1898 results about "Amorphous carbon" patented technology

The invention discloses a carbon-coated lithium iron phosphate active material and a preparation method thereof, a positive pole piece and a lithium battery, and relates to the technical field of lithium batteries. According to the method, the structure of the carbon coating layer of the carbon-coated lithium iron phosphate active material is comprehensively evaluated through the carbon coating factor beta, # imgabs0 can evaluate the amount of graphitized carbon on the unit surface area of the carbon-coated lithium iron phosphate active material, and compared with amorphous carbon, the graphitized carbon has more excellent conductivity and can better improve the conductivity of a lithium iron phosphate matrix. By regulating and controlling a carbon coating layer structure of the carbon-coated lithium iron phosphate active material, a carbon coating factor beta meets a specific value range, so that the uniform conductivity of the carbon-coated lithium iron phosphate active material is improved; the lithium ion battery prepared from the lithium ion battery positive electrode material is small in internal resistance growth rate, charge transfer impedance Rct sample standard deviation and Warburg coefficient sample standard deviation, and the overall electrical performance of the lithium ion battery is improved.

The invention discloses a transition metal nitride and amorphous carbon composite coated and modified lithium manganese iron phosphate composite material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The vanadium nitride / amorphous carbon is adopted to perform composite coating modification on the lithium manganese iron phosphate material, so that the composite positive electrode material is more stable in structure. The use of vanadium nitride reduces the coating amount of carbon, and avoids the problems of coating layer thickening caused by high carbon content and Li < + > diffusion hindering caused by reduction of tap density of active substances. Vanadium nitride not only has good conductivity, but also has good Li < + > conductivity transmission performance, Li < + > de-intercalation can be rapidly achieved, the conductivity of the material is improved, meanwhile, a Li < + > diffusion channel on the surface of the positive electrode material is further dredged and increased, and the capacity loss of the modified material is reduced.

The invention provides a semiconductor device and a manufacturing method thereof, and the method comprises the steps: providing a substrate, forming a gate structure and a side wall on the substrate, and enabling the gate structure to comprise a gate dielectric layer, a dummy gate, a first hard mask layer, a second hard mask layer and an amorphous carbon layer; forming a first patterned photoresist layer covering the NMOS region; forming grooves in the substrate at two sides of the gate structure in the PMOS region, and reserving an amorphous carbon layer with a partial thickness on the second hard mask layer; the first patterned photoresist layer is removed; and removing the amorphous carbon layer by adopting an ashing process. In the process of forming the groove in the PMOS region, the amorphous carbon layer protects the second hard mask layer below the amorphous carbon layer from being thinned, and after the amorphous carbon layer is removed, the thickness of the second hard mask layer in the two regions can be ensured to be consistent, so that the height of the dummy gate is ensured to be consistent, and the electrical performance of the device is improved.

The invention relates to the technical field of photovoltaic silicon crystal waste treatment, and discloses a method for preparing a porous silicon carbon negative electrode material with good conductivity from photovoltaic silicon crystal waste, and the method comprises the following steps: step 1, preparing micron-sized silicon particles; step 2, preparing micron-sized porous silicon particles; step 3, preparing nano-scale porous silicon particles which are coated by TiO2 and are supported by an N-crosslinked carbon skeleton; and 4, preparation of porous silicon carbon negative electrode particles with good conductivity: mixing TiO2 coated and N-crosslinked carbon skeleton supported nanoscale porous silicon particles with a carbon-containing compound and a B-containing sintering aid, introducing the mixture into a rotary furnace for sintering, and constructing an outermost amorphous carbon coating layer. The raw material of the prepared silicon-carbon negative electrode particle is derived from photovoltaic silicon crystal waste, the production cost is low, the prepared silicon-carbon negative electrode material with good conductivity is of a core-shell structure, the volume expansion effect of the material can be effectively relieved, the conductivity is improved, the high-rate discharge performance of a battery is improved, and the cycle life is prolonged.

