27results about How to "Reduce capacity loss" patented technology

The invention discloses a transition metal nitride and amorphous carbon composite coated and modified lithium manganese iron phosphate composite material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The vanadium nitride / amorphous carbon is adopted to perform composite coating modification on the lithium manganese iron phosphate material, so that the composite positive electrode material is more stable in structure. The use of vanadium nitride reduces the coating amount of carbon, and avoids the problems of coating layer thickening caused by high carbon content and Li < + > diffusion hindering caused by reduction of tap density of active substances. Vanadium nitride not only has good conductivity, but also has good Li < + > conductivity transmission performance, Li < + > de-intercalation can be rapidly achieved, the conductivity of the material is improved, meanwhile, a Li < + > diffusion channel on the surface of the positive electrode material is further dredged and increased, and the capacity loss of the modified material is reduced.

The embodiment of the utility model discloses a secondary battery and a battery pack, the secondary battery comprises an electrode roll formed by winding a first pole piece, a diaphragm and a second pole piece, and the diaphragm is arranged between the first pole piece and the second pole piece; one of the first pole piece and the second pole piece is a positive pole piece, the other one is a negative pole piece, the first pole piece comprises a first active layer, and the second pole piece comprises a second active layer; the electrode roll is provided with a flat part and bent parts located at the two opposite ends of the flat part, at least one of the first active layer and the second active layer is provided with a first groove located in the flat part, at least one of the first active layer and the second active layer is provided with a second groove located in the bent part, and notches of the first groove and the second groove located in the same active layer face the active layer of the adjacent pole piece; in the second direction, the size of the first groove is larger than that of the second groove. By adopting the structural design, the electrolyte infiltration time of the thick-coated pole piece can be shortened, the stress of the pole piece at the bending part can be reduced, and the low-temperature performance, the rate performance and the fast-charge cycle performance of the battery can be improved.

The invention provides a solid electrolyte membrane, a preparation method thereof and a solid-state battery, and relates to the technical field of energy storage. The preparation method of the solid electrolyte membrane comprises the steps that a second base material layer is formed on a first base material layer, a composite base material layer is prepared, the porosity of the second base material layer is smaller than that of the first base material layer, first powder is sprayed on the side, opposite to the second base material layer, of the first base material layer, pressing treatment is conducted, and the solid electrolyte membrane is formed. According to the preparation method of the solid electrolyte membrane, the pressing frequency is reduced, the density of the solid electrolyte membrane is improved, the production efficiency is improved, and the damage to the solid electrolyte membrane base material in the pressing process is reduced.

The invention relates to the technical field of batteries, in particular to a battery manufacturing process, a battery processing device, a battery and electric equipment.The battery manufacturing process comprises the steps that the battery to be processed is obtained, and liquid injection is conducted on the battery; the battery is charged before sodium in the battery is reduced at the negative electrode. Sodium in the battery is adopted to charge the battery before the negative electrode is reduced, and in the process of charging the battery, water can receive electrons at the negative electrode to generate a reduction reaction to generate hydrogen and hydroxyl, or water is decomposed in electrolyte to generate hydrogen ions, the hydrogen ions can receive electrons at the negative electrode to generate a reduction reaction to generate hydrogen, and the hydrogen ions can receive electrons at the negative electrode to generate hydrogen. Therefore, water in the battery can be removed, after water removal, sodium is reduced at the negative electrode to generate a sodium metal simple substance, the risk that the reduced sodium reacts with water is reduced, the loss of the battery capacity is reduced, and the cycle performance of the battery is improved.

The invention discloses a method for preparing an aluminum-fluorine co-doped positive electrode material by using a nickel-cobalt-manganese waste battery positive electrode material, which comprises the following steps: mixing and ball-milling a positive plate obtained by stripping from a nickel-cobalt-manganese waste battery and a lithium source (including lithium hydroxide) to obtain composite powder; and roasting the composite powder in a protective atmosphere to obtain the aluminum-fluorine co-doped positive electrode material. According to the method, the aluminum foil and the positive electrode material of the positive electrode plate do not need to be separated, a PVDF binder in the positive electrode material does not need to be removed, the process is very simple, the aluminum foil and PVDF of the positive electrode plate are effectively utilized and serve as an aluminum source and a fluorine source respectively, doping modification is achieved while the invalid nickel-cobalt-manganese positive electrode material is repaired, and the service life of the positive electrode plate is prolonged. The stability of the ternary lithium positive electrode material is improved, the capacity loss in the material cycle process is reduced, and the cycle performance of the material is improved.

