1299 results about "Lithium" patented technology

Processes for extracting lithium from a clay mineral and compositions thereof are described. The extraction process includes providing a clay mineral comprising lithium, mixing a cation source with the clay mineral, performing a high-energy mill of the clay mineral, and performing a liquid leach to obtain a lithium rich leach solution.

The invention belongs to the technical field of energy storage materials, and particularly relates to a high-entropy oxide Fe0. 2Co0. 2Ni0. 2Cu0. 2Zn0. 2O and an ultrafast synthesis method and application thereof. According to the preparation method, ferroferric oxide, cobalt oxide, nickel oxide, copper oxide and zinc oxide with equal molar ratio are adopted as direct synthesis raw materials, toxic gases such as chlorine and nitrogen dioxide generated in the synthesis process of a metal salt precursor are avoided, and the uniformly distributed single-phase high-entropy oxide is synthesized in an ultrafast manner within 10 seconds by using a Joule heating technology; the synthesized high-entropy oxide is used as a lithium ion battery negative electrode material, and shows more excellent electrochemical performance and cycling stability compared with other high-entropy oxides prepared from transition metals with different proportions; in the preparation process, extra additives are not needed, operation is easy, the synthesis speed is high, the yield is high, element distribution is uniform, and the method has the advantages of being low in cost, high in efficiency and free of pollution and has the industrialization prospect.

The invention provides a positive active material with a lithium fluoride layer as well as a preparation method and application of the positive active material. The positive active material comprises a high-nickel ternary positive material and the lithium fluoride layer covering the surface of the high-nickel ternary positive material, and the thickness of the lithium fluoride layer is 10-100 nm. In the positive electrode active material with the lithium fluoride layer, the surface of the high-nickel ternary positive electrode material is covered with the lithium fluoride layer, and lithium fluoride has excellent chemical stability, conductivity and lithium ion transmission rate, so that the positive electrode active material is coated with the lithium fluoride layer with the thickness of 10-100nm, thereby ensuring that the positive electrode active material has relatively good ion transmission performance; the internal strain and phase change of the high-nickel ternary positive electrode material are inhibited, and the risk that the high-nickel ternary positive electrode material generates cracks is reduced; the interface performance is improved, and the active material is isolated from the electrolyte, so that the risk of side reaction between the high-nickel ternary positive electrode material and the electrolyte is reduced, and the high-nickel ternary positive electrode material is prevented from being dissolved and delithiated.

The invention discloses a double-site doped titanium lithium ion sieve adsorbent as well as a preparation method and application thereof. The adsorbent is a lithium removal product of a double-site doped titanium lithium ion sieve adsorbent precursor, the chemical general formula of the double-site doped titanium lithium ion sieve adsorbent precursor is Li (2-x) MxTi (1-y) NyOz, M is at least one of Na < + >, K < + >, Zn < 2 + >, Co < 2 + >, Ni < 2 + >, Mg < 2 + > and Al < 3 + > and occupies Li site, N is at least one of Cr < 3 + >, Fe < 3 + >, Zr < 4 + >, Nb < 5 + >, Ta < 5 + >, V < 5 + >, Mo < 6 + > and W < 6 + > and occupies Ti site, x is larger than or equal to 0.001 and smaller than or equal to 0.5, and y is larger than or equal to 0.001 and smaller than or equal to 0.5. Metal cations are introduced to replace Li sites and Ti sites at the same time, Li site substitution enlarges interlayer spacing and improves Li < + > diffusion rate, Ti site substitution regulates local chemical bond and electron distribution, stabilizes lattice structure and enhances electron conduction, and through double-site doping, 'ion-electron 'double channels are constructed, so that a collaborative optimization effect is achieved. The double-site doped titanium lithium ion sieve adsorbent disclosed by the invention is applied to adsorption and extraction of lithium in a Bayer process sodium aluminate solution, and the adsorbent shows excellent adsorption performance.