The invention relates to the technical field of batteries, in particular to a silicon-carbon negative electrode material, a preparation method thereof and a lithium ion battery. The invention provides a silicon-carbon negative electrode material. The silicon-carbon negative electrode material comprises silicon nanoparticles, a porous carbon skeleton, an amorphous carbon layer and a carbon material array structure, pores of the porous carbon skeleton are filled with the silicon nanoparticles; the amorphous carbon layer is coated on the surface of the porous carbon skeleton; the carbon material array structure vertically grows on the surface of the amorphous carbon layer; the carbon material array structure comprises a carbon nanotube array and / or a graphene array. According to the silicon-carbon negative electrode material disclosed by the invention, the compressive strength and the conductivity of the silicon-carbon negative electrode material are improved by vertically growing the carbon nanotube array and / or the graphene array on the surface; therefore, the cycle performance and the rate capability are improved, and the cycle expansion rate is reduced.

The invention discloses a LiAlO2 fast ion conductor coated silicon-carbon composite material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion battery materials. The LiAlO2 fast ion conductor coated silicon carbon composite material has a core-shell structure; an inner core of the composite material is a silicon-carbon composite material, the silicon-carbon composite material is formed by coating a three-dimensional carbon material with an amorphous carbon layer and loading a nano silicon compound, a shell of the composite material is a LiAlO2 fast ion conductor layer, and the silicon-carbon composite material with a three-dimensional network structure is constructed, and the surface of the silicon-carbon composite material is coated with the LiAlO2 fast ion conductor layer, so that the composite material is obtained. According to the present invention, with the LiAlO2, the volume expansion of the nanometer silicon during the charge-discharge process can be effectively relieved, the stability of the silicon-carbon composite material structure can be improved so as to significantly improve the cycle performance of the battery, and the LiAlO2 can provide the rapid channel for the transmission of the lithium ion during the charge-discharge process so as to improve the rate performance of the battery;

The invention relates to the technical field of lithium ion batteries, and provides a negative plate and a lithium ion battery. The negative plate comprises a negative current collector and a negative active material layer arranged on at least one side surface of the negative current collector; the negative electrode active material layer comprises a first negative electrode active material layer and a second negative electrode active material layer, and the second negative electrode active material layer is arranged between the negative electrode current collector and the first negative electrode active material layer; the first negative electrode active material layer comprises an amorphous carbon coated graphite material, and the second negative electrode active material layer comprises a graphite material; the Dv50 of the amorphous carbon coated graphite material is recorded as P1 [mu] m, the Dv50 of the graphite material is recorded as P2 [mu] m, and P1 and P2 satisfy: P1gt; p2. The negative plate adopts a double-layer coating design to form the negative plate of which the surface layer has quick charge and the bottom layer has high energy density, so that the negative plate has both high energy density and quick charge performance.

The invention discloses a silicon-carbon negative electrode material and a preparation method thereof, the silicon-carbon negative electrode material has a core-shell structure, a high-capacity nano silicon-carbon composite material and graphite are uniformly dispersed to form a core layer, and a carbon coating layer is formed outside the core layer; the high-capacity nano silicon-carbon composite material comprises silicon, graphite and amorphous carbon, according to the preparation method, a high-capacity nano silicon carbon precursor, graphite and an organic carbon source are fully mixed, mechanically fused and then sintered at a high temperature to form the silicon carbon negative electrode material with a carbon coating layer as a shell and the high-capacity nano silicon carbon precursor and graphite uniformly dispersed inside, a multi-layer expansion buffer effect can be formed, and the expansion rate of particles is reduced; compared with a negative electrode material with a certain capacity formed by mixing a high-capacity silicon-carbon negative electrode material and graphite, particles have similar expansion degrees, and the problem that the cycle performance and the stability are reduced due to inconsistent expansion of the graphite and the silicon-carbon particles is solved.

