171results about "Graphite" patented technology

An anode material and a battery provided. The anode material includes artificial graphite, and there are pores inside and / or on surface of the artificial graphite. The anode material has an oil absorption value of O mL / 100g, a pore volume of V cm3 / kg, and a specific surface area of S m2 / g, where 400 ≤ O*V*S ≤ 1500. The anode material improves adsorption and infiltration performance of the anode material to electrolyte, and enhance high rate charge-discharge performance of the anode material, without affecting processing performance.

This invention discloses a transition metal sulfide intercalated graphite, its preparation method, and its applications, belonging to the field of materials science and technology. Utilizing the characteristics of a two-chamber system, a synthesis strategy based on temperature and time differences is adopted. Pretreated transition metal chlorides are uniformly mixed with flake graphite and then subjected to heat treatment. By introducing low-melting-point nitrates, the mechanical energy from ball milling is converted into internal energy, allowing the reaction system to reach the eutectic temperature and initially activating the flake graphite, significantly shortening the reaction time. Simultaneously, sublimed sulfur is used as a sulfur source for sulfidation treatment, synthesizing transition metal sulfide intercalated graphite in one step. Unlike traditional methods that first synthesize transition metal chloride intercalated graphite and then perform secondary processing to obtain transition metal sulfide intercalated graphite, the transition metal sulfide intercalated graphite obtained by this invention has advantages such as low cost, simple process, convenient preparation, high reproducibility, no impurity phases in the product, and high sulfidation rate, making it directly applicable to the field of electromagnetic wave absorption.

A graphite purification system contains a vessel adapted to contain graphite particles, including an inductive coil for heating said vessel; and a cooling system for cooling said graphite purification system, whereby the cooling system is adapted to also cool the graphite particles. The purification system may be a continuous or batch system, and, the vessel may be at least partially formed from graphite. A process for purifying graphite particles is also presented and includes providing a vessel formed at least partially from graphite; loading graphite particles into the vessel; inductively heating at least a portion of the vessel, and thereby heating the graphite particles in physical contact with the vessel; and cooling the vessel and the graphite particles.

This invention discloses a microwave preparation method for sulfur-free expanded graphite and its application, belonging to the field of carbon material preparation technology. The method includes four steps: raw material pretreatment, sulfur-free intercalation treatment, microwave expansion treatment, and post-treatment. This invention selects high-carbon natural flake graphite, which is pretreated by crushing and drying. Then, an intercalation reaction is carried out by adding a sulfur-free oxidant and a composite intercalation solution. Following microwave heating for rapid expansion, the finished sulfur-free expanded graphite is obtained after post-treatment. This invention innovatively adopts a sulfur-free intercalation system, completely eliminating sulfur residue and pollution. Combined with microwave heating technology, energy consumption is reduced by more than 60% compared to traditional processes. The process is simple and the production cycle is short. The obtained product has an expansion volume ≥300mL / g, a sulfur content ≤0.01%, high purity, and stable performance. It can be widely used in multiple fields, solving the problems of sulfur pollution, high energy consumption, complex processes, and limited applications of existing technologies, and has significant economic and environmental benefits.

This invention discloses a method for reusing negative electrode graphite from waste lithium batteries, comprising the following steps: stripping graphite from the current collector to obtain waste graphite; mixing and grinding the waste graphite, sublimed sulfur, and red phosphorus to obtain a mixed powder; placing the mixed powder in an inert gas atmosphere and rapidly burning it in a rapid-burning device for a period of time, followed by cooling, to obtain recycled graphite. The invention also discloses the preparation and application of this recycled graphite. This invention is applicable to the field of lithium battery recycling technology. Rapid burning effectively removes impurity elements from the negative electrode graphite in waste lithium batteries, helping to reduce the negative impact of these impurities on the performance of the negative electrode graphite; subsequently, through the grinding reaction with sublimed sulfur and red phosphorus, C-S-P bonds are formed, improving the conductivity and rate performance of the graphite, thereby enhancing the capacity and cycle performance of the obtained recycled graphite.

The present invention provides for a process for synthesis of carbon beads comprising sub-micron size, micron size or milli size. The process enables modulation of the viscous slurry for synthesis of the carbon beads with improved physico-chemical properties. The process enhances ability of the carbon beads to withstand extreme pH and high temperatures. The present invention also provides a composition for synthesis of the carbon beads. The present invention also provides a microfluidic droplet generator for synthesizing the carbon beads. The carbon beads synthesized by the present invention are applicable in separation, filtration, purification, wires and cables, electrodes, sensor, composite and additive manufacturing, pharmaceutical delivery applications.

