72results about How to "Improve the first Coulombic efficiency" patented technology

The invention belongs to the technical field of batteries, and particularly relates to a negative plate and a preparation method and application thereof. The negative electrode plate comprises a negative electrode current collector and a negative electrode material layer arranged on at least one side surface of the negative electrode current collector, the negative electrode material layer comprises a negative electrode active substance, a negative electrode conductive agent and a composite binder, and the composite binder comprises carboxymethyl cellulose lithium and siloxane. The negative electrode plate has relatively high stripping force or crack resistance, and the first coulombic efficiency or cycle stability of the battery can be effectively improved when the negative electrode plate is applied to the battery.

The invention relates to a uniform carbon-coated mesoporous silicon carbon negative electrode material and a preparation method and application thereof.The preparation method comprises the steps that a product obtained after pyrolysis and carbonization of a biomass carbon source is subjected to alkali activation treatment, acid pickling, drying, smashing, passivation, water washing and drying are conducted to obtain a mesoporous carbon matrix, nanometer silicon particles are deposited in pores of the mesoporous carbon matrix, and the uniform carbon-coated mesoporous silicon carbon negative electrode material is obtained. Then selecting a low-temperature carbonization material and polyethylene glycol to perform pre-carbonization and complete carbonization treatment on the mesoporous silicon carbon material to obtain a carbon coating layer, and finally obtaining the uniform carbon-coated mesoporous silicon carbon negative electrode material. When the uniform carbon-coated mesoporous silicon carbon negative electrode material is applied to a lithium battery, the mesoporous skeleton can effectively inhibit volume expansion of silicon in a battery circulation process, and the uniform carbon-coated layer can effectively reduce the risk of direct contact between the negative electrode material and an electrolyte, so that a stable SE I film is formed to reduce the occurrence of side reactions; and the first coulombic efficiency and the cycle performance of the battery are further improved.

The invention provides a silicon-carbon composite negative electrode material, a preparation method of the silicon-carbon composite negative electrode material, a lithium ion battery negative electrode plate containing the silicon-carbon composite negative electrode material and a lithium ion battery, and relates to the technical field of lithium ion batteries. The silicon-carbon composite negative electrode material comprises a porous carbon skeleton, silicon distributed in internal pores of the porous carbon skeleton, and a functional interface layer covering the outer surface of the skeleton, wherein no free silicon elementary substance exists on the outer surface of the porous carbon skeleton, and the functional interface layer comprises a metal fluoride passivation layer formed by reacting metal elements doped in the carbon skeleton with a fluorine-containing etching agent; and the hybrid electrolyte coating layer is formed by reacting an oxygen-containing or nitrogen-containing functional group grafted on the surface of the carbon skeleton with a fluorine-containing etching agent. According to the technical scheme, the stable interface layer with passivation protection and ion conduction functions can be constructed in situ while high-activity silicon on the surface is removed, so that the first coulombic efficiency, the cycling stability and the rate capability of the battery are remarkably improved, side reactions are reduced, and the safety of the battery is improved.

The invention provides a lithium metal negative electrode protection layer, a preparation method and application thereof, and a lithium metal battery, and relates to the technical field of lithium metal batteries, the protection layer is formed on the surface of a metal lithium foil, and comprises a polymer and an inorganic substance; the polymer comprises polyvinylidene fluoride-hexafluoropropylene; the inorganic substance includes lithium phosphate. The components of the protective layer cooperate with each other, so that lithium dendrites can be physically inhibited, the first discharge specific capacity, the first coulombic efficiency and the cycle performance can be effectively improved, gas can be actively consumed, and the cycle stability and the safety performance of the lithium metal battery can be cooperatively improved from multiple dimensions; the technical problems that an existing protective layer cannot actively eliminate gas, the lithium dendrite inhibiting effect is poor, and the interface stability is poor are solved.

The invention provides a carbonaceous material and a preparation method thereof, and a negative pole piece, a secondary battery and an electric device containing the carbonaceous material, after the carbonaceous material is subjected to an adsorption test for 100 hours by adopting water vapor under the conditions of 25 DEG C and 100% RH constant temperature and humidity, the adsorption mass of the water vapor is recorded as A, the initial mass of the carbonaceous material is recorded as B, and A / B is greater than or equal to 0.13 and less than or equal to 0.50. The capacity and the first coulombic efficiency of the carbonaceous material can be improved at the same time.

