1441results about "Graphite" patented technology

The invention relates to the field of battery materials, in particular to a preparation method and application of a high-rate silicon-carbon negative electrode material. The preparation method of the high-rate silicon-carbon negative electrode material comprises the steps of silicon powder pretreatment, silicon-carbon powder composite ball milling, phosphoric acid treatment, high-temperature carbonization and the like. The preparation method of the high-magnification silicon-carbon negative electrode material is simple in process and high in success rate, the cycle stability of a negative electrode is effectively improved, the silicon-carbon negative electrode material has the characteristics of low expansion volume and long cycle life, the phenomenon that a surface oxide layer hinders lithium ion diffusion is avoided, and the service life of the silicon-carbon negative electrode material is prolonged. The comprehensive performance requirement of the existing lithium ion battery on the negative electrode material is met, and the application potential is very wide.

The invention relates to a graphite silicon carbon composite negative electrode material, a negative electrode plate and a lithium ion battery, and belongs to the technical field of battery negative electrode materials. The graphite silicon carbon composite negative electrode material comprises a graphite inner core and a composite shell layer, the composite shell layer coats the surface of the inner core, the composite shell layer comprises a continuous carbon layer, the carbon layer is of a porous structure, and the porous structure is filled with nano silicon particles. According to the core-shell structure, through a three-stage synergistic mechanism of graphite inner core conductive supporting, porous carbon layer expansion buffering and nanometer silicon capacity contribution, the cycling stability of the negative electrode material is remarkably improved while the high specific capacity is maintained.

A negative active material, a method of preparing the negative active material, and a rechargeable lithium battery including the negative active material are disclosed. The negative active material may include a crystalline carbon core and a magnesium (Mg)-included coating layer on a surface of the core, wherein the Mg-included coating layer may include MgO and MgxSiOy (1≤x≤2 and 3≤y≤4).

The invention discloses a silicon / graphite / carbon-aluminum oxide composite negative electrode material and a green preparation method thereof, and belongs to the technical field of lithium ion batteries. Aiming at the problems of high volume expansion rate and poor cycling stability of a silicon-based negative electrode and high cost of a traditional process, the invention innovatively provides the following scheme: 1) waste photovoltaic silicon wafer ball-milling liquid and waste graphite are taken as core raw materials, and resource recycling is realized; (2) phenolic resin and chitosan are adopted as double carbon sources, a nitrogen-doped carbon layer (the nitrogen content is 3-5 wt.%) is formed through pH-induced self-assembly, and the conductivity and the Li < + > diffusion rate are synchronously improved; and 3) aluminum nitrate is introduced for pyrolysis to generate 2-5nm aluminum oxide for doping, so that the side reaction of the electrolyte is inhibited, and the volume expansion of silicon is relieved (the expansion rate is less than or equal to 120%). The preparation process comprises the steps of silicon / graphite dispersion, double-carbon-source compounding, ammonia water regulation and control precipitation and gradient calcination. Experiments show that the specific capacity of the optimized material under the current of 0.5 A / g reaches more than 800mAh / g, the 100-time cycle capacity retention ratio is more than 98%, the 1000-time cycle capacity retention ratio is more than 80%, the reversible specific capacity under the multiplying power of 3A / g is more than 550mAh / g, and the raw material cost is reduced by 40%. The invention has the advantages of high capacity, long service life, environmental protection and economy, and provides an innovative solution for the fields of power batteries and energy storage.

The invention discloses a negative electrode material and a preparation method and application thereof. The negative electrode material comprises an inner core and a coating layer coated outside the inner core, the inner core is microcrystalline graphite with a porous structure, the coating layer is a carbonized material and comprises a cross-linking layer and a compact layer, the surface of the microcrystalline graphite is coated with the cross-linking layer, and the surface of the cross-linking layer is coated with the compact layer; wherein the cross-linking layer is formed by carbonizing heavy components in a coating agent on the surface of the microcrystalline graphite, the compact layer is formed by carbonizing weak polar groups in the coating agent, and the graphitization degree of the compact layer is greater than or equal to 94%. The negative electrode material disclosed by the invention can effectively reduce side reaction and structural breakage in the charge-discharge process, enhance the overall conductivity, and finally improve the first efficiency, the specific capacity and the cycling stability of the battery.

