456 results about "Cell material" patented technology

The application provides a negative electrode material and a preparation method thereof and a secondary battery, and relates to the technical field of battery materials. The negative electrode material comprises a silicon-based inner core and a carbon layer coated on the surface of the silicon-based inner core, wherein the silicon-based inner core comprises nanosilicon and a silicate containing a metal element M; the negative electrode material is subjected to section analysis and energy spectrum analysis, and meets the conditions of k1<=10, k2<=5 and 0.1 The preparation method of the negative electrode material comprises the following steps: heating and evaporating pre-disproportionated silicon monoxide material and M metal source material to obtain silicon monoxide gas and metal source gas; mixing and condensing the two kinds of gas to obtain an inner core material; and performing carbon coating treatment to obtain the negative electrode material. In the negative electrode material prepared by the application, the metal silicate effectively separates the nanosilicon domain and the silicon oxide domain, and is uniformly distributed, and the negative electrode material has high initial efficiency and excellent cycle performance.

The invention discloses a polymer electrolyte composite material for a high-temperature-resistant solid-state battery and a preparation method of the polymer electrolyte composite material, and belongs to the technical field of solid-state battery materials. The preparation method comprises the following steps: preparation of key functional components, preparation of a precursor solution, dispersion and compounding of the filler, film casting and heat treatment, and post-treatment. A dynamic thioether bond is introduced into a main chain to construct an oxygen-sulfur synergistic coordination network, and a multi-component interface chemical bonding and gradient curing process is combined, so that the problems that the ionic conductivity and the mechanical strength of the traditional polymer electrolyte cannot be considered at a high temperature, the filler is easy to agglomerate, the membrane has many defects and the like are solved; the obtained material still keeps high ionic conductivity and excellent mechanical stability at 150 DEG C, has a wide electrochemical window, and is suitable for high-safety and high-energy-density solid-state batteries.

The invention relates to the field of battery materials, in particular to a binder material, a preparation method, a positive electrode material and a battery. The preparation method provided by the invention comprises the following steps: mixing and grinding a raw material compound and an additive into mixed powder; heating the mixed powder to a melting temperature in a protective gas atmosphere and carrying out a reaction to obtain a molten mass; the molten mass is cooled based on the rapid quenching technology, a nanocrystalline area and an amorphous area are formed in the molten mass cooling process, and a composite structure thin strip is obtained after cooling; forming a lithium-rich layer on at least part of the surface of the composite structure particle; providing a carbon source, mixing the composite structure particles forming the lithium-rich layer with the carbon source, and then carrying out heating treatment to form a carbon layer wrapping the surfaces of the composite structure particles and the lithium-rich layer; and epitaxially growing a carbon nanotube layer on the outer surface of the carbon layer, and obtaining the binder material after the epitaxial growth is completed. A novel binder material which has good ion / electron conductivity, mechanical properties adapting to volume change and suitable processing characteristics is found.

The invention provides a reverse generation type design method and system of a battery material based on a large language model. The method comprises the following steps: carrying out serialized representation on a crystal structure of a lithium ion battery material; constructing a material basic model, and training the material basic model based on the serialized representation result to obtain a trained material basic model; a multi-dimensional attribute virtual KV attention mechanism is introduced into the material basic model, and a property conditional generation model is obtained; accessing a property prediction head network to the material basic model, and performing supervised training on the material basic model to obtain a material property prediction model; and performing reinforcement learning training on the property conditional generation model to obtain an optimized property conditional generation model, and generating a crystal structure candidate set based on the optimized property conditional generation model. By means of the method, efficient, controllable and diversified generation of the hundred-atomic-scale complex crystal structure is achieved, and the precision and practicability of material reverse design are remarkably improved.

The invention discloses a porous carbon material, a preparation method thereof and a silicon-carbon composite material, and relates to the technical field of battery materials. The method disclosed by the invention is simple in process and suitable for large-scale industrial production, the prepared porous carbon material has optimized pore size distribution and pore structure, more silane adsorption sites and stronger adsorption capacity, can accommodate more silicon and has excellent conductivity, and when the porous carbon material is used for preparing a silicon-carbon composite material, the silicon-carbon composite material can be used for preparing the silicon-carbon composite material. And the capacity, the charge-discharge efficiency, the rate capability and the cycle performance of the battery can be effectively improved.

