3901results about "Nickel compounds" patented technology

The invention discloses a nickel-containing etching wastewater treatment process, which belongs to the technical field of environmental protection, and comprises a raw water regulating tank, a pH pre-regulating tank, a heterogeneous catalytic oxidation tower, a neutralization coagulation tank, an inclined tube sedimentation tank and a clean water tank which are connected in sequence. According to the process, under the neutral condition, a catalyst loaded with cobalt manganese oxide is used for activating sodium hydrogen persulfate, high-activity sulfate free radicals are generated, a Ni-EDTA complex structure is fractured in a targeted mode, free nickel ions are released in situ, organic ligands are synchronously mineralized, and the adding amount of sodium hydrogen persulfate is dynamically adjusted through a clean water pool closed-loop control system; and high-purity nickel hydroxide precipitate is generated through alkaline precipitation and coagulation, so that efficient solid-liquid separation is realized. The treatment process disclosed by the invention is compact in flow and stable in operation, effectively solves the problems of difficult complex breaking, low nickel removal efficiency, high sludge toxicity, difficult resource recovery and the like when the EDTA complex nickel wastewater is treated by a traditional method, realizes closed-loop recovery of nickel resources, and has the remarkable advantages of low cost, high efficiency and environmental friendliness.

The invention provides a high-stability lithium-rich manganese-based positive electrode material and a preparation method thereof, and relates to the technical field of lithium-rich manganese-based positive electrode materials, and the method comprises three steps of preparation of a homogeneous precursor, solid-state mechanical fusion doping and coating, and high-temperature sintering; a lithium-rich manganese-based precursor is prepared by adopting a homogeneous coprecipitation process, uniform distribution of metal ions is ensured, then an aluminum source, a zirconium source and a fluorine source are introduced as doping agents, phosphate and a titanate coating agent are combined, doping and coating integrated treatment is realized through mechanical ball milling, and the lithium-rich manganese-based composite material is obtained. And finally, mixing with a lithium source in an argon atmosphere, and carrying out high-temperature sintering of temperature programming and staged heat preservation to form a stable composite coating layer in situ. Therefore, manganese ion migration is effectively inhibited through lattice doping, a layered structure is prevented from being converted into spinel or rock salt phase, meanwhile, a nanoscale ion / electron transmission channel is constructed, interface impedance is reduced, and the charging and discharging efficiency under high voltage is improved.

The present invention relates to a positive electrode material including a plurality of single particle-based positive electrode active material particles, wherein the single particle-based positive electrode active material particle includes 1 to 30 primary particles, the product of an arithmetic mean value of the circularities of the primary particles and an arithmetic mean value of the convexities of the primary particles, which are measured from the segmentation image partitioned for each primary particle unit obtained by image-processing a scanning electron microscope (SEM) image of the positive electrode material, is at least 0.60, the circularity is defined by Equation 1 below, the convexity is defined by Equation 2 below, and the single particle-based positive electrode active material includes a lithium nickel-based oxide having a composition represented by Formula 1 below: Circularity=4πA / P2 wherein, in Equation 1 above, A is the area of each primary particle measured from the segmentation image, and P is the circumference of each primary particle measured from the segmentation image, Convexity=Pc / Pr wherein, in Equation 2 above, Pr is the actual circumference of each primary particle measured from the segmentation image, and Pc is the circumference of a virtual figure obtained by connecting the outermost points of each primary particle measured from the segmentation image, and         [Formula 1]     Lia[NixCoyM1zM21-x-y-z]O2 wherein, in Formula 1 above, M1 includes Mn, Al, or a combination thereof, M2 includes at least one selected from the group consisting of B, Ba, Ce, Cr, F, Mg, Al, V, Ti, Fe, Zr, Zn, Si, Y, Nb, Ga, Sn, Mo, W, P, and Sr, 1.0≤a≤1.3, 0.5≤x<1.0, 0<y<0.5, and 0<z<0.5.

