7results about How to "Facilitate de-intercalation" patented technology

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 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 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.