273results about How to "Reduce interface impedance" patented technology

The invention provides a secondary battery and a preparation method and device thereof, and the secondary battery comprises a positive pole piece, a negative pole piece, a solid electrolyte, a first modification layer and a second modification layer. One of the first modification layer and the second modification layer is located between the positive pole piece and the solid electrolyte, and the other one of the first modification layer and the second modification layer is located between the negative pole piece and the solid electrolyte; the first modification layer and / or the second modification layer comprises 20 wt%-60 wt% of polymer, 10 wt%-65 wt% of lithium salt and 2 wt%-45 wt% of inorganic particles. The thickness of the first modification layer and / or the second modification layer is relatively thin, easy to control and relatively good in uniformity, so that the interface resistance between the positive pole piece and / or the negative pole piece in the secondary battery and the solid electrolyte is remarkably reduced, the side reaction between the solid electrolyte and the positive pole piece and / or the negative pole piece is avoided, and the service life of the secondary battery is prolonged. And the first modification layer and / or the second modification layer have / has good thermal stability, so that the cycle performance of the secondary battery can be improved.

The invention provides a high-performance all-solid-state sodium ion battery, and belongs to the technical field of power batteries, the sodium ion battery comprises a Prussian white positive electrode, a metal sodium negative electrode and an NASICON type solid electrolyte; preparation raw materials of the Prussian white positive electrode comprise Prussian white, the general formula of the Prussian white is NaxFe [Fe (CN) 6], and x is larger than or equal to 1.8 and smaller than 2.2; the composition of the NASICON type solid electrolyte is NaxZr2-yMySiuPvO12, x is more than 0 and less than or equal to 4, y is more than or equal to 0 and less than 2, u is more than 0 and v is less than 3; in the NaxZr2-yMySiuPvO12, M is at least one of a Zn element, a Mg element, a Cu element, an Al element, a Ni element, a Ga element, a Fe element and a K element. The sodium ion battery has excellent electrochemical performance at room temperature, is high in safety, and is beneficial to commercialized development and application of all-solid-state sodium ion batteries. The invention also provides a preparation method of the high-performance all-solid-state sodium ion battery.

The invention relates to a silicon-carbon composite material, a preparation method thereof and a lithium ion battery. The preparation method comprises the following steps: adding porous carbon into a fluidized bed, heating and introducing alkaline mixed gas to obtain amino porous carbon; transferring the amino porous carbon into fluidized bed equipment, vacuumizing, heating, and introducing hydroxyl silane gas for nano silicon deposition; after deposition, introducing ultraviolet light for polymerization and oxidation to obtain a modified silicon-carbon precursor material; transferring the modified silicon-carbon precursor material into a tubular furnace, introducing inert gas to discharge air in the tube, and performing first carbonization to obtain a silicon-carbon material; and adding the resin into an organic solvent, adding the fast ion conductor and the silicon carbon material to be uniformly dispersed, performing spray drying, and performing secondary carbonization to obtain the fast ion conductor coated silicon carbon composite material. The preparation method provided by the invention is simple and efficient, and the prepared silicon-carbon composite material can improve the fast charging performance and is suitable for a negative electrode material of a high-energy-density lithium ion battery.

The invention discloses a lithium ion battery negative electrode with low expansion and low impedance. The lithium ion battery negative electrode comprises a composite current collector and a negative electrode active material coating coated on at least one surface of the composite current collector, the negative electrode active material coating comprises a negative electrode active material, graphene and lithium polyacrylate; the mass ratio of the negative electrode active material to the graphene to the lithium polyacrylate is (90-99): (0.5-5): (0.5-5), the negative electrode active material comprises a silicon carbon material and a coating material layer arranged on the outer surface of the silicon carbon material, and the coating material layer comprises a polypyrrole layer and single-walled carbon nanotubes uniformly distributed in the polypyrrole layer. Compared with the prior art, the lithium ion battery negative electrode provided by the invention has the advantages of low expansion and low impedance, and can effectively inhibit the expansion of silicon particles, reduce the internal resistance of the battery and maintain the structural stability of the electrode.

