10 results about "Anion intercalation" patented technology

The invention relates to the technical field of lithium ion battery material recovery and regeneration, and discloses a preparation method of a regenerated graphite negative electrode material based on molten salt electrochemical repair and the regenerated graphite negative electrode material. The preparation method of the regenerated graphite negative electrode material comprises the following steps: S1, discharging and disassembling: discharging, disassembling, crushing and sorting a waste lithium ion battery to obtain a negative electrode material mixture containing graphite; s2, pretreatment: carrying out pretreatment to obtain pretreated graphite; s3, electrochemical repair of molten salt: taking the pretreated graphite as a cathode, placing the pretreated graphite in a molten salt electrolyte containing CaCl2, taking an inert electrode as an anode, applying a voltage lower than the potential of anion intercalation of graphite in the molten salt system to the cathode, and carrying out constant-voltage electrolysis; and S4, post-treatment: after electrolysis is completed, washing and drying to obtain the regenerated graphite negative electrode material. The prepared regenerated graphite negative electrode material is low in metal impurity content, and the first coulombic efficiency and the like are improved.

The invention relates to the technical field of hydrogen production process electrode preparation, in particular to an anode electrode with a multi-stage ordered structure and a preparation method and application of the anode electrode. According to the method, an anode electrode of a multi-stage ordered structure is constructed based on cooperation of a thermal spraying method and a chemical corrosion method. The method comprises the following steps: firstly, preparing metal powder with a porous hollow sphere structure by adopting a hydrothermal process in combination with a calcining process; then preparing a porous metal coating on the surface of the electrode substrate through a thermal spraying process; the preparation method comprises the following steps: preparing a porous metal layer on the surface of an electrode, uniformly introducing a corrosive liquid containing Fe < 3 + > (cations), anions and HCl into the surface of the coating by adopting a solution coating mode, and finally placing the electrode in a saturated steam environment for controllable heating treatment, thereby epitaxially growing the anion intercalation modified ferronickel-based layered hydroxide on the surface of the porous metal layer. And finally obtaining the anode electrode with the multi-stage ordered structure.

The invention belongs to the technical field of batteries, and particularly discloses a wide-voltage composite positive electrode material and a preparation method thereof, a positive electrode plate, a battery and an electric device. The positive electrode material comprises an inner core and a coating layer, the inner core comprises a lithium-containing metal oxide allowing reversible intercalation / deintercalation of lithium ions, the material of the coating layer is selected from a carbon material allowing reversible intercalation of anions and / or a non-carbon two-dimensional layered material, and the coating layer has a specific surface area of 600-1000 m < 2 > / g and a conductivity of 1-50 S / m. According to the invention, lithium ion deintercalation energy storage is preferentially carried out in a low-voltage interval, and an anion deintercalation storage mechanism is started in a high-voltage interval, so that collaborative optimization of energy density and voltage characteristics is realized; the device has the characteristics of high capacity, high voltage platform, stable energy storage, safety and the like.

The invention belongs to the field of batteries, and particularly discloses an expanded graphite positive electrode material as well as a preparation method and application thereof. The preparation raw materials of the expanded graphite positive electrode material comprise a graphite source, an acidic oxidant, a metal salt and / or a hydrate thereof; the mass volume ratio of the graphite source to the acidic oxidant is 1g: (7-25) mL; the mass ratio of the graphite source to the metal salt and / or the hydrate thereof is 1: (0.7-3). The expanded graphite positive electrode material disclosed by the invention has the advantages that the graphite interlayer spacing is increased, more anion sites are provided, the anion intercalation resistance is reduced, and the volume change of graphite during intercalation is small, so that the specific capacity, the rate and the cycle performance of a dual-ion battery are improved; and due to larger interlayer spacing, the stripping of the graphite sheet layer in the reaction process is greatly reduced, and the cycling stability of the expanded graphite positive electrode material is improved.

The present invention discloses a modified ferric oxyhydroxide / sulfide hierarchical oxygen evolution electrode resistant to chlorine corrosion, and its preparation method and application. The present invention uses a pretreated nickel mesh (NM) as a substrate, directly grows a nickel sulfide (Ni3S2) nanosheet array on the substrate surface by a hydrothermal method, and then in situ grows a modified ferric oxyhydroxide-based (Ta‑FeOOH) catalyst with a nanosheet cluster morphology on the nickel sulfide surface by an etching method, thereby constructing a hierarchical oxygen evolution electrode. The Ta‑FeOOH / Ni3S2 / NM electrode prepared by this method effectively regulates the electronic structure inside the catalyst through multi-level interface design and element doping strategy, thereby improving the oxygen evolution performance of the electrode. At the same time, the composite structure of FeOOH / Ni3S2 induces the reaction of chloride ions Cl by the reasonable introduction of anion intercalation. ‑ The like-charge repulsion reduces the corrosion and oxidation of chloride ions at the oxygen evolution active sites, demonstrating the excellent chloride corrosion resistance of the oxygen evolution electrode and providing strong support for the development of seawater electrolysis technology.

