380results about How to "High specific capacity" patented technology

The invention provides a silicon-carbon composite material as well as a preparation method and application thereof. The silicon-carbon composite material comprises a porous carbon material; the silicon particles are distributed on the surface layer of the porous carbon material and in pore channels in the porous carbon material, the distribution concentration of the silicon particles in the surface layer of the porous carbon material is smaller than that of the silicon particles in the porous carbon material, and the particle size of the silicon particles in the surface layer of the porous carbon material is smaller than that of the silicon particles in the porous carbon material; the silicon dioxide layer is formed on the surface of the silicon particles; and the carbon coating layer is formed on the surface of the silicon dioxide layer. The lithium ion battery prepared by taking the silicon-carbon composite material as a positive electrode active material shows good electrochemical performance, and has relatively high specific capacity, good cycling stability and rate capability.

The invention provides a preparation method of a lithium manganese iron phosphate material, and relates to the technical field of positive electrode materials. The preparation method of the lithium manganese iron phosphate material comprises the following steps: mixing a first raw material component consisting of ferromanganese oxalate, a first lithium source, a first phosphorus source, a first carbon source and a first doping agent, adding deionized water, grinding, and then carrying out spray drying to obtain a precursor A; mixing a second raw material component consisting of carbon-coated ferromanganese oxalate, a second lithium source, a second phosphorus source, a second carbon source and a second doping agent, adding deionized water, grinding, and performing spray drying to obtain a precursor B; and uniformly mixing the precursor A and the precursor B, sintering in an inert atmosphere, and crushing to obtain the lithium manganese iron phosphate material. According to the lithium manganese iron phosphate material, on the premise of ensuring high specific capacity, relatively high compaction density and relatively high rate capability are realized at the same time.

The invention provides a sodium-ion battery negative electrode material, a preparation method thereof and a sodium-ion battery, and relates to the technical field of battery negative electrode materials. According to the method, oxidized asphalt is used as a soft carbon material, and hydroxyl-rich biomass (chitin, chitosan and lignin) is used as a hard carbon precursor; and mixing the two materials, and performing crosslinking and carbonization treatment to obtain the sodium-ion battery negative electrode material. According to the technical scheme, by adjusting the proportion of soft carbon and hard carbon and optimizing crosslinking conditions, the crosslinking degree between the soft carbon and the hard carbon is improved, formation of a more stable crosslinking structure is promoted, the specific capacity and the rate capability of the negative electrode material can be effectively improved due to the appearance of the crosslinking structure, the rapid charging and discharging capacity of the negative electrode material under high rate is enhanced, and the service life of the negative electrode material is prolonged. The battery can meet the requirement of quick charging, the applicability of the battery in high-power application is expanded, and the battery has wide application prospects in the fields of electric automobiles, energy storage systems and the like.

The invention provides a preparation method of a multi-element doped asphalt-based hard carbon material for a negative electrode of a sodium-ion battery, which comprises the following steps: (S1) mixing and crushing asphalt and zinc salt of organic acid, and pre-oxidizing in an oxygen-containing atmosphere to obtain pre-oxidized asphalt particles; (S2) uniformly mixing the pre-oxidized asphalt particles, N-containing aromatic polyaldehyde and 1-hydroxyethylidene-1, 1-diphosphonic acid, and carrying out heating reaction in an inert atmosphere to obtain modified asphalt particles; and (S3) carrying out high-temperature carbonization on the modified asphalt particles in an inert atmosphere to obtain the multi-element doped asphalt-based hard carbon material. Firstly, an asphalt precursor and organic acid zinc are mixed and then pre-oxidized, then a cross-linking agent containing N and a cross-linking agent containing P are added for cross-linking, the obtained hard carbon material has a short-range ordered structure, and the sodium storage capacity and the sodium ion transmission capacity are both improved. The hard carbon material obtained by the preparation method has high specific capacity and first coulombic efficiency, and the rate capability is also improved.

