74 results about "Silicon anode" patented technology

The invention discloses a low-cost high-first-effect micron silicon negative electrode material and a preparation method and application thereof. The preparation method comprises the following steps: treating the surface of micron silicon by adopting an oxidant solution to form a silicon dioxide passivation layer, and then carrying out surface modification by using a silane coupling agent; the method comprises the following steps: performing acid-base alternate soaking treatment on a biomass carbon source to reduce the content of metal impurities; mixing the delimed biomass carbon source, the composite carbon source and the pretreated micron silicon, firstly adding a weak acid catalyst for hydrothermal reaction to form a hard carbon inner layer, then adding a weak base catalyst for regulating the pH value of the system to alkalescence in batches, and continuing hydrothermal reaction to form a soft carbon outer layer; and washing and drying the product, and carrying out carbonization treatment in an inert atmosphere to obtain the composite coated micron silicon material. The first efficiency of the material is greater than or equal to 92%, the 1C 1000-time circulation capacity retention ratio is greater than or equal to 82%, the raw material cost is low, the process is simple, and the material is suitable for lithium ion batteries in the fields of power, energy storage and consumer electronics.

The invention provides a three-dimensional silicon negative electrode material and a preparation method and application thereof. The three-dimensional silicon negative electrode material comprises a porous silicon material, and the pore wall surface and the particle outer surface of the porous silicon material are coated with an oxide layer, a carbon coating layer and a solid electrolyte layer; and the outer surfaces of the particles of the porous silicon material are coated with conductive polymer layers. According to the three-dimensional silicon negative electrode material, the hole wall surfaces and the outer surfaces of the particles are coated with the oxide layers, the carbon layers and the solid electrolyte layers, so that the structural stability of the material is guaranteed, an electron transmission channel and an ion transmission channel are further constructed, and meanwhile, the outer surfaces of the particles are further coated with the conductive polymer layers; and the structural integrity of the three-dimensional silicon negative electrode material in the circulation process is ensured.

This invention relates to the field of secondary battery technology, specifically to a silicon-carbon composite material, its preparation method, and a lithium-ion battery. The preparation method of the silicon-carbon composite material includes: reacting an organometallic framework ZIF-8 in a saturated metal salt solution and then evaporating and crystallizing it to obtain a metal salt-coated organometallic framework Salt@ZIF-8; pulverizing a silicon-copper alloy precursor and the Salt@ZIF-8 at a mass ratio of 1:0.05-0.7 to obtain a mixed powder; and subjecting the mixed powder to a pyrolysis reaction and acid leaching treatment to obtain the silicon-carbon composite material. The silicon-carbon composite material obtained by this invention exhibits excellent structural stability and electrochemical performance, effectively mitigating the volume expansion of the silicon anode and improving cycle performance and rate performance.

This invention belongs to the field of battery active materials technology, specifically disclosing a silicon-oxygen-carbon composite material, its preparation method, and a secondary battery. The silicon-oxygen-carbon composite material is prepared using silicon powder, a carbon source, and an oxygen-generating agent as raw materials via a one-pot, single-step synthesis method, comprising the following processes: heating to a first preset temperature, decomposing the oxygen-generating agent to produce oxygen, oxidizing the silicon on the surface of the silicon particles to form a silicon oxide coating layer, and obtaining Si@SiO. x Particles, 0.5≤x≤2; heated to the second preset temperature, in the Si@SiO x A carbon coating layer is formed on the surface of the particles to obtain the silicon-oxygen-carbon composite material. This invention achieves this by forming a tightly wrapped SiO2 layer on the surface of silicon particles. x The thin film of the silicon layer and the carbon layer effectively buffers the volume expansion of silicon particles during the charging and discharging process, improves the conductivity of the silicon anode, and effectively avoids the side reaction between silicon particles and electrolyte. As an anode material, it exhibits considerable lithium storage capacity and excellent electrochemical performance.

A salt-philic solvent-phobic (SP2) polymer coating on a lithium anode, sodium anode, or a silicon anode selectively transports salt over solvent and is configured to promote salt-derived SEI formation on the anode. The SP2 coating can include a polymer backbone, a first side chain comprising a first moiety having salt affinity, and a second side chain comprising a second moiety immiscible with polar aprotic solvents.