The application discloses a kind of control area quick recovery method of non-count axis CBTC system, comprising: step S1, adjacent control area real-time intercommunication communication train and the position and route information of non-communication train;Step S2, after target control area restarts completion, the communication link with upstream control area and downstream control area is restored, and the tracking of communication train in this control area is restored;Step S3, based on the information of upstream control area and downstream control area synchronization, the total number of train in target control area and the number of non-communication train are calculated, and then the communication train and non-communication train in target control area are distinguished;Step S4, for the communication train that has been restored tracking, the route thereof is automatically restored according to the original route information synchronized;Step S5, for non-communication train that has not been restored tracking, the position thereof is preset as the envelope within the original route range, and the original route is restored after artificial confirmation.The application realizes the quick and accurate recovery of train position and route after control area restarts, and reduces the influence on operation.

The invention provides a battery, the working voltage of the battery is not lower than 4.5 V, the battery comprises an electrolyte, and the electrolyte comprises a first component and a second component; the first component comprises fluoroethylene carbonate; and the second component comprises a compound as shown in formula I: # imgabs0 #. The electrolyte provided by the invention can form a stable interfacial film, is low in interfacial resistance and high in conductivity, is not easy to decompose, and is beneficial to improving the stability of a positive electrode material and reducing the capacity loss of the positive electrode material, so that the cycle performance and high-temperature storage performance of the battery under a high-pressure condition are improved.

The invention provides a battery type lithium ion capacitor and electronic equipment. The battery type lithium ion capacitor comprises a negative plate; the negative plate comprises a negative current collector and a negative active layer arranged on at least one surface of the negative current collector; the negative electrode active layer comprises a negative electrode active material, the negative electrode active material comprises hard carbon and graphite, and the mass percentage content of the graphite in the negative electrode active material is 2-45%. According to the battery type lithium ion capacitor, the graphite in the negative plate can reduce the consumption of lithium ions when the battery type lithium ion capacitor is charged and discharged for the first time, the first charging and discharging efficiency of the battery type lithium ion capacitor is improved on the whole, the capacity loss of the battery type lithium ion capacitor in the charging and discharging process is reduced, and the energy density of the battery type lithium ion capacitor is improved.

The invention relates to a nickel-metal hydride battery electrolyte additive, an electrolyte and a nickel-metal hydride battery. The nickel-metal hydride battery electrolyte additive comprises micron-sized boehmite, and the concentration of the micron-sized boehmite in an electrolyte is 0.15 mol / L to 1 mol / L. According to the scheme provided by the invention, the electrolyte additive micron-sized boehmite can be combined with hydroxyl in the nickel-metal hydride battery electrolyte to form aluminum hydroxide, aluminum ions can enter the positive electrode to inhibit expansion and phase transformation of the positive electrode, and aluminum hydroxide can form an aluminum hydroxide passivation film on the surface of the positive electrode and the surface of the negative electrode respectively; the aluminum hydroxide passivation film on the surface of the negative electrode can play a role in isolating electrolyte from the negative electrode, reducing contact between the negative electrode and the electrolyte and inhibiting side reaction between the negative electrode and the electrolyte, so that capacity loss of the positive electrode and the negative electrode is slowed down, stability of the positive electrode and the negative electrode is improved, and long-term high-temperature floating charge performance of the nickel-metal hydride battery is improved; and the long-term high-temperature floating charge performance of the nickel-metal hydride battery can be obviously improved at relatively low cost.

The invention discloses a battery equalization control system and a control method, which are used for controlling an active equalization circuit and a passive equalization circuit to equalize at least two battery packs in the battery equalization system. The battery equalization control method comprises the following steps: acquiring single voltage and / or single residual electric quantity of each single battery in at least two battery packs; selecting to execute an active equalization algorithm or a passive equalization algorithm according to the difference value between the maximum single residual electric quantity and the minimum single residual electric quantity of the single batteries in each battery pack; and when the difference value corresponding to any battery pack is greater than a first threshold value, the active equalization algorithm is selected to be executed, and when the difference values corresponding to all the battery packs are smaller than or equal to the first threshold value, the passive equalization algorithm is selected to be executed, so that the problem of system oscillation caused by relatively large active equalization current can be reduced.