The invention belongs to the field of solid electrolytes, and relates to an argyrodite type solid electrolyte and a preparation method and application thereof, the molecular formula is Li < 5.5-x > P < 1-x > W < x > S < 4.5-3x > O < 3x > ClyBr < 1.5-y >, during preparation, raw materials are premixed according to a molar ratio, and ball milling is performed to obtain solid electrolyte powder; and tabletting the solid electrolyte powder to obtain an electrolyte sheet, and sintering to obtain the argyrodite type solid electrolyte. According to the multifunctional electrolyte disclosed by the invention, the ionic conductivity is improved, and meanwhile, the stability to air is relatively good.

The invention relates to the field of lithium ion battery materials, and particularly discloses a composite positive electrode material as well as a preparation method and application thereof. The composite positive electrode material comprises a positive electrode active material and a coating material coated on the surface of the positive electrode active material, lithium iron phosphate is used as a basic raw material, and the positive electrode active material is prepared by doping rare earth elements and non-metallic elements; the surface of the positive active matter is coated with a layer of mixture which takes sulfide solid electrolyte, a conductive agent and lithium salt as raw materials, interface impedance is effectively reduced through element doping and surface coating, the interlayer spacing of the material is increased, and the diffusion rate of lithium ions is improved, so that the lithium ion battery also has good electrical properties in a wide temperature range. According to the technical scheme, the problems that in the prior art, the charging and discharging efficiency of a lithium battery is reduced in a high / low-temperature environment, the battery capacity is attenuated, and the cycle performance and the service life of the battery are affected are effectively solved.

The invention provides a silicon carbon material with a multilayer coating structure and a preparation method and application thereof, and relates to the technical field of battery materials. The silicon-carbon material with the multi-layer coating structure comprises a porous carbon core body, and a first carbon layer and a second carbon layer which sequentially coat the porous carbon core body from inside to outside, and the porous carbon core body comprises porous carbon and nano silicon particles deposited on the surface and in pore channels of the porous carbon; and a conductive nano carbon filler is dispersed in the second carbon layer. The silicon carbon material with the multilayer coating structure provided by the invention is used as a lithium ion battery negative electrode material, and has excellent specific capacity, coulombic efficiency and cycle performance. The result of the embodiment shows that when the silicon carbon material with the multi-layer coating structure is applied to the lithium ion battery, the first reversible capacity is 1882-2071 mAh / g, the first coulombic efficiency is 92.6-94.1%, and the capacity retention ratio of 100 cycles is 95.3-97.7%.

The invention relates to a 3D printing composite positive pole piece, a preparation method thereof and a solid-state battery, the 3D printing composite positive pole piece comprises 90-97wt% of a positive active material, 10-15wt% of a conductive agent, 10-15wt% of a binder, 10-15wt% of a plasticizer and 10-15wt% of a polymer monomer; the proportion of the conductive agent is 1 to 3.5 weight percent; the plasticizer accounts for 0 to 1.5 wt%; the binder accounts for 1 to 5 weight percent; the proportion of the polymer monomer is 1 to 5 weight percent. The method has the advantages that the raw materials are printed on the positive electrode current collector in a 3D printing mode, the printed electrode has high integration and high material utilization rate, compared with a coating mode, the battery manufacturing time and cost can be effectively reduced, monomers in the electrode and an electrolyte precursor solution are polymerized, the combination degree between the solid electrolyte and the electrode is improved, and the battery performance is improved. And electrode / solid electrolyte integration is realized, so that the interface impedance between the electrolyte and the electrode is reduced, the lithium ion interface transmission is accelerated, and the capacity exertion and rate capability of the positive electrode material are improved.