The invention provides a B / N co-doped high-graphitization-degree artificial graphite negative electrode material and a preparation method thereof, and the preparation method of the artificial graphite negative electrode material comprises the following steps: crushing raw material coke to obtain primary particles, and then mixing, granulating and shaping to obtain secondary particles; fully mixing the obtained secondary particles with an organic nitrogen source, and then pre-carbonizing to obtain a nitrogen-doped precursor; and fully mixing the obtained nitrogen-doped precursor with an organic boron source, and then carrying out secondary carbonization, shaping and graphitization to obtain the B / N co-doped high-graphitization-degree artificial graphite negative electrode material. The artificial graphite negative electrode material disclosed by the invention has high energy density and high rate performance, and meanwhile, the first efficiency can also be improved.

The invention discloses a high-nickel lithium-rich manganese-based all-solid-state battery positive electrode material which comprises a nickel cobalt lithium manganate inner core and a NiO layer coated on the surface of the inner core, in the high-nickel lithium-rich manganese-based all-solid-state battery positive electrode material, the weight percentage of NiO is 1-5%. The positive electrode material is nickel cobalt lithium manganate with the surface coated with the NiO layer, the NiO coating layer with high chemical stability on the surface of the positive electrode material can serve as a protective layer at a positive electrode / electrolyte interface, on one hand, lattice oxygen on the surface of the positive electrode material can be stabilized, and phase degradation of the positive electrode material in the circulation process is reduced; on the other hand, the material can be used as a buffer layer to limit direct contact between the positive electrode material and the solid electrolyte, thereby weakening side reaction between the positive electrode material and the solid electrolyte and finally improving specific capacity and cycle performance of the solid-state battery. The invention also discloses a preparation method of the high-nickel lithium-rich manganese-based all-solid-state battery positive electrode material, the all-solid-state battery positive electrode material and an all-solid-state battery.

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

The invention discloses a preparation method of a carbon / bimetallic selenide composite microsphere material, which comprises the following steps: mixing hollow carbon microspheres and dimethylimidazole according to a mass ratio, heating to react, washing a product, and drying to obtain an organic ligand / hollow carbon microsphere compound; dispersing the organic ligand / hollow carbon microsphere compound in an organic solution, then adding metal salt, stirring and reacting for a certain time, and centrifuging and drying a reaction product to obtain a metal organic ligand / hollow carbon microsphere composite material; and mixing the metal organic ligand / hollow carbon microsphere composite material and selenium powder according to a mass ratio, and calcining in an inert atmosphere to obtain the carbon / bimetallic selenide composite microsphere material. According to the carbon / bimetal selenide composite microsphere material, the volume expansion of metal selenide is inhibited by virtue of hollow carbon microspheres, the conductivity of the metal selenide is enhanced, meanwhile, active sites of the metal selenide are enhanced by virtue of space confinement, charge transfer is accelerated by virtue of a bimetal heterostructure interface, and the electrochemical performance of the material is improved.

The present invention relates to a polymer solid electrolyte diaphragm with a multilayer structure and a preparation method and application thereof. The diaphragm structure is a multilayer structure of polymer layer / skeleton material layer / polymer layer, wherein the skeleton material layer is mainly a skeleton material and is also infiltrated by the polymer layer; the polymer layer is a polymer material with lithium ion conductivity. In the multilayer structure of the present invention, a small amount of liquid electrolyte remaining in the rich gaps of the metal-organic framework material tightly arranged in the skeleton material layer forms a liquid film, which can provide a liquid transmission channel when the solid electrolyte diaphragm transmits lithium ions, improve the lithium ion transmission rate and lithium ion migration number of the electrolyte diaphragm, and at the same time, the good mechanical strength and thermal stability of the fiber cross-linking structure can improve the mechanical properties and flame retardant properties of the polymer electrolyte diaphragm. The obtained lithium metal battery and lithium ion battery have a longer cycle life and a higher specific capacity. At the same time, the process of the present invention is simple and easy to operate, and is suitable for industrial production.