The invention discloses a composite separation membrane for enriching < 6 > Li isotope and application. The composite separation membrane comprises a functional membrane and at least one supporting membrane; the functional film comprises a plurality of pore channels penetrating through the first surface and the second surface of the functional film, and the pore channel diameter of each pore channel is 0.4-0.7 nm; a lithium ion trapping functional group or a macrocyclic compound and a derivative thereof are modified at an inlet of the first surface of the pore channel. The strength of the lithium isotope separation effect depends on the diameter of a pore channel of the composite separation membrane and functional groups modified at an inlet, does not change along with the migration time and the lithium ion migration proportion, and has long-term continuous stability.

The invention discloses a technological method for extracting lithium, rubidium and cesium through a lepidolite chlorate method. The technological method comprises the steps that lepidolite, calcium chloride, sodium chloride and calcium oxide are mixed and then roasted, and clinker is obtained; leaching the clinker under an acidic condition to obtain brine; performing impurity removal treatment on the brine to obtain purified clear liquid; performing lithium precipitation on the purified clear liquid through sodium carbonate liquid; the method comprises the following steps: extracting filtered waste liquid subjected to lithium precipitation through an extracting agent and a dispersing agent, washing a rubidium and cesium oil phase obtained by extraction by adopting two-section multi-stage cross flow of different detergents to obtain an organic phase, and carrying out reverse extraction on the obtained organic phase to reversely extract rubidium and cesium into reverse water; and preparing salt from the reverse water in an evaporation drying manner. According to the method, after the lepidolite is subjected to roasting transformation leaching, the leaching rate of lithium can reach 94% or above, the leaching rates of rubidium and cesium can reach 98% or above, the process of extracting lithium, rubidium and cesium from the lepidolite to prepare corresponding salt products is environmentally friendly, energy-saving, low in energy consumption, low in cost and high in extraction rate, and wide industrial application prospects are achieved.

The invention belongs to the technical field of nanocrystal nucleus early strength agents, and provides a damp and hot nanocrystal nucleus early strength agent, a tailing solidification filling material and a preparation method and application of the damp and hot nanocrystal nucleus early strength agent and the tailing solidification filling material. The invention discloses a molybdenum ore tailing slurry which is prepared from the following raw materials in parts by weight: 1 part of Portland cement, 4 to 6 parts of molybdenum ore tailings, 0.06 to 0.1 part of zeolite powder, 0.07 to 0.1 part of nanoscale attapulgite powder, 0.06 to 0.1 part of gamma-glycidyl ether oxypropyl trimethoxy silane, 0.03 to 0.1 part of potassium silicate, 0.04 to 0.1 part of sodium hydroxide, 0.06 to 0.1 part of calcium formate, 0.04 to 0.1 part of lithium metaaluminate and 1.25 to 1.75 parts of water. According to the technical scheme, the problem that a filling body prepared from an early strength agent in the prior art is low in early and later strength is solved, and meanwhile, the early strength agent is simple and convenient in preparation mode, low in cost and wide in application range.

The invention discloses a silicon-carbon composite material and a preparation method thereof. The composite material is composed of porous hard carbon, inorganic lithium salt doped with the porous hard carbon and a porous metal frame as a matrix, nano silicon deposited in pores of the matrix, and an amorphous carbon composite material coated on the surface. The preparation method comprises the following steps: uniformly mixing resin, inorganic lithium salt and a porous metal framework, and carrying out hydrothermal reaction, activation and secondary carbonization to obtain a porous carbon complex; and depositing nano silicon and coating the nano silicon with an organic lithium salt through a vapor deposition method to obtain the silicon-carbon composite material. According to the obtained material, expansion is reduced through large-aperture deposited nanometer silicon of the metal frame structure, the defects are reduced through the inorganic lithium salt of the inner core and the organic lithium salt of the outer shell, the ion diffusion rate is increased, and the first efficiency and the rate performance are improved.