The present invention relates to a positive electrode material comprising a plurality of single-particle-based positive electrode active material particles, each of which includes 1 to 30 primary particles, wherein the arithmetic average value of tortuosity of the primary particles as measured from a segmentation image divided for each primary particle unit, obtained by image processing of a scanning electron microscope (SEM) image of the positive electrode material, is 0.92 or greater, and the tortuosity is a value defined by equation (1). Equation (1): Tortuosity =Pc / Pr, where Pr is the real length of the perimeter of each primary particle measured in the segmentation image, and Pc is the length of the perimeter of a conceptual figure obtained by connecting outermost points of each primary particle measured in the segmentation image.

The present invention relates to a cathode material comprising a plurality of discrete-particle-based cathode active material particles. Each of the discrete-particle-based cathode active material particles comprises 1 to 30 primary particles, the ratio of the arithmetic average value of the circularities of the primary particles to the average aspect ratio of the primary particles, which is measured from a segmentation image segmented by primary particle unit and obtained through processing of a scanning electron microscope (SEM) image of the cathode active material, is 0.45 or more, the circularity is defined by the relation 1, and the discrete-particle-based cathode active material comprises a lithium nickel-based oxide having the composition represented by [chemical formula 1]. [Relation 1] Circularity = 4πA / P2 In relation 1, A is the area of each primary particle measured in the segmentation image, and P is the circumferential length of each primary particle measured in the segmentation image. [Chemical formula 1] Lia[NixCoyM1zM21-x-y-z]O2 In chemical formula 1, M1 includes Mn, Al or a combination thereof, M2 includes at least one selected from the group consisting of B, Ba, Ce, Cr, F, Mg, Al, V, Ti, Fe, Zr, Zn, Si, Y, Nb, Ga, Sn, Mo, W, P and Sr, 1,0≤a≤1.3, 0.5≤x<1.0, 0<y<0.5 and 0<z<0.5.

The invention provides a positive electrode active material and a preparation method thereof, a positive electrode and a solid-state battery, and particularly relates to the technical field of solid-state batteries. The positive electrode active material has a core-shell structure, and the core-shell structure comprises a core layer and a coating layer coating the core layer; the core layer is made of a lithium-rich manganese-based material; and the coating layer is made of a fast ion conductor and a halide solid electrolyte. The fast ion conductor in the coating layer of the positive electrode active material can improve the ionic conductivity of the surface layer of the positive electrode active material, promote rapid migration of lithium ions and assist in improving the initial coulombic efficiency. Meanwhile, the coating layer improves the chemical stability of the positive electrode active material, effectively inhibits the interface side reaction between the positive electrode body and the sulfide electrolyte, and relieves the structural degradation in the cycle process. The coating layer can also be used as a buffer layer to inhibit stress generated by volume shrinkage and expansion in charge and discharge cycles, maintain good contact of an electrode interface, and realize improvement of the electrochemical performance of the material.

The present invention relates to a positive electrode material comprising a plurality of single-particle-based positive electrode active material particles, each of which includes 1 to 30 primary particles, wherein the ratio of the arithmetic average value of the solidity of the primary particles to the average aspect ratio of the primary particles is 0.58 or more, as measured from a segmentation image divided for each primary particle unit, obtained by image processing of a scanning electron microscope (SEM) image of the positive electrode material, while the solidity is defined by equation 1, and the single-particle-based positive electrode active material includes a lithium-nickel-based oxide having a composition of [chemical formula 1]. [Equation 1] Solidity = Ar / Ac, where Ar is the real area of each primary particle measured in the segmentation image, and Ac is the area of a conceptual figure obtained by connecting outermost points of each primary particle measured in the segmentation image. [Chemical formula 1] Lia[NixCoyM1zM21-x-y-z]O2, where M1 includes Mn, Al, or a combination thereof, M2 includes at least one selected from the group consisting of B, Ba, Ce, Cr, F, Mg, Al, V, Ti, Fe, Zr, Zn, Si, Y, Nb, Ga, Sn, Mo, W, P, and Sr, and 1,0≤a≤1.3, 0.5≤x<1.0, 0<y<0.5, 0<z<0.5.

