temperature, and finally filtering, cleaning and drying the obtained reaction product to obtain the high-performance carbon nanotube/graphene/activated carbon ternary composite electrode material. The carbon nanotube/graphene/activated carbon composite electrode material has a hierarchicalthree-dimensional porous structure, a high specific surface area and excellent conductivity, overcomes the defect of single pore structure of the activated carbon, enables the activated carbon to still have high specific capacity and high rate performance in an organic electrolyte, can be used as an electrode material of a supercapacitor, and is widely applied to the field of electrochemical material preparation.

The invention provides a lithium titanate composite material and a preparation method and application thereof. The lithium titanate composite material comprises lithium titanate particles and lithium phosphate glass coated on the surface of the lithium titanate particles. The preparation method comprises the following steps of: uniformly mixing the lithium titanate particles and the mixture of a lithium source and a phosphorus source in a liquid system solvent to obtain uniformly-mixed liquid; performing ball milling on the uniformly-mixed liquid to form slurry; taking out the slurry and drying to obtain the precursor powder of the composite material; calcining the precursor powder of the composite material; and cooling and breaking to obtain the lithium titanate composite material of which the lithium phosphate glass is coated by the lithium titanate on the surface. The lithium titanate composite material is used as an active substance of a lithium ion battery or an electrode material of a capacitor. The lithium titanate composite material can suppress expansion of a lithium ion battery when applied to the lithium ion battery, improves the high-temperature storage and cycle performance of the lithium ion battery, increases the diffusion coefficient of lithium ions in the active substance, and is favorable for improving the rate capability of lithium titanate.

The invention discloses a preparation method of an aqueous high rate sodium ion battery. The method includes the steps of: firstly taking a sodium source, a vanadium source, and ammonium dihydrogen phosphate as the raw materials to prepare a precursor, and then performing sintering at certain temperature to obtain a sodium ion battery positive electrode material; mixing the prepared sodium ion battery positive electrode material with a conductive agent and a binder, then adding the mixture into an organic solvent, and performing stirring to obtain a positive slurry, then coating a current collector surface with the slurry, and conducting drying and rolling to obtain a positive plate; then preparing a negative plate; preparing an electrolyte solution, finally superimposing the prepared positive plate, negative plate and a diaphragm, and conducting stacking winding with a winding machine into a coiled battery core, and putting the battery core in a battery shell, injecting the prepared electrolyte solution, and performing sealing to obtain the sodium ion battery. The sodium ion battery prepared by the method provided by the invention has good safety and excellent cycling performance.

The invention relates to a method for uniformly doping the surface of a material with metal ions, and a product thereof, and application of the product. The method mainly comprises the following steps: uniformly depositing a nanolayer of metal ions on the surface of a material (such as a positive electrode material); carrying out special heat treatment to realize inward penetration and doping of the metal ions on the surface of the substrate material within a specific thickness range; and acquiring a quantitatively-doped surface nanolayer on the surface of the substrate material. The positiveelectrode material prepared by using the method can effectively realize passivation of the surface and is reduced in the degree of side reactions and improved in the stability of the material; meanwhile, doping of the metal ions is only carried out in a range of 1 to 30 nm deep from the surface, and the body structure of the material is not affected, so the material can retain its original ion transmission characteristics and overcome the problem of unfavorable influence of traditional coating on the electrochemical performance of the material, and thus, the material has high practical application prospects in the field of lithium ion batteries.

The invention discloses a safe lithium ion battery coil core and a lithium ion battery containing the safe lithium ion battery coil core. The safe lithium ion battery coil core is formed by winding anegative plate, a positive plate and a diaphragm stacked between the negative plate and the positive plate, wherein an electrode plate on the outer side of the safe lithium ion battery coil core is the negative plate; the tail end of the negative plate on the outer side of the safe lithium ion battery coil core is a blank tail end without a negative active layer; a negative tab is electrically connected to the surface, which deviates from the inner side of the safe lithium ion battery coil core, of the blank tail end; a temperature-resistant insulating layer is bound to the surface, which faces the inner side of the safe lithium ion battery coil core, of the blank tail end; and the temperature-resistant insulating layer and the negative tab are in negative correspondence at an electric connection point on the surface of the blank tail end. The safe lithium ion battery coil core and the lithium ion battery with the same disclosed by the invention have high safety and excellent electrochemical performance.