The present invention provides a single-crystal lithium-rich manganese-based positive electrode precursor and its preparation method and application. The single-crystal lithium-rich manganese-based positive electrode precursor comprises secondary particles formed by primary particles and satisfies the following relationship: 1.2μm≤D50≤1.8μm, 0.5μm≤D R <6.0μm, 0.5g / cm 3 ≤α≤0.8g / cm 3 , 30m 2 / g≤β≤50m 2 / g, 22≤α·β≤28, 20nm≤N≤45nm, 5≤M / N≤10, wherein D50 is the median particle size of the secondary particles, D R is the particle size of the secondary particles, α is the tap density of the secondary particles, β is the specific surface area of ​​the secondary particles, N is the average thickness of the primary particles, and M is the average length of the primary particles. The median particle size of the secondary particles of the single-crystal-like lithium-rich manganese-based positive electrode precursor provided by the present invention is no more than 1.8 μm, which is significantly lower than the reported particle size of (quasi) single-crystal lithium-rich positive electrode precursors. The precursor can be made into a submicron-level single-crystal-like lithium-rich manganese-based positive electrode material with excellent dispersibility.

The invention provides a metal material recycling device and a method for leaching fluorine beryllium thallium and lithium rubidium cesium in lithium slag. Relates to the field of metal material recycling, and comprises a leaching tank placed on the ground through four supporting frames, the top of the leaching tank is fixedly provided with a top cover, and the bottom of the leaching tank is fixedly provided with a bottom cover. According to the metal material recycling device and the leaching method for fluorine beryllium thallium and lithium rubidium cesium in the lithium slag, the ultrasonic generator is arranged to supply energy to the first ultrasonic transducer and the second ultrasonic transducer to generate ultrasonic waves, the ultrasonic waves generate microjet flow to impact the surface of minerals, acid liquor permeation and ion diffusion are accelerated, the leaching time is shortened, and the efficiency is improved; the surface of the lithium slag is not prone to passivation, the leaching rate of target metal ions is increased, the leaching liquid is pumped out through the water suction pump, manual contact with the leaching liquid in the next solid-liquid separation procedure is facilitated, dilute sulfuric acid is supplemented through the acid supplementing pipe, then the lithium slag is placed through the funnel, and the consistency and controllability of starting of the leaching reaction are guaranteed.

The invention provides a method for solidifying heavy metal ions in lithium slag, and belongs to the technical field of solidified lithium slag treatment. The method for solidifying the heavy metal ions in the lithium slag comprises the steps that lithium slag powder is taken as a base material, sodium fluoride, silicon carbide, sodium tetraborate and hydroxyapatite are added into the base material for dry mixing, and mixed powder is obtained; adding deionized water into the mixed powder to prepare a spherical green body; drying the spherical green body to obtain a dried green body; and sintering the dried green body, and cooling to room temperature to obtain the cured lithium slag ceramsite. According to the method, pollution-free treatment of the lithium slag is achieved, meanwhile, the treatment process is simplified, environmental damage is reduced, and resource utilization of the lithium slag is improved.

A treatment process for crystallizing a metal sulfate involving pre-treating a feedstock comprising calcium, magnesium, and / or lithium impurities, the pre-treating involving pre-leaching the feedstock in the presence of a lixiviant, selectively extracting a first portion of any of the impurities from the feedstock, and forming a leached solution comprising an uncrystallized metal sulfate and any remaining impurities; and / or refining the leached solution and removing a second portion of any of the remaining impurities; and crystallizing the uncrystallized metal sulfate from the leached solution to form a crystallized metal sulfate. So processed, the crystallized metal sulfate may be battery-grade or electroplating-grade.

The invention discloses a method for extracting lithium and sodium from overhaul slag through electrochemistry assistance, and belongs to the technical field of aluminum electrolysis lithium-containing solid waste cyclic economic utilization and environmental protection. A method for extracting lithium and sodium from overhaul slag through electrochemical assistance comprises the following steps that the overhaul slag and auxiliary materials are subjected to die-casting forming to prepare an electrode plate, and then lithium and sodium are extracted from the overhaul slag through an electrochemical method. According to the method, for the lithium-containing overhaul slag solid waste generated in the electrolytic aluminum industry, migration and dissolution of metal ions are enhanced through electrochemical assistance in a weak acid environment, so that comprehensive recycling of valuable elements of lithium and sodium is achieved, and meanwhile the recovery rate of lithium can be larger than 90%. In addition, the method can be carried out at low temperature, so that the energy consumption can be obviously reduced, and meanwhile, the equipment investment can be greatly reduced; meanwhile, solid waste resource utilization can be achieved, the risk of secondary pollution is reduced, and good economic and environmental benefits are achieved.