The invention discloses a composite pole piece as well as a preparation method and application thereof, and belongs to the technical field of battery materials. The composite pole piece comprises a current collector, an active material layer is arranged on the surface of the current collector, and a low-voltage platform active area and a high-voltage platform active area are arranged in the active material layer at the same time; a micro-crystal lattice formed by a functional additive is arranged between the low-voltage platform active region and the current collector; the functional additive comprises an electric polymer. The low-voltage platform active area and the high-voltage platform active area are arranged on the same current collector, so that the advantages of different active materials can be concentrated on the same pole piece, and the performance advantages of the active materials can be fully exerted; when the battery is in an overcharge environment, the micro-crystal dot matrix arranged in the composite pole piece can directly absorb, consume and convert overcharge current on the current collector, and quickly responds to and participates in overcharge protection of the material. The battery with the composite pole piece can have relatively high battery energy density and rate capability, relatively long cycle life and relatively good safety.

The invention belongs to the field of new energy NCM ternary precursors, and particularly relates to a preparation method of a doped and (or) coated ternary precursor. A continuous and intermittent dynamic switching process is created for the first time, main particles are generated through continuous reaction, and after the particle size reaches a preset value, an intermittent process mode is selectively switched for precise coating; the double reaction kettles are linked, the first reaction kettle is used for continuous doping reaction, and the second reaction kettle is used for selective intermittent coating, so that production of products of multiple specifications is supported while the productivity is improved. The method solves the technical bottlenecks of narrow particle size distribution, non-uniform coating and limited productivity in the traditional process, realizes effective preparation of a wide-distribution doped type or doped coating type precursor, remarkably reduces the production cost, and is suitable for the field of consumer electronic battery materials.

The invention provides an antimony-based chalcogenide film with (hk1) dominant orientation and a preparation method and application thereof, and belongs to the technical field of semiconductor photovoltaic materials. According to the method, the crystal orientation of the antimony-based chalcogenide film is regulated and controlled by doping PbI2 in situ under the simple solution method (water bath or hydrothermal) deposition condition, and research results show that the solution method is adopted to introduce PbI2, so that the antimony-based chalcogenide film can be remarkably induced to preferentially grow along the (hk1) direction, grain boundary scattering and inter-chain potential barriers are effectively weakened, and the crystal orientation of the antimony-based chalcogenide film is improved. The carrier longitudinal migration and collection efficiency is improved, so that the VOC loss is reduced, and the final battery performance is improved; the method provided by the invention not only provides a new thought for preparing the high-orientation antimony-based chalcogenide film, but also lays a technical foundation for design and optimization of a bottom battery material in a future laminated battery.

The invention relates to the technical field of battery materials, and particularly discloses a composite material for an aqueous ammonium ion / proton hybrid battery and a preparation method and application thereof. The conductive polymer coated manganese dioxide composite material is prepared by adopting an organic-inorganic interface reaction, the preparation process is simple and easy to operate, the required raw materials are low in cost and easy to obtain, and the synthesized material is a nanoscale material and has the advantages of good dispersity, high specific surface area, good conductivity, stable structure and the like; when the material is applied to the aqueous ammonium ion / proton mixed ion battery, the obtained battery material has excellent rate capability and stable cycle life, has a high application prospect, and provides a new design idea for the existing aqueous ammonium ion / proton mixed ion battery.

The application relates to the technical field of battery materials, and particularly discloses a silicon-oxygen negative electrode material, a preparation method and application thereof. The silicon-oxygen material is coated by adopting a'secondary ethyne carbon coating' process, the deposition conditions of ethyne cracking are accurately controlled, the fluorides remaining on the surface of the active substance are fully coated by the secondary carbon layer, direct contact between the fluorides and the electrolyte is isolated, and the high-temperature storage stability of the material is significantly improved. The battery prepared by adopting the material provided by the application has a highest high-temperature storage initial efficiency of 71%, and the high-temperature storage capacity retention rate of a comparative sample (fluoride exposure) without secondary ethyne carbon coating treatment is only 61%. It is shown that the growth range of the interface impedance of the material provided by the application is significantly reduced after high-temperature storage, and it is shown that the interface side reaction is effectively inhibited.

