312results about "Borates" patented technology

The invention discloses a series of alkali metal borate compounds and alkali metal borate crystals as well as a preparation method and application thereof, and belongs to the technical field of photoelectric functional crystal materials. The chemical general formula of the series of compounds and crystals thereof is A3RE (B3O6) 2, wherein A is K, Rb, Cs or NH4; rE = Sc and Y, the molecular weight is 355.93-744.48, the series of crystals belong to a trigonal system, the space group is P321, the cell parameters a = b = 10.5237 (13)-135237 (13), and # imgabs0 # Z = 3. The series of alkali metal borate compounds are synthesized by adopting a solid-phase reaction method or a hydrothermal method, and the series of crystals grow by adopting a high-temperature melt method or a hydrothermal method or a solution method. The series of materials can be used for manufacturing second harmonic generators, upper and lower frequency converters, optical parametric oscillators, polarizing prisms and the like.

The invention discloses a lithium-rich manganese-based positive electrode material with a core-shell structure, the general formula of the lithium-rich manganese-based positive electrode material is Li < 1 + a > Mn < x > Co < y > Ni < z > O < 2-b-d > (XOc) X < d >, the lithium-rich manganese-based positive electrode material has the core-shell structure, the core is a lithium-rich manganese-based material Li < 1 + a > Mn < x > Co < y > Ni < z > O < 2-b > (XOc) doped with disordered polyanions, and the shell is a lithium-rich manganese-based material Li < 1 + a > Mn < x > Co < y > Ni < z > O < 2-d > X < d > doped with gradient non-metal ions. The invention also provides a preparation method of the lithium-rich manganese-based positive electrode material with the core-shell structure, and the lithium-rich manganese-based positive electrode material with the core-shell structure is prepared by adopting a combined means of rapid Joule heat treatment and surface plasma cleaning treatment. The polyanion-doped bulk phase disordered structure design and the surface gradient non-metal ion-doped core-shell structure are realized. Wherein the bulk phase polyanions can fix transition metal elements to inhibit migration of the transition metal elements to a lithium layer, harmful consumption of active sites is reduced, and a lattice structure is stabilized. In addition, strong bond energy between surface nonmetal and transition metal elements can inhibit dissolution of transition metal in the circulation process, irreversible oxidation of oxygen is reduced, and generation of harmful phase change is inhibited.

The invention discloses a multi-metal borate nano-particle as well as a preparation method and application thereof. The preparation method comprises the following steps: in the presence of small molecules with alkyl chains, performing high-temperature thermal decomposition on an organic metal compound or a metal salt compound precursor and organic borate in a solvent, and then centrifuging, modifying, performing ultrafiltration, dialyzing and purifying to obtain the multi-metal borate nanoparticles. The preparation method disclosed by the invention has the characteristics of mildness, high efficiency and strong controllability. The multi-metal borate nanoparticles prepared by the preparation method disclosed by the invention have the advantages of monodisperse size, relatively high magnetic property and good biocompatibility. Therefore, the prepared multi-metal borate nanoparticles not only have multi-modal imaging functions such as magnetic resonance imaging, near-infrared two-region imaging, nuclear medicine imaging and magnetic particle imaging, but also can be used for various treatment means such as magnetocaloric therapy and boron neutron capture therapy; potential advantages are realized in biomedical applications such as magnetic targeting tumor treatment and imaging contrast agents, and high practical values are realized.

A layered oxide positive electrode material and a preparation method therefor, a positive electrode composition, a sodium-ion secondary battery and the use. The layered oxide positive electrode material has the following general formula: NaaNibCucMndTieMfOg, wherein M is a doping element, a=0.75-0.95, b=0.33-0.45, c=0.03-0.15, d=0.20-0.45, e=0.05-0.20, f=0-0.1, and g=1.80-2.20. In an XRD pattern of the layered oxide positive electrode material, the peak intensity ratio I(101) / I(003)=0.02-0.15, the peak intensity ratio I(101) / I(012)=0.35-0.47, and the peak intensity ratio I(101) / I(006)=0.08-0.57.