This application provides an electrolyte and a battery using the same. The electrolyte includes a lithium salt, an organic solvent, and a functional additive. The functional additive has the following structural formula: wherein, among R1, R2, R3, R4, and R5, at least one includes at least one of an oxygen-containing substituent, a cyano-containing substituent, an ester-containing substituent, and a nitrogen-containing heterocyclic substituent; R6, R7, R8, R9, and R... 10 R 11 R 12 R 13 The electrolyte contains at least one of oxygen-containing boron heterocyclic substituents and halogen substituents. This electrolyte facilitates the formation of a uniform and dense interfacial film on the positive and negative electrode surfaces, provides interfacial stability, reduces the degree of side reactions at the positive and negative electrode interfaces, and thus optimizes the overall performance of the battery, especially high-nickel ternary / silicon anode batteries.

An element to be used as an anode in a lithium-ion battery comprising a lithiated single crystal porous-silicon layer made on the surface of a p-doped single crystal Si of thickness 25-1000 mm and resistivity of less than 0.01-ohm cm. Successful lithiation is achieved either electrochemically or by direct alloying of lithium metal with the porous-Si with a wide range of porosities. The lithiated silicon anode allows a high cathode loading in a lithium-ion battery resulting in record current densities without the formation of lithium dendrites.

The application provides an anode sheet and a secondary battery using the same, the anode sheet comprising an anode active material layer, the anode active material layer comprising an anode active material and a binder, the anode active material comprising a silicon-based active substance, and the binder comprising polyacrylic acid and its derivatives and polyvinyl alcohol; the anode sheet is laser-perforated; when the mass content of the silicon-based active substance is a constant value, the mass content of the polyvinyl alcohol is in a positive proportional relationship with the power of the laser perforation; and when the power of the laser perforation is a constant value, the mass content of the polyvinyl alcohol is in a positive proportional relationship with the mass content of the silicon-based active substance. Compared with the prior art, the anode sheet provided by the application selects anode sheets containing different contents of the binder according to different laser perforation powers or different silicon contents of the silicon anode sheet, thereby avoiding excessive burning of the active substance at the non-perforated part of the silicon anode sheet, and improving the cycle performance and safety performance of the battery in the charging and discharging process.

Systems and methods for batteries comprising a cathode, an electrolyte, and an anode, wherein the anode is a Si-dominant anode that utilizes water-soluble maleic anhydride- and / or maleic acid-containing polymers / co-polymers, derivatives, and / or combinations (with or without additives) as binders.

This invention discloses a non-aqueous electrolyte for lithium batteries and a lithium-ion battery. The non-aqueous electrolyte for lithium batteries of this invention comprises an electrolyte salt, a non-aqueous solvent, and additives, wherein the non-aqueous solvent is a morpholine compound. The non-aqueous electrolyte for lithium batteries of this invention, using a morpholine compound as a solvent, has a wider electrochemical window, resulting in stronger stability to high-nickel cathode materials and excellent resistance to reduction, significantly improving the storage performance and cycle life of batteries using high-silicon anodes.

The invention relates to the technical field of battery material performance testing, and discloses a silicon negative electrode particle voltage endurance capability characterization testing method which comprises the following steps: preparing silicon negative electrode slurry; coating a pole piece; rolling the pole piece; assembling and testing for the first time to obtain first capacity and first efficiency data; placing the pole piece in a specific humidity environment; assembling and testing for the second time to obtain retested capacity and first efficiency data; the voltage endurance capability is judged, if the difference value of the two lithium intercalation capacities is larger than 1% of the initial lithium intercalation capacity, it is judged that the silicon negative electrode particles do not tolerate the rolling pressure, and otherwise, the silicon negative electrode particles tolerate the rolling pressure; by simulating the actual stress condition in the battery manufacturing process, the characterization test result of the voltage endurance capability of the silicon negative electrode particles is closer to the actual application scene, and the accuracy and reliability of the test are improved; physical testing is carried out, and the stability of the silicon negative electrode particles in electrochemical reaction is evaluated through electrochemical testing, so that the voltage endurance capability of the silicon negative electrode particles is evaluated more comprehensively.

The present invention relates to a silicon anode material for a lithium-ion secondary battery, comprising a granular porous silicon composite formed by the agglomeration of silicon composites, wherein the silicon composite is a flake-shaped silicon composite in which a composite layer, which comprises an oxide layer and a carbon-containing layer, is formed on flake-shaped silicon obtained from waste silicon kerf. A silicon anode material for a lithium-ion secondary battery, comprising the porous silicon composite, and an anode and a lithium-ion secondary battery, which comprise same, can be provided. If composited with graphite, the silicon anode material exhibits excellent packing density, allows more lithium to be charged per unit volume, and uses waste silicon kerf so as to have superior economic feasibility.