The present invention relates to a positive electrode material comprising a plurality of single-particle-based positive electrode active material particles. The single-particle-based positive electrode active material particles include 1 to 30 primary particles. The ratio of the arithmetic mean of the curvature of the primary particles to the average aspect ratio of the primary particles is at least 0.63 as measured from a segmentation image divided into units of primary particles and obtained by image-processing a scanning electron microscope (SEM) image of the positive electrode material. The curvature is defined by expression 1 below, and the single-particle-based positive electrode active material includes a lithium nickel-based oxide represented by chemical formula 1 below. [Expression 1]: Curvature = Pc / Pr In expression 1, Pr is the actual circumference of each primary particle measured in the segmentation image, and Pc is the circumference of a virtual figure obtained by connecting the outermost points of each of the primary particles measured in the segmentation image. [Chemical formula 1]: Lia[NixCoyM1zM21-x-y-z]O2 In chemical formula 1, M1 includes Mn, Al, or a combination thereof, M2 includes at least one selected from the group consisting of B, Ba, Ce, Cr, F, Mg, Al, V, Ti, Fe, Zr, Zn, Si, Y, Nb, Ga, Sn, Mo, W, P, and Sr, 1,0≤a≤1.3, 0.5≤x<1.0, 0<y<0.5, and 0<z<0.5.

To provide a positive electrode active material with high capacity and good cycle characteristics.SOLUTION: A positive electrode active material exhibits minimal change in crystal structure between the charged and discharged states. For example, a positive electrode active material that has a layered rock-salt crystal structure in the discharged state and a pseudo-spinel crystal structure in the charged state at a high voltage of about 4.6 V exhibits less change in crystal structure and volume between charge and discharge than known positive electrode active materials. When this pseudo-spinel crystal structure is present, diffraction peaks appear at 2θ=19.30±0.20° and 2θ=45.55±0.10° when analyzed by XRD.SELECTED DRAWING: Figure 1

The invention belongs to the technical field of nano materials, and relates to a carbon thermal reduction driven high-entropy oxide metastable-state material and a preparation method and application thereof.The preparation method comprises the steps that S1, carbon and soluble metal salt are dissolved in a solvent for ultrasonic treatment, and a metal salt solution and a carbon suspension are obtained; s2, adding a metal salt solution into the carbon suspension, adding strong base, and stirring to obtain a coprecipitation polymer; s3, re-dispersing the coprecipitation polymer in the solvent, adding extra ferric salt and urea, mixing and stirring, and freeze-drying the mixed solution to obtain precursor powder; s4, performing staged annealing treatment on the precursor powder under low oxygen partial pressure to obtain a carbon-loaded high-entropy oxide metastable-state material; the prepared high-entropy oxide metastable-state material is of an alloy phase and high-entropy oxide double-phase coupling structure, the polarization loss of electromagnetic waves is enhanced through a heterogeneous interface, and the high-entropy oxide metastable-state material has the advantages of being excellent in impedance matching and wide in electromagnetic wave absorbing bandwidth and can be widely applied to the fields of industrial electronics, medical communication and military stealth.

The invention discloses a high-entropy oxide composite negative electrode material as well as a preparation method and application thereof, and relates to the technical field of all-solid-state lithium battery negative electrode materials, and the high-entropy oxide composite negative electrode material comprises a metal element and an oxygen element, the high-entropy oxide composite negative electrode material comprises a metal element and an oxygen element, wherein the metal elements are at least five of a chromium element, an iron element, a nickel element, a manganese element, a molybdenum element, a copper element and a cerium element; the molar ratio of the metal element to the oxygen element is 3: 4; the high-entropy oxide composite negative electrode material is of a spinel structure. According to the prepared high-entropy oxide composite negative electrode material, the problems that a traditional negative electrode material is unstable in structure, poor in interface contact and short in cycle life are solved, the electrochemical performance is improved, and an all-solid-state lithium battery prepared from the high-entropy oxide composite negative electrode material shows high reversible specific capacity and excellent cycle stability.