A wear-resistant and low-friction coated piston ring and a preparation method therefor are provided. The OD surface diamond-like carbon coating consists sequentially of a first metal interlayer, a second metal interlayer, a gradient DLC layer, alternating high / low hardness DLC layers, and an outer running-in DLC layer. The side surface diamond-like carbon coating consists sequentially of a metal interlayer, a gradient DLC layer, and alternating high / low hardness DLC layers. The preparation method employs physical vapor deposition to sequentially deposit composite DLC coatings on the OD surface and side surface of the piston ring. The coating is a tetrahedral amorphous carbon structure, exhibiting good thickness uniformity and fine grain structure. This improves the wear resistance of the piston ring's OD surface and side surface, reduces the aggressiveness of the piston ring side surface against the piston ring groove, and meanwhile avoids adhesion.

The invention provides a natural graphite composite negative electrode material and a preparation method thereof, and a lithium ion battery, the natural graphite composite negative electrode material comprises natural graphite, a fluffy net-shaped three-dimensional carbon network coated outside the natural graphite, and an amorphous carbon coating layer arranged outside the fluffy net-shaped three-dimensional carbon network; wherein magnesium ions and / or aluminum ions are dispersed in the fluffy three-dimensional carbon network, and copper particles and / or silver particles are doped in the amorphous carbon coating layer. The natural graphite composite negative electrode material provided by the invention has a three-dimensional conductive network, is doped with metal, and has good conductivity and excellent electrochemical cycle performance.

The invention discloses a graphite composite material as well as a preparation method and application thereof, and belongs to the technical field of preparation of negative electrode materials. The graphite composite material has a core-shell structure, and the core of the core-shell structure comprises magnetic metal oxide doped porous graphite; and the shell of the core-shell structure comprises a carbon nanotube, a lithium supplement agent and amorphous carbon. The specific capacity is improved by doping the magnetic oxide in the porous graphite, and the carbon nanotube lithium supplement agent amorphous carbon is coated on the porous graphite, so that the energy density and the fast charging performance of the battery are improved.

The invention belongs to the field of flow energy storage battery materials, and particularly relates to a multi-dimensional conductive material, a preparation method thereof and application of the multi-dimensional conductive material in an all-vanadium flow battery. Graphite and multi-walled carbon nanotubes are bonded together by adopting a biomass precursor, a carbon base of biomass is converted into graphitized carbon nanotubes through step-by-step pyrolysis, amorphous carbon in the graphite and the original carbon nanotubes is further graphitized, and finally the multi-dimensional conductive material with the carbon nanotubes inserted on a graphite matrix is formed. The multidimensional characteristic of the surface of the multidimensional conductive material is beneficial to formation of a longitudinal conductive path of the bipolar plate and reduction of vertical body resistance of the bipolar plate, and is also beneficial to wetting of epoxy resin among conductive particles and mechanical interlocking of molecular chains of the epoxy resin, so that the mechanical strength of the bipolar plate is improved, the use performance of the bipolar plate is effectively enhanced, and the service life of the bipolar plate is prolonged. The requirement of long-time operation of the flow battery is met, the material cost of the flow battery is relatively reduced, the industrialization of the bipolar plate is powerfully promoted, and the application value is very good.

The invention provides a phosphorus-carbon composite material with a core-shell structure as well as a preparation method and application of the phosphorus-carbon composite material. The phosphorus-carbon composite material with the core-shell structure comprises a pre-sodium-modified phosphorus-carbon core material and a shell coating the surface of the pre-sodium-modified phosphorus-carbon core material, and the material of the shell comprises amorphous carbon and organic sulfonate. By regulating and controlling the structure and composition of the phosphorus-carbon composite material, the specific capacity, the first coulombic efficiency and the fast charging performance of the hard carbon material are improved.

