19results about How to "Reduce shuffling" patented technology

The invention relates to the technical field of lithium ion batteries, in particular to a modified cobalt-free lithium-rich manganese-based positive electrode material doped with anions and cations and a preparation method of the modified cobalt-free lithium-rich manganese-based positive electrode material. According to the method, a modified lithium-rich manganese-based precursor is prepared from a metal salt solution, a precipitator, a fluorine source and a complexing agent, and the anion-cation co-doped cobalt-free lithium-rich manganese-based positive electrode material is prepared from the modified lithium-rich manganese-based precursor and a lithium source. The metal salt solution contains manganese salt, nickel salt and aluminum salt. According to the method, by doping Al and F, the voltage attenuation is effectively reduced, the long cycle performance of the material is improved, the rate capability of the material is improved, and in addition, mixed arrangement of lithium and nickel cations is effectively inhibited, so that the cycle stability is improved.

The invention relates to the technical field of batteries, in particular to a surface modification method of a positive electrode. The surface modification method of the positive electrode provided by the invention comprises the following steps that an aluminum source, a carbon nano tube and the positive electrode are mixed and calcined, the surface-modified positive electrode is obtained, the addition amount of the aluminum source is 300 ppm to 900 ppm, and the addition amount of the carbon nano tube is 300 ppm to 900 ppm according to the mass of the positive electrode. The surface of the positive electrode material is modified by coating the positive electrode material with the carbon nanotubes and the aluminum source, on one hand, contact between the positive electrode material and an electrolyte can be isolated to a great extent, and the cycle performance of the material is improved, and on the other hand, the mixture formed by the carbon nanotubes and the aluminum source has good rapid ion and electron transmission performance, and has good electrochemical performance. The migration rate of lithium ions can be improved, the direct-current resistance of the positive electrode material can be reduced, and meanwhile, the increase of the direct-current resistance in the circulation process is inhibited.

The invention belongs to the technical field of battery materials, and particularly relates to a modified high-nickel ternary positive electrode material and a preparation method and application thereof. The preparation method of the modified high-nickel ternary positive electrode material provided by the invention comprises the following steps: 1) mixing a lithium source, a precursor, a tellurium source and a divalent metal compound, and performing first calcination to obtain a first calcined product; (2) dissolving tellurate in an organic solvent, mixing and grinding the formed tellurate organic solvent solution and the first burning product obtained in the step (1), and then carrying out second burning to obtain a second burning product; the tellurate is selected from at least one of potassium tellurite and sodium tellurite; and (3) washing the secondary calcined product obtained in the step (2) with water, mixing with boric acid, and carrying out third calcination to obtain the modified high-nickel ternary positive electrode material. Through the specific preparation method and the synergistic effect among the steps, the obtained modified high-nickel ternary positive electrode material has good specific capacity, first effect and cycle performance.

The invention relates to a cobalt-free ultra-high nickel positive electrode material and a preparation method and application thereof, the preparation method comprises the following steps: ball-milling and mixing a nickel source, a lithium source and a dopant to obtain powder, and drying and sintering the obtained powder to obtain the cobalt-free ultra-high nickel positive electrode material, the doping agent comprises an aluminum-containing doping agent and a manganese-containing doping agent; the nickel source, the lithium source and the doping agent are mixed according to the molar ratio of the nickel element to the lithium element to the total doping element being (0.90-0.98): (1.03-1.06): (0.02-0.10). The Al and Mn elements are uniformly doped in the positive electrode material substrate through a solid-phase reaction method, the material performance is synergistically improved by utilizing the unique action mechanism of the doped elements, the electrochemical performance is synergistically improved on the premise of not depending on the cobalt element, and high initial discharge capacity, cycling stability and rate capability are kept in a wide voltage interval; and excellent capacity retention capability is shown in a wide multiplying power range.

This invention discloses a zirconium-lanthanum bulk co-doped high-nickel ternary material, its preparation method, and a battery. The zirconium-lanthanum bulk co-doped high-nickel ternary material is a ternary cathode material with bulk co-doped zirconium and lanthanum; the chemical formula of the ternary cathode material is LiNi. x Co y Mn (1‑x‑y) O2, wherein 0.8≤x≤0.9, 0≤y≤0.1; the total molar amount of zirconium and lanthanum is 1%~5% of the total molar amount of nickel, cobalt and manganese. The zirconium-lanthanum bulk co-doped high-nickel ternary material provided by the present invention enhances the mechanical strength of the ternary material through the bulk co-doping of zirconium and lanthanum, suppresses cracking and pulverization of the ternary material during charge and discharge, and improves cycle stability; at the same time, the two elements Zr and La synergistically stabilize the lattice, reduce lithium-nickel mixing, suppress irreversible phase transformation and lattice oxygen precipitation, achieve dual stability of bulk phase and interface, and improve the consistency and stability of the zirconium-lanthanum bulk co-doped high-nickel ternary material.