The invention provides a positive electrode material and a preparation method thereof, a positive electrode slurry, a positive electrode plate, a lithium ion battery and a preparation method thereof, the positive electrode material is applied to a battery, the battery comprises an electrolyte, the electrolyte comprises lithium hexafluorophosphate and an organic solvent, the positive electrode material comprises a positive electrode active substance and lithium carbonate, and the organic solvent comprises lithium hexafluorophosphate and lithium carbonate. The lithium carbonate is coated on the surface of the positive active material, and the mass ratio of the positive active material to the lithium carbonate is 1: (0.001-0.03). The surface of the positive active material is coated with a layer of lithium carbonate, the lithium carbonate can react with lithium hexafluorophosphate in electrolyte, and a lithium difluorophosphate coating layer is generated on the surface of the positive active material in situ, so that the addition amount of lithium difluorophosphate in the battery can be effectively increased, and the performance of the battery is improved.

The invention discloses a sulfide solid electrolyte based on ionic liquid electrowetting modification and application thereof. The preparation method of the electrolyte comprises the following steps: preparing a sulfide electrolyte into an electrolyte sheet, and coating the surface of the electrolyte sheet with an ionic liquid to form an ionic liquid film, thereby obtaining the electrolyte sheet containing the ionic liquid film; and placing the sulfide solid electrolyte between electrode plates which are arranged in parallel to assemble a parallel-plate capacitor, and applying a direct-current signal to carry out electrowetting treatment, thereby obtaining the sulfide solid electrolyte based on ionic liquid electrowetting. The specific ionic liquid is introduced into the interface of the sulfide solid electrolyte and the negative electrode for electrowetting treatment, so that the interface contact angle is effectively reduced, the interface wettability is improved, the interface impedance is reduced, the electrochemical performance of the all-solid-state battery is improved, and the cycle life of the all-solid-state battery is prolonged. The method particularly focuses on the use of imidazole and pyridine ionic liquids, and selects the appropriate ionic liquid for the lithium metal negative electrode material to realize the optimal interface modification effect.

The invention provides a preparation method for in-situ generation of an organic-inorganic hybrid SEI layer in a zinc ion battery, which is characterized in that a polysaccharide / polyacrylamide dual-network hydrogel electrolyte is used as an electrolyte of the zinc ion battery, and is further assembled with a positive pole piece and a negative pole piece to form the zinc ion battery. And the zinc ion battery generates an organic-inorganic hybrid SEI layer on the negative electrode in situ in the charge-discharge cycle process. The invention also provides an application of the organic-inorganic hybrid SEI layer in a zinc ion battery. By means of the technical scheme, the organic-inorganic hybrid SEI layer generated on the surface of the zinc negative electrode in situ can inhibit growth of zinc dendrites, induce zinc to be evenly deposited and prevent zinc foil corrosion, the capacity retention ratio and coulombic efficiency of the battery are almost 100% after 3000 cycles under the condition of 5A / g, and the battery shows excellent electrochemical stability.

The lithium ion secondary battery comprises a positive plate, a negative plate, electrolyte and a diaphragm, the negative plate comprises a negative current collector and a negative active layer arranged on the negative current collector, the negative active layer comprises a first active layer and a second active layer which are arranged on the surface of the negative current collector, and the second active layer is arranged on the surface, far away from the negative current collector, of the first active layer; the first active layer comprises a first negative electrode active material, and the first negative electrode active material comprises first graphite; the second active layer comprises a second negative electrode active material, and the second negative electrode active material comprises silicon carbon; the electrolyte comprises 1, 3, 6-hexane trinitrile, the mass content of the 1, 3, 6-hexane trinitrile in the electrolyte is 0.5 wt%-10wt%, and the battery provided by the invention has a relatively high cycle capacity retention ratio.