The present invention relates to the field of battery materials, and provides a lithium manganate cathode material coated with lithium triborate and a preparation method thereof. The cathode material is a porous lithium manganate / lithium triborate composite electrode material, which includes porous lithium manganate with a highly connected directional columnar pore structure and a lithium triborate coating covering the pore surface, with a mass ratio of (86.0~92.0):(8.0~14.0), a coating thickness of 600~800 nm, a pore diameter of 45~95 μm, and a porosity of 65~78%. The preparation method includes: preparing a precursor colloidal solution by the sol-gel method, obtaining porous lithium manganate through low-temperature freezing molding and freeze-drying, and forming a cathode substrate through pre-oxidation and high-temperature sintering; subsequently, using vacuum-assisted impregnation, ultrasound, and nitrogen pressure to promote the penetration of the lithium triborate precursor solution, and forming a uniform coating layer through gradient drying and annealing treatment. The present invention significantly improves the crystal structure stability of the cathode material, inhibits manganese dissolution, improves the cycle life and rate performance, and has wide application value.

The invention relates to the technical field of sodium ion battery positive electrode materials, in particular to a boric acid modified ternary layered oxide positive electrode material and a preparation method and application thereof. The chemical general formula of the boric acid modified ternary layered oxide positive electrode material is Na2 / 3Ni1 / 3Co1 / 3Mn1 / 3BxO, and x is more than 0 and less than or equal to 0.09; the boric acid modified ternary layered oxide positive electrode material is subjected to boric acid modification treatment and comprises interstitial doping of boron elements and a surface BO coating layer, the interstitial doped boron elements are located at tetrahedral sites of a transition metal layer, and the thickness of the BO coating layer is 3 nm to 10 nm. The boric acid modified ternary layered oxide positive electrode material prepared by the invention shows high specific capacity, good cycling stability and excellent rate capability in the sodium ion battery, and meanwhile, the preparation method disclosed by the invention has the advantages of simple preparation process, high cost effectiveness and the like, and has a wide application prospect.

The invention provides a borate modified positive electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: 1) dissolving polyol, metal salt, boric acid and alkali in a solvent, and reacting to form a mixed solution; 2) dispersing a coated substrate material in the mixed solution formed in the step 1) to obtain a turbid solution; (3) carrying out stirring reaction on an anti-solvent and the turbid solution formed in the step (2), centrifuging, washing and drying to obtain substrate powder coated with metal boric acid precursor species; and 4) calcining the substrate powder formed in the step 3) to obtain the borate modified positive electrode material. The metal borate modified positive electrode material particles obtained by the invention can be used as a positive electrode of a high-specific-energy lithium ion battery or lithium battery with high cycle stability and long service life.

The invention discloses an oxide-coated ion-doped sodium ferric sulfate positive electrode material as well as a preparation method and application thereof. The positive electrode material is formed by compounding a sodium ferric sulfate bulk phase material doped with various valence metal cations and anions and coated with carbon similar to a positive temperature coefficient thermosensitive metal oxide. Wherein the metal cations with various valence states are doped on Na or Na / Fe ion sites of the sodium ferric sulfate, the doped anions occupy part of three-dimensional S-O tetrahedron positions, the inorganic carbon in the carbon compound is uniformly distributed in the sodium ferric sulfate bulk phase material, and the organic carbon is uniformly distributed outside the sodium ferric sulfate bulk phase material. The positive electrode plate assembled battery prepared from the positive electrode material has the advantages of high reversible charge-discharge capacity, excellent cycle performance and rate capability and high electron and ion migration rate in a low-temperature environment. The method is low in raw material cost, simple in synthesis method, short in production period and suitable for large-scale continuous production.

The invention discloses an oxide solid electrolyte coated lithium manganese iron phosphate positive electrode material and a preparation method thereof, and relates to the technical field of lithium manganese iron phosphate preparation. The lithium manganese iron phosphate battery comprises a lithium manganese iron phosphate core and an oxide solid electrolyte coating layer, the oxide solid electrolyte coating layer comprises Li < 7 > La < 3 > Zr < 2 > O < 12 > (LLZO), Li < 6.75 > La < 3 > Zr < 1.75 > Ta < 0.25 > O < 12 > (LLZTO, Li < 3 > x La < 2 / 3-x > TiO < 3 > (LLTO), Li < 3 > BO < 3 > (LBO) and Li < 1 + x > Al < x > Ti < 2-x > (PO4) < 3 > (LATP); the lithium manganese iron phosphate core is LiMnxFe1-xPO4, wherein x is more than or equal to 0.5 and less than or equal to 0.8; the existing main problem of lithium manganese iron phosphate is solved, the comprehensive performance is improved, and the commercial application is promoted.