The invention relates to a solid electrolyte membrane, a preparation method thereof and a solid-state battery. The preparation method of the solid electrolyte membrane comprises the following steps: stacking a first base material layer and a second base material layer; spraying solid electrolyte powder to the surface of the first base material layer to obtain an electrolyte membrane precursor; pressing the electrolyte membrane precursor to obtain an intermediate; and removing the second base material layer in the intermediate to obtain the solid electrolyte membrane, wherein the first base material layer is of a porous structure, and the porosity of the second base material layer is smaller than that of the first base material layer. According to the preparation method of the solid electrolyte membrane provided by the invention, the porosity of the second base material layer is smaller than that of the first base material layer, and the second base material layer blocks the solid electrolyte during pressing treatment, so that the density of the solid electrolyte membrane is improved, the ionic conductivity of the solid electrolyte membrane is improved, and the cycle performance of a battery is improved; by removing the second base material layer, the thickness of the solid electrolyte membrane is reduced, and the energy density of the battery is improved.

The present invention discloses a lithium ion battery fast charging method based on multi-objective optimization, comprising the following steps: establishing a second-order RC equivalent circuit of a lithium ion battery, and deriving an electric-thermal-aging coupling model of the lithium battery during charging according to the equivalent circuit; according to the electric-thermal-aging coupling model, considering the charging time required for the SOC of the lithium battery to reach 90% during charging, the maximum temperature rise during charging, and the capacity loss under the condition of charging for thousands of cycles, establishing a multi-objective optimized fast charging objective function; according to the performance characteristics of the battery at different SOC stages, designing a multi-stage constant current charging method, optimizing the charging current sequence through a social network search algorithm, and obtaining the charging current sequence corresponding to the minimum cost function value. On the basis of meeting the demand for fast charging of lithium batteries, the present invention reduces the maximum temperature rise during charging and reduces the charging capacity loss of the battery.

The present invention belongs to the technical field of solid-state batteries, and discloses a composite solid electrolyte and a solid-state battery. The composite solid electrolyte includes a modified solid electrolyte layer on the positive electrode side and a modified solid electrolyte layer on the negative electrode side that are combined together. The modified solid electrolyte layer on the positive electrode side uses a heavy metal ion MOF material with a large radius to provide an additional path for lithium ion transmission, and can also stabilize the interface and reduce the formation of voids during the interface side reaction process. The modified solid electrolyte layer on the negative electrode side uses a light metal MOF material to protect the lithium metal surface, reduce the uncontrollable occurrence of side reactions, and the lower deposition potential of the light metal also reduces the capacity loss caused by excessive deposition of impurity metals. The addition of MOF materials in the solid electrolyte layers on the positive and negative electrode sides increases the mechanical strength of the membrane, reduces the crystallization phenomenon of long-chain polymers, and generally increases the ionic conductivity of the solid electrolyte, while stabilizing the reaction interface and increasing the cycle stability.

The invention provides an amorphous carbon material modified by an artificial SEI membrane as well as a preparation method and application of the amorphous carbon material, and belongs to the field of electrode material interface modification methods and material preparation. The preparation method of the amorphous carbon material modified by the artificial SEI membrane comprises the following steps: adding amorphous carbon into a nitric acid solution for heat treatment to obtain heat-treated amorphous carbon; mixing the heat-treated amorphous carbon with water to obtain a turbid liquid, and then adding a polymeric monomer and an alkali metal compound into the turbid liquid for dispersion treatment to obtain a dispersion system; and raising the temperature of the dispersion system, and then carrying out heat preservation treatment, so that the polymeric monomers are subjected to polymerization reaction to obtain the artificial SEI membrane modified amorphous carbon material. After the artificial SEI film is adopted for pre-modification, the sodium ion conducting capacity of the amorphous carbon material is improved, so that the capacity, the first coulombic efficiency and the rate capability of the sodium ion battery are improved.

This invention provides a hydrogen-bonded stable bipolar organic small molecule cathode material, its preparation method, and its application, comprising the following steps: weighing a conductive agent and a binder, adding a solvent, and grinding uniformly to obtain a slurry; uniformly coating the slurry onto a current collector; and drying to obtain the cathode material.

The invention discloses a negative current collector with a carbon-containing functional layer and a preparation method of the negative current collector, and relates to the technical field of current collectors. The negative current collector comprises a base material and a carbon-containing functional layer coated on the surface of the base material; the carbon-containing functional layer comprises the following raw materials in parts by weight: 40-50 parts of a carbon skeleton, 25-35 parts of a sodium-philic material, 18-24 parts of a binder and 0.5-2 parts of a surfactant; the binder is composed of a porous imidazolium-based binder and sulfonated-polyether ether ketone-Na in a mass ratio of (2-3): 1. According to the prepared negative electrode current collector, the energy density when the negative electrode current collector is used for a sodium ion battery is effectively improved, and risks caused by sodium dendrites generated by a negative electrode in the charging process are reduced.