The application discloses a preparation method of a sodium ion battery hard carbon negative electrode material based on step-by-step synergistic regulation, and comprises the following steps: S1, biomass pretreatment; S2, low-temperature pre-carbonization to obtain biomass pre-carbonized carbon; S3, physical activation: the pre-carbonized carbon is placed in an activation atmosphere to perform medium-temperature activation, and biomass activated carbon is obtained; S4, high-temperature carbonization: the biomass activated carbon is placed in an inert atmosphere to perform high-temperature carbonization, and a hard carbon intermediate is obtained; S5, chemical vapor deposition coating: the hard carbon intermediate is placed in a mixed atmosphere of a coating carbon source and an inert gas to perform chemical vapor deposition coating, and a surface-coated biomass hard carbon negative electrode material is obtained. The application can realize a higher closed pore volume at a milder temperature, and the synergistic regulation pore forming mode of activating and forming pores first and then high-temperature closing pores also avoids the insufficient closed pores caused by single high-temperature treatment.

This invention belongs to the technical field of lithium battery anode materials, specifically relating to a highly conductive graphite electrode material and its preparation method. The preparation method includes: pre-dissolving sodium carboxymethyl cellulose into a gel solution, then ball-milling and mixing graphite and conductive carbon black, dispersing them together with a cobalt hexacyanorubium(II)-dodecyltungstencobalt(III) salt hybrid material and hafnium diboride nanomaterials in the gel solution, adjusting the acidity, adding styrene-butadiene rubber emulsion to obtain a uniform slurry, and then coating, drying, and compacting to obtain the anode sheet. This invention significantly improves the conductivity and structural stability of the graphite anode through the synergistic effect of the interface modification of the cobalt hexacyanorubium(II)-dodecyltungstencobalt(III) salt hybrid material and the conductive framework of the hafnium diboride nanomaterials. The process is safe and controllable, and suitable for industrial production of lithium-ion batteries.

This invention belongs to the field of hard carbon technology, specifically relating to a bamboo-based and lignin-based hard carbon composite material, its preparation method, and its applications. The process involves pretreating raw materials to obtain pretreated material; pretreating the pretreated material with an acidic oxidant to obtain acidic oxidant pretreated material; pre-oxidizing the acidic oxidant pretreated material to obtain pre-oxidized material; pre-carbonizing the pre-oxidized material under a protective atmosphere to obtain pre-carbonized material; pulverizing the pre-carbonized material to obtain pulverized material; acid washing followed by water washing to obtain purified material; soaking the purified material in acid, filtering, and drying to obtain soaked material; mixing the soaked material with a modifier, and high-temperature coating and carbonizing under a protective atmosphere to obtain bamboo-based coated hard carbon or lignin-based coated hard carbon. Mixing the two types of hard carbon and carbon coating yields a bamboo-based and lignin-based hard carbon composite material, which is used in negative electrode sheets and batteries. When applied to batteries, the hard carbon composite material of this invention can improve battery energy density.

The application discloses a preparation method of nitrogen-doped carbon-silicon nanofibers and application of the nitrogen-doped carbon-silicon nanofibers in a lithium ion battery negative electrode material, and belongs to the technical field of lithium ion battery negative electrode materials. The method comprises the following steps: mixing silicon nanoparticles and a carbon source, performing electrostatic spinning, stabilization treatment and carbonization treatment, and obtaining carbon-silicon nanofibers; and then mixing the carbon-silicon nanofibers with a nitrogen source, performing heat treatment under an inert atmosphere, making nitrogen elements doped into a carbon skeleton, and obtaining nitrogen-doped carbon-silicon nanofibers. The material obtained by the application is a one-dimensional nanofiber structure, silicon particles are uniformly wrapped in carbon fibers, and nitrogen elements are uniformly distributed in the carbon skeleton. The method can realize uniform nitrogen doping while maintaining the microstructure of the material, and significantly improves the electronic conductivity and interface stability of the material. The material obtained by the application is used as a lithium ion battery negative electrode, and exhibits high reversible capacity and excellent cycle stability.