The invention belongs to the technical field of lithium batteries, and provides a preparation method of a boron-doped coated lithium iron manganese phosphate positive electrode material and a lithium battery, and the method comprises the following steps: S10, performing first pretreatment based on a lithium source, an iron source, a phosphorus source, a dopant, a dispersant, a first MOF and a solvent to obtain a first precursor; s20, performing first sintering crushing on the first precursor in an inert gas atmosphere to obtain a lithium iron phosphate precursor; s30, performing second pretreatment based on the second MOF, deionized water, a carbon source, a dispersing agent and the lithium iron phosphate precursor to obtain a second precursor; and S40, grinding and drying the second precursor, and carrying out second sintering crushing in an inert gas atmosphere to obtain the lithium iron manganese phosphate positive electrode material. Wherein the first MOF is a boron-based MOF, and the second MOF is a manganese-based MOF. The lithium ion intercalation and deintercalation efficiency is improved, the specific capacity, the cycle capacity retention ratio, the compaction density and the safety of the battery are improved, and the performance of the material is improved from multiple aspects.

The invention relates to the technical field of polymer electrolyte, in particular to a perfluoropolyether-terminated single-ion polymer, a preparation method and application thereof, and a battery comprising the single-ion polymer. A scheme for synthesizing a brand new polymer is adopted, a perfluoropolyether-terminated single-ion polymer is provided, the key point is focused on PEO-based electrolyte window voltage, lithium ion transference number and inhibition of PEO-based electrolyte lithium metal battery negative electrode dendritic crystal growth, the polymer is blended with PEO through the design of the polymer, and the PEO-based electrolyte lithium metal battery negative electrode dendritic crystal growth is inhibited. Therefore, the performance of the PEO-based lithium metal battery is improved.

The invention provides a preparation method of a wide-temperature-range high-capacity cascade aqueous zinc-iodine battery and the aqueous zinc-iodine battery, and belongs to the technical field of aqueous zinc ion batteries, the preparation method comprises the following steps: dissolving zinc perchlorate, bacterial cellulose, acrylamide, 1-vinyl-3-butylimidazolium bromide, a cross-linking agent and an initiator in water together to obtain a mixed solution; and carrying out polymerization reaction on the mixed solution at 60-80 DEG C to obtain the bromine-rich polycation hydrogel electrolyte, an iodine composite material is used as a positive electrode, metal zinc is used as a negative electrode, the bromine-rich polycation hydrogel electrolyte is used as an electrolyte, and the aqueous zinc-iodine battery is assembled. The aqueous zinc-iodine battery prepared by the method has extremely high specific capacity and excellent cycle performance in a wide temperature range from-50 DEG C to 50 DEG C.

The invention discloses a negative plate, a lithium ion battery and electric equipment. The negative plate comprises the negative plate, the lithium ion battery and the electric equipment. The negative plate comprises a negative current collector and a negative active material layer located on at least one side of the negative current collector, the negative active material layer comprises a negative active material, and the negative active material comprises a graphite material, a hard carbon material and a silicon-based material; the particle size D50 of the graphite material, the particle size D '50 of the hard carbon material and the particle size D' '50 of the silicon-based material meet the conditions that 1.5 < = D50 / D' 50 < = 2.5 and 1.1 < = D '50 / D' '50 < = 3. According to the scheme, through the matching of the sizes and the particle sizes of the graphite, the hard carbon and the silicon-based material, the short plate of low compaction density of the hard carbon is effectively improved, the overall compaction density of the negative pole piece is improved, the energy density of the battery is favorably improved, the infiltration of electrolyte is facilitated, the liquid retention of the pole piece is improved, the rapid embedding of lithium ions is also facilitated, and the rate capability is improved.

The invention relates to a negative active material and a preparation method thereof, a negative pole piece and a lithium ion battery, and belongs to the technical field of electrochemistry. The negative electrode active material comprises a composite core material and a coating material, the composite core material comprises a substrate material and a first material, the substrate material is provided with a plurality of pores, and the first material is arranged on the pore walls of the pores of the substrate material; the coating material coats at least part of the outer surface of the composite core material; wherein the nucleation overpotential of lithium on the first material is smaller than the nucleation overpotential of lithium on the coating material, so that lithium ions are more prone to nucleation and deposition on the first material, and formation of lithium dendrites is reduced; the coating material further protects the inner core material and prevents the inner core material from being in direct contact with the electrolyte, so that the probability of side reaction between the metal lithium and the electrolyte / electrolyte is reduced, and the cycle performance is improved.