The invention relates to the technical field of lithium ion battery negative electrode materials, in particular to a graphite composite material and a preparation method and application thereof. The preparation method comprises the following steps: heating metal lithium to obtain lithium steam, and depositing the lithium steam into a metal organic framework material to obtain a lithium-doped metal organic framework material; a chemical vapor deposition method is adopted, carbon source gas and oxygen are introduced, amorphous carbon is deposited in the lithium-doped metal organic framework material, and an amorphous carbon and lithium co-doped metal organic framework material is obtained; and mixing the amorphous carbon and lithium co-doped metal organic framework material, a metal salt solution and a graphite material to obtain a mixture, heating, carrying out solid-liquid separation, taking solid components, introducing carbon source gas, and reacting to generate carbon nanotubes, thereby obtaining the graphite composite material. When the prepared graphite composite material is applied to a lithium ion battery as a negative electrode material, the battery has the advantages of high first efficiency, good liquid retention performance, low expansion, fast charge, good cycle performance and the like.

The objective of the present invention is to provide a micron-sized porous sodium ferrous sulfate / carbon composite positive electrode material and a sodium-ion battery or sodium battery produced therefrom. SOLUTION: The composite material of the present invention includes a sodium ferrous sulfate / carbon composite material with and / or without metal doping elements, which is prepared by coprecipitation and solid-state calcination, and the particle size is 2-30 nm, has a porous structure, and is composed of densely packed 80-200 nm primary particles densely covered with amorphous carbon, and the surface of the micron particles is covered with a thin layer of reduced graphene to form a three-dimensional conductive network. The micron-sized particle positive electrode material has a high tap density, which is helpful in increasing the volumetric energy density of the battery, and the material has the advantages of abundant raw material reserves, low cost, high operating voltage, good rate characteristics and cycle stability as the positive electrode of sodium ion batteries or sodium batteries, and the preparation process of the material is simple. The sodium ion batteries or sodium batteries of the present invention have the advantage of high energy density and have the prospect of broad market application.

The invention relates to a graphite negative electrode material and a preparation method thereof, a negative electrode plate and an electrochemical device. The graphite negative electrode material comprises secondary particles formed by granulating and carbonizing 20%-90% of a doped porous graphite precursor, 5%-30% of hard carbon particles and 5%-50% of a coating agent, in the secondary particles, the hard carbon particles are at least partially filled in holes of the doped porous graphite precursor, and the coating agent is at least partially filled in the holes of the doped porous graphite precursor. And after the coating agent is carbonized, at least part of the coating agent forms amorphous carbon to coat the outer layer of the doped porous graphite precursor. According to the scheme provided by the invention, the doped porous graphite precursor can be compounded with the hard carbon particles and the coating agent to obtain the graphite negative electrode material with high capacity and fast charging performance.

The invention discloses a calcining carbon removal-supercritical expansion stripping method for regenerating graphene from graphite of a waste lithium battery, and belongs to the field of lithium battery recovery and nano material preparation. Comprising the following steps: treating the waste lithium battery to obtain waste lithium battery positive and negative electrode mixed powder, and then roasting to obtain battery powder; leaching the battery powder in a nitric acid solution to obtain purified graphite slag; the method comprises the following steps: mixing graphite slag with supercritical gas fluid, treating, quickly releasing pressure to normal pressure, and separating to obtain graphene. According to the method, on the basis of interlayer structure characteristics of the waste graphite negative electrode, organic matters and amorphous carbon are removed through multi-stage calcination, a supercritical N2 / CO2 mixed fluid permeation and pressure relief expansion synergistic stripping technology is combined, and low-damage dissociation is achieved through graphite microcracks. According to the method, physical stripping and liquid nitrogen shock cooling strengthening are coupled, and the obtained graphene sheet layer is high in integrity and few in structural defect and can be directly used for manufacturing conductive composite materials and energy storage devices.