The application discloses a fused benzothiadiazole derivative, a preparation method thereof, a hole transport material, a hole transport layer and a perovskite battery, and belongs to the technical field of battery materials.The fused benzothiadiazole derivative can be applied as a hole transport material, contains a fused benzothiadiazole unit in a mother nucleus, has a large conjugate core, and has a D-A-D type molecular structure, so that the intermolecular interaction can be strengthened, and the extraction of holes can be promoted.In addition, the fused benzothiadiazole derivative also contains a phosphate group, so that a self-assembled monolayer can be formed in the form of a bidentate bond or a tridentate bond on a transparent conductive glass to improve the contact between the hole transport layer and an ITO interface.Further, the fused benzothiadiazole derivative also contains rich heteroatoms such as sulfur, nitrogen and oxygen, can be used as a Lewis base to passivate free lead iodine ions at the interface, so that the loss caused by charge recombination can be reduced, and the performance of an inverted perovskite solar cell can be improved.

A system (210, 310) configured for coating a coil-type electrode substrate (1) traveling in a process direction (P) and having a coil width extending in a transverse direction (L) perpendicular to the process direction (P) to produce an electrode coil material, the system comprising: a first mold coater (230, 330) configured to coater a first mold (230, 330), a second mold (230, 330), a second mold (230, 330), and a third mold (230, 330), a first electrode substrate (231, 331) comprising a first opening (231, 331) for depositing a battery material onto the coil-type electrode substrate, where the first opening (231, 331) defines a first opening width (w) extending in the lateral direction (L); a second mold coater (240, 340, 440) comprising at least one second opening (241, 341, 342) defining a second opening width (a, b) extending in the transverse direction (L), where the second opening width (a, b) is less than the first opening width (w), and where the second opening (241, 341, 342, 441, 442) is offset downstream from the first opening (231, 331) in the process direction (P), where the second opening width (a, b) is less than the first opening width (w). The second opening (241, 341, 342) is arranged in the transverse direction (L) and is offset from the first opening (231, 331) in the transverse direction (L) such that the second opening (241, 341, 342, 441, 442) comprises a free portion arranged outwardly from the first opening (231, 332) in the transverse direction (L).

The invention belongs to the technical field of battery materials, and particularly relates to a treatment method and treatment equipment for a ternary positive electrode material precursor. The treatment method comprises the following steps: concentrating ternary positive electrode material precursor slurry, adding the concentrated ternary positive electrode material precursor slurry into alkali liquor for soaking at the temperature of 50-80 DEG C, carrying out solid-liquid separation to obtain a solid phase, washing the solid phase with ethanol, and drying the washed solid phase.

The invention discloses a multi-dimensional carbon structure negative electrode material, and belongs to the field of lithium battery materials. The multi-dimensional carbon structure negative electrode material comprises a core layer, a middle layer and a shell layer which are sequentially arranged from inside to outside, the core layer comprises a three-dimensional conductive skeleton loaded with active particles; the material of the middle layer comprises amorphous carbon; the material of the shell layer comprises a metal oxide. The negative electrode material with the core-shell structure is obtained by preparing the multi-layer structure containing the core layer, the middle layer and the outer layer and optimizing the material of each layer. The outer layer and the middle layer can effectively inhibit disordered deposition of metal lithium on the outer surface, active particles of the core layer serve as lithium-loving sites to guide lithium to be nucleated and deposited in fiber coils preferentially, the uniformity and directionality of lithium deposition can be improved through cooperation of the three layers, and therefore growth of lithium dendrites is effectively inhibited; and the safety performance and the cycling stability of the prepared battery are enhanced.

The invention relates to a partition pillar architecture for a memory device. A memory device may include a substrate arranged with conductive contacts in a pattern and openings through alternating layers of conductive and insulating material, which may reduce a pitch between the openings while maintaining dielectric thickness for continuous application of a voltage to the array. After etching the material, an insulating material may be deposited in the trench. Portions of the insulating material may be removed to form an opening in which the cell material is deposited. Conductive posts may extend perpendicular to the plane of the conductive material and the substrate, and are coupled to conductive contacts. The conductive pillars may be divided to form first and second pillars.

The invention discloses a negative electrode modification method for magnesium metal negative electrode surface morphology modification and application, and belongs to the technical field of rechargeable metal battery materials. The invention aims to solve the technical problems of nonuniform magnesium ion deposition, dendritic crystal growth and short cycle life of a magnesium metal battery in the prior art, and provides a negative electrode modification method for modifying the surface morphology of a magnesium metal negative electrode. According to the technical scheme, the negative electrode modification method for modifying the surface morphology of the magnesium metal negative electrode comprises the following steps: (1) removing an oxide layer from the magnesium metal negative electrode to obtain treated magnesium metal; (2) dissolving ammonium fluoroborate in water to obtain an ammonium fluoroborate solution; and (3) reacting the treated magnesium metal obtained in the step (1) with the ammonium fluoborate solution obtained in the step (2) to obtain the modified magnesium metal negative electrode with the modified surface appearance.