This invention relates to a breathable lithium-ion battery module structure, including fasteners, front and rear wall panels, a silicon anode lithium-ion battery, a pull rod, and a breathing plate. The silicon anode lithium-ion battery is fixed by the pull rod, fasteners, and front and rear wall panels. The breathing plate is placed between the silicon anode lithium-ion battery and the front wall panel. The breathing plate is a composite material structure, combining metal and polymer materials to achieve a structure with low elastic modulus and high elastic deformation capability. The breathing plate integrates a thermistor for monitoring temperature information at characteristic locations of the battery pack.

This invention relates to the field of ceramic materials and provides a method for preparing silicon nitride powder, solving the problem of high residual chlorine / oxygen impurities due to the difficulty in removing byproducts during the preparation of silicon nitride in existing technologies. The method includes the following steps: S1, constructing an electrochemical cell: the anode material is a high-purity single-crystal silicon wafer; the cathode material is a graphite plate; the electrolyte is a mixed solvent of liquid ammonia and ethylenediamine with added LiCl electrolyte; S2, electrochemical ammonolysis reaction: under the action of an electric field, the silicon anode is oxidized to generate high-valence silicon-ammonia complex ions; the NH2 released from the liquid ammonia... ‑ The precursor migrates and combines towards the anode to generate a silane precursor containing Si-NH2 bonds; S3, the precursor is purified by washing with liquid ammonia, replacing with organic solvent and drying at low temperature; S4, the precursor is subjected to low-temperature pre-decomposition and high-temperature crystallization treatment under nitrogen protection to obtain high-purity α-Si3N4.

The invention relates to the technical field of lithium battery negative electrode materials, in particular to a silicon-carbon composite material embedded with FeS nanoclusters as well as a preparation method and application of the silicon-carbon composite material. The silicon-carbon composite material provided by the invention comprises nano silicon and a carbon layer coated on the surface of the nano silicon, the carbon layer is a nitrogen and sulfur co-doped carbon layer; and FeS nanoclusters are embedded in the carbon layer. Wherein the carbon layer serving as a soft buffer layer can effectively relieve stress caused by volume expansion of the silicon negative electrode, and nitrogen and sulfur heteroatom doping can further improve the conductivity of the carbon material, so that charge transmission in the electrode is optimized. FeS is introduced to catalyze the delithiation reaction of Li15Si4 with relatively inert electrochemistry, the transmission speed of Li ions in a delithiation potential interval is maximally increased by 128 times, and the residual Li15Si4 is obviously reduced after charging is finished, so that the lithium loss capacity of the material caused by no lithium removal of Li15Si4 is greatly reduced, and the cycle performance is optimized.

The invention discloses a silicon negative electrode active material which sequentially comprises a silicon-based material inner core, a flexible solid electrolyte or gel electrolyte middle layer and a carbon-coated outer layer from inside to outside, the flexible solid electrolyte or gel electrolyte middle layer comprises a conductive agent, and the conductive agent comprises a carbon nanotube. According to the silicon negative electrode active material, the surface of the silicon-based material is coated with the flexible solid-state or gel-state electrolyte, so that the volume change of the negative electrode active material in the charging and discharging process is effectively relieved, the electrolyte is isolated, the stability of the negative electrode active material is improved, and the negative electrode active material has relatively high reversible specific capacity and relatively high specific surface area; and excellent long cycle performance is shown.

This application relates to a silicon anode battery and an electronic device. The silicon anode battery includes a positive electrode, a negative electrode, and an electrolyte. The negative electrode active material includes silicon, with a mass percentage of m% in the negative electrode active material layer. The positive electrode includes a positive current collector and a positive electrode active material layer disposed on at least one side of the positive current collector. The area of ​​the negative electrode active material layer is larger than that of the positive electrode active material layer, and the area difference between the two layers is a% of the area of ​​the negative electrode active material layer. The electrolyte contains additives, including silicon-based compounds, with a mass percentage of b% in the electrolyte. Wherein, 0.00002 ≤ b / (m×a) ≤ 3. The solution provided in this application can preferentially construct a stable interface layer in the inactive region of the electrode by synergistically controlling the electrolyte composition and key negative electrode material parameters, significantly suppressing side reactions and thus improving the battery cycle life.