The invention relates to a layered oxide material with high cycle stability and a preparation method and application thereof, the chemical formula of the layered oxide material is LiaNabNixMn (1-x) O2, 0 lt; xlt; 0.90 < = a < = 1, 0 < = b < = 0.1; the preparation method comprises the following steps: preparing a layered oxide precursor NaNi < x > Mn < 1-x > O < 2 >; mixing the precursor with a first lithium source, and then carrying out lattice site Li < + > / Na < + > replacement by at least one of molten salt ion exchange, solid phase ion exchange and liquid phase ion exchange to obtain an intermediate; cleaning the intermediate, performing solid-liquid separation, and drying to obtain a layered oxide material with high cycle stability; the layered oxide material is prepared through lattice site selective Li < + > / Na < + > replacement reaction, so that the obtained material has excellent cycling stability and specific capacity, and the method is simple in process, low in cost and suitable for large-scale production.

The invention provides a lithium ore roasting waste heat recovery device and a process for extracting beryllium from lithium-containing ore. The waste heat recovery device comprises a box body, an adjusting mechanism and a heat exchange pipe. A first dispersion cover and a second dispersion cover are mounted on the left side and the right side of the box body through bolts, and the adjusting mechanism is located outside the second dispersion cover; the adjusting mechanism comprises a discharge pipe, a mounting cover and an adjusting motor, the discharge pipe is fixedly arranged at the outlet end of the second dispersion cover, and the mounting cover is hermetically mounted at the outer end of the discharge pipe through a bolt. The flow channel of the heat exchange element is designed to be of a reducing structure with a thick inlet and a thin outlet, at the moment, a high-temperature section at the inlet position can fully exchange heat, but the heat of smoke entering a low-temperature section is not higher than that of the high-temperature section, the inner diameter of the outlet section can be reduced, the smoke flow is small at the moment, and therefore most smoke can be gathered in the low-temperature section, and full heat exchange of the low-temperature section can be achieved.

The present invention provides a method for stepwise recovering lithium and rare earths from rare earth molten salt electrolysis slag, belonging to the technical field of metallurgical waste slag treatment and secondary resource recycling. The method comprises the following steps: (1) reacting the rare earth molten salt electrolysis slag with sulfuric acid for leaching to obtain a lithium-containing solution and a leaching residue; (2) mixing the leaching residue with an additive for low-temperature roasting transformation to obtain a roasting product; (3) performing water leaching on the roasting product to obtain a water leaching residue; (4) performing acid leaching on the water leaching residue and adding a reducing agent to obtain a rare earth leaching solution and a leaching residue; wherein, the additive is an alkali and activated carbon, and the reducing agent is formaldehyde or hydrogen peroxide. The method of the present invention realizes the mineral phase transformation and efficient extraction of lithium and rare earths in the rare earth molten salt electrolysis slag, realizes the separation of lithium and rare earths, and at the same time, fluorine can be recovered, having the advantages of high extraction rates of lithium and rare earths and being green.

The invention relates to the technical field of solid waste treatment, and discloses a lithium slag treatment method which comprises the following steps: (1) mixing lithium slag and an alkaline reactant, and grinding to obtain a mixed raw material; (2) sintering the mixed raw material to obtain sintered clinker; and (3) dipping the sintered clinker in an alkaline solution, and carrying out solid-liquid separation. According to the method, toxic elements in the lithium slag can be effectively removed, environmental risks caused by long-term stockpiling of the lithium slag are avoided, potassium and sodium elements in the lithium slag can be effectively removed, adverse effects of the lithium slag on soil and building materials in building and soil application are avoided, and the utilization rate of the lithium slag is increased.

