1280results about "Cobalt compounds" patented technology

In order to solve the problems that an existing positive electrode material is unstable in structure and low in energy density, the invention provides a positive electrode material and a preparation method thereof, a positive electrode plate and a battery, the positive electrode material comprises lithium cobalt oxide of a layered structure, the chemical formula of the lithium cobalt oxide is Li < 1-alpha-beta > Na < alpha > (Mg < gamma > Ti < delta > Co < 1-gamma-delta >) O2, alpha is smaller than or equal to 0.005, and beta is 0.02-0.05; gamma is equal to 0.002 to 0.004, delta is equal to 0.001 to 0.003, and gamma + delta is equal to 0.003 to 0.006.

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 discloses a high-performance sodium ion battery negative electrode ZnS / CoS (at) C composite material and a preparation method thereof, the material preparation method has the characteristics of definite control parameter, easy purity control, simple operation, good process repeatability and the like, and the prepared sodium ion secondary battery negative electrode material has excellent sodium ion intercalation and deintercalation capability and can be used for preparing a sodium ion secondary battery negative electrode material. The specific capacity, the cycling stability, the coulombic efficiency and the rate capability of the sodium ion secondary battery can be effectively improved, the requirements of different conditions can be met, and the application prospect is wide.

A raw material solution containing trivalent iron ions, or trivalent iron ions and ions of a metal element that partially substitutes Fe sites, and an alkaline aqueous solution for neutralizing the raw material solution are added to a reaction system to adjust the pH of the reaction system from 1.0 to 3.0 or lower. Hydroxycarboxylic acid is added to the obtained reaction solution and the pH of the reaction system is then neutralized from 7.0 to 10.0 or lower. The obtained precipitate of a substituent metal element-containing iron oxyhydroxide is coated with silicon oxide, followed by heating so as to form particles of ε-iron oxide in which Fe sites are partially substituted by other metal elements, and then, a slurry containing the particles is classified. The iron-based oxide magnetic powder has a particle shape close to a perfect sphere and is suitable for use in a magnetic recording medium.

The invention relates to the technical field of batteries, in particular to a composite positive electrode material, a preparation method thereof and a battery. The composite positive electrode material comprises a positive electrode substrate, a fast ion conductor layer and a halide layer, the positive electrode substrate comprises a doped lithium cobalt oxide material; the fast ion conductor layer is positioned on the surface of the positive electrode substrate and comprises an oxide of a metal element Q with a spinel phase; the halide layer is located on the surface of the fast ion conductor layer and comprises element lithium, metal element M and halogen X. Through coordination and cooperation of the matrix material, the fast ion conductor layer and the halide layer, the structural stability and the surface morphology of the material can be effectively improved, the defects of the material are overcome, and the composite positive electrode material has excellent conductivity and has excellent cycling stability and rate capability at high temperature and / or high voltage, so that the battery has high safety performance.

The present invention generally relates to a field of material science and chemistry. Specifically, the present invention relates to synthesis and characterization of lead-free hybrid organic-inorganic Perovskite compounds for metal ion sensing applications. More particularly, the present invention relates to lead-free low dimensional manganese (Mn)- and copper (Cu)- based hybrid organic-inorganic perovskites (HOIPs) for visual fluorometric Pb2+ ion detection. Further, the present invention relates to synthesis of lead-free low dimensional manganese (Mn)- and copper (Cu)-based hybrid organic-inorganic perovskites (HOIPs) via mechanochemical synthesis methodology.

The invention discloses cobalt molybdenum nitride / cobalt modified nitrogen-doped hollow carbon microspheres as well as preparation and application thereof, and relates to the technical field of electrochemical energy storage devices. Carboxylated polystyrene microspheres, soluble zinc salt and cobalt salt, phosphomolybdic acid and 2-methylimidazole are dispersed in methanol, a PMA (at) ZnCo-ZIFs / PS precursor of a spherical structure is obtained, then the PMA (at) ZnCo-ZIFs / PS precursor is placed in an inert atmosphere for carbonization treatment, and the cobalt molybdenum nitride / cobalt modified nitrogen-doped hollow carbon microsphere material is obtained. According to the structure and the preparation method, the nitride / metal cobalt component and the nitrogen-doped sodium affinity sites are introduced at the same time, uniform transportation and nucleation of sodium ions are effectively induced, sodium metal is guided to deposit in a specific three-dimensional structure, growth of sodium dendrites is effectively inhibited, volume expansion of metal sodium in the reaction process is relieved, the preparation method is simple and convenient, and the preparation method is suitable for industrial production. The cost is low, the electrochemical performance of the sodium metal battery assembled by using the composite material can be remarkably improved, and the composite material has a good large-scale application prospect.