The application belongs to the technical field of sodium ion battery cathode materials, and relates to an element non-uniform distribution P2 type layered oxide cathode material, a sodium ion battery, and a preparation method and application. Metal salt solution and doped element salt solution are simultaneously introduced into a reaction kettle in a series connection mode, and react with a mixed alkali solution to obtain an element non-uniform distribution precursor. Then, the element non-uniform distribution precursor is mixed with a sodium source and sintered to obtain the P2 type layered oxide cathode material. The metal salt includes at least one of MnSO4, NiSO4, CuSO4, CoSO4 and FeSO4. The doped element salt solution includes at least one of MgSO4 solution, ZnSO4 solution and Al2(SO4)3 solution. The application realizes the non-uniform distribution of high surface concentration and low body concentration of the doped element through series connection feeding, significantly improves the cycle stability under the premise of reducing the initial capacity loss. The method is simple in process, strong in controllability, and easy to mass produce.

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.

The utility model relates to battery technical field discloses a kind of winding type electric core and battery, winding type electric core has straightaway and circular arc area, winding type electric core includes polar plate and diaphragm of laminated and winding arrangement;Polar plate includes current collector and active layer, active layer is located at the at least one side of current collector, active layer includes circular arc segment and straightaway, circular arc segment is located in circular arc area, straightaway is located in straightaway, and circular arc segment is equipped with positioning groove;Winding type electric core further includes ion-conducting membrane, at least part of ion-conducting membrane is located in positioning groove, and ion-conducting membrane is arranged between polar plate and diaphragm.The utility model of winding type electric core is by being provided with positioning groove on polar plate, the relative position of ion-conducting membrane and polar plate is limited, so that ion-conducting membrane can continuously insulate the burr of the part of polar plate located in circular arc area, reduce the probability of battery self-discharge.

The invention discloses a method for predicting the flow condition of a carbon capture and storage pipeline conveying network. The method comprises the following steps: step 1, establishing a steady-state multi-component flow model; 2, processing nodes in the pipeline network; 3, numerical solution is carried out; and 4, calculating thermodynamics and transmission properties. According to the method, the flow condition in the whole pipeline network can be accurately predicted, and the height change of the pipeline and the periodic change of the flow at the source end which are ignored in the existing model are considered; secondly, the model of the invention can process different impurities and levels thereof in carbon dioxide flows from different sources, which is crucial to accurate prediction of the composition of finally conveyed carbon dioxide and fluid conditions, and is helpful to avoid the physical and chemical reaction problem of the pipeline caused by the impurities. Meanwhile, the problems of capacity loss and injectivity in the storage process are reduced, and the economical efficiency and feasibility of the CCS technology can be improved.

The present invention discloses a method for testing a storage medium, comprising: converting the storage medium into a single-layer storage mode; performing a read / write test on the storage medium in units of blocks, and marking a bad block with a bad block identifier; performing a read / write test in units of pages based on the bad block identifier, and marking a bad page with a first bad page identifier; converting the storage medium into a multi-layer storage mode; determining a single-layer storage bad page in the single-layer storage mode based on the first bad page identifier, and determining a target multi-layer storage page corresponding to the single-layer storage bad page in the multi-layer storage mode; performing a read / write test on the target multi-layer storage page in units of pages, and marking a multi-layer storage bad page in the target multi-layer storage page with a second bad page identifier. The present invention also discloses a testing device, a terminal, and a storage medium. The present invention can reduce the capacity loss caused by marking bad blocks while improving the efficiency of read / write tests.

The invention relates to a composite solid electrolyte membrane, a preparation method thereof and a secondary battery. The preparation method of the composite solid electrolyte membrane comprises the following steps: S1, preparing a composite base material layer, wherein the composite base material layer comprises a first base material layer and a second base material layer which are laminated; wherein the first base material layer and the second base material layer are both of a porous structure, the porosity of the first base material layer is larger than that of the second base material layer, and preparation raw materials of the second base material layer comprise polymer solid electrolyte; s2, spraying a first solid electrolyte to the surface of the first base material layer on one side, far away from the second base material layer, of the first base material layer, and filling to obtain a composite solid electrolyte precursor; and S3, carrying out pressing treatment on the composite solid electrolyte membrane precursor to obtain the composite solid electrolyte membrane. According to the preparation method of the composite solid electrolyte membrane, the composite solid electrolyte membrane still has relatively high density on the basis of ensuring relatively thin thickness, and has relatively high mechanical property and ionic conductivity.