The invention discloses a temperature control method for processing graphite by using double plasma sources, and relates to the technical field of plasma material processing, in particular to a temperature control method for processing graphite by using double plasma sources, which comprises the following steps: adopting a cylindrical reactor, and arranging a plasma source I and a plasma source II up and down along the axial direction on two sides of the cylindrical reactor, and an outlet of the powder feeding mechanism directly faces a core high-temperature area of the plasma source I, so that graphite powder directly enters a heating area. The two sources are connected in series up and down to construct a continuous relay type high-temperature path. The center distance between the powder feeding port and the source I is limited not to exceed half of the outlet diameter of the reactor, the center distance between the two sources is 1-2.5 times of the outlet diameter, and the center distance between the source II and the outlet is larger than 5 times of the diameter; the flow of the second source is 1.2-1.8 times that of the first source, the temperature of the core area is maintained to be 8000-10000 K by adjusting the flow ratio, and the total power does not exceed 100 kilowatts. The total retention time of the graphite powder in a two-source high-temperature area is longer than 0.2 second, the diameter of an outlet of the reactor is 100-400 mm, the reactor is made of high-temperature-resistant stainless steel or graphite, and accurate control over the graphite treatment temperature is achieved.

This invention relates to the field of battery material preparation technology, and particularly to a high-capacity ultra-fast charging graphite composite anode material, its preparation method, and its application. The graphite composite anode material comprises, from the inside out: a graphite core, a hierarchical porous hard carbon layer, and graphene quantum dots; the graphene quantum dots are distributed within the pores and on the surface of the hierarchical porous hard carbon layer. Through a carefully designed gradient structure, this invention significantly improves the reversible capacity and cycle stability of the material while ensuring high initial coulombic efficiency.

The present invention describes a method for surface modification of carbonaceous particles, the method comprising: a step of agglomerating the carbonaceous particles by mixing them with a non-carbonized bio-based binder; a step of heating the carbonaceous particle aggregate to a temperature T at a rate of at least 25°C / min; and a step of carbonizing the carbonaceous particle aggregate at the temperature T in a gaseous environment containing hydrocarbon gas. The present invention also describes a graphite anode material.

The invention pertains to a process for recovering materials from a stream comprising black mass solids obtained from lithium-ion batteries, the process comprising: i) providing a stream comprising the black mass solids, lithium, cobalt, aluminum, manganese, nickel, iron, copper; ii) leaching the stream with an acid to form a pregnant leach solution and residual solids; iii) separating the pregnant leach solution from the residual solids; iv) isolating a copper product from the pregnant leach solution; v) isolating an aluminum (Al) and / or iron (Fe) product from the pregnant leach solution; vi) isolating a manganese (Mn) product from the pregnant leach solution; vii) isolating a cobalt (Co) product from the pregnant leach solution; viii) isolating a nickel (Ni) product from the pregnant leach solution; ix) isolating a salt by-product from the pregnant leach solution; and x) isolating a lithium product from the pregnant leach solution.

This invention relates to the field of battery materials technology and discloses a high-capacity graphite anode material and its preparation method. The preparation method includes the following steps: raw material selection and pretreatment, exfoliation and activation treatment, elemental doping modification, in-situ polymerization coating, carbonization treatment, crushing and sieving. By crushing, classifying and pretreating the waste graphite raw material with two-step acid washing (hydrochloric acid to remove metals and hydrofluoric acid to remove silicon), impurities in the raw material are removed, providing a high-purity graphite base for subsequent modification. Combined with liquid-phase exfoliation and high-pressure homogenization treatment, the number of graphite layers is reduced and the specific surface area is increased. At the same time, low-temperature plasma activation introduces active sites on its surface, enhancing the chemical reactivity of graphite. This lays a solid structural foundation for subsequent elemental doping and polymerization coating, thereby ensuring the stability and excellent performance of the final material.

The application belongs to the technical field of lithium ion battery negative electrode materials, and particularly relates to a MXene two-dimensional material, a graphite negative electrode material and a preparation method of the MXene two-dimensional material, the preparation method of the MXene two-dimensional material being as follows: lithium sulfate solution is added into a MXene dispersion liquid, stirred uniformly, vacuum dried, calcined at 300-500 DEG C, and the MXene two-dimensional material is obtained; and the application can effectively improve lithium ion conductivity and improve the performance of a battery.