This invention relates to an in-situ detection system for a rotating microliquid film reactor (MFR) for monitoring the nucleation behavior of nanomaterials. The reactor comprises a rotor and a stator, with a stator base angle of 70-85°, a rotational speed of 500-5000 rpm, and a slit width of 10-500 μm to ensure that fluid passing through the slit does not undergo backmixing and to create a strong shear field. A micro-negative pressure sampler is fabricated to capture nucleating particles within the high-speed shear field and bring them into the visible observation area. A high-speed camera and microscope objective are connected in situ, thereby acquiring instantaneous images of the nucleation process at the nanoscale and capturing the transient evolution behavior of crystal nuclei. The construction of this rotating MFR in-situ detection system solves the problems of poor micro-mixing effects and uncontrollable nucleation and growth in traditional stirred tank reactors, leading to poor quality in large-scale preparations, and the inability to observe phase transitions and instantaneous nucleation processes in a closed reactor. The obtained hydrotalcite nucleation results enrich non-classical nucleation theories and provide guidance for the large-scale preparation of nanomaterials.

The invention relates to the technical field of lithium ion batteries, in particular to a high-voltage lithium cobalt oxide positive electrode material and a preparation method thereof. According to the technical scheme, the chemical composition of the positive electrode material is at least two elements selected from Al, Mg, Ti and Zr. Through triple strategies of multi-element synergistic doping, core-shell structure design and surface defect regulation and control, breakthrough improvement of the performance of the high-voltage lithium cobalt oxide positive electrode material is achieved, and especially through the synergistic effect of a specific element combination Al + Mg + Ti and the coupling effect of the gradient-distributed F element and the nanometer defect structure, the performance of the high-voltage lithium cobalt oxide positive electrode material is improved. The structure phase change and the interface side reaction in the high-pressure circulation process are effectively inhibited, and the cycle life and the thermal stability of the material are remarkably improved.

The invention discloses a method for regenerating and preparing high-voltage lithium cobalt oxide by using an invalid lithium cobalt oxide material, and belongs to the technical field of battery recovery. The method comprises the following steps: S1, carrying out ball milling and mixing on failed lithium cobalt oxide powder and a sodium source, and then carrying out solid-phase sintering to obtain a P2 type sodium cobalt oxide and lithium cobalt oxide material; s2, the P2 type sodium cobaltate and lithium cobaltate material is placed in a lithium-containing solution for a hydrothermal reaction, a regenerated O2-O3 cotype lithium cobaltate material is obtained, the regenerated O2-O3 cotype lithium cobaltate material has the advantages of being good in cycling stability, high in rate capability, high in low-temperature performance and the like under the high voltage of 4.6 V, and the performance of the regenerated O2-O3 cotype lithium cobaltate material is superior to that of a commercial lithium cobaltate material.

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 provides a method for strengthening recovery of a waste lithium iron phosphate material by using waste lithium cobalt oxide as an oxidizing agent. The method comprises the following steps: discharging and disassembling waste lithium iron phosphate and lithium cobalt oxide batteries to obtain positive plates; dissolving aluminum foil in the positive plate in a sodium hydroxide alkaline leaching solution to obtain lithium iron phosphate and lithium cobalt oxide positive electrode powder; the method comprises the following steps: leaching lithium iron phosphate positive electrode powder by adopting a deep-eutectic solvent, and meanwhile, realizing an enhanced leaching process by taking lithium cobalt oxide positive electrode powder as an oxidizing agent; and carrying out coordination separation and photo-reduction separation on the completely leached solution to realize selective recovery of cobalt, iron, phosphorus and lithium. According to the method, the oxidation-reduction capacity of the material is fully utilized to strengthen the leaching process, efficient recovery of valuable elements in the waste positive electrode material is achieved, and additional addition of an oxidizing agent and a reducing agent is avoided. The method can achieve the purposes of synergistic enhanced leaching and selective separation of the waste lithium cobalt oxide material and the waste lithium iron phosphate material, and is low in cost, high in recovery rate and wide in industrial application prospect.