The invention relates to an all-solid-state battery cell with a three-dimensional staggered lithium ion conduction network as well as a preparation method and application of the all-solid-state battery cell. The method comprises the following steps: uniformly and electrostatically spraying positive electrode powder A, B and C with different particle sizes and compositions into a grinding tool in sequence; spraying a layer of sulfide electrolyte on the composite positive electrode layer; then uniformly and electrostatically spraying composite negative electrode powder D and E which are uniformly mixed and have different particle sizes and compositions on the surface of an electrolyte layer in sequence; and finally, integrally pressing the powder by adopting warm isostatic pressing to prepare an all-solid-state battery cell, and assembling the all-solid-state battery cell into a solid-state battery. The invention provides a brand new battery structure design, a three-dimensional staggered lithium ion conduction network is constructed by introducing a low-viscosity thermoplastic and an electrostatic dry spraying technology, the lithium ion migration efficiency is remarkably improved, and meanwhile, the interface stability between an electrode and a solid electrolyte is enhanced; therefore, the interface impedance of the sulfide solid-state battery is reduced so as to realize better capacity retention ratio, longer cycle life and better safety performance.

The invention provides an electron-ion mixed conductor solid electrolyte material as well as a preparation method and application thereof, and is characterized in that the electron-ion mixed conductor solid electrolyte material is compounded by embedding a sulfide solid electrolyte into a metal organic framework material serving as a framework, the electronic conductivity of the metal organic framework material is greater than 10 <-2 > S / cm. A metal organic framework material is used as a carrier of a sulfide solid electrolyte and is compounded with the sulfide solid electrolyte to form a mixed conductive ion-electron structure, and the mixed conductive ion-electron structure is fully mixed with a positive electrode active substance, so that the interface contact loss between the materials is favorably reduced, and the metal organic framework material can play a role of a conductive agent in the composite positive electrode; therefore, the use amount of the conductive agent in the composite positive electrode is reduced, and even the conductive agent is not needed, so that the use amount of auxiliary materials is reduced, the polarization of a battery cell is reduced, and the utilization rate of positive electrode active substances is improved.

The invention relates to the technical field of epidermal signal acquisition equipment, and provides an ionization-electricity double-layer structure epidermal electrode and a preparation method and application thereof.The ionization-electricity double-layer structure epidermal electrode comprises an electronic conducting layer, the electronic conducting layer is provided with a concave-convex first surface, an ion conducting layer is arranged on the first surface of the electronic conducting layer, and the ion conducting layer is arranged on the second surface of the electronic conducting layer. And a concave-convex ionization-electricity interface is formed between the electron conducting layer and the ion conducting layer. According to the ionization-electricity double-layer structure skin electrode, the ionization-electricity coupling efficiency is improved, the interface impedance is reduced, then the baseline noise level of electrophysiological signals is reduced, and high-fidelity electrophysiological signal collection is achieved.

The invention belongs to the field of electrochemical energy storage, and particularly relates to a water-based zinc ion battery electrolyte, a battery and a zinc negative electrode protection method of the battery, zinc negative electrode corrosion, hydrogen evolution reaction and dendritic crystal growth are effectively inhibited by regulating and controlling the electrolyte, changing a hydrogen bond network of the electrolyte and optimizing a zinc ion solvation structure, and the cycle life of the zinc negative electrode is prolonged. The solvent of the electrolyte is water, and the solute is zinc sulfate and shikimic acid. When the prepared electrolyte is used for assembling the zinc symmetric battery, the interface impedance is obviously reduced, the deposition morphology is optimized, the formation of dendritic crystals is inhibited, hydrogen evolution reaction and side reaction are inhibited, and the cycle life of a zinc negative electrode can be effectively prolonged.

The invention provides a polymer electrolyte. The polymer electrolyte comprises the following components in percentage by weight: 1 to 90 percent of cross-linked polymer, 0.01 to 50 percent of plastic crystal and 0.01 to 20 percent of lithium salt, the plastic crystal is selected from 1-azabicyclo [2.2. 2] octane and a derivative of 1-azabicyclo [2.2. 2] octane. The invention also provides a preparation method of the polymer electrolyte, a polymer solid-state battery and a preparation method of the polymer solid-state battery. According to the invention, the 1-azabicyclo [2.2. 2] octane and the derivative thereof are used as additives to be added into the polymer electrolyte, on one hand, the 1-azabicyclo [2.2. 2] octane and the derivative thereof can be homogenized with the polymer, so that the growth of lithium dendrites is inhibited, the safety performance of the polymer solid-state battery is greatly improved, and on the other hand, the side reaction between an active substance and an electrode can be reduced; and the short-circuit prevention performance of the battery is improved, so that the safety performance of the battery is further improved.