The invention discloses a sulfur-doped composite hard carbon material as well as a preparation method and application thereof. Sulfonated resin is used as a carbon source and a sulfur source, and non-metal sulfur atoms with the atomic radius larger than that of carbon are doped in situ, so that the carbon layer spacing of hard carbon is increased, and the rate capability of the hard carbon is improved; and the sulfonated resin is subjected to surface pre-coating modification by using a cheap biomass carbon source, so that the specific surface area and defect sites of hard carbon are reduced, the number of closed pores is increased, and the specific capacity and the first coulombic efficiency of the hard carbon are improved.

The invention discloses a silicon-based negative electrode material as well as a preparation method and application thereof. The silicon-based negative electrode material comprises porous zeolite, and silicon and non-metal doping elements deposited in pores of the porous zeolite, wherein the material of the non-metal doping element comprises one or more of B, P, S, N, C, As and Te; the mass of the non-metal doping element accounts for 0.5%-15% of the total mass of the silicon-based negative electrode material; the mass of silicon accounts for 50-80% of the total mass of the silicon-based negative electrode material; when the silicon-based negative electrode material disclosed by the invention is applied to the lithium battery, the lithium battery can have relatively low volume expansion rate, relatively high specific capacity and good conductivity and cycle performance.

According to the double-site doped ferric sodium pyrophosphate / carbon composite positive electrode material and the preparation method thereof, tungstate is introduced in the raw material mixing process, and the Fe site and the PO4 site are respectively occupied in the forms of W < 6 + > and WO4 < 2-> in the synthesis process; the chemical formula of the obtained double-site doped ferric pyrophosphate sodium / carbon composite positive electrode material is Na4Fe3-xWx (PO4) 2-y (WO4) y (P2O7) / C, x is greater than or equal to 0 and less than or equal to 0.3, and y is greater than or equal to 0 and less than or equal to 0.3. The invention also comprises a preparation method of the double-site doped ferric sodium pyrophosphate / carbon composite positive electrode material. According to the double-site doped ferric pyrophosphate sodium / carbon composite positive electrode material, the phase purity is greatly improved, non-active marmite type ferric phosphate sodium and low-capacity ferric pyrophosphate sodium impurity phases do not exist, and sodium-iron antisite defects in the structure are obviously reduced. The positive electrode material is good in electronic conductivity and ionic conductivity, high in specific capacity, good in rate capability and long in cycle life, and the high and low temperature performance is also remarkably improved.

The invention provides a lithium metal negative electrode current collector, a preparation method thereof and a lithium metal battery, and the method comprises the following steps: carrying out single-side treatment on carbon cloth in oxygen plasma for 8-12 seconds to obtain gradient activated carbon cloth; the preparation method comprises the following steps: dissolving Zn (NO3) 2 and urotropine in water, and slowly adding ammonia water to obtain a colorless and transparent precursor solution; and transferring the precursor solution into a polytetrafluoroethylene liner, carrying out hydrothermal reaction on the precursor solution and gradient activated carbon cloth, cooling to room temperature, and washing and drying to obtain the lithium metal negative electrode current collector. The three-dimensional carbon cloth current collector with longitudinal zinc oxide gradient distribution is obtained through single-sided oxygen plasma treatment and a one-step hydrothermal method, and meanwhile, lithium is induced to deposit from bottom to top and uniformly grow in a three-dimensional carbon cloth framework with ZnO lithium-loving sites gradient distribution by effectively controlling the concentration distribution of ZnO, so that the formation of lithium dendrites is inhibited; the cycle stability of the electrode is improved, and long cycle stability and high energy density of the lithium battery are realized.