The invention provides a coated modified lithium cobalt oxide material, a preparation method thereof, a positive electrode and a lithium ion battery. The preparation method comprises the following steps: providing a mixture, wherein the mixture sequentially comprises first lithium cobalt oxide particles, a coating agent and second lithium cobalt oxide particles from bottom to top; sequentially carrying out first mixing, second mixing and third mixing on the mixture; and sintering to obtain the coated modified lithium cobalt oxide material. The D50 particle size of the first lithium cobalt oxide particles is larger than that of the second lithium cobalt oxide particles; the mixing rotating speeds of the first mixing, the second mixing and the third mixing are sequentially increased. In the lithium cobalt oxide coating modification process, the positions of the first lithium cobalt oxide particles, the second lithium cobalt oxide particles and the coating agent in the mixture in the vertical direction are designed to form a sandwich structure, and a three-stage mixing process is combined, so that the mixing uniformity of the coating agent and the lithium cobalt oxide material is remarkably improved, and the coating performance of the lithium cobalt oxide material is improved. And uniform coating of the coating element on the surface of the lithium cobalt oxide material is realized.

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 lithium batteries, and particularly relates to a lithium cobalt oxide positive electrode material and a preparation method and application thereof. When the D50 particle size of the lithium cobalt oxide positive electrode material is 10-20 microns, the specific surface area of the lithium cobalt oxide positive electrode material is 0.4-0.8 m < 2 > / g; the real density of the lithium cobalt oxide positive electrode material is 4.85-5.03 g / cm < 3 >, and the tap density is 2.35-2.50 g / cm < 3 >; the lithium cobalt oxide positive electrode material has an R3-m space group structure, and the peak intensity ratio I (003) / I (104) of a 003 peak to a 104 peak in an XRD spectrogram of the lithium cobalt oxide positive electrode material is greater than or equal to 2.5. The method is characterized in that inert gas is introduced into a Li-Na hydrothermal replacement system to form aerosol, and Li-Na exchange is carried out under the protection of the aerosol, so that the D50 particle size, the specific surface area, the true density, the tap density and the I (003) / I (104) of XRD of the lithium cobalt oxide positive electrode material are in specific parameter ranges; the obtained lithium cobalt oxide positive electrode material has excellent lithium de-intercalation dynamic performance, so that a lithium ion battery is endowed with excellent capacity performance and rate capability.

The invention relates to the technical field of lithium ion batteries, in particular to a positive electrode material and a preparation method thereof, a positive plate and a lithium ion battery. The positive electrode material comprises a lithium cobalt oxide matrix material and a nickel cobalt lithium manganate coating layer coating the surface of the lithium cobalt oxide matrix material; the crystalline phase of the lithium cobalt oxide matrix material is an O3 phase; the crystalline phase of the nickel cobalt lithium manganate coating layer is a composite phase of O2 and T2; the chemical formula of the nickel cobalt lithium manganate coating layer is LikNajNiaCobMncO2 + d, wherein k is more than or equal to 0.60 and less than or equal to 1.05, j is more than or equal to 0 and less than or equal to 0.02, a is more than or equal to 0.01 and less than or equal to 0.6, b is more than or equal to 0.02 and less than or equal to 0.97, c is more than or equal to 0.02 and less than or equal to 0.6, 1-a-b-c is more than or equal to 0 and less than or equal to 0.05, and d is more than or equal to-0.05 and less than The positive electrode material is high in capacity under high voltage and excellent in cycle performance.