The present application provides a negative electrode active material (100), a secondary battery comprising the same and an electrical device, wherein the negative electrode active material (100) comprises a matrix material and a silicon-based material, the matrix material comprises a plurality of pore structures, at least a part of the silicon-based material is located in pore structures of the matrix material, the silicon-based material comprises a crystalline silicon-based material, a region formed by extending from outer surface of particle of the negative electrode active material (100) to inside of the particle by a distance of 0.5 times a length between any point on the outer surface of the particle of the negative electrode active material (100) and a core of particle (O) is recorded as an outer region (101), and a region inside the outer region (101) is recorded as an inner region (102), and in cross-sectional image of the negative electrode active material (100), total cross-sectional area of the crystalline silicon-based material in the outer region (101) is smaller than total cross-sectional area of the crystalline silicon-based material in the inner region (102). The secondary battery provided by the present application can have high energy density, high First Coulombic Efficiency, long cycle life and long storage life at the same time.

This invention discloses a polymer coating material and its preparation method, as well as its application in artificial graphite anode materials. The polymer is synthesized from monomers, comonomers, and reaction auxiliaries under the action of an initiator. By controlling the amount of reaction auxiliaries added, the molecular weight of the polymer is controllable, and the side functional groups are adjustable. This polymer can uniformly coat the surface of artificial graphite, forming an artificial solid-state electrolyte interface, optimizing the lithium-ion transport path, and constructing a stable protective layer for the artificial graphite anode material. It can effectively improve the initial coulombic efficiency of the artificial graphite anode material, achieving an initial coulombic efficiency ≥91.8%.

This invention provides a composite lithium-ion battery anode material, its preparation method, and a lithium-ion battery anode, belonging to the technical field of battery anode materials. The composite lithium-ion battery anode material provided by this invention comprises a SiOC matrix and Sn atoms doped into the SiOC matrix; the mass of the Sn atoms is 1-10% of the total mass of the composite lithium-ion battery anode material. The microstructure of the composite lithium-ion battery anode material provided by this invention is a cross-linked, multi-level spherical morphology, and EDS surface scan shows that Si, O, C, and Sn elements are uniformly dispersed, with no Sn nanoparticles appearing. When the composite lithium-ion battery anode material provided by this invention is used in a lithium-ion battery, electrochemical performance testing shows an initial coulombic efficiency as high as 88%, and good rate performance and cycle stability. At a current density of 2 A / g, the specific capacity reaches 850 mA / g, and it can stably cycle 1000 times at a current density of 1 A / g.

This invention discloses a silicon-carbon composite anode material, its preparation method, and its applications. The preparation method includes: preparing a nitrogen-doped porous carbon framework from a carbon source, a nitrogen source, a pore-forming agent, and a soft template agent; surface-modifying the nitrogen-doped porous carbon framework with a silane coupling agent; subjecting the surface-modified nitrogen-doped porous carbon framework to chemical vapor deposition to obtain a silicon-carbon composite intermediate; and carbon-coating the silicon-carbon composite intermediate to form the silicon-carbon composite anode material. This invention improves the interfacial bonding strength between silicon and the carbon framework through chemical anchoring, and provides sufficient buffer space for silicon volume expansion through the synergistic pore-forming effect of the pore-forming agent and the soft template agent, thereby improving cycle stability. All steps are conventional chemical unit operations, and the raw materials used are all industrial-grade chemicals. The equipment requirements are low, and it is easy to scale up production.

The embodiment of the present application relates to a kind of porous silicon-carbon composite material and its preparation method and application, the porous silicon-carbon composite material includes: porous silicon-carbon matrix, including as porous carbon matrix of porous carbon skeleton and the nano-silicon layer deposited on the outer surface and internal pore wall of porous carbon skeleton;Nano-fiber mesh passivation layer is the three-dimensional mesh structure that inorganic nano-fiber interweaves and overlaps each other;Nano-fiber mesh passivation layer is coated on the outer surface of porous silicon-carbon matrix, and / or in the internal pore of porous silicon-carbon matrix, to form passivation protection to nano-silicon layer;Carbon coating layer, coated on the outer surface of porous silicon-carbon matrix;Wherein, carbon coating layer at the outer surface of porous silicon-carbon matrix constitutes the outermost layer of porous silicon-carbon composite material.The porous silicon-carbon composite material is applied to lithium ion battery negative electrode, with the characteristics of high initial coulomb efficiency, low expansion rate.