The invention discloses a dual-ion battery positive active material as well as a preparation method and application thereof. The positive electrode active material comprises a carbon matrix with a local microcrystalline structure and monatomic metal dispersed in the carbon matrix. The carbon matrix with the local microcrystalline structure can provide more adsorption or embedding sites for anions, and the pseudocapacitance effect is enhanced. Monoatomic doping can regulate and control local hybrid orbits and charge distribution, so that a local charge polarization center is formed, an anion and cation adsorption potential well is generated, an anion and cation intercalation energy barrier is reduced, and anion and cation intercalation / adsorption capacity and stability are enhanced. The preparation method adopts a simple and low-cost preparation process and is suitable for large-scale production. The dual-ion battery provided by the invention has high energy density and power density, high first charge-discharge efficiency and good cycle stability.

This invention relates to a low-spin Fe 3+ The preparation method of the iron-rich NiFe-LDHs electrocatalyst includes the following steps: (1) dissolving amino acids in an aqueous solution containing triethylamine to obtain solution A; (2) dissolving nickel salt and iron salt in a methanol solution to obtain solution B; (3) dissolving an organic base in a methanol solution to obtain solution C; (4) adding solution A to solution B and mixing to obtain solution D; then adding solution C to solution D to carry out a co-precipitation reaction, and finally centrifuging and vacuum drying to obtain the electrocatalyst. This invention uses amino acid pre-complexation and organic base micro-regulation to achieve an amino acid anion intercalation strategy. By utilizing the strong interaction between amino acids and the metal center of the layer, it not only suppresses the generation of impurity phases under high Fe content, but also expands the interlayer spacing and introduces lattice defects, inducing Fe in NiFe-LDHs. 3+ The spin configuration partially changes.

The invention discloses a magnesium-based dual-ion battery and a preparation method and application thereof.According to the magnesium-based dual-ion battery, a battery configuration with magnesium metal as a negative electrode and a graphite material as a positive electrode is constructed, and a cation intercalation behavior in a traditional magnesium battery is replaced with an anion intercalation mechanism; the collaborative design of the ionic liquid electrolyte and the mixed magnesium salt is specifically adopted, the magnesium deposition interface is effectively regulated and controlled, and the performance obviously superior to that of a traditional magnesium battery is achieved. Through the working mechanism of the dual-ion battery, the advantages of high working voltage of the graphite positive electrode and high capacity of the magnesium metal negative electrode are combined, and the wide electrochemical window of the ionic liquid electrolyte is utilized, so that long-life deposition can be realized under low overpotential; meanwhile, through high-capacity and high-rate intercalation reaction of anions in the graphite positive electrode, the problems of narrow voltage window, flammability and explosiveness, short cycle life, low positive electrode capacity, low positive electrode voltage and the like of the current magnesium ion battery are effectively solved.

The application discloses a method for local ordering of graphite carbon material, a graphite carbon material prepared by the method and application of the material in a dual-ion battery. The method according to the application comprises the following steps: 1) dispersing activated carbon and a Group VIII metal salt in water, stirring for 2-24 hours and mixing uniformly; 2) drying and grinding the mixed solution obtained in the step 1) to obtain a precursor, and then carbonizing the precursor by calcination under an inert atmosphere; and 3) cooling the product obtained in the step 2), washing the product with acid and water to remove residual metal particles, and drying to obtain a graphitized carbon positive electrode material. The preparation method according to the application changes the internal structure of the activated carbon from a completely disordered structure to an ordered-disordered structure by regulating the local microstructure of the activated carbon, and increases the designability of the graphite positive electrode material. The preparation method fully utilizes the ion adsorption mechanism of the channel in the activated carbon, simultaneously increases the anion intercalation capacity of the dual-ion battery in a high voltage region, and significantly improves the energy density.

The invention belongs to the technical field of battery technology, and provides a flame retardant, a priming coat and a preparation method thereof, and a positive plate, the flame retardant is an anion intercalation modified magnesium-aluminum layered double hydroxide; the interlayer spacing of the anion intercalation modified magnesium-aluminum layered double hydroxide is 0.76 to 3.1 nm. According to the flame retardant, magnesium-aluminum layered double hydroxide has a specific intercalation layer spacing through anion intercalation modification, the material layer spacing is increased, a difunctional nano barrier layer with flame retardance and ion conduction is constructed, and a traditional halogen-containing flame retardant is replaced. The flame retardant is prepared into priming coat slurry, coating of the slurry is completed through step drying, and the flame retardant is directionally arranged on the surface of a current collector through three different drying modes to achieve vertical orientation; compared with an ineffective distribution prime coat material in the prior art, the heat shrinkage rate of the prime coat mode is reduced, and the interface flame retardance is reduced.