The invention discloses a method for identifying thermal runaway reaction kinetic parameters of a high-nickel ternary battery based on DSC (differential scanning calorimetry) multi-exothermic peak heat flow curves, which is characterized by comprising the following steps of: establishing a chemical reaction kinetic model, and identifying the thermal runaway reaction kinetic parameters of the high-nickel ternary battery based on the DSC multi-exothermic peak heat flow curves at different temperature rise rates; and realizing identification of the thermal runaway reaction kinetic parameters of the high-nickel ternary battery by applying a Kissinger equation and a particle swarm optimization algorithm. According to the technical scheme of the method, necessary reaction kinetic parameters can be provided for thermal runaway modeling of the high-nickel ternary battery, compared with a traditional genetic algorithm, the convergence speed is higher, meanwhile, the global search capability is high, thermal contribution decoupling between different reactions of a battery material in the thermal runaway process is achieved, and the thermal runaway modeling efficiency is improved. And improvement means can be researched aiming at high-yield heat reaction among materials, and the risk of thermal runaway of the high-nickel ternary battery is reduced.

The application relates to the technical field of alumina preparation, and particularly discloses a method for reducing the alkalinity of alumina, which comprises the following operations: firstly, mixing alumina with an additive and an organic acid, then performing ball milling, and finally performing calcination; the additive can promote the adhesion of the organic acid and the alumina; the additive and the organic acid are both decomposed into water and carbon dioxide after calcination. The method for reducing the alkalinity of alumina can effectively reduce the pH value of the alumina, does not introduce other impurity ions, is simple to operate, has low energy consumption, and can be used as an adsorbent, a catalyst carrier and an additive in a battery material.

The invention relates to the technical field of organelle separation, and provides a method for rapid purification of peroxisome and oxidation regulation analysis of ultra-long chain fatty acid. The method comprises the following steps: introducing a nucleic acid sequence for coding a fusion protein into a target cell to obtain a cell material, the fusion protein comprising a truncated sequence derived from a peroxisome membrane protein and a tag sequence for affinity purification; taking the cell material as a sample, and separating the peroxisome with the fusion protein from the cell by utilizing an affinity ligand on the basis of a high affinity binding principle. Therefore, according to the method disclosed by the invention, the peroxisome can be rapidly and efficiently enriched, and the whole purification process can be completed within 30 minutes, so that the experimental period is greatly shortened; core protein components of target organelles can be efficiently reserved, and the metabolic activity of peroxisome can be maintained through a complete membrane structure and an internal environment; meanwhile, the same purified sample can synchronously support proteome and metabolome analysis, and direct association of'protein-metabolism 'data is realized.

This invention belongs to the field of battery materials technology, specifically relating to a liquid silicone rubber-type block copolymer binder, its preparation, and its application. The binder is composed of a topological block copolymer consisting of soft and hard segments, with a number-average molecular weight of 20,000–80,000 g / mol and a molecular weight distribution index (PDI) < 1.5. It contains 30%–60% functionalized polydimethylsiloxane segments as soft segments and 40%–70% acrylic acid-amide functionalized olefin units as hard segments. During preparation, a macromolecular RAFT chain transfer agent is used to control the monomers for controlled active radical copolymerization. This invention utilizes a spontaneously induced nanoscale microphase separation structure due to the thermodynamic incompatibility of the soft and hard phases. While providing high adhesion strength, this binder can efficiently dissipate the severe volume expansion stress of the silicon-based anode through dynamic bond dissociation, preventing the active material from pulverizing and detaching, and providing long-term stability of the SEI film, significantly improving the long cycle life and safety performance of high-capacity batteries.

This invention provides a functional current collector, its preparation method, and its application, belonging to the field of battery materials technology. The functional current collector comprises a stacked metal layer, a metal-carbon composite layer, and a carbon layer. Starting from the material and structural design of the functional current collector, this invention introduces a metal-carbon composite layer between the carbon layer and the metal layer. This not only reduces the amount of metal used and increases energy density but also enhances mechanical properties, achieving excellent flexibility and tensile strength. Furthermore, the metal-carbon composite layer significantly reduces interfacial resistance and improves the adhesion between the carbon layer and the metal layer. In addition, the metal-carbon composite layer exhibits good resistance to electrolyte corrosion, improving the stability of each interface and ensuring good structural stability of the functional current collector, thus enhancing its stability during battery use. The bipolar battery prepared based on this method exhibits excellent cycle performance.