The invention provides a method for preparing a high-voltage medium-nickel ternary positive electrode material by synergistic regeneration of a waste ternary lithium battery, which comprises the following steps: S1, taking a pretreated waste high-nickel and low-nickel ternary positive electrode material, calculating and supplementing a metal source and a lithium source according to the metal proportion of the actual content, and mixing the elements according to the total molar ratio of Li: (Ni + Co + Mn) = 1.0-1.1; s2, a composite fluxing agent containing lithium ion metal salt is added into the calibration mixture obtained in the S1, and two-stage sintering is carried out; and S3, coating the surface of the final product with a metal oxide aqueous solution corresponding to the lithium ion metal salt in the S2 as a coating agent to obtain the ternary positive electrode material. The nickel-rich characteristic of the high-nickel material and the manganese / cobalt-rich characteristic of the low-nickel material are utilized to form element complementation, so that the utilization rate of nickel, manganese and cobalt elements in the waste material is maximized, and the composition proportion limitation during regeneration of a single waste material is broken through.

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 provides a polycrystalline ultrahigh-nickel ternary positive electrode material and a preparation method thereof, a lithium ion battery and electric equipment, and relates to the field of lithium ion batteries. The polycrystalline ultrahigh-nickel ternary positive electrode material comprises an inner core, a first coating layer and a second coating layer, the chemical general formula of the inner core is LiNiXMyM 'ZO2; m comprises at least two of Co, Mn and Al, and M'comprises at least two of Zr, Sr, Y, Sb, Al, W, Ta, Mg, Ca, Ti, Mo and Nb; the first coating layer comprises a lithium-M ''multi-element oxidation compound, and M'' comprises at least two of Sb, Al, Co, Ti, W and P; the second cladding layer includes a lithium-M ''oxidation complex, and M'' includes one or more of B, Al, W, and Ti. The polycrystalline ultrahigh-nickel ternary positive electrode material has excellent high-temperature storage performance and capacity.

The invention relates to the field of lithium manganate positive electrode materials, in particular to a lithium manganate positive electrode material and a preparation method thereof, a positive electrode plate and a battery, which are used for solving the problems of Jahn-Teller distortion of Mn < 3 + >, Mn dissolution and low conductivity in circulation. Lithium carbonate, manganous-manganic oxide, potassium carbonate, aluminum nitrate and absolute ethyl alcohol are subjected to ball milling and then sintered to obtain K / Al co-doped lithium manganate powder, then the K / Al co-doped lithium manganate powder is coated with an acetylferrocene / diphenylamine polymer, finally, the K / Al co-doped lithium manganate powder is coated with an AlF3 (at) CeF3 suspension, and finally the lithium manganate positive electrode material is obtained. According to the lithium manganate positive electrode material, the electronic conductivity is greatly improved, the rate capability is improved, and the cycling stability is improved; and the material has excellent cycling stability and rate capability.

A modified lithium-rich manganese-based positive electrode material, and a preparation method therefor and the use thereof. The modified lithium-rich manganese-based positive electrode material comprises a lithium-rich manganese-based positive electrode material, wherein the bulk phase of the lithium-rich manganese-based positive electrode material is doped with a high-valent transition metal element, and the surface phase of the lithium-rich manganese-based positive electrode material has a lithium metal compound coating layer and an oxygen vacancy. In the modified lithium-rich manganese-based positive electrode material, the doping with a bulk-phase high-valence transition metal element, the coating with a surface-phase lithium metal compound coating layer and the construction of an oxygen vacancy are conducted at the same time; and by means of the co-action of the three, the rate capability and the cycling performance of the lithium-rich manganese-based positive electrode material can be significantly improved, which is of great significance for the further commercialization of the lithium-rich manganese-based positive electrode material.