The invention belongs to the technical field of air power supplies, and relates to modification treatment of an oxide, in particular to a cerium oxide doped transition metal oxide and a preparation method thereof, an air cathode and an air power supply. The preparation method comprises the following steps: dissolving cerium salt, cobalt salt and manganese salt in water, uniformly mixing to obtain a mixed solution, adjusting the pH value of the mixed solution to 9-11, and carrying out a sedimentation reaction to obtain a sediment; and drying the precipitate, and calcining in an air atmosphere at 300 + / -10 DEG C for 2-4 hours to obtain the cerium oxide doped transition metal oxide. The cerium oxide doped transition metal oxide is cerium doped cobalt manganese oxide with a spinel structure, and the doping amount of cerium is 20 + / -1wt%. The cerium oxide doped transition metal oxide provided by the invention is applied to an air cathode as a catalyst, and has good stability and high catalytic activity. The performance of an air power supply containing the oxide is remarkably improved. The method for preparing the oxide provided by the invention is simple and easy to operate, and is suitable for large-scale production.

The invention relates to the technical field of lithium ion batteries, and particularly discloses an antimony chalcogenide coated lithium cobalt oxide positive electrode material and a preparation method and application thereof.The preparation method comprises the steps that lithium cobalt oxide powder is mixed with an antimony-containing compound, a sulfur-containing compound and a selenium-containing compound in deionized water, and a uniformly-dispersed precursor solution is formed; the molar ratio of the lithium cobalt oxide powder to the compound containing antimony, sulfur and selenium is 1: (0.01-1): (0.01-3): (0.001-2); drying the precursor solution to obtain solid powder; and calcining the solid powder at 100-500 DEG C in a protective atmosphere to finally obtain the antimony chalcogenide coated lithium cobalt oxide positive electrode material. According to the preparation method of the antimony chalcogenide-coated lithium cobalt oxide positive electrode material, the prepared antimony chalcogenide-coated lithium cobalt oxide positive electrode material has good structural stability, and when the antimony chalcogenide-coated lithium cobalt oxide positive electrode material is used in a lithium ion battery, the specific capacity of the lithium cobalt oxide battery under high voltage can be remarkably improved, and the cycle life of the lithium cobalt oxide battery under high voltage can be remarkably prolonged.

The invention discloses an OER electrocatalyst as well as a preparation method and application thereof, and belongs to the technical field of electrolyzed water. The OER electrocatalyst is a Ni (OH) 2-CoWO4 / Co3W3C-coated CNF heterojunction composite material with a 3D (three-dimensional) structure. According to the preparation method, a CNF nano array is taken as a substrate, and the Ni (OH) 2-CoWO4 / Co3W3C-coated CNF multilevel heterostructure composite material is prepared through in-situ growth of CoWO4 / Co3W3C and in combination with water bath etching treatment. The in-situ constructed heterostructure catalyst not only improves the stability of the material structure, but also effectively improves the catalytic performance of OER. The preparation technology is simple, large-scale implementation is easy, and the method is suitable for preparing the high-performance OER anode material in batches.

The present invention discloses a preparation method of CFS nanozyme. This nanozyme has broad-spectrum bactericidal property, has low toxicity to normal cells, and there is no problem of bacterial drug resistance, and is expected to be used in the field of antibiotic-free sterilization. The CFS-ion-MN wound repair microneedle patch provided by the present invention, as a wound dressing, can transdermally deliver the antibacterial CFS nanozyme to the deep part of the wound, effectively kill bacteria. The CFS nanozyme can also inhibit inflammation in the body through its superoxide dismutase-like activity, promote wound healing, and promote the antibacterial and healing of the wounds of mice infected with Staphylococcus aureus. Among them, Co 2+ and Fe 3+ can inhibit the IL-17 and NF-κB signaling pathways, thereby accelerating wound closure.