The invention belongs to the field of negative electrode materials, and particularly relates to a silicon-graphite composite material, a preparation method and application thereof and a lithium ion battery, the preparation method comprises the following steps: mixing and slurrying silicon powder, graphite and a composite functional additive, and then carrying out ball milling modification to obtain primary composite particles; the composite functional auxiliary agent comprises an auxiliary agent A, an auxiliary agent B and an auxiliary agent C; the primary composite particles and a carbon source liquid phase are compounded and then subjected to spray drying and heat treatment, or spray pyrolysis is directly carried out, and secondary composite particles are prepared; and carrying out modification treatment on the secondary composite particles prepared in the step 2 in a surface modification liquid, and then carrying out low-temperature annealing at 150-300 DEG C to prepare the silicon-graphite composite material. The surface modification liquid is an organic solution in which conductive lithium salt and an auxiliary agent D are dissolved. Based on the combined control of the preparation process and the structure, the silicon-based negative electrode material with ultra-long cycle life and excellent low-temperature fast charging performance can be obtained.

A process for recovering materials from a black mass material obtained from lithium-ion batteries can include: i) conveying a black mass material as a black mass solid stream; ii) leaching the black mass solid stream 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 from the pregnant leach solution; vii) isolating a cobalt (Co) product from the from the pregnant leach solution; viii) isolating a nickel (Ni) product from the from the pregnant leach solution; ix) isolating a salt by-product from the pregnant leach solution; and x) isolating a lithium product the pregnant leach solution.

The invention provides natural graphite powder for a high-temperature gas cooled reactor nuclear fuel element and a preparation method of the natural graphite powder. The preparation method comprises the following steps: performing screening, crushing, shaping and grading treatment on graphite fine powder to obtain powder with the particle size of 25-35 microns; carrying out primary purification and secondary purification on the powder by using a mixed acid solution, heating the obtained chemically purified graphite powder in vacuum, carrying out high-temperature purification, introducing a mixed gas of argon and carbon tetrafluoride when the temperature reaches 1800 DEG C, and starting a circular reaction; then continuously carrying out gradient heating to 2000 DEG C, 2200 DEG C and 2400 DEG C, and respectively carrying out circular reaction at each temperature; then cooling to 300-400 DEG C, introducing mixed gas of oxygen and argon, and carrying out oxidation treatment; and finally, scattering and homogenizing to obtain a natural graphite powder finished product. The natural graphite powder provided by the invention realizes lower total impurity element content and total boron equivalent and higher specific surface area.

The invention relates to a graphite composite material, a preparation method thereof, a negative electrode and a battery, the graphite composite material comprises a graphite inner core and a coating layer coating the graphite inner core, and the coating layer comprises porous carbon coating the graphite inner core and elemental phosphorus deposited in and on the surface of the porous carbon. The performance of a conventional graphite negative electrode is reduced during high-rate charging and discharging, and the compatibility with an electrolyte is limited; according to the invention, the surface of the graphite core is firstly coated with the porous carbon, and then the phosphorus is deposited on the surface and in the pores of the porous carbon coating layer, so that the defects in the prior art are overcome, and the cycling stability and rate capability of the graphite negative electrode are improved.

The invention discloses an artificial SEI film coated graphite negative electrode material and a preparation method and application thereof, and belongs to the technical field of lithium ion battery negative electrode materials. The preparation method comprises the following steps: heating and oxidizing graphite in mixed gas of air and nitrogen, and cooling to obtain oxidized and etched graphite; then dispersing the oxidized and etched graphite in a solvent, adding methyl methacrylate and graphene, stirring and initiating an in-situ polymerization reaction, and forming a doped coating layer on the oxidized and etched graphite; and finally, carrying out vacuum drying on the coated oxidized and etched graphite, and cooling to obtain the artificial SEI film coated graphite negative electrode material. The specific surface area of graphite is increased through oxidation etching, the ion diffusivity is improved, the combination effect of the organic polymer is improved, the first efficiency of the negative electrode material is remarkably improved by combining the synergistic effect of the conductive polymerized organic matter and graphene, and the conductivity, the structural stability and the interface compatibility are enhanced.