The application relates to the field of battery detection. The application can effectively detect metal foreign matters in battery materials. The application discloses a metal foreign matter detection method, device, electronic device and storage medium for battery materials. The metal foreign matter detection method comprises the following steps: performing X-ray imaging on the battery material to obtain a material image; processing the material image to obtain a metal foreign matter image; and counting target metal foreign matters in the metal foreign matter image to obtain the number of the target metal foreign matters. In the metal foreign matter detection method, the battery material is subjected to X-ray imaging to obtain a material image, and the material image is processed to obtain a metal foreign matter image, so that the number of target metal foreign matters can be effectively detected.

The invention relates to the field of battery materials, in particular to a binder and a preparation method thereof, a negative plate and a lithium ion battery. According to the preparation method of the adhesive provided by the invention, a monomer 1 (an itaconic acid-based monomer and / or a fumaric acid-based monomer) is adopted as a main flexible monomer and is copolymerized with conjugated diene, a monomer 2 (a carboxylic acid-based monomer shown in a formula (2)) and a cross-linking monomer, and meanwhile, an amino polyoxyethylene ether nonionic emulsifier is introduced, so that the adhesive is prepared. And by means of a pre-emulsification process, monomer ratio regulation and control, pre-lithiation realized by using lithium alkali in the later stage and the like, a low swelling rate is realized, so that the bonding strength of the material and high conductivity of electrode electrons and ions are ensured, and excellent low-temperature performance is also realized.

The invention belongs to the technical field of perovskite solar cells, discloses a phosphate buffer assisted SnO2 electron transport layer synthesis method for a perovskite solar cell, adopts a phosphate buffer assisted SnO2 gel synthesis method, and significantly improves the defects existing in the traditional SnO2 gel synthesis process. The innovative method for synthesizing SnO2 gel with the assistance of phosphate is introduced, the defects of a traditional synthesis technology are overcome, the efficiency and stability of the perovskite solar cell are remarkably improved, and the method has wide application prospects and huge popularization value especially in preparation of flexible perovskite solar cells and large-area perovskite assemblies. The method not only improves the performance of the perovskite solar cell, but also provides a new thought for sustainable development of solar cell materials in the future.

The application relates to the technical field of battery materials, and discloses a W-doped ternary precursor, a preparation method of the W-doped ternary precursor, a positive electrode material, a positive electrode and a battery. The preparation method of the disclosed W-doped ternary precursor comprises the following steps: heating a plasma equipment with a built-in conventional ternary precursor to 450-500 DEG C to perform plasma element doping; the plasma element doping mode comprises the following steps: introducing a gas tungsten source into the plasma equipment, starting an arc discharge device, setting the voltage to 660-740 V, and fully reacting to obtain a W element-doped ternary precursor. The preparation method provided by the application is simple and convenient to operate, can realize atomic-level uniform distribution of the doped elements, and has good electrochemical performance.

The invention belongs to the field of metal ion battery material synthesis, and particularly provides a sulfur-doped oxygen-nitrogen-enriched conjugated organic material and application thereof in Li < + > / Zn < 2 + > ion batteries. The preparation method comprises the following steps: firstly, preparing 2, 3, 8, 9, 14, 15-hexachlorodiquinoline [2, 3-a: 2 ', 3'-c] phenazine (HANT-Cl) by taking cyclohexanehexone and dichlorobenzene diamine as raw materials, and then synthesizing 6S6O and the derivative thereof by taking HATN-Cl, sodium sulfide nonahydrate and a naphthoquinone derivative as raw materials. The obtained electrode material contains a plurality of oxidation-reduction active sites, multi-electron storage can be carried out, the transfer rate of electrons is improved through the large pi conjugated structure of the conjugated quinoneazine material, and therefore the high theoretical specific capacity and the excellent rate performance are achieved. Due to the addition of the sulfur element, the oxidation-reduction potential of the material is improved, the energy density of a battery can be improved, and the material has a wide application prospect in a Li < + > / Zn < 2 + > ion battery system.