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.

A positive electrode active material includes a lithium nickel complex oxide having a hexagonal crystalline layered structure and containing secondary particles in which a plurality of primary particles are aggregated. The lithium nickel complex oxide contains Li, Ni, B, and element M at a ratio by mole of Li:Ni:B:M=a:b:c:d (where 0.95≤a≤1.10, 0.50≤b<1.00, 0.00<c≤0.03, 0.00≤d≤0.47, b+c+d=1, and element M is at least one element selected from Mn, Co, V, Mg, Mo, Ca, Cr, Zr, Ta, Ti, Nb, Na, W, Fe, Zn, Si, Sn, Cu, P, and Al). In a titration curve obtained from neutralization titration of the positive electrode active material, a volume ratio of an HCl dropping amount in a range having a pH of higher than 11.0 to an HCl dropping amount in a range having a pH of 8.0 or higher and 11.0 or lower is 2.0 or less.

The invention discloses pure inorganic stimuli-responsive sol as well as a preparation method and application thereof, inorganic sol with stimuli-responsive performance is prepared from an inorganic nano-material with positive electricity, and the technical problem of conversion from one-dimensional inorganic nano-material sol to gel is solved. Compared with a means of providing positive electricity for the one-dimensional inorganic nano material through a modification means, the one-dimensional inorganic nano material carrying the positive electricity only needs cheap inorganic matters in cost, and the convenience and cost of the one-dimensional inorganic nano material carrying the positive electricity have qualitative changes in further processing and practical application; the adjustment of the acting force between one-dimensional inorganic nano materials can be realized without replacing ligands, and the method has extremely high advantages in the aspect of realizing the sol-gel conversion capability of stimulation response. The method disclosed by the invention is relatively low in cost and simple and convenient to operate, and the prepared hydrogel not only has relatively good mechanical properties, but also has relatively good stimulation response capability, is a material capable of realizing comprehensive application, and is wide in application scene.

A negative electrode active material for a non-aqueous electrolyte secondary battery according to one example of an embodiment comprises composite particles (30) that include a lithium aluminate phase (31) and a silicon phase (32) dispersed in the lithium aluminate phase (31). The lithium aluminate phase (31) contains boron, and the ratio (MAI / MB) of the aluminum percentage content (MAI) and the boron percentage content (NIB) with respect to the total amount of the elements other than oxygen constituting the lithium aluminate phase (31) and the silicon phase (32) is 1.0-30.0, inclusive.

The invention provides a positive electrode material, a method for preparing the positive electrode material, a positive electrode plate, a battery and an electric device. The positive electrode material comprises an inner core and a shell wrapping the inner core, each of the inner core and the shell comprises primary particles, most of the primary particles in the inner core are distributed in the radial direction of the inner core, and the distribution of most of the primary particles in the shell is different from the radial distribution of the inner core. The particle strength of the positive electrode material is improved, so that the cycle life, the high-temperature storage performance and the energy density of the battery are improved.

A particulate nanocomposite material comprising, as determined by X-ray diffraction (XRD): elemental carbon (C); elemental nickel (Ni) in a cubic crystalline phase; a cubic nickel oxide (NiO) crystalline phase; an orthorhombic calcium borate (CaB2O4) crystalline phase; and, a magnesium borate (MgB2O4) crystalline phase. The porous particulate nanocomposite is characterized in that, based on the total number of atoms in the particulate nanocomposite material: the atomic concentration of carbon is from about 1 atomic percent (at. %) to about 10 at. %; the atomic concentration of nickel is from about 1 at. % to about 10 at. %; the atomic concentration of boron (B) is from about 1 at. % to about 10 at. %; the atomic concentration of magnesium (Mg) is from about 5 at. % to about 15 at. %; and, the atomic concentration of calcium (Ca) is from about 1 at. % to about 10 at. %.

An electrode active material includes: a core active material having a layered structure and capable of reversibly incorporating and deincorporating lithium; a dopant including boron and a first metal element, wherein the dopant is in the core active material; and a nanostructure disposed on a surface of the core active material and including a metal borate compound including a second metal element, wherein the second metal element is the same as the first metal element.