The invention belongs to the field of graphite materials, and particularly relates to nuclear-grade natural graphite, preparation of the nuclear-grade natural graphite and application of the nuclear-grade natural graphite to preparation of high-temperature gas cooled reactor fuel spherulis.The preparation method comprises the steps that a natural graphite raw material is subjected to first-stage heat preservation treatment at the temperature T1 in advance, and a first-stage material is obtained; grinding and grading the first-section material to obtain graphite powder A and graphite powder B; then shaping and grading the graphite powder A to obtain graphite powder C; mixing the graphite powder B and the graphite powder C to obtain graphite powder D; the graphite powder D is subjected to liquid phase treatment in acid liquor in advance, and graphite powder E is obtained; the graphite powder E is subjected to two-stage gas-solid treatment with gas control and pressure control, and the nuclear-grade natural graphite is prepared. According to the method, the purity of the graphite can be obviously optimized, and in addition, the loss of strength in the purification process can be avoided, so that the graphite which is more than 5N, ultralow in nuclear reaction degradation impurities, excellent in strength and capable of meeting the application requirements of a nuclear reaction device can be obtained.

One or more aspects of the present disclosure provide methods for recovering and upgrading a secondary battery anode material. The method includes: producing a raw anode material by processing a spent battery material containing a first anode material; purifying the original negative electrode material; and generating a second anode material using the purified raw anode material. In some embodiments, the first anode material includes graphite. And the second negative electrode material comprises a graphite-silicon composite material and / or a graphite-silicon oxide composite material. The second negative electrode material may be a battery-grade negative electrode material that can be directly used for a new battery electrode.

The invention discloses a waste graphite regeneration method, a regenerated graphite negative electrode material and a secondary battery, and the waste graphite regeneration method comprises the following steps: roasting: carrying out oxidizing roasting on waste graphite slag to obtain roasted graphite; shaping: shaping and grading the roasted graphite to obtain shaped graphite; graphitization: graphitizing the shaped graphite to obtain coarse graphite; and impurity removal: performing impurity removal on the coarse graphite to obtain impurity-removed graphite. According to the method for regenerating the waste graphite, waste is turned into wealth, and the problems of environmental pollution and resource waste when the waste graphite slag is treated as solid waste are solved; the used equipment is industrial equipment mature in the market, the technology is mature, safety and reliability are achieved, the investment cost is low, and the large-scale production requirement can be met. Importantly, the high-quality battery-grade graphite negative electrode material with high purity, high capacity, long circulation and good fast charging performance can be obtained, and finally the cyclic utilization of turning waste into wealth is realized.

The invention discloses a carbon-coated surface modification method of granulated graphite powder, and belongs to the technical field of lithium ion battery negative electrode materials. The method comprises the following steps: mixing crystalline flake graphite and a hard carbon binder, granulating to obtain particles with d50 of 15-25 microns, adding a soft carbon coating agent, carbonizing, and screening to finally obtain the granulated graphite material. According to the method, two key links of granulation and carbon coating are comprehensively considered, the synergistic effect of a hard carbon binder and a soft carbon coating agent and the influence of different carbonization treatment modes such as gradient carbonization and co-carbonization on the performance of the granulated graphite powder are systematically studied, various parameters in the granulation and carbon coating processes are accurately regulated and controlled, and the performance of the granulated graphite powder is improved. Comprehensive optimization of granularity, structural stability, electrochemical performance and the like of the granulated graphite powder is realized, a brand new technical thought and method are expected to be provided for research, development and production of a lithium ion battery negative electrode material, and further development of a lithium ion battery technology is promoted; and the method has extremely important strategic significance and wide application prospect for promoting the progress of the new energy industry and optimizing the energy structure.

The invention discloses a preparation method of high-rate fast-charging graphite from a semi-calcined coke raw material, and belongs to the technical field of batteries, and the preparation method comprises the following steps: S1, crushing and shaping the semi-calcined coke raw material; s2, carrying out graphitization high-temperature treatment on the crushed and shaped semi-calcined coke; s3, mixing and coating the semi-calcined coke subjected to graphitization high-temperature treatment with a coating agent; s4, performing high-temperature carbonization heat treatment on the semi-calcined coke mixed and coated with the coating agent; s5, screening the petroleum coke semi-calcined coke subjected to high-temperature carbonization heat treatment to obtain a semi-calcined coke raw material high-rate fast-charging graphite; the material has the advantages of large discharge capacity, good cycle performance, good electrochemical performance, high discharge plateau and plateau retention rate, good large-current charge-discharge performance, good safety, good adaptability to electrolyte and other additives, stable product properties, almost no difference between batches, simple and feasible preparation method, and suitableness for industrial production.