The invention discloses a lithium-rich manganese-based positive electrode material with a fast ion conductor coating layer and bulk phase doping and a preparation method of the lithium-rich manganese-based positive electrode material, the surface of the lithium-rich manganese-based positive electrode material is coated with the coating layer composed of amorphous Li3PO4, the interior of the bulk phase is doped with other elements, the structural formula of the lithium-rich manganese-based positive electrode material is Li < 1 + a > Mn M < c > O < 2 >, m is one or more than one of Ni, Co, A1, Cr, Fe, Mg and Ce, 0 lt; a is less than or equal to 0.2, 0lt; b < = 1, 0lt; c < = 1, and a + b + c = 1. The method comprises the following steps: (1) fully mixing a lithium-rich manganese-based positive electrode material precursor, a certain proportion of lithium salt and a proper amount of phosphate; and (2) sintering the uniformly mixed sample in a certain atmosphere to obtain the lithium-rich manganese-based positive electrode material with the fast ion conductor coating layer and the bulk phase doping structure. The first coulombic efficiency of the lithium-rich positive electrode material is improved, the cycling stability and the rate capability of the lithium-rich positive electrode material are improved, and the requirements of a power battery can be met.

The invention discloses a method for detecting trace chromium element in copper foil based on ICP-OES (Inductively Coupled Plasma-Optical Emission Spectrometer), which comprises the following steps: soaking a lithium battery copper foil in a mixed solution of concentrated nitric acid and hydrofluoric acid for high-temperature digestion, adding a scandium internal standard solution, and fixing the volume to obtain a solution to be detected; preparing a mixed standard solution of chromium element and scandium element with a plurality of concentration gradients, and establishing a standard curve through ICP-OES; and determining the content of the chromium element in the to-be-detected solution according to the standard curve. The lithium battery copper foil is digested through a mixed acid system, concentrated nitric acid provides an acid environment and an oxidation effect, hydrofluoric acid promotes dissolution, it is ensured that the copper foil is completely dissolved, and the digestion efficiency is improved; a scandium internal standard method is introduced, a dynamic background correction mode of ICP-OES is adopted, a scandium internal standard element can correct signal fluctuation in a sample introduction process, dual guarantee is formed by the scandium internal standard element and dynamic background correction, interference of a copper matrix on a Cr spectral line is specifically eliminated, and the trace chromium element detection precision is remarkably improved.

The invention provides lithium brine thallium removal equipment and a magnetic MOFs thallium removal agent preparation process thereof. The water pollution treatment device comprises a bottom plate, a tank body, a top cover, a mounting plate, a positioning frame, a driving mechanism and a discharging mechanism, the tank body is mounted on the upper surface of the bottom plate, the top cover is mounted on the upper surface of the tank body through bolts, the mounting plate is mounted on the upper surface of the top cover, and the positioning frame is mounted on the upper surface of the mounting plate. In the rotating process of the rotating drum, the rotating drum is automatically driven by the guide wheel to automatically ascend along with the thickness of the auxiliary plate, and when the guide wheel rotates to the vertical plane of the auxiliary plate, the guide wheel automatically falls to control the rotating drum to reset, so that the rotating drum can vertically move in the rotating process; in addition, small-amplitude vibration can be formed, so that the Fe3O4-coated UiO-66-NH2 nanoparticles are firstly treated into a liquid state and then are injected into the lithium leaching solution, and the concentration in the leaching solution can be ensured to be more uniform.