The utility model relates to the technical field of salt lake boron resources, and particularly discloses a crystallization system for preparing borax from salt lake brine, which comprises a first hot melting batching tank, a second hot melting batching tank, a first set of crystallization tank, a second set of crystallization tank, a buffer tank and a centrifugal machine, the first crystallization tank comprises a first crystallization tank, a second crystallization tank, a third crystallization tank and a fourth crystallization tank, the second crystallization tank comprises a fifth crystallization tank, a sixth crystallization tank, a seventh crystallization tank and an eighth crystallization tank, the first hot melting batching tank collects borax mother liquor, and the borax mother liquor is mixed with a surface active additive and then enters the first crystallization tank in sequence; after the first set of crystallizing tank is cooled to a certain temperature, the materials enter a second hot-melting batching tank in a manner of introducing the discharged materials into a groove, and the materials in the second hot-melting batching tank are sequentially pumped into the second set of crystallizing tank through a pump, are continuously cooled to a certain temperature, enter a buffer tank and then enter a centrifugal machine to be separated; according to the utility model, accurate temperature and time control is carried out on two-stage cooling crystallization, and the device has the characteristics of large borax grains and no caking of products.

The mixed powder is a mixed powder for an annealing separator containing MgO as a main agent, wherein an average particle size of the mixed powder is 0.10 µm or more and 8.50 µm or less, the mixed powder contains B, and a B content contained in the entire mixed powder is 0.005 mass% or more and less than 0.040 mass%, a proportion of tri-coordinated boron in the B is 5 mass% or more and less than 70 mass%, and a ratio of a circumferential length to a thickness of primary particles containing the MgO is 6.0 or more.

The invention relates to the technical field of graphene modification, and particularly discloses a preparation method of zinc borate modified graphene, which comprises the following steps: ultrasonically dispersing graphene in water to obtain 0.5-1g / L graphene dispersion liquid; adding a dispersing agent, a 0.08-0.12 mol / L borax aqueous solution and ethanol into the graphene dispersion liquid, uniformly mixing, and then dropwise adding a 0.08-0.12 mol / L zinc sulfate aqueous solution under the stirring action; then carrying out a reaction through microwave heating at the temperature of 50-70 DEG C under the power of 100-300 W for 20-30 min; after the reaction is finished, filtering, washing and drying to obtain zinc borate modified graphene. According to the preparation method of the zinc borate modified graphene, provided by the invention, a uniform, complete and compact shell layer can be formed on the surface of the graphene through in-situ self-assembly, so that the surface of the graphene is textured, and the dispersion uniformity and dispersion stability of the graphene in an oil phase system are improved.

The utility model discloses a carbon decomposition device for producing borax decahydrate by using high-concentration carbon dioxide. The carbon decomposition device comprises nine carbon decomposition tanks, every three carbon decomposition tanks form a group, and three groups are connected in parallel; the upper part of each carbon decomposition tank comprises a serial-in end head, a carbon dioxide main pipe end head connected with a carbon dioxide main pipe, a discharging main pipe end head connected with a discharging main pipe, a feeding main pipe end head connected with a feeding main pipe, an emptying main pipe end head connected with an emptying main pipe, a tail gas main pipe end head connected with a tail gas main pipe and a serial-out end head; in each group, the serial-in end of each carbon decomposition tank is connected with the serial-out end of the adjacent carbon decomposition tank in series; a steam header pipe end connected with a steam header pipe is arranged on the side wall of the carbon decomposition tank; a steam condensate pipe is arranged at the lower part of the carbonolysis tank. According to the utility model, three tanks are connected in series for carbon decomposition reaction, so that the fluctuation of carbon dioxide pressure during discharging is reduced, the stability of system pressure is facilitated, and the absorption and carbon decomposition reaction of carbon dioxide are facilitated.

The invention belongs to the technical field of positive electrode materials, and provides a lithium-rich manganese-based positive electrode material and a preparation method and application thereof. The preparation method comprises the following steps: mixing a manganese-based metal ion solution, a precipitator solution and a complexing agent solution to obtain a manganese-based composite material precursor suspension, and drying to obtain a precursor; mixing the precursor with a lithium source, and then sequentially mixing and reacting with a phosphate radical source, a borate radical source and a niobium source to obtain a phosphorus boron niobate coated precursor; and mixing the precursor with a lithium source, and sintering. The invention also discloses the lithium-rich manganese-based positive electrode material prepared by the method. The positive electrode of the lithium ion battery comprises the positive electrode material. The lithium-rich manganese-based positive electrode material disclosed by the invention has a gradient coating structure, and the structure enables the positive electrode material to be high in capacity, good in cycle performance and less in interface side reaction; according to the invention, an in-situ co-firing bonding process is adopted, and a liquid-phase impregnation-segmented sintering integrated process is adopted, so that chemical bonding of a coating layer and a matrix is realized, interface falling is avoided, and the structural stability is enhanced.