The invention relates to the technical field of sodium ion batteries, in particular to a carbon-carbon composite material and a preparation method thereof, a negative electrode plate and a sodium ion battery. The carbon-carbon composite material comprises a composite matrix and a soft carbon coating layer coating the composite matrix, and the composite matrix comprises graphite and hard carbon; the compaction density rho pc of the carbon-carbon composite material satisfies 1.00 g / cm < 3 > < = rho pclt; 1.10 g / cm < 3 >; the volume resistivity rho of the carbon-carbon composite material is 2.20 omega.mlt; rho < lt >; and 3.20 omega.m. By doping the graphite and coating the soft carbon, the electronic conductivity of the carbon-carbon composite material can be effectively improved, and the inherent high compaction characteristic of the graphite and the soft carbon is beneficial to the improvement of the compaction density of the carbon-carbon composite material.

The invention discloses a preparation method of a high-rate wide-temperature-range regenerated graphite negative electrode material, and belongs to the technical field of lithium ion battery recovery. The invention provides a preparation method of a high-magnification wide-temperature-range regenerated graphite negative electrode material, which combines a multi-section high-temperature synergistic treatment means and a lithium-rich catalytic surface modification technology, realizes impurity removal of a waste graphite negative electrode under the condition of lower energy consumption, and realizes effective repair of a graphite crystal structure. According to the method, through the synergistic effect of ultrahigh-temperature gasification and the reactive atmosphere, trace metal impurities which are most difficult to remove and fluorine-containing compounds with thermal stability are almost thoroughly removed, and the purity of the regenerated graphite is improved to be close to the level of a primary material (the purity gt is 99.9%); and a lithium-rich catalytic surface modification technology is adopted, so that the graphite surface can be stabilized, and the rate capability and low-temperature performance of the material are improved. The graphitization degree (gt; 95%) of the material is remarkably improved through the in-situ defect repairing effect driven by ultrahigh temperature, and the highly-ordered layered crystal structure and the excellent conductive network of the material are recovered.

A negative electrode material, comprising composite particles. Each of the composite particles comprises a core and an amorphous carbon coating layer located on the surface of the core, wherein the core comprises a graphite framework and amorphous carbon in the graphite framework; and the amorphous carbon coating layer has a thickness of 10-50 nm. Raman spectral area scanning is performed on the negative electrode material, and there are 400 Raman spectral area scanning points; and the average ID / IG value of the Raman spectrum of the negative electrode material is 0.10-0.20, wherein the proportion of the number of scanning points having a single-point ID / IG value of less than 0.2 is greater than 60%. The negative electrode material has a high compaction density, a high capacity, a low expansion rate, good rate performance, and good high-temperature cycling performance.

The present invention relates to a dispersant for graphite and graphene and its application. The composition is a synergistic combination of alkyl sulfosuccinate and polyalkylene glycol. Appropriate adding amount thereof can quickly and easily disperse graphite and graphene in the medium, improve its dispersion uniformity and stability, delay its sedimentation, and inhibit its re-accumulation. Furthermore, the present invention can apply graphite and graphene to other media besides non-water-based or organic solvents. The composition of the present invention does not contain flammable volatile chemicals, any fluorine-, silicon- or phosphorus-based compounds, or any aromatic substances. The present invention can not only reduce environmental pollution but also improve the operational safety of relevant personnel.

The present invention provides a method for preparing battery-grade graphite from waste lithium-ion batteries comprising steps of: (i) implementing heat treatment on scrap mixture comprising cathode and anode materials of waste lithium-ion batteries and their components thereof; (ii) adding an acid solution containing redox agent into the mixture to obtain leaching liquid and leaching slag and washing the leaching slag with water; (iii) adding a solvent to the washed leaching slag comprising at one selected from hydrocarbon, alcohol, ketone, ether and water and mixing by stirring, milling or sonication and further adding a carbon source material that is completely dispersed in the slurry, and removing the solvent from the slurry to obtain mixed graphite; (iv) putting the mixed graphite into a furnace for oxygen-free heating and carbonization to obtain coated graphite; and (v) putting the coated graphite into a high temperature graphitization furnace for oxygen-free heating and graphitization to obtain recycled graphite.