The invention relates to the technical field of lithium ion batteries, in particular to a composite positive electrode material and a preparation method thereof, a lithium ion battery and electric equipment. The invention provides a preparation method of a composite positive electrode material, which comprises the following steps: mixing a bulk phase dopant, a lithium source and a ternary precursor to obtain a mixture I, and respectively sintering at 815-830 DEG C for 12-14 hours and at 760-770 DEG C for 8-10 hours to obtain a sintered material I-1 and a sintered material I-2; a first coating agent and a second coating agent are mixed with the sintered material I-1 and the sintered material I-2 respectively and then coated, and a sintered material II-1 and a sintered material II-2 are obtained; and mixing the sintered material II-1 and the sintered material II-2 to obtain the composite positive electrode material. According to the invention, the bulk phase dopant and the doped ternary precursor core layer are firstly added, then the first coating agent and the second coating agent are added, and the surface functional layer is synthesized, so that the composite positive electrode material has both high capacity and high cycle stability under the synergistic effect of the bulk phase dopant and the doped ternary precursor core layer.

The present invention discloses a single crystal cobalt-free positive electrode material, a preparation method thereof and a lithium ion battery, wherein the method comprises the following steps: acid-treating a polycrystalline cobalt-free positive electrode material with an acid solution; mixing the acid-treated cobalt-free positive electrode material with a lithium salt, and sintering the mixture to obtain a single crystal cobalt-free positive electrode material. The method of the present invention utilizes acid etching of a polycrystalline cobalt-free positive electrode material, and performs lithium addition and sintering to obtain a single crystal cobalt-free positive electrode material, and can obtain a positive electrode material with primary particle dispersion, thereby improving rate performance and cycle performance. It can be used as a recycling strategy for polycrystalline positive electrode materials.

This invention discloses a low-temperature high-performance cathode material, its preparation method, and its application, relating to the field of lithium-ion battery cathode material technology. The cathode material is a layered LiNi alloy. 0.6 Co 0.2 Mn 0.2 Using O2 as a matrix, a composite interface layer is constructed in situ on the particle surface. This composite interface layer comprises an outer continuous coating layer and an inner near-surface control layer. Surface reactions and heat treatment using a Li2O, B2O3, and Li3PO4 precursor system are employed to suppress interfacial side reactions, stabilize the near-surface structure, and achieve low-temperature Li... + Improved transport capacity. At -20°C, the preferred sample achieved a discharge specific capacity of 154.21 mAh g⁻¹ in the 10th cycle. ‑1 The rate performance, cycle stability and polarization index are all superior to the original sample and the key control group.

The invention relates to the technical field of lithium ion batteries, and discloses a high-nickel ternary positive electrode material and a preparation method and application thereof, and the preparation method comprises the following steps: mixing and sintering a nickel-cobalt-manganese precursor, a lithium source, niobium salt and fused salt. According to the preparation method of the high-nickel ternary positive electrode material provided by the invention, the niobium salt and the molten salt form a liquid phase environment at a relatively low temperature, and the niobium element can efficiently enter a crystal lattice, so that uniform bulk phase doping in a real sense is realized, and the electrochemical stability and the thermal stability are improved; meanwhile, the niobium doping can ensure the rapid and uniform transmission of the lithium source, so that the lithiation is more sufficient, and the lithium-nickel mixed arrangement caused by lithium deficiency is reduced in dynamics.

The present invention proposes a lithium-ion battery positive electrode material and a preparation method and application thereof, belonging to the technical field of positive electrode materials. A Ni-Co-Mn precursor is prepared by coprecipitation, and the surface is coated with SiO 2 layer, after tannic acid modification, with UiO‑66‑NH 2 The positive electrode material of lithium ion battery prepared by the present invention improves the stability of the material, reduces the mixed arrangement of cations, improves the capacity retention rate after multiple cycles, improves the cycle stability and rate performance of the material, improves the initial discharge capacity and coulomb efficiency, and has broad application prospects.

The invention relates to a method for reconstructing a waste ternary polycrystalline material into a ternary single crystal material, which comprises the following steps: S1, crushing the waste ternary polycrystalline material to obtain single crystal particles; s2, mixing the single crystal particles with nickel oxide, lithium hydroxide and an additive, and presintering to obtain a to-be-repaired material; and S3, sintering and crushing the to-be-repaired material to obtain the ternary single crystal material. According to the invention, after the waste ternary polycrystalline material is crushed, the ternary polycrystalline material is recrystallized into a layered oxide positive electrode material through two-step sintering, and nickel oxide is used as a catalyst to play a role in assisting crystal growth; the lithium hydroxide is used as a lithium supplement agent to supplement lithium consumed by single crystal growth, the additive can reduce lithium and nickel mixing caused by high lithium content in the growth process, the preparation process is simple, the cost is low, and the growth uniformity of single crystals can be improved through a method for directly obtaining single crystal particles after crushing.

