20results about How to "Improve rate discharge performance" patented technology

The invention belongs to the technical field of batteries, and provides an all-carbon-coated positive electrode material and a preparation method and application thereof, the preparation method comprises the following steps: in a vacuum negative pressure environment, mixing a positive electrode material, water and a water-soluble polymer to obtain a gel mixture, and then drying and carbonizing to obtain the all-carbon-coated positive electrode material. According to the invention, the water-soluble polymer is adopted as a carbon-coated precursor, and the water-soluble polymer completely coats the positive electrode material from inside to outside through a vacuum negative pressure method, so that the complete construction of an electronic conductive network from inside to outside can be completed after carbonization, and compared with the surface carbon coating of traditional micromolecule glucose and / or the mixing coating of a conductive carbon material, the preparation method has the advantages that the preparation process is simple, and the cost is low. The water-soluble polymer subjected to high-temperature carbonization can realize seamless coating of the positive electrode material, the conductivity of a material interface can be remarkably enhanced, and the problems of poor cycle performance, oxygen evolution and the like caused by untight coating or microcracks of a carbon material of the lithium-rich manganese-based positive electrode material are solved.

The invention relates to the technical field of lithium ion batteries, in particular to a low-temperature high-power lithium ion battery. According to the scheme, a negative electrode material adopts a forged needle coke secondary particle graphite liquid-phase carbon coating design, and a coating layer capable of rapidly diffusing L < i + > is introduced on the surface of graphite, so that rapid transmission from the surface to the inside is achieved, and the lithium ion battery has high power; and moreover, a fast ion channel is strictly controlled by a coating material, so that the contents of impurities and foreign matters are controlled, a transmission channel of the L < i + > is prevented from being blocked, the rate and low-temperature high-rate discharge performance of the battery are improved, the fast charge-discharge capability of the battery is enhanced, and the requirement of high-power application in a low-temperature environment is met. By optimizing the electrolyte formula and the additive and the coating design of the modified negative electrode material, a stable solid electrolyte interface layer (SE I) film can be formed, unstable growth of the SE I film is inhibited, the cycle life of the battery is prolonged, and the safety is improved.

The invention relates to the technical field of first charging and discharging of lithium batteries, and particularly discloses a preparation method of a positive electrode material for improving first charging and discharging of a lithium battery. Comprising the following operation steps: S1, adding LiOH, FeSO4. 7H2O and H3PO4 into deionized water, uniformly mixing, and baking to obtain an LFP precursor; s2, fully and mechanically mixing the LFP precursor, a carbon source, Nb2O5 and the single-layer Ti < 3 > C < 2 > MXene material, and calcining to obtain a modified LFP material; and S3, uniformly mixing the modified LFP material, a binder and a conductive agent, coating an aluminum foil with the mixture, and drying to obtain the positive electrode material.

In order to overcome the problems of insufficient ion conduction efficiency and interface side reaction between the existing sulfide solid electrolyte and a positive electrode, the invention provides a solid-state battery and a preparation method thereof, and the solid-state battery comprises a positive electrode plate and a negative electrode assembly which are stacked in sequence, the positive plate comprises a positive current collector and a positive material layer arranged on the surface of the positive current collector, the negative assembly comprises a negative plate, a sulfide electrolyte layer and a polymer electrolyte layer, the sulfide electrolyte layer is located on the surface of the negative plate, and the polymer electrolyte layer is located on the surface of the sulfide electrolyte layer. A corrugated groove is formed in the surface, deviating from the negative plate, of the sulfide electrolyte layer, the polymer electrolyte layer is located in the corrugated groove, and the polymer electrolyte layer abuts against the positive electrode material layer and partially permeates into the positive electrode material layer.

The application discloses a high-rate valve-regulated lead-acid battery and a preparation method thereof. The battery comprises a battery shell, a positive plate, a negative plate and an electrolyte arranged in the battery shell. The positive plate and the negative plate are both honeycomb lattice structure plates, and the positive plate is coated with a positive active material, and the negative plate is coated with a negative active material. The components of the positive active material include lead powder, graphite, sulfuric acid, nano lead dioxide and pure water. The components of the negative active material include lead powder, barium sulfate, sodium lignosulfonate, graphene composite additive and carbon black. The discharge rate of the high-rate valve-regulated lead-acid battery can reach 3-5C, and the discharge capacity retention rate is above 95% under the 1C discharge rate, which can meet the demand of 5G base stations, data centers and other fields for instantaneous large current and high power output.