The invention belongs to the field of sodium-ion batteries, and discloses a high-voltage-resistant sodium-ion battery positive electrode material which comprises a core layer and a coating layer, the chemical formula of the core layer is Na < x > Ca < y > (NiFeMn) < 0.33 > x (1-z-e) Al < z > Mg < e > O < 2 >; the chemical formula of the coating layer is Na3La2 (BO3) 3. (AFm) n; 0.99 < = x + y < = 1.04, 0.01 < = y < = 0.05, 0.01 < = z < = 0.1, 0 < = n < = 0.05, 0.0023 < = e < = 0.023; a is Ca and / or Al, and m is the valence state of the A element. According to the positive electrode material, through doping and coating of the core layer, the stability of the core layer material, the coating material and the interface stability of the core layer material and the coating material are realized, particularly, the surface stability of the doped core layer is remarkably improved, and the capacity and the cycle performance under the condition of high voltage are improved. Meanwhile, the invention also provides a preparation method of the high-voltage-resistant sodium-ion battery positive electrode material.

The invention provides a high-compaction phosphate positive electrode material, a preparation method thereof and a lithium ion battery positive electrode, the phosphate positive electrode material comprises a phosphate core and a B-C composite coating layer coating the surface of the phosphate core, and the B-C composite coating layer comprises BC3, borate and amorphous carbon; the general formula of the borate is MxByOz, M comprises Li and / or Fe, x is 1-3, y is 1-4, and z is 3-7; the preparation method comprises the following steps: mixing a phosphate precursor material, a boron source and a carbon source, and sequentially carrying out ball milling and sintering to obtain the high-compaction phosphate positive electrode material. According to the invention, the boron source can be melted at a high temperature and is used as a fluxing agent to reduce the surface tension of particles, improve the morphology of the particles and improve the compaction density of the phosphate positive electrode material.

This invention discloses a core-shell structured lithium-rich manganese-based cathode material with the general formula Li. 1+a Mn x Co y Ni z O 2‑b‑d (XO c ) b X d It has a core-shell structure, with the core being a disordered polyanion-doped lithium-rich manganese-based material, Li. 1+a Mn x Co y Ni z O 2‑b (XO c ) b The outer shell is made of lithium-rich manganese-based material Li, which is doped with gradient non-metallic ions. 1+ a Mn x Co y Ni z O 2‑d X d This application also provides a method for preparing a core-shell structured lithium-rich manganese-based cathode material. The method employs a combination of rapid Joule heating and surface plasma cleaning to prepare the aforementioned core-shell structured lithium-rich manganese-based cathode material, achieving a bulk disordered structure design with polyanion doping and a core-shell structure with surface gradient non-metallic ion doping. Specifically, the bulk polyanions can immobilize transition metal elements to suppress their migration to the lithium layer, reducing harmful consumption of active sites and stabilizing the crystal structure. Furthermore, the strong bond energy between the surface non-metallic elements and the transition metal elements can suppress transition metal dissolution during cycling, reducing irreversible oxygen oxidation and inhibiting harmful phase transitions.

The invention provides a coated microcrystal lithium-rich manganese-based positive electrode material as well as a preparation method and application thereof. The positive electrode material is a lithium-rich manganese-based positive electrode material which is prepared from a lithium-rich manganese-based precursor and has primary particles formed in situ and secondary spheres with surface coatings. The positive electrode material has a unique core-shell structure, the core is a microcrystal lithium-rich material, the shell is a nanoscale solid electrolyte layer, and the shell layer coats primary particles and secondary spheres at the same time; the structure effectively inhibits the interface side reaction between the positive electrode material and the solid electrolyte, and stabilizes the interface structure; a continuous and short Li and charge transmission path is provided, the interface impedance in an all-solid-state battery is remarkably reduced, and the rate capability and the cycling stability of the material are improved.