The invention belongs to the field of batteries, and particularly relates to a composite particle for a battery, a battery diaphragm and a lithium ion battery. The composite particle for the battery comprises a phase change particle and an inorganic compound coating layer coating the surface of the phase change particle, wherein the phase change particles are paraffin, crystalline hydrated salt ormolten salt; and the inorganic compound coating layer is silicon dioxide, attapulgite, kaolinite, montmorillonite, hydrotalcite, vermiculite, sepiolite, mica, illite, diatomite, titanium dioxide, zinc oxide, aluminum oxide or nanocellulose. The composite particle for the battery provided by the invention can effectively control the internal temperature of the lithium ion battery, reduce the internal temperature fluctuation of the lithium ion battery during charging and discharging, absorb part of heat during thermal runaway, reduce the heat release amount of the battery to a certain extent, ensure the safety of the lithium ion battery, and does not affect the electrochemical performance of the battery.

The invention belongs to the technical field of batteries, and relates to a composite solid electrolyte and a preparation method thereof. The electrolyte comprises a polymer, a lithium salt, a flame retardant and an inorganic solid electrolyte, the mass ratio of the lithium salt to the polymer is (0.4-0.8): 1, the mass ratio of the flame retardant to the polymer is (0.2-0.5): 1, and the mass ratioof the inorganic solid electrolyte to the polymer is (5-50): 100. The electrolyte adopts an organic-inorganic composite structure, so that side reaction can be effectively avoided, the ionic conductivity of lithium ions is improved, the conductivity of the lithium ions at room temperature can reach 10<-4> Scm<1>, and an electrochemical stability window is about 5V. Besides, by adding the flame retardant, the electrolyte has the characteristic of non-combustibility, and the potential safety hazard of combustion and even explosion caused by preheating of the liquid electrolyte in the traditional lithium ion battery is avoided.

The invention provides a manufacturing method of a high-energy-density aluminum shell lithium ion battery, which comprises the following steps: S1, preparing a positive plate and a negative plate, assembling an aluminum shell battery, keeping insulation between the aluminum shell and the positive plate and the negative plate of the battery, and then injecting a pre-lithiation electrolyte into the aluminum shell battery; S2, connecting the aluminum shell with the positive electrode of an external power supply, connecting the negative plate with the negative electrode of the external power supply, and charging with small current for pre-lithiation; and S3, removing the pre-lithiated electrolyte, injecting a functional electrolyte, and then performing activation and sealing to obtain the high-energy-density aluminum shell lithium ion battery. According to the method, in-situ lithium pre-embedding of the negative electrode of the lithium ion battery can be accurately controlled, so that lithium consumption in the processes of negative electrode film forming and the like in the first-time charging process is compensated, gram volume exertion of the positive electrode material in the actual lithium ion battery is improved, and due to the fact that additional auxiliary electrodes or electrode materials do not need to be added in the lithium pre-embedding process, andoperation is simple and convenient. And the capacity and the energy density of the lithium ion battery can be improved.

The invention belongs to the technical field of batteries, and particularly relates to a preparation method of a metal lithium powder composite material, which comprises the following steps: obtaining an organic solution of metal lithium powder and a fluorinating reagent; and carrying out mixed reaction on the organic solution of metal lithium powder and a fluorinating reagent in an inert atmosphere at the temperature of 0-90 DEG C to obtain the metal lithium powder composite material. According to the preparation method of the metal lithium powder composite material, the preparation process is simple, the condition is mild, high-temperature calcination is not needed, water and oxygen are strictly controlled, the application flexibility of the preparation method is improved, and meanwhile the preparation safety is improved. The method has better application performance in the aspect of pre-lithiation reagents, can effectively improve the first effect of silicon-oxygen lithium ion batteries and the like, and does not affect the electrochemical performance of a battery system.

