14results about How to "Facilitate de-intercalation" patented technology

The invention discloses a battery negative electrode material and a preparation method thereof, and relates to the technical field of batteries. The battery negative electrode material comprises an inner core, a titanium dioxide coating layer coated on the surface of the inner core, a lithium titanate coating layer coated on the surface of the titanium dioxide coating layer, a carbon coating layer coated on the surface of the lithium titanate coating layer and a polymer coating layer coated on the surface of the carbon coating layer, the inner core comprises a silicon-based negative electrode material; the polymer coating layer comprises at least one of polyaniline, polythiophene and polypyrrole. Under the action of the four coating layers, the integrity of the silicon-based negative electrode material can be kept, direct contact between the silicon-based negative electrode material and an electrolyte is avoided, side reactions are reduced, the capacity fading of the battery in the charge-discharge cycle process is reduced, and the rate capability and the cycle stability of the battery are improved.

The invention belongs to the technical field of new energy materials, and particularly relates to a secondary battery and electric equipment. Compared with the prior art, by selecting the first active substance and the second active substance with specific compositions and matching with the arrangement of the first coating and the second coating, the energy density of the battery can be improved, and the first coulombic efficiency and the cycle performance can be improved. Specifically, a soft carbon and hard carbon composite material is matched with a graphite coated hard carbon material, so that the energy density can be improved; the first element and the second element are adopted to dope the active substance, so that the conductivity of the negative electrode plate can be improved, the ion diffusion kinetics is improved, and the de-intercalation of sodium ions is facilitated; meanwhile, the arrangement of the double active material coatings is adopted, so that the ion diffusion efficiency can be improved, the de-intercalation of sodium ions is accelerated, the first coulombic efficiency is improved, and the cycle performance of the battery is improved.

The application discloses a preparation method of a closed micropore structure sodium ion battery negative electrode hard carbon material, and comprises the following steps: S1, preparation of a precursor mixed solution: biomass raw material powder and an inorganic acid pore former are used to prepare the precursor mixed solution; S2, carbon precursor drying: the precursor mixed solution is dried to prepare the carbon precursor; S3, pore forming of a closed pore carbon intermediate: the carbon precursor is subjected to high-temperature activation reaction to obtain the closed pore carbon intermediate with a micropore structure after activation; S4, closed pore carbon intermediate refining treatment: the carbon intermediate is crushed and refined, and the refined closed pore carbon intermediate is obtained through sieving; and S5, high-temperature carbonization of the hard carbon material: the refined carbon intermediate obtained in the step S4 is subjected to high-temperature carbonization to obtain the hard carbon material with the closed micropore structure. The application has the characteristics of a green and environment-friendly process, a small specific surface area and excellent electrochemical performance.

The invention provides a preparation method and application of a lithium iron titanate / carbon quantum dot composite material, and belongs to the technical field of electrochemical energy storage. The preparation method comprises the following steps: uniformly mixing anatase and sodium hydroxide, and carrying out ultrasonic treatment and hydrothermal activation; repeatedly centrifuging the activated product sodium titanate and adding deionized water until the supernate is neutral, and drying to obtain a pickling product; the acid pickling product is ground, sieved and calcined to obtain bronze phase TiO2 (B); the preparation method comprises the following steps: by taking citric acid as a chelating agent, dissolving CH3COOLi. 2H2O, FeCl2. 4H2O, TiO2 (B) and carbon quantum dots in absolute ethyl alcohol, carrying out water bath stirring to obtain gel, carrying out vacuum drying and sieving, and calcining in an inert atmosphere to obtain a pre-sintered material; and sequentially carrying out ball milling and sieving on the pre-sintered material, and carrying out final sintering in an inert atmosphere to obtain the Li2FeTiO4 / carbon quantum dot composite material. The carbon quantum dots and the lithium iron titanate are compounded to form the lithium ion battery positive electrode composite material with enhanced electrochemical performance, and the preparation process is simple, low in cost and suitable for large-scale commercial production.

The application belongs to the technical field of new energy materials, and particularly relates to a secondary battery and an electric device. Compared with the prior art, the application can improve the energy density of the battery, and improve the first coulomb efficiency and the cycle performance by selecting the first active material and the second active material with a specific composition, and cooperating with the settings of the first coating and the second coating. Specifically, the energy density can be improved by using a soft carbon hard carbon composite material in combination with a graphite coated hard carbon material; the conductivity of the negative electrode sheet can be improved, the ion diffusion dynamics can be improved, and the sodium ion deintercalation can be facilitated by doping the active material with the first element and the second element; and the ion diffusion efficiency can be improved, the sodium ion deintercalation can be accelerated, the first coulomb efficiency can be improved, and the battery cycle performance can be improved by using the settings of the double active material coating.