The invention provides a sphere-like silicon-carbon negative electrode material and a preparation method and application thereof, and particularly relates to the technical field of negative electrode materials, the negative electrode material comprises a sphere-like porous carbon skeleton, silicon nanoparticles distributed in the sphere-like porous carbon skeleton, and an amorphous carbon layer coating the surface of the sphere-like porous carbon skeleton, the particle appearance of the sphere-like porous carbon skeleton is of a round irregular or asymmetric polyhedral structure and comprises one or more of a potato shape, an ellipse shape, an olive shape, a long strip shape and a pomegranate shape, the particle of the sphere-like porous carbon skeleton is provided with a plurality of asymmetric faces, fillets are formed between the faces, and the radius of the fillets does not exceed 20 microns. The problem of structural damage of the material under the action of external force such as rolling can be effectively relieved, good mechanical stability is kept, excellent bonding performance can be achieved in the electrode coating process, the ion transmission path of the material is improved, and the electronic conductivity and the lithium ion diffusion performance are improved.

The invention provides a hydrogen-containing amorphous carbon film with long wear life and a preparation method thereof, and belongs to the field of composite material preparation. The a-C: H thin film with the long wear life comprises a substrate, and a Ti transition layer, a TiN hydrogen resistance layer, a TiCHx hydrogen storage layer, a Ti / C / H transition layer and a hydrogen-containing a-C layer which are formed on the surface of the substrate from bottom to top. Through connection transition between the Ti transition layer and the metal substrate, strong combination between the hydrogen-containing DLC film and the metal substrate is realized. By depositing the TiN hydrogen blocking layer, hydrogen atoms in the TiCHx hydrogen storage layer are prevented from diffusing and losing towards the direction of the substrate. By depositing the TiCHx hydrogen storage layer, hydrogen atoms are fixed and stored by using the hydrogen storage characteristic of Ti, and the hydrogen atoms are provided for the surface hydrogen-containing a-C layer in the working process of the thin film. By depositing the Ti / C transition layer, connection transition between the TiCHx hydrogen storage layer and the hydrogen-containing a-C layer is achieved, compatibility is improved, and good combination is achieved.

The invention discloses a lithium manganese iron phosphate positive electrode material coated with a carbon layer based on a CVD (chemical vapor deposition) method and a preparation method, the preparation method comprises the following steps: forming a uniform carbon coating layer on a lithium manganese iron phosphate precursor based on a CVD coating process, mixing the lithium manganese iron phosphate precursor with the uniform carbon coating layer and a lithium salt, and carrying out co-sintering, and the lithium salt can permeate through the carbon layer to form a lithium-doped uniform carbon coating layer. According to the method, the coating effect is improved, the problem that uniform coating cannot be formed on the surface of the precursor in a traditional carbon coating process is effectively solved, precipitation of trivalent manganese ions at a high temperature can be slowed down, the problem that the capacity exertion is reduced due to the fact that an amorphous carbon layer formed by a CVD cracking coating process affects lithium ion deintercalation is solved, and the performance of the lithium ion battery is improved. The safety and the service life of the battery are improved.

The invention discloses a high-conductivity carbon-coated lithium iron phosphate positive electrode material and a preparation method thereof, and relates to the technical field of lithium iron phosphate positive electrode materials, the high-conductivity carbon-coated lithium iron phosphate positive electrode material comprises a spherical lithium iron phosphate matrix, modified lithium niobium vanadate uniformly coating the exterior of the nanoscale spherical lithium iron phosphate matrix, and a composite carbon layer uniformly coating the exterior of the modified lithium niobium vanadate; wherein the spherical lithium iron phosphate matrix has a smaller specific surface area, so that the reduction of side reaction is facilitated, and the interface impedance can be reduced; the modified lithium niobium vanadate can improve the electronic conductivity of the positive electrode material and the diffusion rate of lithium ions; an organic carbon source in the outermost composite carbon layer is carbonized to form a continuous amorphous carbon layer which uniformly coats the surfaces of the particles, so that a basic electron channel is provided, and side reaction of an electrolyte is inhibited; the inorganic carbon source constructs a three-dimensional conductive skeleton, and a long-range conductive network is formed through the bridging effect of nanowires / sheets, so that the interface contact resistance is reduced, and the conductivity of the positive electrode material is improved.