The present application relates to the technical field of lithium ion battery resource recycling and high value utilization, specifically relates to the process of generating, recycling or refining metal by electrolysis method, and discloses a method for synthesizing manganese ferrite magnetic material from waste manganese iron phosphate lithium positive electrode material: first, waste manganese iron phosphate lithium positive electrode powder is mixed with organic binder and solvent to form slurry, and then the slurry is coated on the surface of titanium mesh to obtain a positive electrode sheet; a blank titanium mesh is used as a negative electrode, and NaOH aqueous solution is used as an electrolyte to construct an electrolytic cell, and Li and P elements are leached by electrolysis; the electrolyte is concentrated, supplemented with phosphorus source, and adjusted in pH to recover lithium phosphate; the manganese iron / graphite remaining on the titanium mesh is separated by ultrasonic, and then acidized and dissolved; the graphite is removed by filtration; the filtrate is gelled with citric acid; and the manganese ferrite magnetic material is obtained by subsequent calcination. The method realizes efficient leaching of Li and P through electrochemical treatment, and simultaneously converts Mn and Fe into high-crystallinity manganese ferrite, which has the advantages of green low consumption and full-element closed-loop recycling.

A multilayer electronic component includes a body including a dielectric layer and an internal electrode alternately disposed with the dielectric layer; and an external electrode disposed on the body, wherein the internal electrode includes at least one selected from the group consisting of a MAX material and a Silicide material, and an auxiliary layer may be disposed at an interface between the internal electrode and the dielectric layer.

The present invention relates to a negative electrode active material for lithium secondary batteries and a method for producing the same, wherein the negative electrode active material for lithium secondary batteries contains natural graphite and satisfies the following formula 1. <Expression 1> 2.23 ≤ [D90] / [D10] ≤ 2.37 (In formula 1 above, [D10] and [D90] represent particle sizes corresponding to 10% and 90% of the cumulative volume of the negative electrode active material, measured using the laser diffraction method.)

This invention belongs to the field of graphene material preparation technology, specifically relating to a method for in-situ synthesis of graphene via molten salt electrolysis. Specifically, it uses molybdenum metal as the anode, porous graphite as the cathode, and high-alumina ceramic as the diaphragm. The molten salt electrolyte system includes metal chlorides and alkali metal oxides, and electrolysis is performed at a constant voltage under an inert gas protective atmosphere. Utilizing the synergistic effect of the electrochemical intercalation of molten salt cations and the catalytic activation of graphite edges by oxygen ions provided by the oxides, the graphite surface layer is controllably and directionally exfoliated, transforming in-situ into few-layer graphene. The entire process is carried out under the protection of the porous ceramic diaphragm, effectively blocking interference from anode byproducts. This invention has significant advantages such as simple process, environmental friendliness, controllable product quality, and ease of large-scale production.

The application discloses a kind of based on microorganism purification and structural reconfiguration's microcrystalline graphite porous carbon material preparation method, it is related to sodium ion battery negative material field.The present application comprises the following steps: using microbial inoculum to the microcrystalline graphite of treated is immersed and purified;Through catalyst to the microcrystalline graphite of immersion and purification after immersion;After impregnation, the material is placed under high temperature, inert gas and is heat treated;After heat treatment, after cooling to room temperature, post-processing is carried out;The present application utilizes the silicate, iron compound and other impurities in microcrystalline graphite of microbial metabolite selective dissolution, avoids the use of strong acid and strong base, and is environmentally friendly;At the same time, through catalyst selection and process parameter control, the size and interlayer spacing of graphite-like microcrystal are accurately controlled at relatively low temperature, and the obtained porous carbon material has high initial coulomb efficiency, excellent rate performance and cycle stability, and is suitable for sodium ion battery negative.

A graphitic carbon material for a negative electrode of a lithium ion secondary battery, in which a crystallite size Lc (002) determined by X-ray diffraction is from 35 nm to 150 nm, and a tap density is 0.90 g / cm3 or more.