This invention belongs to the field of lithium battery material technology, specifically relating to a metal oxide / mesoporous manganese dioxide / conductive polymer composite material, its preparation method, and its application. The preparation method includes the following steps: 1) ball milling a commercial metal oxide; 2) mixing the metal oxide powder with an organic polymer monomer and a methyl orange solution and ultrasonically dispersing the mixture to obtain a liquid mixture; 3) adding a potassium permanganate solution to the liquid mixture and performing a high-pressure hydrothermal reaction under stirring to obtain the composite material; 4) subjecting the composite material to alkali treatment, filtering, washing with water, and drying to obtain the metal oxide / mesoporous manganese dioxide / conductive polymer composite material. This metal oxide / mesoporous manganese dioxide / conductive polymer composite material can be used to prepare lithium battery cathode materials with high specific capacity, high conductivity, and high stability in a simple, efficient, and low-cost manner. It is easy to industrialize and solves the problems of low conductivity and poor rate discharge performance of traditional metal oxide cathode materials.

The invention discloses a cylindrical lithium battery and a preparation method thereof, the cylindrical lithium battery comprises a battery shell, a battery cap, a battery cell and an electrolyte, the battery cell is composed of a positive electrode, a negative electrode and a diaphragm, and an active material of the positive electrode is a coated high-nickel transition metal oxide material; the active material of the negative electrode is graphite, the negative electrode contains a first coating and a second coating, and a third coating-metal lithium layer is formed inside and on the surface of the second coating of the negative electrode when the battery is charged to be between the first voltage U1 and the second voltage U2; the first coating is made of a graphite material, and the second coating is made of a porous conductive material; the first voltage U1 ranges from 3.85 V to 4.00 V, and the second voltage U2 ranges from 4.1 V to 4.3 V. The lithium battery provided by the invention has the dual advantages of low self-discharge rate of a lithium primary battery and high-power discharge of a lithium ion battery, and the preparation method is simple to operate, does not increase additional treatment procedures, and almost has no influence on the battery cost.

The present application discloses a method for preparing a lithium-ion battery separator and the separator and application thereof, belonging to the field of battery materials. The method comprises the following steps: adding a phase transfer catalyst to an aqueous solution containing a polymer with an ultra-high degree of polymerization for reaction, then mixing with acrylonitrile to obtain a mixed system, performing an electrocatalytic etherification reaction under the catalytic conditions of a platinum-palladium catalytic electrode, precipitating, filtering, drying, dissolving, spinning, and obtaining the lithium-ion battery separator. The prepared separator has extremely strong electrolyte wettability, and the separator prepared by the electrostatic spinning process has an excellent pore structure, improves the transmission speed and migration number of lithium ions, induces uniform deposition of lithium ions, effectively inhibits dendrite growth, improves battery rate discharge performance and high rate cycle performance, improves the electrochemical performance and cycle life of lithium-ion batteries, and the separator has huge application potential in the field of lithium-ion battery separators.

The invention provides a lithium-rich manganese-based positive electrode material subjected to hydrothermal auxiliary post-treatment as well as a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The lithium-rich manganese-based positive electrode material disclosed by the invention is obtained by carrying out surface modification on lithium-rich manganese-based oxide powder by utilizing polyethylene glycol by adopting a hydrothermal auxiliary post-treatment method, the technical problem of poor rate capability of the lithium-rich manganese-based oxide can be effectively solved, and the preparation method of the lithium-rich manganese-based positive electrode material is simple; the polyethylene glycol material used in the preparation process is easy to obtain and low in cost, only 200 DEG C hydrothermal treatment and 400 DEG C sintering in a short time are needed in the preparation process, the energy consumption in the preparation process is low, and the material treatment process is simple and easy to reproduce repeatedly. The prepared lithium-rich manganese-based positive electrode material can effectively improve the specific capacity, the first coulombic efficiency and the cycling stability of a lithium ion battery, also shows excellent rate discharge performance, and has a wide commercial prospect.

This invention discloses a lithium-sulfur battery binder, its preparation method, and its application, belonging to the field of lithium-ion battery technology. The binder is prepared by grafting polyvinyl alcohol (PVA) with 3-(3,4-dihydroxyphenyl)-DL-alanine (DOPA) onto the PVA molecular chain, with a molar ratio of (0.9~1.2):(0.2~1). This invention, through directional molecular structure design of the binder, simultaneously achieves rapid lithium-ion conduction, improved electrochemical reaction kinetics, and optimized electrode mechanical structure stability, solving the industry problem of traditional lithium-sulfur battery binders' single-performance limitations and inability to meet multiple electrode requirements. The preparation method employs a controllable grafting reaction to functionalize the binder's polymer backbone, introducing sufficient polar functional groups and lithium-ion conduction active sites onto the molecular chain. This balances the stability of the polymer chain's cross-linking structure with electrode interface affinity, synergistically improving interfacial ion transport efficiency. The binder provided by this invention has broad application prospects in lithium-sulfur batteries.