This invention discloses a method for preparing a bilayer carbon-modified silicon anode material. It belongs to the field of energy conversion and storage technology. It includes the following steps: (1) ultrasonically treating silicon-based particles in an organic solvent, then adding a silane coupling agent to the above dispersion, heating and stirring, centrifuging and drying to obtain a silicon-based material A modified with a silane coupling agent on the surface; (2) dispersing A in an organic solvent, then adding an ionic liquid dropwise to the above dispersion, heating and stirring to obtain an ionic liquid-grafted material B; (3) dispersing material B and rGO material in ethanol, ultrasonically mixing, heating and stirring, and finally washing and drying the product to obtain material C; (4) mixing material C with graphite, degassing and stirring, then performing temperature-controlled sintering, and cooling to room temperature to obtain a bilayer carbon-modified silicon anode material with a first layer of strong linkage between rGO and silicon substrate, and a second layer of graphite carbon homogeneously coating rGO. The method of this invention uses ionic liquids, silane coupling agents, or a combination of the two as interfacial bonding materials to improve the interfacial bonding force of the coating material, thereby reducing the volume expansion of the silicon anode material during charge-discharge cycles, forming a continuously connected buffer layer to overcome the breakage of silicon particles, and improving the interfacial conductivity. It has a significant effect on improving the structural stability of the anode active material in lithium-ion batteries or lithium slurry batteries, and improves the long cycle life of the material.

This invention provides an electrode preparation slurry, a silicon anode, and a solid-state battery. The electrode preparation slurry comprises: a carbon material, a silicon material, a gel polymer electrolyte material, a binder, and a solvent. By introducing a gel polymer electrolyte material with high ion conductivity, this electrode preparation slurry can induce uniform deposition of lithium ions in the three-dimensional pores formed by the various substances in the slurry during battery charging and discharging. This solves the dendrite growth problem caused by uneven lithium deposition. Simultaneously, the storage of lithium metal in the three-dimensional pores provides more expansion space for the silicon material, effectively mitigating the volume expansion effect of the silicon anode. Furthermore, by solving the problems of lithium dendrite growth and silicon expansion in the silicon anode, the cycle performance of the solid-state battery can be effectively improved.

The invention discloses a diatom-based composite material loaded with silicon nanoparticles as well as preparation and application of the diatom-based composite material. In the preparation process of the material, silicon nanoparticles are loaded on the surface and the pore structure of a silicon carbide algae shell with a hollow porous structure, and the material is prepared into the lithium ion battery negative electrode material. The hollow porous structure of the diatom shell provides enough buffer space for the volume expansion of the Si nanoparticles, and the amorphous carbon layer on the surface of the diatom shell can also improve the conductivity of the composite material and improve the initial coulombic efficiency; and the unique hollow porous structure of the diatom shell can accelerate the diffusion speed of lithium ions and improve the rate capability of the silicon negative electrode. The preparation method has the advantages of simple and efficient process, greenness and low consumption, and provides a new path for the development and research of the Si / SiO2 / C composite negative electrode material.

This invention discloses a silicon-carbon composite anode material with a fluorinated surface, its preparation method, and a secondary battery, belonging to the field of lithium-ion battery technology. The silicon-carbon composite anode material includes a silicon substrate and a carbon layer coating the surface of the silicon substrate. The carbon layer is composed of a continuous carbon structure formed by the partial breakage of C-F bonds in a solid fluorinated carbon material; and the fluorine radicals released after the partial C-F bond breakage form Si-F bonds with the silicon substrate. This invention improves the electronic conductivity and enhances the interface stability of the silicon anode. The carbon layer helps to improve electronic conductivity and alleviate volume expansion. During battery cycling, the Si-F bonds can be converted into a stable solid electrolyte interphase (SEI) rich in LiF, effectively suppressing electrolyte decomposition and active lithium consumption, significantly improving rate performance and cycle life, and reducing dependence on electrolyte additives. This invention features a simple and efficient process, is easy to scale up, reduces production costs, and improves the overall performance of the battery.

An electrode includes an electrically conductive porous graphene core; a silicon layer disposed on an internal surface of the porous graphene core; and an ion-conductive hybrid silicate layer disposed on the silicon layer.

The invention relates to a method for producing a silicon electrode as an anode for a lithium ion battery, in which an active layer is deposited on a substrate, preferably copper, and then undergoes a rapid tempering, as well as an anode produced using same. The object of the invention of providing a method, which dispenses with the need for a vacuum section for depositing the active material, in particular silicon, for the production of anodes for lithium ion batteries, and thereby allows for an extremely cost-optimised production of almost pure silicon anodes for lithium ion batteries, is achieved in that the active layer is formed from a silicon and metal particle mixture, which is applied to the substrate in a dry process and stabilised in a controlled manner via the rapid tempering to form a semi-porous active layer and fixed to the substrate.