The application relates to a polyionic liquid binder suitable for vulcanized polyacrylonitrile and a preparation method and application thereof, which is obtained by carrying out an alkylation reaction and a polymerization reaction on bromo-n-butane and 1-vinylimidazole, and then carrying out an anion exchange reaction on lithium bis(trifluoromethylsulfonyl) imide and sodium anthraquinone-2-sulfonate. The polyionic liquid binder can anchor polysulfide on the polymer chain through the electrostatic interaction between the lone pair electrons in the molecular chain and the polysulfide, effectively inhibits the shuttle effect, contains a quinoid structure which can act as a redox medium to accelerate the electron transfer process and improve the interface kinetic performance of the SPAN positive electrode, has excellent bonding performance and mechanical strength, can significantly improve the structural integrity and electronic conduction continuity of the electrode in the cycle process, and prolongs the cycle life of the electrode. The obtained binder can be widely applied to SPAN-based positive electrodes of lithium ion batteries and provides effective technical support for solving key problems such as volume expansion and poor conductivity of SPAN materials.

The application discloses a preparation method of a regenerated in-situ doped positive electrode material, and comprises the following steps: (1) adding waste lithium ion battery positive electrode material into a mixed solution of 2-hydroxypropionic acid and quinic acid to perform a first reaction; (2) adding a solution of glucosamine and / or aminobutyric acid into the system after the first reaction to perform a second reaction, thereby obtaining a leaching solution rich in valuable metal ions; (3) adjusting the molar ratio of the valuable metal ions and M 2+ , adjusting the pH, and heating and evaporating and concentrating to form a gel; the ionic radius of M 2+ is 1.3-2.0 times the average ionic radius of Ni 2+ , Co 2+ , and Mn 2+ ; (4) performing step-by-step calcination on the gel to obtain a primary regenerated material doped in-situ; and (5) spraying and pyrolyzing the primary regenerated material in a surface treatment agent and then performing low-temperature heat treatment. The application further provides a regenerated in-situ doped positive electrode material.

The application discloses an organic matter intercalated vanadium pentoxide (V2O5) positive electrode composite material and a preparation method and application thereof, and belongs to the technical field of micro-nano materials and electrochemistry. The application uses V2O5 with a wide source as a raw material, and uses bis(4-nitrophenyl) phosphate, diphenyl phosphate, ethyl phosphate and triethyl phosphate as objects to be inserted into adjacent layers of the V2O5 to serve as a support. The application not only improves the interlayer spacing of the V2O5, overcomes the problem that zinc ions are difficult to be deintercalated in the interlayer of the V2O5 in a cycle process, but also improves the structural stability, and improves the capacity and cycle stability.

This application relates to a cathode material and its preparation method, and a lithium-ion battery. The cathode material includes a substrate and at least a coating layer disposed on the surface of the substrate. The general chemical formula of the substrate is formula (I): Li a Ni b Co c N d M 2 e In formula (I) of O2(Ⅰ), N includes Mn and / or Al, M 2 It includes at least one of Zr, Sr, Co, Ba, Y, Ce, Al, Mg, and La; the general chemical formula of the coating layer is shown in formula (II): Li g M 1 (2h‑g) / i O h In equation (II), M 1 Including at least one of Mn, Ti, W, Mo, and Nb; in the diffraction pattern obtained by X-ray diffraction measurement of the cathode material, the cathode material has a diffraction peak 2θ on the (102) plane. 102 The diffraction peak 2θ of the (006) plane 006 The diffraction peak 2θ of the (110) plane 110 The diffraction peak 2θ of the (108) plane 108 ,2θ 102 2θ 006 2θ 110 and 2θ 108 Satisfy the following relationship: 2θ 102 -2θ 006 ≥0.25, 2θ 110 -2θ 108 ≥0.33.