The application provides a sodium ion battery and a preparation method thereof, the sodium ion battery comprising a positive electrode sheet and a negative electrode sheet, a positive electrode material of the positive electrode sheet being a host material with a sodium intercalation structure, and a negative electrode material of the negative electrode sheet comprising a pre-sodium carbon material and / or metallic sodium, the application solves many limitations such as positive electrode material design and electrode design, greatly widens the selection range of the positive electrode material of the sodium ion battery, improves the energy density bottleneck, meanwhile, the problem that an olivine-type polyanion iron / manganese sodium salt with an electrochemical stable phase is difficult to prepare is avoided, and the first coulomb efficiency and the energy density of the sodium ion battery are improved.

The invention relates to the technical field of batteries, in particular to a negative electrode material preparation method based on a negative electrode aged hard carbon material, which comprises the following steps: firstly, crushing and grading an aged hard carbon precursor to obtain particles with a preset particle size; the preparation method comprises the following steps: performing pretreatment such as acid washing, alkali washing, water washing and ethanol washing, mixing a purified precursor with a coating material in proportion to form a uniform coating layer, pre-sintering in a protective atmosphere, and preliminarily stabilizing a material structure by controlling parameters such as a heating rate; and carrying out specific surface area detection on the pre-sintered primary product, and dynamically adjusting pre-sintering process parameters according to the specific surface area detection to ensure that the pore structure of the material reaches the standard. And performing high-temperature carbonization treatment on the material meeting the standard so as to repair the carbon layer structure and improve the conductivity. And finally, performing quality judgment by detecting the first coulombic efficiency of a finished product. According to the invention, the first coulombic efficiency, the specific capacity and the cycling stability of the regenerated hard carbon material are improved, and the recycling of the aging material is realized.

The invention belongs to the technical field of hard carbon materials, and particularly relates to a preparation method and application of a polyurethane-based hard carbon material. The preparation method comprises the following steps: carrying out roasting carbonization and post-treatment on a solid polyurethane material at 900-1400 DEG C to obtain a powdery polyurethane-based hard carbon material; the solid polyurethane material is a polyurethane product prepared from reaction raw materials including isocyanate, non-phosphorus-containing polyol and phosphorus-containing polyol through a reaction. According to the invention, the polyurethane material is prepared by adding the phosphorus-containing polyol, and the polyurethane material is applied to the field of batteries as a negative electrode raw material, so that high carbonization yield can be maintained, and excellent performances such as initial coulombic efficiency, energy density, cycle capacity retention rate and the like of the battery can be realized.

The present application relates to the technical field of low-temperature negative electrode material preparation of lithium ion batteries, and particularly relates to a silicon-silver-indium ternary alloy thin film negative electrode material for lithium ion batteries and a preparation method thereof, the material comprises 40 at% to 99 at% of silicon, 0.1 at% to 30 at% of silver and 0.1 at% to 30 at% of indium in terms of atomic percentage. The preparation method comprises a melting metallurgy rolling process or a magnetron sputtering deposition process. In the ternary alloy system, the silver improves the electronic conductivity, the indium optimizes the lithium ion diffusion kinetics and the interface stability, and the synergistic effect of the two makes the material exhibit high capacity, high initial efficiency and good rate performance at normal temperature and low temperature. The material system has good compatibility with the above two differentiated preparation processes, and provides a solution for the large-scale and precision application of high-performance silicon-based thin film negative electrodes.

This invention relates to the field of battery technology, and in particular to a modified negative electrode, a full cell, and a preparation method thereof. The modified negative electrode includes a negative electrode and a ceramic layer coated on the surface of the negative electrode; the ceramic layer includes a fast ion conductor, ceramic particles, and a binder. The ceramic layer of this invention employs a composition of a fast ion conductor, hollow ceramic particles, and a binder. The hollow ceramic particles provide mechanical strength and buffer space, the fast ion conductor provides an ultrafast lithium-ion transport channel, and the composite ceramic layer, incorporating the fast ion conductor and ceramic particles, provides the core requirements for stable mechanical support, stress buffering, and ion conduction at the silicon-doped negative electrode interface. This significantly improves the effectiveness of reducing interface wrinkles on the negative electrode sheet after formation, maintaining the integrity of the electrode structure between the coating and the current collector, and the active material particles.