The invention discloses porous carbon, a preparation method thereof and a silicon-carbon material with high silicon content. The preparation method comprises the following steps: dispersing a carbon raw material, modified nano silicon dioxide and carbon nanotubes in ethanol to obtain mixed slurry, and performing spray drying on the mixed slurry to obtain a carbon source precursor; the preparation method comprises the following steps: pre-carbonizing a carbon source precursor in an inert atmosphere, mixing pre-carbonized powder with an alkaline activator, and activating in an activating furnace to obtain activated powder; and adding the activated powder into a hydrofluoric acid solution for soaking, removing the modified nano silicon dioxide, filtering, washing and drying, thereby obtaining the product. The modified nano silicon dioxide is prepared by carrying out esterification reaction on fatty acid and nano silicon dioxide. The number of 2-50nm mesopores in the porous carbon structure is obviously increased, the interface bonding force of deposited silicon and the carbon-based carrier is improved, and the advantages of the silicon-carbon negative electrode material on the discharge gram capacity and the cycling stability are effectively enhanced.

The invention discloses a lithium iron phosphate positive electrode material, a preparation method thereof and a lithium ion battery, and relates to the technical field of batteries. The lithium iron phosphate positive electrode material comprises primary particles and secondary particles, the secondary particles are formed by aggregating the primary particles, the lithium iron phosphate positive electrode material meets # imgabs0 # = 5-40 and rho% = 50%-90%, FSSS refers to the Fisher particle size of the lithium iron phosphate positive electrode material, DBET refers to the specific surface area particle size of the lithium iron phosphate positive electrode material, and rho% refers to the relative density of the secondary particles. The invention provides the lithium iron phosphate positive electrode material which simultaneously meets the conditions that # imgabs1 # is equal to 5-40 and rho% is equal to 50%-90%, the lithium iron phosphate positive electrode material has good dispersity, low agglomeration degree and high compaction density, and a positive plate prepared from the lithium iron phosphate positive electrode material has the characteristics of uniform surface density and high peel strength, so that a battery prepared from the lithium iron phosphate positive electrode material has relatively high specific capacity and cycling stability.

The invention discloses a Sn-doped high-voltage lithium nickel manganese oxide positive electrode material as well as a preparation method and application thereof, and belongs to a lithium ion battery positive electrode material. The preparation method comprises the following steps: 1) dissolving a lithium source, a nickel source, a manganese source and a tin source which are acetate in water, then adding a complexing agent citric acid, and stirring for reaction; 2) drying and spraying the obtained mixed solution to obtain solid powder; and 3) pre-sintering, grinding, re-sintering and grinding the obtained solid powder to obtain the Sn-doped high-voltage lithium nickel manganese oxide positive electrode material. The obtained high-voltage lithium nickel manganese oxide positive electrode material is high in purity, has excellent uniform granularity and a good truncated octahedral crystal structure, has excellent lithium ion conduction and electron conduction performance and shows high specific capacity and cycling stability, and the structural stability is effectively improved by Sn doping; and the preparation process is simple to operate, few in procedures, high in production efficiency, cheap and easily available in raw materials and beneficial to industrial production.

The invention relates to the technical field of sodium / lithium ion battery negative electrode materials, and discloses a molybdenum-based negative electrode material and a preparation method and application thereof.The molybdenum-based negative electrode material comprises a nitrogen and sulfur co-doped carbon nano short rod, and the carbon nano short rod is filled with a core-shell type molybdenum-based nano roll; the core-shell type molybdenum-based nano roll comprises a molybdenum dioxide core and a molybdenum disulfide shell layer with a bent structure, and the number of the molybdenum disulfide layers is 12-35. The molybdenum-based negative electrode material provided by the invention is composed of a carbon nano short rod coating layer and a core-shell type MoO2-MoS2 nano roll filled in the carbon nano short rod coating layer; the MoO2-MoS2 nano-roll is obtained by homologous conversion of MoO3 nano short rods and has unique core-shell structure characteristics, and the MoO2-MoS2 nano-roll and the MoO3 nano short rods form a large number of heterogeneous interfaces to provide abundant reaction active sites for storing sodium ions or lithium ions and accelerating electrochemical reaction kinetics; according to the present invention, the MoS2 shell layer has the bending structure characteristic, and the number of the MoS2 layers is controlled to 12-35 through the confinement pyrolysis temperature and the sulfur-containing initiator consumption so as to obtain the excellent sodium / lithium storage performance, and the excellent rate performance and the excellent cycle stability are provided when the MoS2 / lithium battery is used;

