31results about How to "Low specific capacity" patented technology

The invention relates to a lithium titanate / titanium black anode material and a preparation method thereof belonging to the technical field of lithium ion batteries. The lithium titanate / titanium black anode material has a chemical formula of (1-0.8x)Li4Ti5O12-xTi4O7, wherein x is more than 0,03 and is not more than 0.30. The lithium titanate / titanium black anode material can be synthesized by adopting two methods, the first method is as follows: lithium titanate is carbonized in vacuum, a compact titanium black high-conductive membrane is formed on the surface of the lithium titanate through controlling temperature, reaction time and pressure to have higher multiplying power performance; and the second method is as follows: Ti4O7 is directly added in the lithium titanate, and the lithium titanate / titanium black anode material is synthesized under an inert atmosphere at high temperature. The lithium titanate / titanium black anode material has a simple manufacture process and is beneficial to industrialized production. Compared with the current marketized anode material, the lithium titanate / titanium black anode material has higher electrical conductivity and corrosion resistance and higher large-current discharge cycling performance; and multiplying power charge and discharge performances and cycling performance of a lithium ion power battery can be further improved.

The invention discloses a method for repair and regeneration of waste lithium iron phosphate battery cathode materials, which allows a lithium-source solution or a suspension to react with a recovered waste lithium iron phosphate battery material by a hydrothermal reaction or a solvent-thermal reaction, or allows the recovered waste lithium iron phosphate battery material to be processed by solid-phase ball-milling and calcination with the lithium source, performs liquid-phase or solid-phase direct lithium-supplementing repair of delithiated waste lithium iron phosphate, and then performs pertinent repair and regeneration by coating conductive agents or coating conductive agents and doping metal ions. The invention adopts a direct repair and regeneration method; the repaired waste lithium iron phosphate battery cathode material has excellent performance, and the specific capacity can reach above 90% of the specific capacity before discard; the method not only can effectively reduce environmental pollution of waste batteries, but also can make full use of waste resources and changes waste into valuables.

The invention discloses a negative electrode of a foamed copper oxide / copper lithium ion battery and a preparation process thereof, comprising the following steps: carrying out pickling treatment on the surface of the foamed copper, washing and drying it with water, and compacting it; The surface is oxidized in an air atmosphere heat treatment furnace to obtain a layer of copper oxide (CuO, Cu2O or a mixture of the two) on the surface; then the slurry obtained by mixing carbon-based conductive agent, binder and solvent Coating on the surface of the foamed copper oxide / copper composite material, drying and pressing. The three-dimensional structure copper oxide / copper material coated with a conductive agent and a binder on the surface can be directly used as a negative electrode of a lithium-ion battery, without the need for mixing active materials with a binder and a conductive agent in the traditional preparation of a negative electrode of a lithium-ion battery The process of making a slurry and coating it on a current collector. The coated conductive agent and binder can increase the electrical contact of the copper oxide active material during charging and discharging, and increase the electronic conductivity and the utilization rate of the active material. The negative electrode of the lithium ion battery of the invention has high specific capacity, good cycle performance, and the preparation method of the electrode is simple and easy to control, and is very suitable for the industrial application of the lithium ion battery.

The invention discloses an asymmetric supercapacitor based on 3DSG / Mn3O4 / 3DMG and a preparation method thereof. The asymmetric supercapacitor based on 3DSG / Mn3O4 / 3DMG comprises an anode, a cathode, electrolyte solution and a diaphragm. The anode is made of a 3DSG / Mn3O4 composite material. The cathode is also made of the 3DSG / Mn3O4 composite material. The electrolyte solution is sodium sulfate solution. The preparation method of the invention comprises the steps of preparing the 3DSG / Mn3O4 composite material of the anode, preparing the 3DSG / Mn3O4 composite material of the cathode, preparing the sodium sulfate solution as the electrolyte solution, and assembling the capacitor. The asymmetric supercapacitor and the preparation method do not require binder or conductive agent. Furthermore the asymmetric supercapacitor and the preparation method have advantages of high metal oxide utilization rate, high conductivity and high storage capability. The asymmetric supercapacitor can be used for preparing an energy storage element.

The invention discloses a hybrid doped polypyrrole paper-based flexible electrode material. The preparation steps include dissolving a certain amount of lignosulfonate and sodium anthraquinone-2-sulfonate in a certain amount of distilled water at the same time, Obtain a hybrid doping solution; disperse a certain amount of cellulose fiber in the hybrid doping solution, and place it in an ice-water bath. After mechanical dispersion, add a certain amount of pyrrole monomer, and after mechanical stirring for a certain period of time, add it dropwise The ferric chloride oxidizing agent solution initiates polymerization; after polymerization for a certain period of time, the product is filtered, washed and dried to obtain a hybrid doped polypyrrole paper-based flexible electrode material. The invention has the advantages of simple process, readily available raw materials, and is suitable for large-scale industrial production, and the prepared hybrid doped polypyrrole paper-based flexible electrode material has the characteristics of low cost and high specific capacity.