The present invention belongs to the field of battery technology. The present invention provides a full carbon coated positive electrode material and a preparation method and use thereof. The preparation method comprises mixing a positive electrode material, water and a water-soluble polymer under a vacuum negative pressure environment to obtain a gel-like mixture, and then drying and carbonizing to obtain a full carbon coated positive electrode material. The present invention uses a water-soluble polymer as a carbon coating precursor, and completes the full coating of the positive electrode material from the inside to the outside by the water-soluble polymer through a vacuum negative pressure method, so that after carbonization, the electronic conductive network can be fully constructed from the inside to the outside. Compared with the surface carbon coating of traditional small molecule glucose and / or the mixed coating of conductive carbon materials, the water-soluble polymer after high temperature carbonization in the present invention can achieve seamless coating of the positive electrode material, can significantly enhance the conductive performance of the material interface, and solve the problems of poor cycle performance and oxygen precipitation caused by loose coating or microcracks of carbon materials in lithium-rich manganese-based positive electrode materials.

The application discloses a kind of fast charging sodium ion battery hard carbon negative electrode material and preparation method thereof, its preparation method includes the following steps: S1, pretreatment: hard carbon raw materials are broken and sieved, and the hard carbon raw materials with particle size less than 3cm are obtained;S2, low-temperature carbonization: the hard carbon raw materials obtained in step S1 are low-temperature carbonized, and the hard carbon precursor is obtained;S3, crushing and shaping: the hard carbon precursor obtained in step S2 is crushed and treated, and the hard carbon precursor powder is obtained by crushing D50 to 3-200 μm;S4, wet grinding: the hard carbon precursor powder obtained in step S3 is wet sand ground to D50 0.1-3 μm, and the sand grinding slurry is obtained;S5, spray drying: the sand grinding slurry obtained in step S4 is spray dried, and the carbon intermediate is obtained;S6, high-temperature carbonization: the carbon intermediate obtained in step S5 is high-temperature sintered, and the fast charging hard carbon negative electrode material is obtained.The application has the characteristics of good rate performance, excellent fast charging performance and high cycle stability.

The present invention belongs to the field of preparation of negative electrode materials for sodium ion batteries, and discloses a hard carbon material, a preparation method and an application as a negative electrode material for sodium ion batteries. The method comprises: shearing and pulverizing waste cotton cloth to obtain cotton cloth fragments; ball milling pretreatment of the cotton cloth fragments to obtain cotton fiber powder material; and carbonizing the cotton fiber powder material under an inert atmosphere to obtain a hard carbon material. The present invention modifies the structure of waste cotton fibers through ball milling technology, so that a hard carbon material with high first charge and discharge efficiency, good cycle stability and excellent rate discharge performance can be prepared through a one-step low-temperature carbonization treatment.

The application discloses a secondary electrolyte injection method and an alkali metal ion battery thereof, and the secondary electrolyte injection method comprises the following steps: injecting a first electrolyte into a semi-finished product battery cell and sealing, aging, standing and forming, wherein the first electrolyte comprises an electrolyte salt, a non-aqueous solvent and a basic additive; continuously injecting a second electrolyte, and obtaining an alkali metal secondary battery after secondary sealing and capacity distribution; the second electrolyte comprises the first electrolyte, a first additive and a second additive; the first additive is lithium fluorosulfonate or sodium fluorosulfonate, and the second additive is at least one of a fluorine-containing pyridine compound shown in the following formula (I) or a fluorine-containing imidazole compound shown in the following formula (II), and the specific structure is referred to the description. Through the secondary injection of the first additive and the second additive, the high-temperature cycle performance, the high-temperature storage performance and the low-temperature cycle performance of the battery can be improved, the rate discharge performance of the battery is improved, and the power of the battery is improved.

The invention belongs to the technical field of electrochemistry, and relates to a secondary battery and an electronic device comprising the same. The secondary battery comprises a positive electrode, a negative electrode, an isolating membrane and an electrolyte, a negative electrode active material of the negative electrode comprises a silicon carbon material; the electrolyte comprises ethyl propionate and propyl propionate, based on the total mass of the electrolyte, the mass percentage content of the ethyl propionate is a%, the mass percentage content of the propyl propionate is b%, and a / b is larger than or equal to 1.7 and smaller than or equal to 5.7; the electrolyte also comprises at least one of vinylene carbonate, boron-containing lithium salt and a compound with a structural formula as shown in a formula I; and in the formula I, A is selected from alkylene groups of C2 to C5. According to the secondary battery, the used electrolyte system is improved, so that gas generated by the secondary battery containing the electrolyte system at a high temperature is reduced, and the high-rate discharge performance of the secondary battery is further improved.