The invention relates to the technical field of batteries, in particular to a core-shell material, a preparation method, a negative electrode material and a battery. The method provided by the invention comprises the following steps: processing metal salt raw materials of aluminum, iron, cobalt, nickel, zinc and lanthanum into a high-entropy metal oxide; taking silicon particles as a core layer, gasifying a high-entropy metal oxide, and depositing the gasified high-entropy metal oxide on the surface of the core layer to form a coating layer so as to obtain Si (at) HEO particles; depositing a zinc layer on the Si-coated HEO particles to form a growth layer on the surface of the coating layer, dispersing the Si-coated HEO particles in a Si-coated HEO solvent, adding a zinc nitrate aqueous solution and a 2-methylimidazole aqueous solution for reaction, and growing a shell layer on the growth layer on the surface of the coating layer to obtain Si-coated HEO-ZIF particles; and mixing the acidic solution and the Si (at) HEO (at) ZIF particles to form a secondary pore channel, and separating to obtain the core-shell material. The core-shell material provided by the invention solves the problems of low stress dispersion efficiency, low ion transmission and poor volume expansion rate of the existing core-shell material.

This positive electrode active material for nonaqueous electrolyte secondary batteries contains a lithium transition metal composite oxide that is represented by composition formula LixMnyNizPaMbO2-cFc(wherein M represents at least one element that is selected from among Ti, Co, Si, Sr, Nb, W, Mo, Ca, Mg, Sb, Na, B, V, Cr, Fe, Cu, Zn, Ge, Zr, Ru, K and Bi; 1.0<x≤1.2; 0.4≤y≤0.8; 0≤z≤0.4; 0<a<0.01; 0<b<0.05; 0<c<0.1; and (x+y+z+a+b)≤2).

The invention discloses a sodium ion battery positive electrode material as well as a precursor, a preparation method and application thereof. The chemical formula of the sodium ion battery positive electrode material precursor is NiaFebMncCudZeMef (OH) 2, wherein 0 < = a < = 0.4, 0 < = b < = 0.5, 0 < = c < = 0.6, 0 < = d < = 0.15, and 0 < = ilt; 0.15, 0 < = f < = 0.05, (a + b + c + d + e + f) = 1, and Me is selected from one or more than two of Ce, Nb, Ta, La, Mo and W; and the content of Me in the precursor of the positive electrode material of the sodium-ion battery is linearly increased along the direction from the body center to the surface of the precursor material. According to the invention, the content of the final doping element is linearly increased from the inside of the particle to the outside by controlling the speed of introducing the nickel source, the manganese source, the iron source, the copper source, the zinc source and the Me source into the reaction kettle in each period of time and the reaction time of each system. The precursor and a sodium source in a proper proportion are uniformly mixed and sintered to obtain the gradient-doped sodium ion battery positive electrode material, and the positive electrode material has good cycle performance, rate capability and relatively high reversible specific capacity.

The invention discloses a lithium supplement agent which comprises a lithium supplement inner core and a carbon coating layer coating the surface of the lithium supplement inner core, and the lithium supplement inner core is doped with an Al element; the lithium supplementing agent meets the condition that A / I is larger than or equal to 0.3 and smaller than or equal to 4, A is the mass ratio of the Al element in the lithium supplementing agent, and I is the ID / IG value of the lithium supplementing agent in a Raman spectrogram. By regulating and controlling the A / I ratio of the Al doping amount to the carbon coating layer structure, the lithium supplementing capacity, the conductivity and the air stability are improved, and meanwhile, the gas production phenomenon in the lithium removal process is effectively inhibited.

