9results about How to "Reduce capacity loss" patented technology

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 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.

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 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.