The invention provides a solid solution material and a preparation method thereof as well as a lithium ion battery containing the material, belongs to the technical method of the lithium ion battery, and solves the problems of low first coulomb efficiency or low specific capacity and poor circulating performance of the existing 0.5LiNi0.5Mn1.5O4*0.5Li2MnO3*0.5LiNi0.5Mn0.5O2 material and the lithium ion battery prepared from the material. The preparation method of the solid solution material disclosed by the invention comprises a step of nickel-manganese precursor preparation based on a co-precipitation method, a step of precursor pre-treatment and a step of solid phase synthesizing. The solid solution material with a good performance can be obtained through selecting suitable technical parameters so that the material and the lithium ion battery prepared from the material have high first coulomb efficiency, high specific capacity and good circulating performance.. The solid solution material prepared by the invention is prepared by the preparation method. The lithium ion battery disclosed by the invention comprises the solid solution material.

The invention provides a method for preparing a zinc-cobalt double metal oxide sandwich structure flexible film electrode, based on the vacuum filtration method, (1) dispersing cellulose nanofibrils and multi-walled carbon nanotubes in water, ultrasonic, magnetic Stir to obtain a uniform dispersion of cellulose nanofibrils-multi-walled carbon nanotubes; (2) disperse cellulose nanofibrils and zinc-cobalt double metal oxides in water, ultrasonically and magnetically stir to obtain uniform cellulose Nanofibril-zinc-cobalt double metal oxide dispersion; (3) cellulose nanofibril-multiwall carbon nanotube dispersion and cellulose nanofibril-zinc-cobalt double metal oxide dispersion are successively suction filtered Forming a film to obtain a flexible film electrode with a sandwich structure of coating layer-sandwich layer-coating layer-sandwich layer-coating layer. The invention aims to prepare a high-performance flexible and lightweight electrode material, which has broad application prospects in the fields of portable electronics and energy products.

The invention provides a potassium ion battery negative electrode active material, a potassium ion battery negative electrode material, a potassium ion battery negative electrode, a potassium ion battery and an application thereof, belonging to the technical field of potassium ion batteries. The potassium ion battery negative electrode active material provided by the invention comprises a ruthenium pentoxide composite material, wherein the ruthenium pentoxide composite material comprises a ruthenium pentoxide composite material containing a doping ions and / or a coating layer. The ruthenium pentoxide composite material has excellent potassium ion transport channels, can realize rapid insertion and de-intercalation of potassium ions, has stable crystal structure, adopts the reaction mechanism of intercalation and pseudocapacitance dual mechanism, prepares the potassium ion battery with the advantages of long cycle life, high specific capacity and low cost, can solve the problem of priceincrease caused by insufficient lithium resources, avoids the problems of expansion and pulverization of the alloy-type negative electrode of the potassium ion battery, slow dynamics of the intercalated carbon material and the like, and can be widely applied to electric tools, electronic equipment, electric vehicles or energy storage equipment.

The invention provides a method of preparing a TiO2 / SnO2 cathode material of a sodium ion battery by using a plasma electrolytic oxidation technique. An electrolyte is prepared from 1-10 ml / l phosphoric acid (85wt.%), 1-10 g / L sodium silicate, 5-30 g / L sodium stannate and 5-30 ml / L glycerol separately. The method comprises the following steps: by taking foamed titanium as an anode and stainless steel as a cathode, immersing the anode and the cathode into a special electrolyte solution containing phosphoric acid, sodium silicate, sodium stannate, glycerol and deionized water; applying a bipolarpulse voltage between the two electrodes at constant temperature and constant pressure, wherein plasma discharge happens on the surface of the foamed titanium; turning off a power supply after discharge for a period of time to prepare the TiO2 / SnO2 composite membrane on the surface of the foamed titanium. The composite membrane can be used as a cathode material of the sodium ion battery. The TiO2 / SnO2 cathode material makes full use of a high capacity characteristic and high cyclic stability of TiO2. The method is simple in preparation process, low in production cost and suitable for industrial production.

The invention discloses a preparation method of a lithium ferrous phosphate (LiFePO4) which is an anode active substance of a lithium-ion secondary battery. The method comprises the steps of: sintering a mixture containing a lithium compound, a ferro compound, a phosphorous compound and a carbon source additive in inert atmosphere, and then cooling the mixture to obtain sintering product, wherein, during sintering, the inert atmosphere is static and the pressure of the inert atmosphere is normal pressure. The LiFePO4 obtained by the preparation method does not contain Fe2P dephasign, and the batteries prepared by the LiFePO4 have high capacity, lower internal resistance and good cycle performance.