The present invention discloses a solid electrolyte modified by a Schiff base metal nanocomplex and a preparation method thereof; the preparation method comprises the following steps: ball milling the Schiff base metal nanocomplex and the solid electrolyte to obtain a mixed powder, and calcining the mixed powder to obtain a solid electrolyte modified by the Schiff base metal nanocomplex. The present invention introduces a Schiff base nanocomplex into the solid electrolyte to make up for the pores of the solid electrolyte, and at the same time improves the interface contact between the electrodes, providing a continuous channel for lithium ion transmission, thereby improving the electrochemical performance of the all-solid-state battery.

The invention provides a sodium manganate-based composite positive electrode material and a preparation method thereof, the positive electrode material comprises sodium manganate, and the sodium manganate is doped with a sodium-containing compound, a metal oxide and a carbon-based material; wherein the sodium manganate, the sodium-containing compound and the metal oxide are all coated with the carbon-based material, the migration rate of sodium ions in the positive electrode material is improved through coating of the carbon-based material, meanwhile, the sodium manganate forms a stable solid solution with the sodium-containing compound and the metal oxide respectively, and dissolution of manganese in the sodium manganate is inhibited. According to the sodium manganate-based composite positive electrode material disclosed by the invention, the sodium-containing compound, the metal oxide and the carbon-based material are compounded with the sodium manganate, so that the first charge-discharge efficiency and the conductivity are improved, and the dissolution of Mn element is inhibited, so that the performance of the sodium manganate composite material is optimal.

The invention provides a modified positive electrode material and a preparation method thereof, a positive electrode and a lithium ion battery. The modified positive electrode material comprises an inner core and a porous carbon coating layer arranged on the surface of the inner core, the inner core has a general formula of LiMnxFe1-x-yCoyPO4, x is greater than or equal to 0.3 and less than or equal to 0.8, and y is greater than or equal to 0.01 and less than or equal to 0.03; the material of the porous carbon coating layer comprises nitrogen-doped porous carbon and reduced graphene oxide. Porous carbon is combined with reduced graphene oxide, so that a three-dimensional conductive framework is linked with a two-dimensional conductive sheet layer to form a three-dimensional conductive network, the conductivity of the modified positive electrode material is remarkably improved, and the volume expansion of the modified positive electrode material in the charge-discharge cycle process is relieved; the doping of Co ions can shorten the M-P bond (M = Mn and / or Fe, and P is phosphorus in phosphate radical), reduce the unit cell volume and broaden the lithium ion transmission path, thereby improving the rate capability and cycle performance of the lithium ion battery.

The invention relates to the technical field of electrochemical energy storage, in particular to an interface optimization type material, a preparation method and application thereof, a preparation method of a positive electrode material, a positive electrode plate and a zinc ion battery. The interface optimization type material comprises polyaniline and manganese oxide; wherein the polyaniline is coated on the surface of the manganese oxide to form a polyaniline layer, and a Mn-N bond is formed between the polyaniline and the manganese oxide. Mn-N bonds formed between polyaniline and manganese oxide can effectively inhibit the dissolution of manganese and prevent the structure collapse of the manganese oxide in the circulation process, so that the circulation stability of the manganese oxide positive electrode is remarkably improved. Bipolar polyaniline has oxidation and reduction units, can serve as a pH buffer and a local proton storage device, and greatly promotes embedding of protons rather than zinc ions, so that generation of ZnMn2O4 and irreversible deposition of dead manganese are inhibited, and a high-energy long-life aqueous zinc-manganese battery based on a reversible MnO2 / Mn < 3 + > and MnO2 / Mn < 2 + > dual energy storage mechanism can be constructed.

The invention provides a lithium super ion conductor coated medium-low nickel precursor material and a preparation method and application thereof, and the preparation method comprises the following steps: mixing an organic metal salt solution and a mixed metal salt solution to obtain a first mixture; adding a lithium super-ion conductor, a precipitant solution and a complexing agent solution into the first mixture, and carrying out a co-precipitation reaction to obtain a second mixture; and continuously heating the second mixture for reaction to obtain the medium-low nickel precursor material coated with the lithium super-ion conductor. According to the preparation method disclosed by the invention, a lithium ion deintercalation rapid channel is effectively widened by adopting a lithium super-ion conductor coating method, the direct contact between the positive electrode material and an electrolyte is avoided, in addition, the problem of peroxidation for refining the primary particle morphology in the reaction process of a medium-low nickel precursor material is avoided by utilizing organic metal salt, and the preparation method has the advantages that the preparation process is simple, the cost is low, and the application prospect is wide. And the cycling stability and the conductivity of the battery are effectively improved.