The invention relates to the field of lithium ion batteries, and discloses a lithium titanate composite material and a preparation method thereof, a negative pole piece and a preparation method thereof, a lithium battery and a battery pack. The surfaces of lithium titanate particles are sequentially coated with the nitrogen-doped carbon intermediate layer and the two-dimensional MXene material outer layer, and the MXene material outer layer is formed by bridging adjacent particles through hydrogen bonds, so that a'core-shell-bridge 'three-dimensional conductive network structure is constructed, the electronic conductivity of the lithium titanate composite material is remarkably improved, the electron / ion transmission efficiency of the lithium titanate negative electrode is improved, and the lithium titanate negative electrode has a good application prospect. The lithium ion battery has excellent rate capability and cycle performance; and through collaborative optimization of the three-dimensional composite material and the electrolyte, the interface impedance is reduced, and polarization is inhibited, so that the lithium battery still keeps high capacity and long cycle stability under ultrahigh rate, and meanwhile, the problems of discontinuous conductive network and high interface impedance in the prior art are solved. And excellent rate capability and cycle performance can be achieved under ultrahigh rate.

The invention provides an all-solid-state battery and application thereof. The all-solid-state battery comprises a positive pole piece and a negative pole piece, a protective layer is arranged on the surface of the lithium metal negative electrode; and the solid-state electrolyte membrane is arranged between the positive pole piece and the lithium metal negative pole, and the solid-state electrolyte membrane comprises sulfide solid-state electrolyte. According to the all-solid-state battery and the application thereof provided by the invention, the interface stability between the lithium metal negative electrode and the solid electrolyte can be enhanced, side reactions can be reduced, and the all-solid-state battery with long cycle performance can be obtained by combining the all-solid-state battery with the sulfide solid electrolyte provided by the invention.

The invention discloses a flame-retardant semi-solid electrolyte, a preparation method thereof and a sodium ion battery. The preparation method of the flame-retardant semi-solid electrolyte comprises the following steps: preparing a semi-solid electrolyte precursor solution under an argon protection condition; the semi-solid electrolyte precursor solution contains the following components in parts by weight: 20-60 parts of an organic solvent; 4 to 15 parts of sodium salt; 0.2 to 1 part of an initiator; 5-10 parts of a polymer monomer; wherein the polymer monomer is prepared from diethyl isopropenyl phosphate ester and triallyl isocyanurate; and heating to carry out in-situ polymerization on the semi-solid electrolyte precursor solution to obtain the flame-retardant semi-solid electrolyte. The semi-solid electrolyte and the sodium ion battery provided by the invention have excellent flame retardant property while having relatively good electrochemical performance.

The invention relates to the technical field of electrode materials, in particular to a composite silicon negative electrode material suitable for a sulfide-based all-solid-state battery and a preparation method and application thereof, and the preparation method comprises the following steps: (1) generating a metal organic framework material on the surface of a nano silicon material through an in-situ growth method; (2) carbonizing the metal organic framework material on the surface of the nano silicon material through calcination treatment to form a nitrogen-doped porous carbon material, so as to obtain a Si-NC material; and (3) generating a sulfide solid electrolyte on the surface of the Si-NC material through an in-situ growth method to obtain the Si-NC-SE composite silicon negative electrode material. According to the invention, the surface of the Si material is coated with the nitrogen-doped porous carbon material (NC) through an in-situ generation technology, and the sulfide solid electrolyte is generated in situ, so that the conductivity of the composite silicon negative electrode material and the cycling stability of the sulfide-based all-solid-state battery adopting the composite silicon negative electrode material are improved.