This invention discloses a high-power battery integrating a radioactive structure and a multi-element corrosion-resistant alloy, belonging to the field of lead-acid battery technology. It constructs a core component integrating a radioactive grid structure and a multi-element corrosion-resistant alloy. The radioactive grid adopts a centrally radiating structure, with 8-12 variable cross-section radial grid bars and 3-4 rings of progressively spaced annular grid bars forming a closed conductive network. The multi-element alloy is composed of Pb 98.5%-99.2%, Sn 0.3%-0.8%, Ag 0.05%-0.1%, Ca 0.06%-0.12%, and Al 0.03%-0.05%, with precise matching between composition and structure. The battery is manufactured through medium-frequency induction melting, controlled-cooling grid forming, stepped heat treatment, and optimized assembly processes. The battery has a C10 capacity of not less than 100Ah, a P15min discharge time of not less than 15min, a cycle life of not less than 780 cycles, a grid corrosion rate of not more than 0.023mm / a, and an energy utilization rate of not less than 87%. This design overcomes the performance bottleneck of traditional grid-alloy separation designs, combining high power, long lifespan, and high stability.

The present invention belongs to the technical field of positive electrode materials for lithium-ion batteries, and provides a method for preparing a high-capacity and long-life lithium manganese oxide positive electrode material. The preparation method comprises the following steps: mixing a lithium source, an additive and a mixed manganese source to obtain a lithium manganese oxide precursor, and subjecting the lithium manganese oxide precursor to a single sintering treatment to obtain a high-capacity and long-life lithium manganese oxide positive electrode material. The preparation method provided by the present invention does not require special crushing equipment and processes, reduces the manufacturing difficulty and processes, and greatly reduces the manufacturing cost of the lithium manganese oxide material. The prepared lithium manganese oxide positive electrode material has both high tap and compaction density and the advantages of high capacity and long cycle life.

The utility model discloses a high-magnification and high-capacity battery adopting a foam current collector. The high-magnification and high-capacity battery comprises a shell, a positive pole piece, a negative pole piece, electrolyte and a diaphragm, the positive pole piece and the negative pole piece are arranged on the shell, and an electrolyte and a diaphragm are arranged in the shell; the positive pole piece and / or the negative pole piece comprises a foamed three-dimensional pore structure current collector and an active substance filled in three-dimensional pores of the foamed three-dimensional pore structure current collector. The foamed current collector is used and comprises the positive electrode current collector and the negative electrode current collector, so that the energy density can be greatly improved under the condition of the same rate discharge capacity, and the rate discharge performance can be greatly improved under the condition of keeping the same energy density.

The invention relates to an electrolyte, an electrochemical device and an electronic device. Wherein the electrolyte comprises a substance A, a substance B and a substance C, the substance A comprises 1-propylene-1, 3-sultone and / or tripropyne phosphate, and the substance B comprises vinylene carbonate and / or dimethyl sulfone. The substance C comprises dimethyl 1-dodecyl-3-methyl-imidazole phosphate, dimethyl 1-tetradecyl-3-methyl-imidazole phosphate, dimethyl 1-hexadecyl-3-methyl-imidazole phosphate, dimethyl 1-octadecyl-3-methyl-imidazole phosphate, dimethyl 1-dodecyl-3-methyl-imidazole phosphate or dimethyl 1-octadecyl-3-methyl-imidazole phosphate or dimethyl 1-octadecyl-3-methyl-imidazole phosphate, dimethyl 1-octadecyl-3-methyl-imidazole phosphate, dimethyl 1-octadecyl-3-methyl-imidazole phosphate, dimethyl 1-octadecyl-3-methyl-imidazole phosphate or dimethyl 1-octadecyl-3-methyl-imidazole phosphate or dimethyl 1-octadecyl-3-methyl-imidazole phosphate. The catalyst is selected from at least one of 2, 3-dimethyl imidazole dimethyl phosphate. The substance A, the substance B and the substance C in the electrolyte have a synergistic effect, so that the floating charge capacity retention rate can be improved, the floating charge thickness swelling rate can be reduced, and the low-temperature high-rate discharge performance can be improved.

The present application relates to an electrolyte, an electrochemical device and an electronic device. Among them, the electrolyte includes substance A, substance B and substance C, substance A includes 1-propylene-1,3-sultone and / or tripropynyl phosphate, and substance B includes vinylene carbonate and / or dimethyl sulfone. Substance C includes at least one of 1-dodecyl-3-methyl-imidazole dimethyl phosphate, 1-tetradecyl-3-methyl-imidazole dimethyl phosphate, 1-hexadecyl-3-methyl-imidazole dimethyl phosphate, 1-octadecyl-3-methyl-imidazole dimethyl phosphate, 1-dodecyl-3-methyl-imidazole diethyl phosphate or 1,3-dimethylimidazole dimethyl phosphate. There is a synergistic effect between substance A, substance B and substance C in the electrolyte of the present application, which can improve the floating charge capacity retention rate, reduce the floating charge thickness expansion rate, and take into account the improvement of low temperature and high rate discharge performance.