The invention discloses an efficient lithium slag solidification and stabilization agent and a preparation method thereof. The efficient lithium slag solidification and stabilization agent comprises the following raw materials in parts by weight: 20-50 parts of lithium slag, 5-10 parts of carbide slag, 8-12 parts of nano silicate, 6-12 parts of slag powder, 3-6 parts of hydroxyapatite, 2-5 parts of bentonite, 4-8 parts of fly ash and 1-3 parts of aluminum sulfate. The method disclosed by the invention has the advantage of environmental protection, and solves the problems that when the existing lithium slag is recycled, the lithium slag is inconvenient to solidify and stabilize, the lithium slag often contains heavy metals, and if the lithium slag is not fixed in a lattice structure through solidification and stabilization technologies, the heavy metals can be leached along with rainwater to enter soil and water, and long-term ecological pollution is caused.

Disclosed herein is an apparatus for separating lithium ions from solution. The apparatus includes a first lithium selective reactor. The first lithium selective reactor includes a lithium selective electrode configured to absorb lithium ions from the solution, a separator, and a counter electrode. The apparatus further includes a lithium rejective reactor. The lithium rejective reactor includes a lithium rejective electrode, a separator, and a counter electrode.

The invention relates to an extraction system and an extraction method for directly extracting lithium from brine, the system comprises a plurality of counter-current extraction tanks which are connected in series through an oil phase pipeline, and an extraction agent sequentially flows through the first-stage counter-current extraction tank and the last-stage counter-current extraction tank through the oil phase pipeline; the counter-current extraction tanks are divided into m equal-stage extraction groups larger than or equal to 2 in the extraction agent flowing direction, n equal-stage extraction tanks are arranged in each equal-stage extraction group, and the n counter-current extraction tanks in one equal-stage extraction group are communicated with the n counter-current extraction tanks in the adjacent equal-stage extraction group one by one through water phase pipelines. The to-be-extracted brine flows into the n counter-current extraction tanks in the m same-stage extraction group through water phase pipelines respectively, and the brine subjected to counter-current extraction flows out through the n counter-current extraction tanks in the first same-stage extraction group respectively, so that the concentration difference in the counter-current extraction process is increased, and the device is suitable for extracting lithium in the brine with relatively low lithium ion concentration; and the balance between high yield and low production cost of lithium ions is realized.

The invention provides a surface modification method for a lithium-rich manganese-based positive electrode material, which comprises the following steps of: washing by using a peroxide-containing aqueous solution, properly increasing the washing temperature (preferably 40-80 DEG C), regulating the reaction pH value to 1-7, accurately controlling the ratio of acidity to free radical oxidation reaction, and optimizing the interface stability, oxygen vacancy density and Li < + > diffusion rate, thereby obtaining the lithium-rich manganese-based positive electrode material. Meanwhile, the dosage of peroxide (preferably persulfate) is reduced, the reaction time is shortened, the modification efficiency is improved, the raw material consumption is reduced, and the production cost is reduced.

The present technology relates to an insulating composition having excellent wet adhesion and a method for preparing the same, and since an insulating coating layer has excellent wet adhesion in a liquid electrolyte, the advantage is that migration of lithium ions in overlapping regions of electrodes can be prevented to suppress capacity expression and the like.

The invention belongs to the technical field of lithium ion adsorption materials, and relates to a preparation method of a multi-element co-doped lithium-aluminum layered double hydroxide and a lithium extraction adsorbent. The invention discloses a preparation method of a multi-element co-doped lithium-aluminum layered double hydroxide. The preparation method comprises the following steps: (1) dissolving an aluminum salt, a lithium salt and a low-valence metal element salt in water to obtain a precursor solution; (2) slowly adding a bio-based precipitant to adjust the pH value, and heating and stirring for reaction to obtain a precursor colloidal solution; (3) adding a modifier containing a non-metallic element X to adjust the pH value, carrying out ultrasonic dispersion, and transferring to a microwave reaction kettle to carry out a microwave reaction; the lithium-aluminum layered double hydroxide co-doped with the low-valence metal element M and the non-metal surface modification element X is obtained. According to the method, the diffusion rate and the adsorption performance of lithium ions are remarkably improved; according to the lithium extraction adsorbent disclosed by the invention, the adsorption efficiency and selectivity of lithium ions in salt lake brine with a high magnesium-lithium ratio are remarkably improved.