The invention provides a silicon-based negative electrode material with a cage-shaped structure, a preparation method of the silicon-based negative electrode material, a solid-state battery and electric equipment, and relates to the field of batteries. The silicon-based negative electrode material with the cage-shaped structure comprises an inner core, a polymer coating layer and a carbon coating layer, the polymer coating layer coats the inner core, and the carbon coating layer coats the polymer coating layer; the core comprises silicon particles, the polymer coating layer comprises a polymer, the polymer comprises one or more repetitive units, the repetitive units comprise siloxane units, and the repetitive units are crosslinked to form a cage-shaped structure. According to the silicon-based negative electrode material with the cage-shaped structure provided by the invention, by constructing the cage-shaped structure coating the surfaces of the silicon particles, structural damage caused by silicon volume change can be effectively inhibited, the contact stability between an electrode and a solid electrolyte is enhanced, and the interface impedance is reduced, so that the cycle performance and the energy density of a solid-state battery are remarkably improved.

The invention discloses a gel polymer electrolyte based on sulfuryl electrolyte and a preparation method and application thereof, and the preparation method comprises the following steps: S1, mixing a lithium salt with a sulfuryl organic solvent, and then adding a weak solvation solvent to obtain a basic electrolyte; s2, dissolving a monomer and a free radical initiator in the basic electrolyte to form a precursor solution; and S3, assembling the precursor solution in a battery, and heating at 60-80 DEG C for 4-24 hours to obtain the gel polymer electrolyte. The gel polymer electrolyte prepared by the invention presents a solvation structure which takes lithium salt anions as main components, which is contributed by the weak solvation ability of one of the solvents, and the generated inorganic interface-rich layer is beneficial to stabilizing the phase change of a high-voltage cathode and inhibiting the growth of metal lithium dendrites or the co-intercalation behavior of a graphite cathode at the same time; while good electrochemical stability of a sulfonyl electrolyte with good thermal stability and a high-nickel lithium metal battery system is considered, the construction mode of an anion-rich solvation structure is expanded.

The invention provides a three-dimensional composite solid electrolyte membrane, a preparation method thereof and an all-solid-state lithium metal battery. Comprising a homogeneous gel buffer layer, a porous middle layer and a polymer substrate layer which are stacked. In the three-dimensional composite solid electrolyte membrane, the homogeneous gel buffer layer has relatively high mechanical strength and elastic modulus, and can prevent lithium dendrites from puncturing the diaphragm to cause short circuit of the battery; the porous middle layer can increase the contact area between the film layers on the two sides and the electrode, more transmission channels are provided for lithium ions, transmission resistance is reduced, the ionic conductivity is improved, the battery can be charged and discharged more rapidly, the rate performance of the battery is improved, meanwhile, the excellent mechanical stability is achieved, and the cycle life of the battery is prolonged; the polymer substrate layer has excellent mechanical strength and interface stability. The three film layers cooperate to effectively inhibit chemical side reactions between the three-dimensional composite solid electrolyte film and the positive and negative electrodes, reduce the interface impedance and improve the overall electrochemical performance of the battery.

The invention provides a negative electrode material and a battery, the negative electrode material comprises secondary particles, the secondary particles comprise primary particles and amorphous carbon connected with the primary particles, and the primary particles comprise graphite; the negative electrode material comprises at least one of an N element and a P element; in the negative electrode material, the corresponding particle sphericity degree is S10 when the cumulative volume distribution percentage reaches 10%, the corresponding particle sphericity degree is S50 when the cumulative volume distribution percentage reaches 50%, the corresponding particle sphericity degree is S90 when the cumulative volume distribution percentage reaches 90%, S10 is larger than or equal to 0.75 and smaller than or equal to 0.85, S50 is larger than or equal to 0.85 and smaller than or equal to 0.9, and S90 is larger than or equal to 0.9 and smaller than or equal to 1.0. The negative electrode material provided by the invention is relatively good in particle sphericity degree, the isotropy of the negative electrode material can be improved, and the specific capacity and the fast charge rate performance of the negative electrode material can be improved.