Non-graphitizable carbon, a negative electrode for a lithium-ion secondary battery, and a lithium-ion secondary battery are disclosed. In the non-graphitizable carbon, a strain ε determined by a method in which an X-ray diffraction pattern is subjected to Rietveld analysis to obtain a profile and the profile is used to determine a strain ε by a Williamson-Hall method is 0.081 to 0.120, and a lattice plane distance d002 corresponding to 002 reflection as obtained by subjecting the X-ray diffraction pattern to Rietveld analysis is 0.360 to 0.370 nm.

A device for rounding a graphite material by impact action, comprising a process chamber, a feed device for supplying graphite material into the process chamber, and a plurality of rounding tools, which are preferably arranged on the outer circumference of a rotor rotating about an axis of rotation and in one direction of rotation, preferably in the form of a disk, which is located in the process chamber, wherein the rounding tools are designed such that they can act on graphite particles during operation in such a way that these are rounded by folding, and a separating device for separating fine material and ultrafine material as well as a product outlet, wherein the process chamber is equipped with a coolant feed device through which free coolant medium can be introduced into the process chamber, wherein the device preferably also includes a control for the process chamber temperature.

This invention provides a high-pH heat treatment device for spherical graphite, belonging to the field of spherical graphite preparation technology. It includes a treatment tank for heat treating spherical graphite. The top and bottom of the treatment tank are fixedly connected to connecting pipes, and the other end of the connecting pipes is fixedly connected to a transfer tank. The upper and lower ends of the treatment tank are fixedly connected to sealing components for opening and closing the connecting pipes. Both ends of the inner side of the treatment tank are fixedly connected to side seats, and the other end of the side seats is slidably connected to an outer frame. By setting up connecting pipes, a transfer tank, and sealing components, this invention allows the device to open and close the connecting pipes by driving a partition with a cylinder. The transfer tank facilitates the addition and unloading of graphite, increasing the transfer space and eliminating the need for direct loading and unloading inside the treatment tank. This ensures the airtightness of the treatment tank, preventing heat and inert gas leakage and improving the practicality of the device.

There is provided carbonaceous substance-coated graphite particles that are excellent in all of output characteristic, fast charging characteristic, and cycle characteristic when used as a negative electrode material for a lithium ion secondary battery. The carbonaceous substance-coated graphite particles include graphite particles and a carbonaceous substance covering at least part of surfaces of the graphite particles. A mass reduction starting temperature when the carbonaceous substance-coated graphite particles are heated in a water vapor atmosphere is 800°C to 980°C, and a content of the carbonaceous substance is 0.1 to 15.0 parts by mass with respect to 100.0 parts by mass of the graphite particles.

This invention provides a silicon-carbon composite material based on steam explosion, its preparation method, and its application, belonging to the field of silicon-carbon composite material technology. The preparation method includes the steps of preparing a precursor composite slurry, steam explosion, and simultaneous carbonization and activation. The steam explosion treatment step involves pumping the precursor composite slurry into a steam explosion reactor, introducing saturated steam, and maintaining pressure at 200-280℃ and 2.0-4.5MPa for 30-40 minutes. During the pressure maintenance, ultrasonic assistance is activated. After the pressure maintenance, a step-by-step depressurization is performed, i.e., 3-8 depressurizations are completed within 6-10 seconds, with each depressurization pressure being 10-30% of the previous one. After each depressurization, the pressure is held momentarily for 0.1-0.2 seconds, and finally completely depressurized to atmospheric pressure. After drying, the exploded product is obtained. The silicon-carbon composite material obtained by the method of this invention exhibits excellent cycle performance and rate performance when applied to batteries.

The application discloses a kind of plasma powder conveying structures for graphite spheroidization, it relates to plasma powder processing technical field, specifically a kind of plasma powder conveying structures for graphite spheroidization, the structure by limiting the distance L of powder feeding mechanism intrusion plasma 3 Less than 1 / 2 of plasma diameter D 4, ensure that graphite powder is fully contacted high-temperature core area, spheroidization rate is promoted to more than 90%; The inner diameter D of powder feeding mechanism 2 It is 100~1000 times of graphite powder particle size D 0, avoid conveying blockage;Cooling hole diameter D 3 Greater than 0.1 D 2, interval L 2 With power increase and decrease (2~10mm), included angle S 1, S 2 With working medium gas enthalpy adjustment (10~30 °), realize efficient cooling and equipment protection.The application solves the problem of low spheroidization rate, easy to block and equipment overheating, significantly improves processing efficiency and equipment life, suitable for industrial production.