The invention belongs to the technical field of lithium ion battery materials, and particularly relates to a lithium-rich manganese-based positive electrode precursor material, a preparation method thereof, a positive electrode material and a battery. The lithium-rich manganese-based positive electrode precursor material comprises an inner core and a shell layer on the surface of the inner core, the inner core is formed by staggered arrangement of sheet-shaped primary particles, the shell layer is formed by radial arrangement of plate-shaped primary particles perpendicular to the surface of the inner core along a diametral plane, so that a loose-inside and tight-outside structure is formed, and the precursor material of the structure is good in stability and good in stability. And the lithium-rich manganese-based positive electrode material prepared from the lithium-rich manganese-based positive electrode material also has good cycling stability. The lithium-rich manganese-based positive electrode precursor material is prepared through a two-step coprecipitation method, and the preparation method is simple and controllable.

The invention discloses a modified solid-state electrolyte and a preparation method and application thereof, and relates to the field of solid-state batteries, in 300 crystal face grain size distribution of the modified solid-state electrolyte, Kn90 = (Ln90-Ln10) / Ln50, and Kn90 is more than or equal to 0.5 and less than or equal to 1.7; wherein Ln10 is the corresponding grain size when the volume distribution cumulative percentage of the 300 crystal face sub-grain size Ln of the modified solid electrolyte reaches 10%, and Ln50 is the corresponding grain size when the volume distribution cumulative percentage of the 300 crystal face sub-grain size Ln of the modified solid electrolyte reaches 50%; ln90 is the corresponding grain size when the volume distribution cumulative percentage of the 300 crystal face sub-grain size Ln of the modified solid electrolyte reaches 90%. According to the invention, the modified solid electrolyte has excellent ionic conductivity, good air stability, interface stability to metal lithium and relatively high oxidation potential stability.

The present invention provides a vapor deposition method for preparing an amorphous lithium borosilicate or doped lithium borosilicate compound, the method comprising: providing a vapor source of each constituent element of the compound, wherein the vapor source comprises at least a lithium source, an oxygen source, a boron source, and a silicon source, and optionally a source of at least one dopant element; conveying streams of the lithium, the oxygen, the boron, and the silicon, and optionally the dopant element; and co-depositing the constituent elements from the vapor source on a substrate, wherein the constituent elements react on the substrate to form an amorphous compound; wherein the amorphous lithium borosilicate or doped lithium borosilicate compound has a lithium content in the range of 40 - 65 atomic %, based on the atomic percentage of the combination of lithium, boron, and silicon.

The invention provides a positive electrode active material, a preparation method thereof, a positive electrode plate containing the positive electrode active material, a full-tab battery cell and an electric device, and relates to the technical field of lithium ion batteries. The positive electrode active material is of a double-spherical particle structure with a glass-phase neck bridge at a contact neck part, each spherical particle comprises an active material body and a coating layer coating the active material body, and the active material body is lithium iron phosphate dispersed with Fe2P; the average thickness tsh of the coating shell layer is equal to 5 to 9 nm; the thickness tcheck of the glass phase neck bridge is 5-25nm, and the total content G of the glass phase in the positive electrode active material is 1.5-2.2 wt%; the volume average particle size of the positive electrode active material is 7-9 [mu] m. According to the positive electrode active material disclosed by the invention, through the cooperation of the coating shell layer, the embedded Fe2P nano second phase and the glass phase neck bridge, the comprehensive performance of a full-tab battery cell and an electric device can be effectively improved.

A particulate nanocomposite material comprising, as determined by X-ray diffraction (XRD): elemental carbon (C); elemental nickel (Ni) in a cubic crystalline phase; a cubic nickel oxide (NiO) crystalline phase; an orthorhombic calcium borate (CaB2O4) crystalline phase; and, a magnesium borate (MgB2O4) crystalline phase. The particulate nanocomposite material is characterized in that, based on the total number of atoms in the nanocomposite material: the atomic concentration of carbon is from about 1 atomic percent (at. %) to about 10 at. %; the atomic concentration of nickel is from about 1 at. % to about 10 at. %; the atomic concentration of boron (B) is from about 1 at. % to about 10 at. %; the atomic concentration of magnesium (Mg) is from about 5 at. % to about 15 at. %; and, the atomic concentration of calcium (Ca) is from about 1 at. % to about 10 at. %.