The invention discloses a lithium ion battery with high safety pole piece, including a housing, a bare battery core is arranged in the shell, the bare cell includes a cathode electrode sheet and an anode electrode sheet. The cathode pole piece and the anode pole piece are staggered or wound, an isolation film is arranged between the anode pole piece and the cathode pole piece, two sides of the anode pole piece or the cathode pole piece with one end of the pole ear and two sides of the opposite end of the pole ear are provided with a plurality of adhesive strips, and the adhesive strips and theadjacent isolation film are adhered and connected. The adhesive strips can be rapidly solidified at room temperature, melted when the high temperature fixture is formed and bonded to the insulating film under pressure. Bonding of the insulating film can prevent the short circuit of cathode-anode contact caused by the shrinkage of the insulating film at high temperature, thereby improving the safety performance of the cell. The invention is applied to the technical field of batteries.

The embodiments of the invention disclose a large-current printed circuit board and a machining method thereof. The large-current printed circuit board machining method may comprises the following steps: the slotting process is performed on a false layer to form a slot for accommodating a large-current conductor block; the large-current conductor block is placed in the slot; the false layer is laminated between a first sheet set and a second sheet set, wherein the first sheet set and/or the second sheet set comprises at least one layer of circuit pattern layer; and the large-current conductor block is in connection and conduction with the circuit pattern layer in the first sheet set and/or the second sheet set. According to the scheme of the embodiments of the invention, the PCB reliability can be improved, and the occupation of the large-current conductor block on the circuit layer wiring space can be reduced.

The preparation method specifically comprises the following steps: uniformly mixing a core-shell structure magnetic nano template which takes polyaniline as a shell and Fe3O4 as a core with a negative electrode material, a binder, a conductive agent and a solvent water to prepare negative electrode slurry, coating the surface of a current collector with the negative electrode slurry, and drying to obtain the lithium battery negative electrode plate. The preparation method comprises the following steps: preparing a thick electrode from magnetic nano Fe3O4, directionally assembling the magnetic nano Fe3O4 on the surface of a current collector by loading a magnetic field, recycling the magnetic nano Fe3O4 in the thick electrode through microwave heating and a magnetic recycling device, and constructing a three-dimensional network channel with high conductivity in the thick electrode to effectively improve the conductivity of the electrode, shorten ion and electron migration paths and improve the conductivity of the electrode. A multi-dimensional open permeation channel is provided, the wettability of an electrolyte is enhanced, the electrode tortuosity is reduced, the gradient porosity is generated, a molecular-level channel beneficial to lithium ion transportation is formed, and high-speed conduction of lithium ions is promoted.

The invention provides a safety diaphragm used for secondary cells, and a preparation method thereof. The safety diaphragm used for secondary cells possesses heat sealing performance and excellent permeability, and no bonding agent is used in the preparation method. the preparation method comprises following steps: preparation of a spinning solution, wherein at room temperature, a certain amount of a heat sensitive material is dissolved in a spinning solution as a spinning solute, and an obtained mixture is stirred to be uniform so as to obtain an electrostatic spinning solution; electrostatic spinning, wherein a high temperature resistant non-woven fabric diaphragm is taken as a base film, and electrostatic spinning of the electrostatic spinning solution onto the base film is carried out, wherein the temperature is room temperature, positive high voltage is controlled to be +5KV to +20KV, negative high voltage is controlled to be -1KV to -10KV, the left-right horizontal movement speed of a syringe is controlled to be 10 to 60mm*min<-1>, the rolling speed of a collector is controlled to be 10 to 60mm*min<-1>, the injection speed of the electrostatic spinning solution is controlled to be 0.02 to 0.5mm*min<-1>, and the collecting time is controlled to be 10 to 1200min, so that the safety diaphragm used for secondary cells is obtained via drying. The safety diaphragm used for secondary cells comprises the base film, and a spinning layer directly attached onto the base film.