18results about How to "Suppress shuffling" patented technology

The invention provides a lithium-mixed coated modified ternary positive electrode material as well as a preparation method and application thereof, and relates to the technical field of lithium battery raw materials. Various lithium sources are mixed according to a certain proportion to prepare a ternary positive electrode, co-doping modification is carried out through cooperation of Li3PO4 and a W / Al / Zr / Y / B-containing compound, double-layer coating modification is carried out through cooperation of the Li3PO4 and a Ti / Al-containing compound for primary coating and cooperation of an anhydrous Li compound and TiP2O7 or Ti3 (PO4) 4 for secondary coating, and a double-gradient fast ion conductor coating layer is constructed. The structural stability, the thermal stability, the first discharge capacity and efficiency, the multiplying power, the circulation and storage performance and the like of the single-crystal or polycrystal ternary positive electrode material under different voltage and power conditions are improved; the lithium-mixed multi-element composite ternary positive electrode provided by the invention has the advantages of more stable layered structure, higher safety, higher electronic conductivity, better multiplying power, high specific capacity and long cycle performance.

The invention provides a method for cyclically regenerating a positive electrode active material by using magnesium sulfate, which comprises the following steps: 1) burdening and mixing waste lithium battery black powder, magnesium sulfate and a carbon source, and roasting the mixture in a vacuum or inert atmosphere to obtain a roasted product; (2) adding the roasted product into water to carry out water leaching treatment, and carrying out suction filtration to obtain a lithium sulfate solution and water leaching residues; 3) adding the lithium sulfate solution into the saturated sodium carbonate solution for lithium precipitation to obtain a lithium carbonate precipitate; (4) drying the water leaching residues, adding dilute sulphuric acid to carry out acid leaching treatment, filtering to obtain acid leaching residues and a magnesium sulfate solution, and then carrying out evaporative crystallization treatment on the magnesium sulfate solution to obtain a magnesium sulfate precipitate; 5) mixing the acid leaching residues with lithium carbonate, and sintering to obtain the regenerated ternary positive electrode active material.According to the method, the recovery rate of obtained lithium reaches 99% or above, loss of important elements in the regeneration process can be avoided, cyclic utilization of magnesium sulfate is achieved, and consumption of chemical reagents and secondary pollution are reduced.

The invention discloses a sodium-ion battery positive electrode material with high cycle stability and a preparation method and application thereof, the preparation method comprises the following steps: uniformly mixing a sodium source, a copper source, an iron source, a manganese source, a lithium source and an aluminum source to obtain precursor powder, and preparing the precursor powder into a lithium-ion battery positive electrode material according to the amount of substance; the ratio of sodium in the sodium source to copper in the copper source to iron in the iron source to manganese in the manganese source to lithium in the lithium source to aluminum in the aluminum source is 0.7035: 0.06: 0.33: (0.61-x-y): 1.05 x: y, 0 lt; xlt; 0.1, 0 lt; yt; Yt; 0.1 part; and sintering the precursor powder, and cooling along with a furnace to obtain the sodium-ion battery positive electrode material with high cycle stability. According to the sodium-ion battery positive electrode material with high cycle stability, a P2 phase structure is taken as a basic framework, and lattice distortion and element mixing are effectively inhibited by synergistically doping inactive Li and Al double elements on a copper-iron-manganese-based material, so that the discharge specific capacity, the discharge median voltage and the cycle stability of a sodium-ion battery are improved.

The invention belongs to the technical field of lithium ion batteries, provides a high-entropy high-nickel single crystal lithium ion battery positive electrode material and a preparation method thereof, and aims to solve many problems of a high-nickel nickel cobalt lithium manganate positive electrode material and improve the comprehensive performance of the high-nickel nickel cobalt lithium manganate positive electrode material. Aiming at the modification requirement of the high-nickel layered nickel cobalt lithium manganate ternary system positive electrode material, a high-entropy alloy doping strategy is provided on the basis of a combination design and a component proportion design, and meanwhile, the strict design of a preparation process is combined on the basis of high-entropy alloy doping, so that the positive electrode material after high-entropy doping presents a single-crystal morphology, and the high-entropy doping performance of the positive electrode material is improved. The specific molecular expression is Li < 1 + delta > [Ni < 0.86 + / -x > Co < 0.04 + / -x / 2 > Mn < 0.1 + / -x / 2 > (OH) < 2 >] < 1-z > MzO2, delta is greater than or equal to 0 and less than or equal to 0.2, x is greater than or equal to 0 and less than or equal to 0.06, and z is greater than or equal to 0.005 and less than or equal to 0.25; m is at least five of Al, Mg, Ti, Zr, Ga, In, Y, La, B, Si and Nb. In conclusion, the high-entropy and high-nickel positive electrode material with the single crystal morphology is synthesized by adopting a high-temperature solid-phase method, and the positive electrode material shows good electrochemical performance and can show relatively good specific discharge capacity and cycling stability under the high voltage of 2.8-4.5 V.