The invention relates to a modified graphite negative electrode material and a preparation method thereof, a negative electrode and a lithium ion battery. The modified graphite negative electrode material comprises graphite particles and an SEI precursor layer which is uniformly coated on the surface of each graphite particle and is constructed by lithium salt, wherein the lithium salt is of a crystalline state structure, and the thickness of the SEI precursor layer is 1-500 nm; during the first charging and discharging process of the battery, the lithium salt of the SEI precursor layer is subjected to electrochemical reaction prior to electrolyte, and an inorganic phase SEI with LiF and / or Li3PO4 as a main component is formed on the surface of graphite particles in situ. The negative electrode material disclosed by the invention realizes active formation and uniform distribution of SEI, even in a thick electrode, a continuous SEI layer can be formed on the surface of a deep graphite particle in the first charge-discharge and cycle process of a battery, the first-cycle coulombic efficiency is remarkably improved, the cycle life is remarkably prolonged, and the low-temperature and rate performance is improved; in addition, the electrolyte can more easily infiltrate the electrode, so that Li < + > is more smoothly transmitted in the thick electrode, and the electrochemical performance of the electrode is improved.

The invention provides a method for preparing a sodium-ion battery hard carbon negative electrode with a high cross-linked structure based on cooperative cross-linking of hydroxyl enriched lignin and oxidized asphalt, and belongs to the technical field of preparation of sodium-ion battery negative electrode materials. The high-performance hard carbon negative electrode can be prepared without a solvent and an additional additive by optimizing a lignin pretreatment process and an asphalt pre-oxidation process and improving an asphalt-lignin cross-linking mode; by adopting the biomass derivative and petroleum asphalt composite carbon source, the method has the advantages of low cost, environmental protection and accessible raw materials; the sodium ion battery with the obtained hard carbon negative electrode has excellent electrochemical performance and is suitable for large-scale production of the sodium ion battery; and the practicability is high.

The application provides a high-capacity and high-rate hard carbon negative electrode material and a preparation method and application thereof, and belongs to the technical field of sodium ion battery negative electrode materials. Specifically, biomass shell raw materials are coarsely broken and sieved to obtain biomass coarse powder; the biomass coarse powder is mixed with an oxidizing agent and then pre-oxidized; mechanical pulverization is performed to obtain biomass coarse powder with a D50 of 8-15 microns; the biomass coarse powder is added into mixed acid and heated in a water bath, and then washed with water until neutral to obtain a purified precursor; and finally, the precursor is subjected to staged high-temperature carbonization in a vacuum carbonization furnace. Through specific process parameters, the prepared hard carbon material has a hierarchical porous structure and a suitable graphite microcrystalline layer spacing, and has a low total content of metal impurities; when applied to a sodium ion battery negative electrode, the hard carbon material exhibits a high reversible specific capacity, a high initial coulombic efficiency, and excellent long cycle stability and rate performance.

A chemical pre-lithiation method for improving the initial coulombic efficiency of carbon-based current collectors and its application in lithium metal batteries is disclosed. The method uses a carbonized cellulose film as the current collector, which is obtained by dropwise addition of an active lithium solution under an argon atmosphere until the solution reacts fully. This invention uses 4,4'-dimethylbiphenyllithium as the active lithium species and diphenyl ether and 2-methyltetrahydrofuran as a mixed solvent. By using a high-temperature carbonized cellulose film as the current collector, it is possible to achieve a better promoting effect on the active lithium species while increasing the initial coulombic efficiency to over 100%, greatly compensating for the irreversible capacity loss in the early cycling stages of carbon-based current collectors.

This invention relates to a method for preparing spatially selectively modified porous carbon, comprising the following steps: (S1) a sulfonate-based aromatic azo dye is dissolved in a mixed solvent of water and a polar aprotic organic solvent, and a soluble lithium source is added to carry out an ion exchange reaction to obtain a lithium-ionized dye; (S2) the lithium-ionized dye is dissolved in a mixed solvent of water and a polar aprotic organic solvent to form a solution, and porous carbon is added for impregnation treatment, controlling the impregnation conditions to ensure that the loading of the lithium-ionized dye is 2-4 wt%, thereby obtaining composite porous carbon; (S3) the composite porous carbon is heat-treated under an inert atmosphere to obtain spatially selectively modified porous carbon. This invention, by introducing a lithium-ionized dye, constructs a nitrogen / sulfur / lithium co-modified functional interface layer in situ on the outer layer and main pore region of porous carbon, achieving active control of the key interfaces of the silicon-carbon anode, significantly improving its cycle stability and interface reliability.