The present invention relates to the field of lithium battery materials. Specifically, it relates to a lithium-rich manganese-based cathode material, a preparation method thereof, and an application. The surface of the lithium-rich manganese-based cathode material has oxygen vacancies, and its molecular formula is Li 1+a Mn b M c O2, wherein Mn includes trivalent manganese and tetravalent manganese, and the molar percentage of trivalent manganese in the overall Mn is 20% to 60%. M includes one or more of Ni, Co, Al, Mo, Ti, and Zr, 0

The invention relates to the field of negative electrode materials, in particular to a carbon nanotube enhanced negative electrode material and a preparation method thereof. The carbon nanotube enhanced negative electrode material comprises the following substances in parts by weight: an artificial graphite inner core, a carbon nanotube coating layer and an asphalt coating layer which are sequentially coated from inside to outside, and the carbon nanotube coating layer further comprises magnetic modified particles, the asphalt coating layer comprises the following substances in parts by weight: 25-35 parts of biochar particles; 65 to 70 parts of asphalt particles; and 0.1-0.5 part of a dispersant. According to the application, a continuous conductive network can be constructed through the carbon nanotube coating layer, the electron transmission efficiency is improved, and meanwhile, the asphalt coating layer is compounded through the biochar particles and the asphalt. The synergistic effect of the three-layer structure can repair the surface defects of the artificial graphite, reduce the side reaction of the electrolyte and inhibit the volume expansion in the charge-discharge process, so that the cycling stability and conductivity of the negative electrode material are comprehensively improved.

The invention relates to a lithium cobalt oxide positive electrode material and a preparation method and application thereof. According to the method, a matrix and a coating layer located on the surface of the matrix are included, and the matrix and the coating layer form a sandwich composite structure lithium cobalt oxide positive electrode material with a (R-3m) (P63mc + P63 / mmc) (R-3m) space group. According to the scheme provided by the invention, the defects of O3-phase lithium cobalt oxide can be effectively improved, and the lithium cobalt oxide has four-high characteristics of high capacity, high rate, long service life and high safety, and particularly has excellent structural stability and conductivity under high voltage.

To provide a method for producing a positive electrode active material for a lithium secondary battery, the positive electrode active material being capable of imparting excellent high-temperature storage characteristics and reducing impedance, when used as a positive electrode active material of a lithium secondary battery.SOLUTION: A method for producing a positive electrode active material for a lithium secondary battery includes: a first mixing step of mixing a lithium compound, a cobalt compound and an aluminum compound and obtaining a first mixture; a first calcination step of calcining the first mixture and obtaining, as a first calcined product, aluminum-containing lithium cobalt composite oxide particles which are such that aluminum is present in a solid solution at least inside the particles; and a second mixing step of dry mixing the first calcined product obtained in the first calcination step and MgF2 and AlF3 which are inorganic fluoride particles and obtaining, as a second mixture, a positive electrode active material.SELECTED DRAWING: Figure 1

The invention belongs to the technical field of lithium ion batteries, and particularly discloses a composite coated high-voltage lithium cobalt oxide positive electrode material as well as a preparation method and application thereof. The positive electrode material comprises an inner core, and a first coating layer and a second coating layer which sequentially coat the inner core from inside to outside; the inner core is a doped lithium cobalt oxide matrix, the chemical formula is Li1 + xCo1-yM1yM2zO2, x is more than or equal to 0 and less than or equal to 0.1, y is more than or equal to 0.001 and less than or equal to 0.05, z is more than or equal to 0.001 and less than or equal to 0.05, M1 is selected from at least one of Al, Ni and Fe, and M2 is selected from at least one of Mg, Al, Zr, Zn, Ni, Fe, Sr, Mo, Ta and W; the chemical formula of the first coating layer is La1-mNmCoO3-n.Co3O4, m is greater than 0 and less than 1, n is greater than 0 and less than 3, and N is selected from one or two of Ca, Mg, Fe, Zn, Ba and Zr; and the second coating layer is cobalt oxide of YOF and Y. The core problems of bulk phase structure degradation, serious interface side reaction, interface impedance increase and the like under high voltage can be cooperatively solved.