The invention relates to the technical field of lithium ion batteries, and provides a lithium ion battery, which comprises a negative plate and an electrolyte, the negative plate comprises a negative active material, the negative active material comprises a graphite matrix and a coating layer, and the coating layer comprises an amorphous carbon material; the electrolyte comprises a carbonic ester additive and a chalcogenide additive; based on the total mass of the electrolyte, the mass ratio of the carbonic ester additive is 0.01%-8%, and the mass ratio of the sulfur additive is 0.01%-3%; the mass ratio of the carbonic ester additive to the sulfur additive is 0.3-300. In the lithium ion battery, the negative electrode active material used by the negative electrode is the graphite matrix surface coated amorphous carbon material, so that the low-temperature charging performance of the battery can be improved. Meanwhile, the carbonic ester additive and the sulfur additive are added into the electrolyte, so that the reaction activity of the negative electrode active material can be reduced, side reactions are reduced, the high-temperature performance of the battery is improved, and the battery has high and low temperature performance.

The invention discloses a negative electrode material, a negative electrode plate and a secondary battery, and relates to the technical field of secondary batteries. The negative electrode material comprises natural graphite and amorphous carbon filled in pores of the natural graphite; the particle hardness of the negative electrode material is 0.28 GPa to 0.4 GPa, and the elastic modulus of the negative electrode material is 7.0 GPa to 8.0 GPa; when the compaction density of the tablet of the negative electrode material is 1.5-2.0 g / cm < 3 >, the orientation OI value of the tablet of the negative electrode material is y, and y is more than 4 and less than or equal to 11. When the negative electrode material is applied to the secondary battery, the first coulombic efficiency and the cycling stability can be remarkably improved.

The invention discloses a hard carbon negative electrode material for a sodium-ion battery as well as a preparation method and application of the hard carbon negative electrode material. The hard carbon negative electrode material for the sodium ion battery is a graphite microcrystal cross-linked hard carbon material, and the carbon layer spacing is 0.37 nm to 0.40 nm; the range of the Raman D / G (w) value is 1.1-1.6; and the compaction density of the 3T powder is 0.96 g / cm < 3 >-1.10 g / cm < 3 >. The hard carbon negative electrode material for the sodium ion battery has high capacity, high compaction, high magnification and high cycle performance; meanwhile, amorphous carbon is directionally etched through chemical reaction, and a second carbon source is compounded on the basis, so that the crosslinking degree between graphite microcrystals (a structural unit of hard carbon) is improved, open pores are further promoted to be converted into closed pores, sodium storage sites of the closed pores are increased, and the density and conductivity of the hard carbon material are improved; and the capacity, the compaction density, the multiplying power and the cycle performance are improved.

The invention provides an asphalt solid-phase composition for coating, a modified asphalt coated natural graphite negative electrode material, preparation of the modified asphalt coated natural graphite negative electrode material and a lithium ion battery, and the asphalt solid-phase composition for coating is used for forming an amorphous carbon coating layer coated on the surface of natural graphite and comprises coated asphalt and a modification additive, the mass ratio of the natural graphite to the coated asphalt to the modification additive is 1000: (45-80): (3-12); the modification additive comprises a saturated long-chain component, a low-molecular wax component and a component containing a modification group in a mass ratio of (2-10): (0.5-5): (0.5-7). By adding the modification additive, the softening point and viscosity of the asphalt are reduced, the wetting contact property of the asphalt to graphite is improved, the density and uniformity of a coating layer are improved, and the electrochemical performance of the natural graphite negative electrode material is further improved. The negative electrode material provided by the invention has higher first-cycle coulombic efficiency, better cycle performance, lower impedance and lower specific surface area under the condition of low asphalt addition amount.