The invention provides a surface modified carbon negative electrode material, a preparation method thereof and a battery. The preparation method comprises the following steps: mixing a graphite carbon source and a pore-forming agent, and graphitizing the obtained mixture to form porous graphite; performing oxidation treatment on the porous graphite to prepare porous graphite oxide particles; the porous graphite oxide particles are placed in a tin source solution containing tin cations, the tin source solution is attached to the surfaces of holes of the porous graphite oxide particles, and tin oxide attached to the surfaces of the holes of the porous graphite oxide particles is formed based on the tin source solution; and the porous graphite oxide particles are placed in a carbon-containing reducing gas environment to be subjected to calcination treatment, and the carbon-coated tin nanowires are prepared on the basis of the tin oxide. According to the preparation method, the surface and holes of the carbon negative electrode material are modified by adopting the carbon-coated tin nanowires, so that the discharge performance of the battery at relatively high rate can be effectively improved.

The invention discloses a lithium ion battery artificial graphite negative electrode material, a preparation method thereof and a lithium ion solid-state battery, and belongs to the technical field of lithium ion solid-state batteries. Carrying out flash evaporation Joule heating on the pretreated carbon source material in an inert atmosphere, then rapidly cooling to obtain a graphitized intermediate, and screening, washing and drying the graphitized intermediate; mixing and reacting the graphitized intermediate with strong acid under an ice bath condition, and oxidizing and expanding the graphitized intermediate to obtain expanded graphite; and mixing the expanded graphite with mercaptan acetic acid and ethyl acetate, adding a catalyst, and reacting for a certain time to obtain the artificial graphite negative electrode material of the lithium ion battery. According to the invention, by introducing a flash Joule pulse graphitization technology, sulfur-oxygen dual-function synergistic modification and structure-performance integrated design, three technical bottlenecks of a traditional artificial graphite negative electrode material are systematically solved: the rate capability is limited, the interface stability is poor and the volume expansion is obvious.

The invention belongs to the technical field of lithium ion negative electrode materials, and particularly relates to a graphite negative electrode material and a preparation method thereof. The graphite negative electrode material comprises: (1) a three-dimensional porous graphite sheet layer matrix; (2) a nitrogen-doped amorphous carbon layer coated on the surfaces of the graphite particles, wherein the nitrogen element exists in the form of pyridine nitrogen and graphite nitrogen; and (3) after the material is subjected to CO2 atmosphere heat treatment, an aperture micropore structure is formed on the surface. The preparation method comprises the following steps: (1) carbonizing raw materials; (2) crushing treatment; (3) wrapping and granulating; (4) high-temperature treatment; and (5) performing subsequent treatment. According to the invention, the interface stability is obviously improved, the ion diffusion kinetics is optimized, the cycle life of the battery is obviously prolonged, the uniformity and process stability of the coating layer are improved, the energy consumption of high-temperature treatment is reduced, and the comprehensive performance and suitability of the battery are obviously optimized by reasonably controlling the capacity ratio of the positive electrode and the negative electrode and the content of a specific additive in the electrolyte.

The invention discloses a production method of a special graphite material bipolar plate, a production raw material formula comprises a graphite raw material and an impregnant, and the component of the impregnant comprises epoxy resin. The method mainly comprises the following steps: S1, continuously pressing a graphite raw material into a low-density flexible graphite plate through a rolling process; s2, placing a low-density flexible graphite plate in an impregnation container, injecting the impregnant, and enabling the impregnant to fully permeate under a vacuum condition; s3, the impregnated graphite plate is placed in a pressing mold, and a monopolar plate with a runner structure is formed through pressing; cleaning the surface of the monopolar plate by using a cleaning agent; and S4, the prefabricated monopolar plate is heated and cured. The preparation method has the advantages that the prepared special graphite material bipolar plate has the advantages of excellent conductivity, chemical stability, toughness, continuous productivity, light weight and the like, the thinnest thickness can reach 0.8 mm, and the requirement of a high-end passenger car battery on the performance of the graphite material bipolar plate can be completely met.