The invention discloses a niobium-doped single crystal nickel-enriched ternary positive electrode material and a preparation method thereof. The niobium-doped single crystal nickel-enriched ternary positive electrode material comprises a nickel-enriched ternary positive electrode material, the chemical general formula of the nickel-enriched ternary positive electrode material is LiNi < x > Co < y > Mn < z > O < 2 >, wherein x ranges from 0.79 to 0.81, y ranges from 0.09 to 0.11, and z ranges from 0.09 to 0.11; the nickel-enriched ternary positive electrode material is of a single-crystal structure, and Nb < 5 + > ions are doped in crystal lattices of the nickel-enriched ternary positive electrode material. According to the single-crystal nickel-enriched ternary positive electrode material provided by the invention, the crystal boundary is eliminated in the single-crystal morphology, and particle cracking and electrolyte erosion in the circulation process are effectively inhibited; nb5 < + > is doped into crystal lattices, and due to the fact that the ionic radius of the Nb5 < + > is large, the Nb5 < + > serves as a supporting column, the lithium interlayer spacing is enlarged, the lithium ion migration energy barrier is reduced, meanwhile, the crystal structure is stabilized, and Li < + > / Ni < 2 + > cation mixed arrangement is reduced.

The present invention relates to the technical field of lithium battery material preparation, specifically a layered lithium-rich positive electrode material, a preparation method and a lithium-ion battery regulated by Fe / Mg doping. The present invention prepares a multi-element doped lithium-rich layered positive electrode material by co-doping Fe and Mg on the basis of a cobalt-free lithium-rich layered positive electrode material having an R-3m space group structure to partially replace Mn and Li in a transition metal layer. In the positive electrode material prepared by the present invention, the doping of the Fe element can reduce the covalency between the transition metal and oxygen, thereby suppressing the irreversible oxygen loss of the first cycle, and the Mg element replacing lithium can reduce the Li / Ni mixing, and can support the layered structure. The introduction of the two elements Fe and Mg stabilizes the structure of the material, improves the cycle performance and rate performance of the material, and significantly alleviates the voltage drop of LNMO, thereby improving the overall electrochemical performance of the material.

The invention provides a modified lithium-rich manganese-based positive electrode material, a preparation method thereof and a solid-state battery. The method comprises the following steps: mixing a manganese source, a nickel source and a cobalt source, adding deionized water and a dispersing agent into the mixture, adjusting the pH value to 8.5-11.5, carrying out coprecipitation reaction at 40-80 DEG C for 12-36 hours, filtering, washing and drying to obtain a manganese-based precursor; carrying out ball-milling mixing on the manganese-based precursor, a lithium source, a main doping agent and an auxiliary doping agent to obtain mixed powder; heating the mixed powder to 800-1050 DEG C under the protection of inert gas, and keeping the temperature for 8-16 hours; according to the modified lithium-rich manganese-based positive electrode material, the structural stability is improved, the electrochemical performance of the material is optimized, the specific capacity and the cycling stability are improved, the rate capability is improved, and meanwhile, the interfacial compatibility with a solid electrolyte is improved. The solid-state battery based on the material has excellent comprehensive performance, the preparation process is simplified, the cost is reduced, and the material is suitable for large-scale industrial production.

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.

This invention provides a cathode material, its preparation method, and its application. The preparation method includes the following steps: mixing the high-nickel cathode material to be treated with potassium hexafluoronickelate, and performing heat treatment under an oxygen atmosphere to obtain the cathode material. This invention solves the problem of trivalent nickel decomposition to divalent nickel on the cathode material surface during oxidation sintering by using potassium hexafluoronickelate to oxidize the high-nickel cathode material, thus introducing nickel and fluorine into its surface layer. This reduces lithium-nickel mixing and avoids introducing electrochemically inert metal materials or difficult-to-remove impurities, thereby improving the capacity and cycle stability of the cathode material.

The present invention provides a composite material and a preparation method and use thereof. The preparation method comprises the following steps: (1) growing a two-dimensional material on a substrate by chemical vapor deposition to obtain a two-dimensional material film; (2) coating a polymer on the surface of the two-dimensional material film away from the substrate to obtain a composite film comprising a two-dimensional material film and a polymer layer; shearing and rolling the composite film transversely to obtain a composite wire; (3) 3D printing the composite wire to obtain the composite material; the composite material obtained by the preparation method provided by the present invention has a specific configuration and function; the preparation method can make the two-dimensional film material uniformly dispersed in the three-dimensional composite material, and can improve the mechanical or electrical properties of the composite material.

The invention provides a lithium-rich manganese-based positive electrode material as well as a preparation method and application thereof, and relates to the technical field of lithium ion batteries. In the lithium-rich manganese-based positive electrode material, Mg and P elements are uniformly distributed from a bulk phase to the surface, W element is uniformly distributed in the bulk phase, the surface is in gradient distribution with gradually increased concentration, the content of W in the bulk phase is a, and the average content of the surface is b, 0% lt; a is less than or equal to 0.6 mol%, alt; and b < = 2mol%. According to the invention, through synergistic doping of multiple elements on the body surface, the cycling stability and the voltage drop of the positive electrode material, especially the high-temperature cycling performance, can be remarkably improved, and meanwhile, the specific discharge capacity and the first efficiency of the lithium ion battery are also remarkably improved.

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.