The invention relates to a lithium ion battery positive electrode material regeneration method based on the synergistic effect of Nb < 5 + > / Ta < 5 + > / Mo < 6 + > doping and molten salt reconstruction, and belongs to the technical field of lithium battery material recovery and regeneration, a high-temperature molten salt system represented by LiOH-NaCl / Na2SO4 is adopted, NbCl5 / TaCl5 / MoCl6 is introduced as a dopant, and synchronous implementation of structure repair and Nb < 5 + > / Ta < 5 + > / Mo < 6 + > doping is realized in the lithium supplement reconstruction process, so that the lithium supplement reconstruction process is simplified, and the lithium ion battery positive electrode material regeneration method is suitable for large-scale popularization and application. Meanwhile, various structural defects such as lithium vacancies, cation mixing, lattice oxygen loss and particle cracks in the retired high-nickel positive electrode material are repaired, doped elements enter lattices at high temperature to form high-bond-energy O-TM bonds, surface lattice oxygen can be effectively anchored, oxygen vacancy generation and oxygen separation are inhibited, and the service life of the positive electrode material is prolonged. Therefore, the structural stability of the regenerative positive electrode under high voltage is remarkably improved. Meanwhile, a lithium ion diffusion channel is widened by doping Nb < 5 + > / Ta < 5 + > / Mo < 6 + >, the material has more excellent rate capability and long cycle stability in combination with a grain boundary elimination effect brought by crystal reconstruction, and the material has wide adaptability and good industrial popularization prospects.

The present invention relates to a positive electrode active material for a lithium secondary battery, which is a nickel-containing layered lithium transition metal oxide, wherein the positive electrode active material has an average particle diameter (D50) from 5 to 8 µm, comprises single particles consisting of one primary particle and quasi-single particles having a spherical shape consisting of a plurality of primary particles, and satisfies the following Equation 1: 1.2μm≤D50−D50p≤1.8μm wherein D50 is the average particle diameter (D50) of the positive electrode active material before application of a pressure of 9 tons, and D50p is the average particle diameter (D50) of the positive electrode active material after application of a pressure of 9 tons.

The invention discloses a regeneration method of a positive electrode active material, a regenerated positive electrode active material and a battery, and belongs to the technical field of regeneration of positive electrode active materials. The method comprises the following steps: mixing a positive electrode active material and a lithium salt, heating and preserving heat to obtain eutectic molten salt in a molten state, and inducing the eutectic molten salt to generate a cavitation effect. The molten lithium salt in the eutectic molten salt can supplement lithium ions lost by the positive electrode active material and repair and regenerate the positive electrode active material, the eutectic molten salt in the molten state is a carrier of the cavitation effect, the cavitation effect can further promote repair and regeneration of the positive electrode active material in the eutectic molten salt, and the two are combined to generate a synergistic effect; the regeneration of the retired lithium ion positive electrode active material is improved in situ in one step, so that the regenerated positive electrode active material with relatively high capacity retention ratio can be obtained, and the remanufacturing requirement of a vehicle-specification-grade power battery is met.

The invention belongs to the technical field of preparation of sodium ion battery electrode materials, and provides a high-performance sodium storage material based on Zn-doped modified P2 type sodium nickel manganese oxide, a preparation method and a battery. The invention aims to solve the problems of rapid capacity attenuation under high voltage, obvious volume change in the phase change process, irreversible capacity loss and the like of the existing P2 type sodium nickel manganese oxide material. According to the main technical scheme, through low-concentration Zn doping, the structural stability of the material is optimized, and the electrochemical performance of the material is improved on the premise that voltage, capacity and energy density are not sacrificed. The preparation method comprises the following steps: dissolving a sodium source, a manganese source, a nickel source and a zinc source, adding a complexing agent for reaction, evaporating the solvent to dryness, and performing two-stage calcination to finally obtain the zinc-doped sodium-nickel-manganese oxide with the P2 type layered structure. The material can be used for high-safety sodium ion battery positive electrodes and is widely applied to the fields of energy storage power stations, low-speed electric vehicles and the like.

The invention provides a single-crystal cobalt-free lithium-rich manganese-based positive electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a cobalt-free lithium-rich manganese-based precursor material, a lithium source and a grain boundary separation auxiliary agent to obtain a mixed material; the mixed material is subjected to two-stage sintering, the two-stage sintering comprises first sintering and second sintering in sequence, and the single-crystal cobalt-free lithium-rich manganese-based positive electrode material is obtained, wherein primary crystal grains of the cobalt-free lithium-rich manganese-based precursor material are of a sheet structure. According to the invention, the cobalt-free lithium-rich manganese-based precursor material of which the primary crystal grains are of a sheet structure is taken as a raw material, and under the action of the grain boundary separation auxiliary agent, a two-stage sintering process is cooperatively matched, so that the single-crystal cobalt-free lithium-rich manganese-based positive electrode material which is uniform in grain size, high in dispersity, complete in crystal grains and continuous in interface is obtained, and the cobalt-free lithium-rich manganese-based positive electrode material is not only suitable for a liquid lithium ion battery, but also suitable for a lithium ion battery. The material is more suitable for a solid-state lithium ion battery, and the electrochemical performance of the battery is effectively improved.