The invention relates to a preparation method of a high-nickel positive electrode material with a hollow structure and the high-nickel positive electrode material, and belongs to the technical field of high-nickel positive electrode materials. A two-step coprecipitation method is adopted for preparing a high-nickel positive electrode material precursor, the obtained high-nickel positive electrode material precursor is cleaned and dried, and after the dried high-nickel positive electrode material precursor and LiOH.H2O are mixed and calcined, the high-nickel positive electrode material is prepared. The high-nickel positive electrode material is obtained. A continuous two-step coprecipitation method and a specific calcination process are adopted, and the growth process and the arrangement mode of the precursor are controlled by regulating and controlling reaction conditions and doping elements, so that the formation of a hollow structure and the uniform distribution of the doping elements are ensured. Therefore, the particle morphology can be more accurately controlled, and the formation of microcracks is reduced, so that the cycling stability of the high-nickel positive electrode material is improved.

The invention discloses a preparation method of an Mg / Al co-doped modified layered cobalt-free lithium-rich manganese-based positive electrode material, and belongs to the technical field of lithium ion batteries. The method comprises the following steps: adding excessive Li2CO3, Mn oxide, Ni oxide, Mg compound and Al compound into a ball milling tank of an organic solvent, and fully mixing through mechanical ball milling to obtain uniform mixed powder; drying the mixed powder at 80 DEG C for 3-10 hours; the second-stage roasting temperature is 700-900 DEG C, the second-stage roasting time is 10-20 hours, and the Mg / Al co-doped modified layered cobalt-free lithium-rich manganese-based positive electrode material is obtained. The preparation method comprises the following steps: uniformly mixing the dried powder again, roasting at the room temperature to 350-500 DEG C, preserving heat for 3-6 hours, and roasting at the second-stage roasting temperature of 700-900 DEG C for 10-20 hours. The Mg / Al co-doped layered cobalt-free lithium-rich manganese-based positive electrode material prepared by a high-temperature solid-phase method is subjected to morphology analysis, and it is observed that sample particles are uniform in distribution and appropriate in particle size, which indicates that the Mg / Al co-doped layered cobalt-free lithium-rich manganese-based positive electrode material possibly has good electrochemical performance. Al < 3 + > doping can effectively improve the electrochemical performance of the cobalt-free lithium-rich manganese-based positive electrode material.

The present invention provides a high-throughput power battery positive electrode material and a preparation method thereof, which belongs to the technical field of new energy battery electrode materials. Among them, the preparation method of the high-throughput power battery positive electrode material includes: weighing the raw materials, dividing the nickel source into two parts of unequal weight; respectively configuring the nickel source, cobalt source, and manganese source of large weight portions into solutions, mixing the solutions of the three to form a mixed salt solution to prepare a nickel-cobalt-manganese precursor; sintering the nickel-cobalt-manganese precursor with a lithium source for the first time; configuring the nickel source of small weight portions into a nickel salt solution to prepare a nickel hydroxide precipitate; modifying the nickel hydroxide precipitate to prepare a nickel hydroxide precipitate with a coating layer modified with zirconium dioxide on the surface; sintering the modified nickel hydroxide with the first sintering product for the second time to obtain a high-throughput power battery positive electrode material. The positive electrode material prepared by the above method can reduce the nickel-lithium mixed discharge phenomenon, has high-throughput characteristics, and can be widely used in fast-charging power batteries.

The invention relates to the technical field of lithium ion battery positive electrode materials, in particular to an aluminum-yttrium-boric acid coated high-nickel positive electrode material and a preparation method and application thereof. The preparation method of the material comprises the following steps: synthesizing a doped and modified high-nickel ternary precursor from a mixed metal salt solution and a first aluminum source and / or a first yttrium source through a coprecipitation reaction; mixing the precursor with a lithium source, and performing first sintering treatment to obtain a base material; and mixing the base material with a solution containing boric acid, a second aluminum source and a second yttrium source, and carrying out solvent evaporation and second sintering treatment to obtain a final product. Through the synergistic effect of bulk phase doping and surface composite coating, generation of intragranular cracks and interface side reaction of the material in the circulation process are inhibited at the same time. The obtained positive electrode material successfully overcomes the technical problem that high capacity and long service life are difficult to consider at the same time, and the cycling stability is remarkably improved while the high specific capacity is kept.