This invention discloses a narrow-distribution functionalized aqueous latex and its preparation method, belonging to the field of aqueous latex preparation technology. The latex uses functionalized monomers, aromatic vinyl monomers, and aliphatic conjugated diene monomers as main raw materials, introduces silane coupling agent-modified cellulose nanocrystals, and combines them with an initiator, emulsifier, and water, undergoing one-step emulsion polymerization. The modified cellulose nanocrystals can form a physical barrier on the surface of the latex particles, reducing the content of embedded acid and free acid in the aqueous phase, and increasing the surface carboxyl group density; its rigid structure forms a three-dimensional network after film formation, effectively suppressing the volume expansion of the silicon anode. The resulting latex has a particle size of 245~255nm, a narrow particle size distribution, moderate viscosity, and high bonding strength. When used as a lithium battery anode binder, it exhibits high electrode peel strength, good slurry dispersibility, and excellent battery cycle stability. This invention features a simple process, readily available raw materials, and easy industrial scale-up, making it suitable for lithium battery anode binders, paper coating, and aqueous adhesives.

The invention discloses a preparation method and application of a nanocellulose-based silicon negative electrode binder, and belongs to the technical field of lithium ion batteries, during preparation of the binder, CMC powder and TOCNF suspension are uniformly mixed at room temperature, and ultrasonic dispersion is performed to obtain the nanocellulose-based silicon negative electrode binder; tEMPO nanocellulose is adopted as one of binder components, and a common CMC binder is assisted to maintain the stable cycle performance of the silicon monoxide negative electrode material; rigid TOCNF with a high length-diameter ratio is introduced into a traditional CMC system, carboxyl groups on the surface of the rigid TOCNF and a silicon-based material form stable hydrogen bonds, the interface adhesive force is enhanced, meanwhile, a three-dimensional supporting network is constructed, and when the rigid TOCNF is used as a silicon-based lithium ion battery negative pole piece material, the rigid TOCNF and SBR cooperate to buffer stress, expansion and cracking of a pole piece are effectively inhibited, and the cycling stability of a high-capacity silicon monoxide battery is improved; and the nanocellulose has the advantages of no toxicity and harmlessness and biodegradability during battery recovery, conforms to the green cycle concept, and has a great commercial application prospect.

This present disclosure is directed to electrolyte compositions for lithium-ion batteries comprising novel ionic liquids or a molecular solvent novel to electrolyte usage, lithium-ion batteries comprising the electrolyte compositions, and methods of assembly and supplying power thereof.

Systems and methods for sulfur-containing chemicals as cathode additives for silicon-based lithium ion batteries may include a silicon-based anode, an electrolyte, and a cathode. The cathode may include an active material and a sulfur-containing additive. The cathode active material may include one or more of nickel cobalt aluminum oxide (NCA), nickel cobalt manganese oxide (NCM), lithium iron phosphate (LFP), lithium cobalt oxide (LCO), and lithium manganese oxide (LMO). The sulfur-containing additive may include elemental sulfur and / or Li2S. The sulfur-containing additive may include one or more of lithium polysulfides (Li2Sn, where n=2-8), polysulfides, and organic polysulfides. The sulfur-containing additive may include one or more of metal sulfides, transition metal polysulfide complexes, S-containing organic polymers or copolymer, polymeric sulfur, and transition metal sulfides. The sulfur-containing additive may include 5% or less by weight of the active material, or 1% or less by weight of the active material.

The present invention relates to a silicon-carbon composite used as an anode material for a secondary battery, a method for preparing same, and an anode material using same, and, more specifically, to a low-expansion silicon-carbon composite, a preparation method therefor, and an anode material using same, the composite having a carbon coating layer formed on the surface of a carbon-silicon composite particle so as to minimize, when the composite is applied as an anode material for a secondary battery, an increase in volume of the composite, so as to increase long-term stability, and having a specific heteroelement doped into the carbon coating layer of the composite so as to improve electrical conductivity.

The invention discloses a preparation and working condition management strategy for a capacity-recoverable long-cycle all-solid-state battery, relates to the technical field of all-solid-state batteries, and solves the problems that when a silicon anode lithium metal all-solid-state battery runs, the running stability is easily influenced due to the diameter problem of a lithium metal negative electrode and the silicon volume expansion problem, and effective capacity management is difficult to carry out. And the service life of the battery is shortened. According to the capacity-recoverable long-cycle all-solid-state battery preparation and working condition management strategy, the preparation method comprises the following steps: S1, carrying out pre-physicochemical treatment on silicon powder to obtain pre-lithiated silicon; and S2, mixing the pre-physicochemical silicon with a solid electrolyte, a binder and a conductive agent according to a mass ratio to obtain the negative electrode mixed material. Silicon is subjected to pre-physicochemical treatment and then mixed with the solid electrolyte, the binder and the conductive agent, the mixture, the positive electrode composite material and the electrolyte composite material are assembled into the solid-state total battery according to a conventional method, and the solid-state total battery shows excellent stability.