The invention relates to the technical field of electrochemical materials, in particular to a pre-sodium hard carbon material and a preparation method and application thereof. The pre-sodium modification method for preparing the pre-sodium modification hard carbon material comprises the following steps: (1) mixing a carbon source, amino acid and phosphoric acid, and carrying out pre-carbonization reaction to obtain a doped carbon source; (2) providing dispersion liquid containing the doped carbon source, a surfactant and weak base, and introducing organic sodium salt to carry out sodium pre-modification reaction to obtain a hard carbon precursor; and (3) carrying out carbonization reaction on the hard carbon precursor to obtain the pre-sodium hard carbon material. The pre-sodium treatment method is simple to operate and high in safety, the obtained pre-sodium treatment hard carbon material is excellent in performance, and the problems that a sodium ion battery is low in energy density and poor in cycle performance can be effectively solved.

The present disclosure relates to a kind of porous carbon material and its preparation method, silicon-carbon composite negative material and application.The preparation method includes the following steps: (1) organic matter precursor is dispersed in solvent, then mixed with alkali source and crosslinking agent, drying, obtain pre-treatment product;(2) pre-treatment product is activated and carbonized, to obtain the porous carbon material.In the preparation method provided in the present disclosure, by pre-treatment and subsequent activation and carbonization, on the one hand, the content of oxygen in the product can be controlled, on the other hand, the state of oxygen in the surface functional groups of the product can also be adjusted, so that a large number of uniform deposition layers can be formed during the deposition of elemental silicon on the surface of the porous carbon material;And the production of silicon oxide and silicon carbide can be effectively controlled, so as to improve the silicon-carbon composite negative material formed has initial coulomb efficiency, capacity, cycle performance stability.

This invention provides a method for preparing olivine-type sodium iron phosphate, olivine-type sodium iron phosphate, and a sodium-ion battery, specifically relating to the field of sodium-ion secondary battery technology. The preparation method involves dissolving sodium propionate and sodium salt, adding olivine-type iron phosphate, and grinding to obtain a precursor slurry. The precursor slurry is then spray-dried and sintered at 200-400°C to obtain the olivine-type sodium iron phosphate. In this preparation method, sodium propionate not only serves as a sodium source, but propionate ions also promote the kinetics of the solid-phase reaction, resulting in purer olivine-type sodium iron phosphate and further improved capacity. Furthermore, to reduce the high ineffective carbon content caused by the difficulty in propionate decomposition at low temperatures, an appropriate metal oxide precursor is introduced to facilitate the effective decomposition of carbonaceous species during pyrolysis, providing a feasible path for the low-cost, large-scale preparation of high-performance NaFePO4 materials.

This invention discloses a composite cathode material for lithium-ion batteries and its preparation method, belonging to the field of lithium-ion battery technology. The chemical formula of the composite cathode material is A. 1₋δ B δ 0

This application provides an anode material for solid-state batteries, a method for preparing the same, and a solid-state battery, relating to the field of solid-state batteries. The anode material includes secondary particles, which are spherical in shape and formed by stacking multiple primary particles. The primary particles include graphite and a coating layer distributed on at least a portion of the graphite surface. The coating layer is made of at least one of titanium dioxide, alumina, lithium niobate, lithium zirconate, lithium fluoride, silicon, and tin. The anode material of this application, comprising graphite and a coating layer on the graphite surface, effectively physically isolates the graphite from the contact with the sulfide solid electrolyte, significantly suppressing side reactions at the interface and effectively improving the first-cycle coulombic efficiency and cycle stability of the anode material.

The invention relates to the technical field of sodium ion battery material preparation, in particular to a high-performance hard carbon negative electrode material and a preparation method and application thereof.The preparation method comprises the following steps that S1, porous carbon and liquid asphalt are mixed, a binder, a conductive agent and a dispersing agent are added, and an active substance is obtained; and S2, performing ball milling on the active substance, coating the surface of a copper foil with the active substance, drying, covering the surface of the active substance with a layer of copper foil to form a copper foil-active substance-copper foil structure, and performing high-temperature calcination to obtain the high-performance hard carbon negative electrode material. The hard carbon negative electrode material prepared by the method shows relatively high reversible capacity and first coulombic efficiency in the sodium-ion battery, has good cycling stability, and is beneficial to large-scale production of the sodium-ion battery negative electrode material.