The invention provides a multi-site doped positive electrode material and a preparation method thereof. The positive electrode material comprises Br and K as doping elements. In the high-temperature lithiation process of a precursor and a lithium source, Br and K are introduced as doping elements, Br doping can motivate a large amount of oxygen-related anion oxidation reduction behaviors in a layered structure, the capacity of the positive electrode material is improved, irreversible loss of lattice oxygen can be effectively inhibited in the high-voltage cycle process, and the performance of the positive electrode material is improved. And good cycling stability and safety are ensured.

The present invention provides a modified lithium iron manganese phosphate positive electrode material and a preparation method and application thereof. The modified lithium iron manganese phosphate positive electrode material comprises a doped lithium iron manganese phosphate core and a coating layer arranged on the surface of the doped lithium iron manganese phosphate core, the doped lithium iron manganese phosphate core comprises Nb element, the coating layer comprises LiNbO3 and Nb2O5, the modified lithium iron manganese phosphate positive electrode material of the present invention is doped with Nb element, and the surface is double-coated with LiNbO3 and Nb2O5, the coating layer of the modified lithium iron manganese phosphate positive electrode material has good uniformity, consistency and conductivity, and LiNbO3 and Nb2O5 synergistically improve the rate performance and long cycle performance of LMFP electrode materials.

This invention relates to the field of lithium-ion battery cathode material technology, specifically to a ternary composite doped high-nickel cathode material, its preparation method, and its application. The preparation method of the ternary composite doped high-nickel cathode material includes the following steps: preparing a solution A of nickel, cobalt, and manganese salts; preparing a solution B of aluminum, magnesium, and zirconium salts; in the presence of a precipitant, first performing a first co-precipitation reaction in solution A to generate a core precursor, then adding solution B to perform a second co-precipitation reaction to generate a shell precursor on the core surface, thus obtaining a core-shell structure precursor; mixing it with a lithium source and then performing gradient-segmented sintering, followed by post-treatment to obtain the final product. This invention, by concentrating the ternary composite doping elements in the shell layer, significantly improves the structural and thermal stability of the material while ensuring high capacity. The resulting cathode material exhibits excellent capacity retention and rate performance under high-pressure cycling conditions.

The invention discloses a battery positive electrode active material and a preparation method thereof, a positive plate and a lithium ion battery, the lithium ion battery positive electrode active material contains a modified NCM ternary material, and the modified NCM ternary material is obtained by co-modifying the NCM ternary material by a Ta-containing material, an F-containing material and a conductive polymer. When the modified NCM ternary material is adopted in a lithium ion battery positive electrode active material, the stability of the positive electrode material can be improved, and the first charge-discharge efficiency and the cycle performance of the battery are remarkably improved.

The application relates to the technical field of lithium ion batteries, in particular to a high-entropy high-nickel cobalt-free precursor, a high-entropy high-nickel cobalt-free single-crystal positive electrode material and a preparation method thereof and a lithium ion battery. The high-entropy high-nickel cobalt-free precursor comprises a core layer and a high-entropy doped shell layer coated on at least part of the surface of the core layer; the core layer comprises a first nickel-manganese hydroxide; the high-entropy doped shell layer comprises a high-entropy doped second nickel-manganese hydroxide; and the doped elements in the high-entropy doped second nickel-manganese hydroxide include titanium, magnesium, aluminum, zirconium and molybdenum. The high-entropy high-nickel cobalt-free precursor provided by the application is coated with a high-entropy doped shell layer containing titanium, magnesium, aluminum, zirconium and molybdenum on the surface of the core layer containing the first nickel-manganese hydroxide, which is beneficial to reducing the exposure degree of {010} active crystal faces in the precursor, promoting the preferred growth of the positive electrode material along the (003) plane, and further improving the electrochemical performance and cycle stability of the high-entropy high-nickel cobalt-free single-crystal positive electrode material.