The invention provides a high-voltage-resistant electrolyte and a lithium ion battery, and relates to the technical field of lithium ion batteries. The high-voltage-resistant electrolyte comprises a lithium salt, a solvent and an additive. The additive comprises a negative electrode film-forming additive and a high-pressure-resistant additive. The solvent comprises a fluorinated solvent and other solvents. The fluorinated solvent is selected from one or more of fluoroethylene carbonate, fluoromethyl ethyl carbonate and fluorodiethyl carbonate. The battery prepared from the high-voltage-resistant electrolyte provided by the invention still has relatively high discharge energy under the condition of high voltage.

The invention relates to a composite solid electrolyte membrane, a preparation method thereof and a solid-state battery. The preparation method comprises the following steps: stacking the first base material layer and the second base material layer to prepare the composite base material layer; wherein the first base material layer and the second base material layer are both of a porous structure, and the porosity of the first base material layer is smaller than that of the second base material layer; pressing a second solid electrolyte raw material into the porous structure of the second base material layer; wherein the second solid electrolyte raw material comprises a second solid electrolyte; pressing a first solid electrolyte raw material into the porous structure of the first base material layer on one side, far away from the second base material layer, of the first base material layer to prepare a composite solid electrolyte membrane; wherein the first solid electrolyte raw material comprises a first solid electrolyte. According to the preparation method of the composite solid electrolyte membrane provided by the invention, the porosity of the composite solid electrolyte membrane is reduced, the ionic conductivity of the composite solid electrolyte membrane is improved, the internal resistance of the battery is reduced, and the cycle performance of the battery is improved.

The invention relates to the technical field of electrolyte additives, in particular to a preparation method of a silane modified zirconium phosphate electrolyte additive, which comprises the following steps: S1, introducing a zirconium source and a phosphorus source into a high-pressure synthesis kettle, fully stirring and mixing, and carrying out hydrothermal reaction to obtain nano zirconium phosphate; s2, dispersing the nano zirconium phosphate of the adjusting mechanism obtained in S1 into absolute ethyl alcohol, then introducing into a main chamber of a surface modification device, and adding a silane coupling agent into the main chamber of the adjusting mechanism, so that the mixed solution is preliminarily mixed in the main chamber of the adjusting mechanism; s3, after preliminary mixing, modifying the mixed solution at the bottom of the main chamber of the adjusting mechanism in an acoustoelectric coupling module of the adjusting mechanism under the combined action of an electric field and ultrasound; s4, after modification is completed, the silane modified zirconium phosphate electrolyte additive is obtained. The preparation method provided by the invention can efficiently and stably obtain silane modified zirconium phosphate of which the surface hydroxyl coverage rate is greatly reduced, and has good application value.

This invention provides a solid-state cathode, its preparation method, and a solid-state battery, relating to the field of battery technology. The solid-state cathode includes a cathode current collector, an upper cathode active material layer, and a lower cathode active material layer. The upper and lower cathode active material layers have thinned portions with an inclination angle of 2-20° around their perimeters. A filling portion is formed by the vertical surface of the side edge of the upper cathode active material layer, the extended surface of the top surface of the upper cathode active material layer, and the thinned surface of the thinned portions. Similarly, a filling portion is formed by the vertical surface of the side edge of the lower cathode active material layer, the extended surface of the bottom surface of the lower cathode active material layer, and the thinned surface of the thinned portions. A first electrolyte layer with a length of 0.3-5 mm is disposed within the filling portion. The first electrolyte used to form the first electrolyte layer has a Young's modulus of 90-165 GPa. The solid-state cathode can avoid battery short circuits, reduce battery capacity loss, and improve battery production yield and lifespan.

The invention discloses a high-power energy storage device grouping method in the technical field of energy storage device grouping, which comprises the following steps of: 1, discharging an energy storage device Ni at 1C to a lower use limit, then charging the energy storage device Ni at constant current and constant voltage of 5C to 10C to a charging upper limit, and then measuring the internal resistance Ri of the energy storage device Ni; 2, after the internal resistance is measured, discharging to a lower discharge limit at a large current of more than 10C, and recording a discharge capacity Ci, a voltage Vi-0 at the end of the discharge and a rebound voltage Vi-5 in the 5th second after the end of the discharge; and 3, the internal resistance, the discharge capacity and the rebound voltage are dimensionless, specifically as follows: # imgabs0 #, and {Ri} max ({Ci} max, {Vi-5} max) and {Ri} min ({Ci} min, {Vi-5} min) are respectively the maximum value and the minimum value of the internal resistance Ri (the large-current discharge capacity Ci and the rebound voltage Vi-5) of the energy storage device. And 4, after dimensionless processing, selecting the energy storage devices falling in a certain interval for matching. The method provided by the invention can effectively prolong the cycle life of the assembled energy storage device.