The invention provides a metal organic framework sodium ion battery positive electrode material Mn-PTO, a preparation method and application, and belongs to the technical field of battery development. According to the material, an organic ligand pyrene tetraketone with conjugate extension is selected, 2, 7-dicarboxyl-4, 5, 9, 10-pyrene tetraketone PTO-(COOH) 2 is synthesized through a series of reactions, and the material has four energy storage sites and can provide high specific capacity. The high reversible specific capacity of 160.1 mAh g < 1 > can be achieved under the current condition of 0.1 A g < 1 >; even under the current condition of 5A g < 1 >, the reversible specific capacity of 118.1 mAh g < 1 > can be realized after 7000 cycles. And stable circulation can be carried out for 10000 times under the high current of 10A g < 1 >. Therefore, the material has huge potential in the aspect of being used as a sodium-ion battery positive electrode.

The invention relates to an asphalt-based silicon-carbon composite material, a preparation method thereof and a lithium ion battery. The preparation method comprises the following steps: providing pitch coke, sodium hydroxide and lithium carbonate, uniformly mixing the raw materials, calcining in a nitrogen atmosphere, sequentially washing with mixed acid and deionized water after calcining, and carrying out vacuum drying to obtain pitch-based porous carbon; adding the pitch-based porous carbon into a vacuum furnace, and respectively introducing heteroatom gas, silane gas and metal compound gas in stages to obtain a metal-doped silicon-carbon precursor material; and heating the metal-doped silicon-carbon precursor material, introducing oxidizing mixed gas for passivation, soaking the passivated metal-doped silicon-carbon precursor material in an organic solvent of an organic lithium compound, uniformly mixing, and carrying out spray drying to realize secondary coating, thereby obtaining the asphalt-based silicon-carbon composite material. The asphalt-based silicon-carbon composite material has a three-layer core-shell structure, so that the stability and the performance of the material are improved, and the first efficiency and the power performance of the material can be improved.

The invention discloses a biomass porous carbon electrode material, a preparation method thereof and application of the biomass porous carbon electrode material in a room-temperature sodium-sulfur battery, and belongs to the technical field of preparation of a room-temperature sodium-sulfur battery positive electrode material.The biomass waste is pretreated and then pre-carbonized, then a pore-forming agent is added for mixing, ball milling and activation, a hydrochloric acid solution is added, heating and stirring are conducted, and cleaning and suction filtration are conducted to obtain the biomass porous carbon electrode material. And mixing the biomass porous carbon material with sulfur powder, and carrying out heat treatment so as to obtain the biomass porous carbon electrode material. The positive electrode is activated by a chemical reagent, has a multi-stage pore structure and inhibits the volume expansion of the positive electrode in a physical mode. According to the present invention, the large pores are beneficial to the passing of electrolyte ions, the mesopores can ensure the high sulfur loading amount, and the small pores can provide the extremely high specific surface area and the large adsorption volume, such that the shuttle effect caused by the conversion of the polysulfide in the room temperature sodium-sulfur battery can be effectively solved, and the actual specific capacity and the rate capability of the room temperature sodium-sulfur battery can be improved;

The present invention discloses a silicon-carbon negative electrode material modified with a magnetic transition metal oxide and a preparation method thereof, and belongs to the technical field of lithium-ion battery micro-nano materials. The preparation method provided by the present invention has readily available raw materials, low prices, a simple preparation process flow, easy operation, low energy consumption, and environmental friendliness in the preparation process. The prepared silicon-carbon negative electrode material has a uniform and dense modified layer containing a magnetic transition metal oxide, which can effectively improve the conductivity, high specific capacity, and cycle stability of the silicon-carbon negative electrode material. The first coulomb efficiency reaches more than 80%, and the specific capacity can be stabilized to a maximum of 1127mAh / g after 100 cycles, which is much higher than the current average level of this type of material. In addition, the prepared silicon-carbon negative electrode material has excellent mechanical flexibility and can be directly used in the assembly of lithium-ion batteries, and has strong application potential in flexible wearable electronic devices in the future.