Provided in the present disclosure are a negative electrode sheet, a secondary battery, an electric device, and a negative electrode active material and a preparation method therefor. The negative electrode sheet comprises a negative electrode current collector and a negative electrode film layer located on at least one surface of the negative electrode current collector, wherein the negative electrode film layer comprises a negative electrode active material. The negative electrode active material comprises first artificial graphite and second artificial graphite, wherein the first artificial graphite comprises primary particles, and the second artificial graphite comprises secondary particles. The powder OI value of the negative electrode active material is 2.5-6.5; and the powder compaction density of the negative electrode active material under a pressure of 50,000 N is 1.75-1.94 g / cc.

The invention relates to the technical field of lithium ion battery negative electrode materials, in particular to a method for in-situ construction of a natural graphite-based composite negative electrode material on a current collector. The preparation method comprises the following steps: uniformly distributing polyamide acid in pore structures among crystalline flake graphite with submicron particle size in spherical graphite particles by adopting an impregnation method to prepare a polyamide acid / powder 2 compound; mixing the polyamic acid / powder 2 compound with polyamic acid, coating the mixture on a current collector, and curing to obtain a polyimide / powder 2 compound composite film loaded on the current collector; and finally, converting the polyimide inside and on the surface of the powder 2 into graphene by utilizing a laser-induced composite film, namely generating graphene in situ in a pore structure between crystalline flake graphite with submicron particle size inside spherical graphite particles and on the surface of the spherical graphite particles to prepare the natural graphite-based composite negative electrode material.

The invention relates to the technical field of lithium battery negative electrode materials, in particular to a lithium battery graphite negative electrode material and a preparation method thereof. The preparation method of the graphite negative electrode material comprises the following steps: taking natural graphite as a raw material, sucking the natural graphite into a jet mill through a high-pressure fan for crushing, shaping, spheroidizing, shaping and the like to obtain a pre-product graphite powder, modifying the graphite powder, and performing secondary crushing and spheroidizing; according to the graphite negative electrode material prepared through modification and secondary spheroidization, the mechanical strength and the wear resistance of the material are improved, secondary spheroidization is facilitated, the spheroidization degree of the material is good, volume expansion is inhibited, the conductivity and the structural stability can be improved, and the service life of the material is prolonged. The cycle service life in the battery is prolonged; and the electrochemical performance is improved.

The preparation method comprises the following steps: S1, adding silicon powder, graphite, a carbon source and a pore-forming agent into a solvent to obtain slurry; the pore-forming agent comprises ammonium citrate and polylactic acid; s2, performing spray drying on the slurry to obtain precursor microspheres; s3, the precursor microspheres are subjected to first-stage low-temperature oxidation to form macropores, second-stage medium-temperature melting to form mesopores, third-stage high-temperature carbonization and cooling shaping, the heat preservation temperature of the first-stage low-temperature oxidation is 180-200 DEG C, the heat preservation temperature of the second-stage medium-temperature melting is 340-360 DEG C, the heat preservation temperature of the third-stage high-temperature carbonization is 800-900 DEG C, and the gradient pyrolysis dual-pore-forming silicon-carbon negative electrode material is obtained. Through combined use of ammonium citrate and polylactic acid and control of gradient pyrolysis conditions, synergistic distribution of double-peak gradient pores is formed, and effective improvement of the first effect and the cycle performance can be realized.

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.

A dispersion, methods of making the same, applications of the dispersion to graphitic material and the resulting coated particles are disclosed. The dispersion includes ≤55% wt. coal tar pitch (softening point 100° C.-95° C.), ≤60% wt. dispersant, and the balance a non-aromatic solvent such as water or alcohol. Pitch particles in the dispersion are preferably ≤10 μm with a distribution of D50<15 μm. The pitch particles are micronized, such as by dry and / or wet milling with the dispersant and aqueous solvent to achieve the desired pitch particle size and distribution. This aqueous dispersion may be mixed with natural or synthetic graphitic material having a diameter of 5-20 μm in a ratio of 5%-30% pitch to graphite, dried and carbonized to form coated particles having a graphitic core at least partially coated by pitch particles.