The application provides a doped and repaired regenerated lithium nickel cobalt manganese oxide ternary material, a preparation method and application thereof, and belongs to the field of resource recycling science and engineering. The preparation method comprises the following steps: sequentially performing alkali washing and impurity removal and low-temperature pre-burning on waste lithium nickel cobalt manganese oxide material to obtain an activated material; mixing the activated material with a first lithium source, and performing one-time lithium supplement sintering to obtain one-time lithium supplement regenerated material; mixing the one-time lithium supplement regenerated material with a second lithium source and a lanthanide compound, and performing secondary sintering to obtain the doped and repaired regenerated lithium nickel cobalt manganese oxide ternary material. The application adopts a synergistic repair process of "alkali washing and impurity removal-low-temperature pre-burning-step-by-step lithium supplement-lanthanide element doping", does not need to use corrosive reagents and complex separation steps, and has the advantages of simple process, low energy consumption and green environmental protection. The obtained regenerated material restores the layered crystal structure, and when used as a lithium ion battery positive electrode material, has excellent cycle stability and rate performance.

The invention belongs to the technical field of lithium ion batteries, and discloses a single crystal positive electrode material for a lithium ion battery, nickel cobalt lithium manganate is used as a matrix, the surface of the matrix is coated with composite fluoride LiCoNxFy, x is more than or equal to 0.2 and less than or equal to 5, y is more than or equal to 4 and less than or equal to 8, the composite fluoride accounts for 1-5 mol% of the matrix, and a proper amount of protective layer can ensure that the matrix is uniformly and compactly covered, so that the single crystal positive electrode material is prepared. And meanwhile, the integrity of the alpha-NaFeO2 type layered structure of the matrix is kept. The invention also discloses a preparation method, double coating of NFn and LiCoF3 is realized through a three-step sintering process, and the prepared single crystal positive electrode material still keeps a complete alpha-NaFeO2 type layered structure. The invention also discloses a lithium ion battery composed of the single-crystal positive electrode material for the lithium ion battery.

The invention relates to the technical field of lithium ion batteries, and discloses a composite coated ternary positive electrode material as well as a preparation method and application thereof. According to the composite coated ternary positive electrode material provided by the invention, the antimony element is doped in the matrix, so that the crystal structure can be stabilized by Sb < 5 + > with high valence and large ion radius, and the mixed arrangement of cations is reduced; the cobalt and lithium elements of the first coating layer can form a stable spinel structure on the surface of a matrix, and interface side reaction is inhibited; surface coating of the tungsten element, the aluminum element, the titanium element and the zirconium element inhibits interface side reaction, the structural stability of the positive electrode material is improved, and the cycling stability and the thermal stability of the lithium ion battery are further improved.

The present invention discloses a cathode material for a sodium-ion battery with high cycle stability, a preparation method thereof and an application. The preparation method includes: uniformly mixing a sodium source, a copper source, an iron source, a manganese source, a lithium source and an aluminum source to obtain a precursor powder. In terms of the number of moles, the ratio of sodium in the sodium source, copper in the copper source, iron in the iron source, manganese in the manganese source, lithium in the lithium source and aluminum in the aluminum source is 0.7035:0.06:0.33:(0.61 - x - y):1.05x:y, where 0 < x < 0.1 and 0 < y < 0.1; sintering the precursor powder and cooling it with the furnace to obtain a cathode material for a sodium-ion battery with high cycle stability. The cathode material for a sodium-ion battery with high cycle stability according to the present invention takes the P2-phase structure as the basic framework. By co-doping non-active Li and Al elements into the copper-iron-manganese-based material, lattice distortion and element mixing are effectively inhibited, and the discharge specific capacity, discharge median voltage and cycle stability of the sodium-ion battery are improved.

The present invention relates to a preparation method of a high-nickel positive electrode material with a hollow structure and a high-nickel positive electrode material, belonging to the technical field of high-nickel positive electrode materials. A high-nickel positive electrode material precursor is prepared by a two-step coprecipitation method, the obtained high-nickel positive electrode material precursor is cleaned and dried, and the dried high-nickel positive electrode material precursor is mixed with LiOH·H2O and calcined to obtain a high-nickel positive electrode material. The present invention adopts a continuous two-step coprecipitation method and a specific calcination process, and controls the growth process and arrangement mode of the precursor by regulating the reaction conditions and doping elements to ensure the formation of a hollow structure and the uniform distribution of doping elements. It can be seen that the present invention can more accurately control the particle morphology, reduce the formation of microcracks, and thus improve the cycle stability of the high-nickel positive electrode material.