The invention discloses an all-solid-state battery and a preparation method thereof, and belongs to the technical field of solid-state batteries. Comprising electrolyte crushing, mixing and coating processes, an acoustic resonance method is used in each process, a final solid electrolyte is obtained, the electrode material is prepared through the acoustic resonance method based on the prepared solid electrolyte, the specific capacity of the electrode material prepared through the acoustic resonance method is improved, and compared with an existing mainstream ball milling process, the specific capacity of the electrode material is greatly improved. And the process time is reduced from several hours to minute level, so that the efficiency of each flow is greatly improved, and the preparation efficiency of the whole all-solid-state battery is further improved.

The invention relates to a carbon nanosheet loaded with atomic-scale active sites, a diaphragm, a water-based zinc halogen battery and a preparation method of the water-based zinc halogen battery, the carbon nanosheet is loaded with monatomic Zn, monatomic Mn and Zn-Mn atom pair active sites, the carbon nanosheet is used on the diaphragm and assembled into the water-based zinc halogen battery, the monatomic Mn is responsible for adsorbing a halogen reaction intermediate on the positive electrode side, and the monatomic Mn is responsible for adsorbing a halogen reaction intermediate on the negative electrode side. The Zn-Mn atom pair further catalyzes and converts the intermediate products into I- / Br-in time, so that the utilization rate of halogen species is increased, irreversible loss of active species of a halogen positive electrode is prevented, and the capacity retention rate is increased; the coulombic efficiency of the assembled zinc-halogen (Zn-I2) battery can still be maintained at 90.15% after the assembled zinc-halogen (Zn-I2) battery is charged and stands for 120 hours, and the self-discharge resistance of the battery is obviously improved.

The invention discloses a nanometer silicon-based negative electrode material as well as a preparation method and application thereof, and relates to the technical field of lithium ion battery negative electrode materials. The invention relates to a preparation method of a nano silicon-based negative electrode material, which comprises the following steps: uniformly mixing silicon nanoparticles, a surface modifier and a solvent to prepare a surface modification reaction suspension of nano silicon, carrying out stirring reaction, centrifugally separating out bottom precipitate, and drying to obtain surface-modified nano silicon; dispersing the surface-modified nano silicon into a methanol solution, adding zinc nitrate and 2-methylimidazole, dissolving the zinc nitrate and the 2-methylimidazole to obtain a uniform suspension, performing stirring reaction, performing centrifugal separation to obtain bottom precipitate, and washing and drying the precipitate to obtain composite material powder; and sintering the composite material powder in a reducing atmosphere to obtain the nano silicon-based negative electrode material. The problems of poor structure uniformity, insufficient pore structure optimization, high cost and complexity, weak interface bonding and the like are solved.

The invention belongs to the technical field of lithium ion batteries, provides a high-entropy high-nickel single crystal lithium ion battery positive electrode material and a preparation method thereof, and aims to solve many problems of a high-nickel nickel cobalt lithium manganate positive electrode material and improve the comprehensive performance of the high-nickel nickel cobalt lithium manganate positive electrode material. Aiming at the modification requirement of the high-nickel layered nickel cobalt lithium manganate ternary system positive electrode material, a high-entropy alloy doping strategy is provided on the basis of a combination design and a component proportion design, and meanwhile, the strict design of a preparation process is combined on the basis of high-entropy alloy doping, so that the positive electrode material after high-entropy doping presents a single-crystal morphology, and the high-entropy doping performance of the positive electrode material is improved. The specific molecular expression is Li < 1 + delta > [Ni < 0.86 + / -x > Co < 0.04 + / -x / 2 > Mn < 0.1 + / -x / 2 > (OH) < 2 >] < 1-z > MzO2, delta is greater than or equal to 0 and less than or equal to 0.2, x is greater than or equal to 0 and less than or equal to 0.06, and z is greater than or equal to 0.005 and less than or equal to 0.25; m is at least five of Al, Mg, Ti, Zr, Ga, In, Y, La, B, Si and Nb. In conclusion, the high-entropy and high-nickel positive electrode material with the single crystal morphology is synthesized by adopting a high-temperature solid-phase method, and the positive electrode material shows good electrochemical performance and can show relatively good specific discharge capacity and cycling stability under the high voltage of 2.8-4.5 V.