The invention provides a PbZrO3 antiferroelectric capacitor and a preparation method thereof, and relates to the technical field of ferroelectric materials, the PbZrO3 antiferroelectric capacitor comprises a first electrode layer, a PbO layer, a solid solution ferroelectric antiferroelectric layer, a LaNiO3 layer and the like, and phases in the solid solution ferroelectric antiferroelectric layer comprise PbZrO3, a ferroelectric and an Ag-containing Au phase. The invention also provides a preparation method of the capacitor, and the method comprises the following steps: depositing a LaNiO3 precursor solution on a single crystal substrate, and carrying out the crystallization; mixing the PbZrO3 precursor solution with the ferroelectric precursor solution, and then adding Au nanoparticles containing Ag; the LaNiO3 layer is coated with the mixed solution, and crystallization is carried out; depositing the PbO precursor solution on the surface of the antiferroelectric layer of the solid solution ferroelectric, and crystallizing; and carrying out gold electrode deposition to obtain the PbZrO3 antiferroelectric capacitor. The capacitor is high in energy storage efficiency and high in dielectric constant.

The invention relates to a negative electrode material and a preparation method thereof, a negative electrode plate, a battery and an electronic device. The preparation method of the negative electrode material comprises the following steps: dissolving a hard carbon precursor in a first solvent, and carrying out a hydrothermal reaction to obtain an intermediate A; performing heat treatment and acid pickling on the obtained intermediate A in a first protective gas atmosphere to obtain a hard carbon material; and adding 2, 2-dimethyl vinyl boric acid into a second solvent, stirring for the first time, adding the obtained hard carbon material, stirring for the second time, and baking to obtain the negative electrode material. The negative electrode material prepared by the preparation method disclosed by the invention has a stable and compact artificial solid electrolyte interface (SEI) membrane, the irreversible capacity of the material can be remarkably reduced, and the first coulombic efficiency and the capacity retention ratio of the battery are improved.

The invention relates to an S-doped g-C3N4 coated modified graphite material, a preparation method thereof and a lithium ion battery negative electrode. The method comprises the following steps: mixing a g-C3N4 precursor with a sulfur source, and then carrying out heat treatment under the condition of shielding gas to obtain sulfur-doped graphite phase carbon nitride S-g-C3N4; carrying out plasma modification treatment on the surface of the graphite material by adopting plasma reaction gas to obtain modified graphite; mixing S-g-C3N4 with the modified graphite to obtain a mixed material; and calcining the mixed material in a protective gas environment to obtain the S-doped g-C3N4 coated modified graphite material. The invention also provides the graphite material prepared by the method and a lithium ion battery negative electrode prepared from the graphite material. The graphite material has relatively high conductivity, interface compatibility and structural stability.

The invention belongs to the technical field of positive electrode materials, and particularly relates to an O < 3 >-O < 2 > composite phase ternary positive electrode material and a preparation method and application thereof. The preparation method comprises the following steps: S1, mixing a ternary positive electrode material precursor, a first lithium source and a dopant, and carrying out first sintering to obtain a matrix; s2, mixing the matrix, a sodium source and a cobalt source, and carrying out second sintering to obtain an O3 (at) P2 composite phase material; s3, mixing the O3-coated P2 composite phase material and a second lithium source, and carrying out ion exchange reaction; and S4, mixing the ion exchange product and a coating agent, and carrying out third sintering to obtain the O3 and O2 composite phase ternary positive electrode material, according to the invention, doping, phase transformation and coating have a synergistic effect, and a battery containing the ternary positive electrode material prepared by the invention has excellent specific capacity, coulombic efficiency, cycle performance and rate capability.

The invention relates to a slurry prepared from a sulfide electrolyte, a cosolvent, a binder and a lithium salt and a manufacturing method for simultaneously applying the slurry to a solid-state battery. The invention mainly aims to provide all-solid-state battery slurry with high ion transmission and low interface impedance. In the patent, the following slurry is provided to solve the problem: the cosolvent-binder slurry with good compatibility with the sulfide electrolyte, the cosolvent contains a first solvent and a second solvent, the first solvent is a non-polar or weakly polar solvent, and the second solvent is a polar solvent with large steric hindrance; the adhesive is a rubber type adhesive; and the lithium salt is an organic lithium salt.