The invention discloses an electromagnetic wave absorbing material CoFe2O4 / ZnO-RGO with a ternary heterostructure as well as a preparation method and application of the electromagnetic wave absorbing material CoFe2O4 / ZnO-RGO, and belongs to the technical field of electromagnetic wave absorption. According to the material, a novel heterostructure with a multi-scale interface and a three-dimensional conductive network is constructed by compounding magnetic loss type CoFe2O4, dielectric loss type ZnO nanorods and resistance loss type RGO. Wherein the ZnO nanorod not only serves as a dielectric loss body, but also effectively enhances the structural anisotropy and the interface polarization effect of the material, and cooperates with the magnetic loss of CoFe2O4 and the resistance loss of RGO to jointly optimize impedance matching and improve the electromagnetic attenuation capability, so that the material shows excellent wave-absorbing performance under various thickness and even ultrathin conditions. The material source is wide, the cost is low, the preparation process is green, simple and convenient, the material is suitable for large-scale production, and an effective material solution is provided for electromagnetic wave absorption application in the national defense and civil fields.

To provide a novel positive electrode active material, a positive electrode, and a lithium ion secondary battery.SOLUTION: A lithium ion secondary battery includes a positive electrode, a negative electrode, and an electrolyte. The positive electrode includes a positive electrode active material including a complex oxide containing lithium and cobalt. The positive electrode active material contains barium, magnesium, and aluminum in a surface layer part. In the analysis of the surface layer part, it is preferable to include a region where a first point at which the concentration of barium is the maximum and a second point at which the concentration of magnesium is the maximum exist on a surface side of the positive electrode active material relative to a third point at which the concentration of aluminum is the maximum.SELECTED DRAWING: Figure 3

The invention discloses a PtTe-Co (OH) 2 core-shell catalyst as well as a preparation method and application thereof, and belongs to the technical field of electrolyzed water catalysts. The morphology of the PtTe-coated Co (OH) 2 core-shell catalyst is in a sea cucumber-like shape, sea cucumber-like PtTe is used as a core, and amorphous Co (OH) 2 is used as a shell. The preparation method comprises the following steps: preparing sea cucumber-like PtTe by adopting a one-step wet chemical reduction method, and covering the surface of the PtTe with an amorphous Co (OH) 2 nano-sheet by adopting an in-situ growth method, so as to prepare the core-shell catalyst. The prepared PtTe-Co (OH) 2 core-shell catalyst has an excellent bifunctional characteristic, can drive an electrolyzed water reaction, and is simple in process, low in cost, safe in process, small in pollution and suitable for large-scale industrial production.

The invention provides a lithium cobalt oxide composite material and a preparation method thereof, a positive plate and a lithium ion battery. The lithium cobalt oxide composite material comprises first lithium cobalt oxide composite particles and second lithium cobalt oxide composite particles; the first lithium cobalt oxide composite particles comprise first lithium cobalt oxide and a lithium-rich positive electrode material coating the surface of the first lithium cobalt oxide; the second lithium cobalt oxide composite particles comprise second lithium cobalt oxide and a lithium-rich positive electrode material coated on the surface of the second lithium cobalt oxide; the D50 particle size of the first lithium cobalt oxide composite particles is larger than that of the second lithium cobalt oxide composite particles. The lithium-rich positive electrode material is arranged on the surface of the lithium cobalt oxide material, so that the first coulombic efficiency, the specific discharge capacity and the energy density of the battery are improved; and the first lithium cobalt oxide composite particles and the second lithium cobalt oxide composite particles with different particle sizes are selected for grading, so that the first charge-discharge capacity and the cycling stability of the material are improved, and the requirements of a high-performance lithium ion battery using a silicon-carbon negative electrode are met.

Embodiments described herein relate to removal and addition of coatings from electrodes. In some aspects a method can include suspending an electrode mixture in a solvent, the electrode material including an electrode material and a coating material, agitating the electrode mixture via at least one of sonication or stirring, such that the coating material separates from the electrode material, and separating the electrode material from the conductive material. In some embodiments, the electrode material can include a binder and the solvent can dissolve the binder. In some embodiments, the electrode mixture is from a first electrode, and the method can further include removing a packaging from a battery and separating the first electrode from a second electrode and a separator. In some embodiments, the method can further include regenerating the active material. In some embodiments, the regenerating can include a heat treatment operation.