This invention belongs to the field of battery materials technology, and discloses a single-crystal lithium nickel manganese oxide material, its preparation method, and a lithium-ion battery. The single-crystal lithium nickel manganese oxide material contains Li... x Ni 2‑x The percentage content of O2 is C≤1.6%, C=(I LixNi2‑xO2 / (I LixNi2‑xO2 +I LiNi0.5Mn1.5O4 ))×100%, I LixNi2‑xO2 For Li in the XRD refinement results x Ni 2‑x The diffraction peak intensity corresponding to O2, I LixNi2‑xO2 +I LiNi0.5Mn1.5O4 To add LiNi to the XRD refinement results 0.5 Mn 1.5 O4 and Li x Ni 2‑x The diffraction peak intensity of the O2 two-phase model indicates a grain size of 5–11 μm. The aforementioned single-crystal lithium nickel manganese oxide material was prepared via a lithium-deficient high-temperature sintering and lithium-replenished low-temperature sintering process. Li x Ni 2‑x Large-particle monocrystalline lithium nickel manganese oxide materials with low O2 content avoid electrolyte decomposition under high voltage, thus preventing the generation of HF and Li. x Ni 2‑x The O2 reaction can effectively improve the cycle stability of the battery. Simultaneously, the high compaction density of monocrystalline lithium nickel manganese oxide material can enhance the battery's energy density, thermal stability, mechanical properties, and durability. The method for preparing monocrystalline lithium nickel manganese oxide material in this invention is relatively simple, reliable, and effective, and can utilize existing production lines.

The invention provides a brain-computer interface-based cell culture optimization method and system, and belongs to the technical field of cell culture automation and intelligent control. The method comprises the following steps: inputting a cell type and a culture target, and calling database parameters and data; the artificial neural network learns and outputs a culture parameter range; a medicament proportioning scheme and a physical environment regulation and control strategy are generated through multi-algorithm optimization; the medicament precise proportioning module and the closed-loop optical-electric multi-mode regulation and control module are used for executing a scheme and a strategy respectively; and the result verification and feedback module is used for detecting the cell culture effect, feeding back data, optimizing model parameters and forming closed-loop iterative optimization. The system is composed of an input and data unit, an intelligent decision-making unit, an execution unit and a result verification and feedback unit. The device can accurately control a chemical microenvironment and a physical illumination environment, solves related problems in the prior art, stably produces high-quality cells, is especially suitable for brain-computer interface research, realizes culture process standardization and intelligence, and provides reliable cell materials for downstream applications.

The invention relates to a zinc negative electrode with a stannous oxide protective layer constructed based on magnetron sputtering and a preparation method and application of the zinc negative electrode, and belongs to the technical field of aqueous zinc battery materials. The preparation method of the zinc negative electrode for constructing the stannous oxide protective layer based on magnetron sputtering comprises the following steps: depositing a stannous oxide protective layer on the surface of a pretreated zinc substrate in a mixed atmosphere of oxygen and argon by adopting a magnetron sputtering process and taking a metallic tin target as a sputtering source, and then carrying out annealing treatment in an air atmosphere to obtain the zinc negative electrode with the stannous oxide protective layer. Obtaining a finished product. The stannous oxide thin film provided by the invention has good zinc affinity, can induce uniform zinc nucleation and deposition, and has excellent electrochemical stability, so that side reactions such as hydrogen evolution and corrosion can be effectively inhibited; the obtained nano stannous oxide film remarkably reduces the zinc ion migration energy barrier, reduces the polarization voltage and prolongs the cycle life; and the preparation method is simple and convenient in process, controllable in parameters and suitable for large-scale preparation, and has good economical efficiency and application prospects.

This invention provides a method for screening the stability of biomass shell-derived hard carbon raw materials. The method investigates the optimal ratio and relationship between the lignin content and sugar content measured after alkali treatment in biomass shell materials, thereby screening the stability of biomass shell materials from different sources and batches. When the lignin content of the biomass shell material itself and the sugar content measured after alkali treatment satisfy the relationship 15≤β×L≤60, an effective balance between the lignin and sugar content in the biomass shell material can be achieved, resulting in a good porous structure. This method provides a simple and rapid screening process to obtain biomass shell materials with better stability. When biomass shell materials with better stability are subsequently used to prepare hard carbon battery materials, the resulting hard carbon battery materials exhibit good overall performance in terms of cycle life, capacity, and coulombic efficiency.