The present exemplary embodiments relate to a lithium metal electrode, a method of manufacturing the same, and a lithium secondary battery including the same. According to an exemplary embodiment, a lithium metal electrode including: a current collector and a metal layer which is disposed on at least one surface of the current collector and includes a lithium component, in which a protective layer including amorphous carbon and lithium-ion conduction promoting ceramic particles is formed on a surface of the metal layer, may be provided.

The invention discloses a silicon-carbon material as well as a preparation method and application thereof. The silicon-carbon material comprises nitrogen-doped porous carbon and an amorphous carbon layer coating the nitrogen-doped porous carbon, and pores of the nitrogen-doped porous carbon are filled with boron-doped nano silicon. The nitrogen-doped porous carbon improves the affinity of silane gas while improving the electron conductivity, a high-conductivity and high-density silicon-carbon composite structure is realized, the boron-doped nano silicon and the nitrogen-doped porous carbon form a nano heterojunction site, and the migration rate of lithium ions is improved, so that electrochemical reaction kinetics is improved, and the electrochemical performance of the lithium ion battery is improved. The material has the advantages of high rate and long cycle performance.

Systems or techniques are provided for facilitating improved digital twin calibration for scientific instruments. In various embodiments, a system can synchronize, via execution of a state-wide Bayesian filter, a parametric state of a digital twin with a physical state of a scientific instrument. In various instances, the state-wide Bayesian filter can comprise a set of calibration iterations, each of which can comprise a Bayesian update to an entirety of the parametric state based on an iteration-common observable that is exhibitable by the scientific instrument and simulatable by the digital twin. In various cases, the scientific instrument can be a charged-particle microscope, the parametric state of the digital twin can be an aberration coefficient vector of the charged-particle microscope, and the iteration-common observable can be a Fourier transform of a convergent beam electron diffraction pattern of an amorphous carbon specimen captured by the charged-particle microscope.

The invention discloses a high-initial-efficiency fast-charge graphite composite material and a preparation method thereof, the composite material is of a core-shell structure, the core is graphite, and the shell is lithium sulfonate / lithium molybdate and an amorphous carbon coating layer thereof; the mass ratio of the shell is 5-15 wt% according to the mass ratio of the composite material being 100%. The preparation method comprises the following steps: adding a molybdenum compound into a solvent to prepare a solution, adding graphite oxide, an inorganic lithium salt and a carbon nanotube conductive solution, reacting for 2-12 hours at the temperature of 50-120 DEG C, filtering, carbonizing filter residues to obtain a lithium molybdate conductive agent coated graphite material, and depositing a lithium sulfonate derivative on the surface of the lithium molybdate conductive agent coated graphite material by an atomization method to obtain the lithium molybdate conductive agent coated graphite material. The electron and ion conductivity of the material can be improved, and the rate and the first efficiency of the material can be improved.

The invention relates to the technical field of electrode materials, and discloses a preparation method of a lithium iron manganese phosphate material and a lithium ion battery. The lithium iron manganese phosphate material is prepared by the following steps: performing in-situ growth in a cavity of polyethylene glycol-sucrose hybrid aerogel with a three-dimensional porous network structure to form a manganese iron phosphate precursor; the hybrid aerogel can control excessive agglomeration and disordered growth of ferromanganese phosphate precursor particles and avoid particle agglomeration, so that the finally formed lithium ferromanganese phosphate material particles are finer and more uniformly distributed, and an amorphous carbon-aluminum layer is formed during later calcination, so that the performance of the material is improved. The surface of lithium manganese iron phosphate particles is tightly coated with the composite material, electron transmission can be accelerated, particle pulverization can be reduced, meanwhile, corrosion of corrosive components in electrolyte can be inhibited, interface side reactions such as transition metal ion dissolution can be reduced, and finally the conductivity and cycling stability of the lithium ion battery are remarkably improved.