The preparation method of the Ni-Mn bimetallic oxide modified magnesium-based hydrogen storage composite material comprises the steps that 1, under the protection of an argon atmosphere, pure magnesium powder is placed in a reaction kettle, and a product MgH2 is obtained; step 2, dissolving nickel nitrate hydrate and manganous nitrate hydrate in absolute ethyl alcohol, adding urea into the mixed solution, continuously stirring at room temperature, and then carrying out constant-temperature reaction in a tetrafluoropolyvinyl chloride high-pressure reaction kettle in a drying oven; after the reaction is finished, cooling to room temperature, and carrying out centrifugal washing; supernate obtained after centrifugal washing is poured out, precipitates are reserved and transferred into a vacuum drying box, and vacuum drying is conducted; grinding a block obtained after drying, and transferring the block into a tubular furnace for heat treatment to obtain a bimetallic oxide NiMn2O4; 3, MgH2, NiMn2O4 and stainless steel ball milling beads are weighed and put into a mechanochemical reaction ball milling kettle, intermittent ball milling is conducted for a certain time under the protection of a specific atmosphere, and then a composite sample MgH2-NiMn2O4 is collected. The practical application benefit of the magnesium-based hydrogen storage technology can be greatly improved.

A core-shell ternary precursor and a preparation method therefor, and a positive electrode material. The core-shell ternary precursor comprises a core and a shell that coats the core. The core is expressed as NixCoyMnz(OH)2-a(WO4)a, wherein x is greater than 0, but less than 1; y is greater than 0, but less than 1; z is greater than 0, but less than 1; x+y+z=1; and the value range of a is 0.01-1. The shell contains aluminum. By means of a combination of tungsten doping and aluminum doping, the advantages of the both are incorporated, and a high-performance precursor is prepared. In addition, the core-shell precursor can effectively improve the surface structure of a precursor, suppress the propagation of cracks on the surface of a high-nickel large-particle precursor, and also effectively inhibit the corrosion of a positive electrode material by an electrolyte, thereby prolonging the battery life.

Provided is an all-solid-state lithium batteries (ASSLBs), Li-based cathode materials and structures incorporated therein and to methods of producing said materials, structures and batteries.

The invention discloses a ternary positive electrode material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The method comprises the following steps: modifying a ternary matrix material in a composite doping manner of rare earth elements and transition metals, and then coating the surface of the material with a layer of amorphous ferric fluoride in a manner of combining atomic layer deposition with fluorination reaction. The ternary positive electrode material provided by the invention has higher rate capability and better cycling stability, and can maintain better chemical performance under high current density, so that the problems of capacity loss and poor electrical performance of the ternary positive electrode material of the lithium battery in a high-voltage long-cycle process are greatly relieved.

The invention relates to the technical field of battery sodium supplementation agents, in particular to a sodium supplementation agent with a core-shell structure, a preparation method and a positive pole piece. The preparation method comprises the following steps: providing a core material containing sodium salt; a first coating process: providing a first coating material containing organic fluorine, mixing the core material containing the sodium salt with the first coating material, and performing first sintering to obtain a primary coating coated with a first coating layer; and a second coating process: providing a second coating material containing a carbon source, mixing the second coating material with the primary coating, and carrying out second sintering to obtain the sodium supplement which is coated with a first coating layer and a second coating layer and has the core-shell structure. The invention provides the sodium supplementing agent with the core-shell structure, the preparation method and the positive pole piece, so that the problem of poor sodium supplementing performance of the sodium supplementing agent in the related technology is solved.