The invention provides a method for preferentially extracting lithium from a waste lithium-containing material, and relates to the field of battery recovery. Mixing the waste lithium-containing material with a lead-containing compound, and roasting to obtain roasted sand; carrying out water leaching on the roasted product, and carrying out solid-liquid separation to obtain lithium-rich water leaching liquid and water leaching residues; the water leaching residues are subjected to acid leaching and liquid-solid separation, and acid leaching residues and acid leaching liquid are obtained; the waste lithium-containing material comprises black powder and / or positive electrode powder; the lead-containing compound comprises lead sulfate and / or lead sulfide. A lead-containing compound is added into a waste lithium-containing material for roasting-water leaching, the leaching rate of lithium can be 99% or above, nickel / cobalt / manganese near-zero leaching can be achieved, the production cost of lithium extraction is reduced, and efficient extraction of lithium is achieved; the leaching rate of nickel / cobalt / manganese is 99% or above only by performing simple acid leaching on the water leaching residues, and lead is nearly zero leaching and exists in the acid leaching residues in the form of lead sulfate.

The invention belongs to the technical field of electrochemical energy storage, and relates to a zero-voltage attenuation lithium-rich positive electrode material, a preparation method and application thereof, the chemical general formula is Lix (Li < 1-y-z > Mn < y > Ni < z >) O < 2 >, xlt; 0.85, 0.5 lt; yt; Yt; 0.7, 0.1 lt; zlt, zlt; 0.3 part; the preparation method comprises the following steps: 1, preparing a sodium ion positive electrode precursor; 2, screening a sodium ion positive electrode precursor for the first time; 3, preparing a lithium-rich positive electrode material by combining a molten salt ion exchange method with secondary screening; according to the method, the structure rearrangement reaction occurring in situ during ion exchange is maximized through two screening procedures, so that the finally obtained lithium-rich positive electrode has the zero-voltage attenuation characteristic while having high capacity retention rate, and the long-term voltage attenuation problem of the lithium-rich positive electrode is effectively solved.

The invention provides a positive electrode material and a preparation method and application thereof.The positive electrode material comprises a base body and an island-shaped coating layer arranged on the surface of the base body, and the base body is a lithium ion layered oxide with an O2 phase stacking structure; the coating layer is selected from one or more of oxides of an element M, and the element M is selected from one or more of Al, Mg, Ti, Y, Zr, La, Ce, Pr, Si, Sn, Cu, W, Sm, Gd, In, Zn and Fe. According to the positive electrode material disclosed by the invention, the surface of the lithium ion layered oxide matrix with the O2 phase accumulation structure is coated with the specific island-shaped oxide coating layer, so that the positive electrode material has relatively high specific capacity, structural stability and positive electrode interface stability under high voltage, and further good cycle performance is obtained.

The invention relates to oxyfluoride solid electrolyte as well as a preparation method and application thereof. The general chemical formula of the oxyfluoride solid electrolyte material is Li < x > La < y > M < 1z > M < 2w > M < 3uO6F >, wherein M1 is a tetravalent cation, M2 is a pentavalent cation, and M3 is a hexavalent cation; 1 < x + 3y < 5, 0 < x < = 2, and 1 / 3 < y < 5 / 3; 0 < = z < = 2, 0 < = w < = 2, 0 < = u < = 2, z + w + u = 2; the density of the oxyfluoride solid electrolyte material is greater than 90%, and the purity is greater than 99%; the oxyfluoride solid electrolyte material is prepared from a nanoscale lithium source, a lanthanum source, an M1 source, an M2 source, an M3 source and a composite fluorine source through reaction, and the content of fluorine elements introduced through the composite fluorine source is 0.1%-8% more than the stoichiometric ratio of fluorine required in the oxyfluoride solid electrolyte material. The high-density and high-purity oxyfluoride solid electrolyte material provided by the invention has relatively high volume energy density, relatively low internal resistance and excellent ion conduction performance, is beneficial to improving rate capability, effectively slows down capacity fading and prolongs the cycle life of a battery.