48results about How to "High capacity density" patented technology

The invention discloses a high-capacity positive electrode electrolyte for all-vanadium liquid flow batteries, wherein the electrolyte contains a solid energy storage material with a concentration of 0.02-1 g / mL, and the main component is a targeted redox solid energy storage material containing ammonia-rich iron / copper ferrocyanide, which reacts with a positive electrode redox medium VO in a supporting electrolyte containing ammonium ions. 2+ / VO2 + With similar equilibrium potential, reversible redox reaction can occur to continue the charge and discharge process. The high-capacity all-vanadium liquid flow battery positive electrode electrolyte disclosed in the present invention uses low-cost solid energy storage materials as the main energy storage medium, so when using a lower positive electrode redox medium VO 2+ / VO2 + High capacity and energy can be achieved at low concentrations, and pentavalent vanadium VO2 + The concentration can enhance the temperature adaptability of the all-vanadium liquid flow battery system while reducing the electrolyte cost.

The invention discloses an additive for modifying a lithium battery positive electrode material and a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The problems that an existing lithium battery positive electrode material is unstable in air, high in total alkali residue and poor in high-temperature stability, and active lithium is consumed due to long circulation are solved. The expression of the additive is LiaMgbMec( PO4) dYe, Me represents a transition metal element, Y represents an anion, a is greater than 0 and less than or equal to 2, b is greater than 0 and less than or equal to 1.5, c is greater than or equal to 0 and less than or equal to 0.4, d is greater than 0 and less than or equal to 1, and e is greater than or equal to 0 and less than or equal to 0.4. The additive is rich in magnesium, so that the positive electrode material can provide effective structural support during lithium ion intercalation / deintercalation, and high-temperature cycle stability is provided; by doping the transition metal element, irreversible lithium loss caused by formation of an SEI film can be counteracted during intercalation / deintercalation of lithium ions, so that the total capacity and the energy density of the battery are improved; the added anion group can reduce the residual alkali of the positive electrode material and reduce the gas production of the lithium battery under high voltage.

The invention relates to the technical field of capacitor electrode material preparation, in particular to a sulfur-doped nickel-manganese layered double hydroxide electrode material, a preparation method and a capacitor, and the preparation method comprises the following steps: growing sulfur-doped nickel-manganese layered double hydroxide on foamed nickel by using a simple and feasible one-step hydrothermal method; oxygen vacancies are introduced into the electrode material through a safe and harmless chemical reduction method; wherein the layered double hydroxide has a relatively large specific surface area and rich active sites, so that permeation of electrolyte and diffusion of ions are facilitated; through combination of sulfur doping and oxygen vacancy, the electronic structure of the electrode material can be synergistically optimized, and the electrolyte adsorption capacity and the electronic conductivity of the electrode material are enhanced. The problems that in the prior art, due to the fact that transition metal layered double hydroxides are low in electric conductivity and poor in electron transmission efficiency, actual energy density and power density are low, and cycling stability is poor are solved.

The invention relates to a preparation method of a dry-process thick pole piece, which specifically comprises the following steps: stirring and mixing active material powder, a binder and a conductive agent under the condition that the temperature is controlled to be less than or equal to 18 DEG C to obtain a premix; the obtained premix is subjected to rapid shearing, the temperature is increased to be smaller than or equal to 180 DEG C, and fiberized powder is obtained after the specified temperature is reached; carrying out one-time double-roller hot pressing on powder obtained after fibration to continuously form a film, continuously passing the formed film through double rollers, carrying out hot pressing and thinning, and then rolling to obtain a dry-method electrode film; the obtained dry-method electrode diaphragm and a current collector are subjected to continuous double-face covering through double-roller hot pressing, and a dry-method electrode thick electrode roll is obtained after rolling; the method has the advantages that effective transmission of lithium ions and electrons in the electrode is promoted, and the thick and compact electrode with uniform binder distribution is prepared.

The invention provides a positive electrode material and a preparation method thereof, a positive electrode plate, a sodium ion battery and a power utilization device, and belongs to the field of batteries, the positive electrode material comprises an inner core and a carbon-containing coating layer covering at least part of the surface of the inner core, and the inner core contains sodium vanadium fluorophosphate; the positive electrode material is adopted to prepare the button cell, the Nth charge-discharge test is performed on the button cell, and in a discharge curve of the Nth charge-discharge test, the discharge specific capacity is C0, and the total discharge specific capacity of a discharge platform corresponding to the voltage of 3.3-3.4 V is C1, C1 / C0lt; n is an integer greater than or equal to 1; the condition of the Nth charge-discharge test is as follows: at 20-30 DEG C, the button cell is charged to 4.3 V at 0.2 C multiplying power constant current, and then is discharged to 2V at 0.2 C multiplying power constant current. The positive electrode material provided by the invention has relatively high specific discharge capacity and electronic conductivity.

The invention relates to the technical field of batteries, in particular to a negative electrode active material, a secondary battery and electric equipment.The negative electrode active material has the advantages that under the combined action of metal sulfide distributed in pores of a carbon matrix and a shell layer which is distributed on the surface of the carbon matrix and contains non-metal vanadium compounds, the negative electrode active material is formed; according to the present invention, the specific capacity and the rate capability of the negative electrode active material can be significantly improved, the compaction density of the pole piece can be easily improved, the structural stability of the battery can be significantly improved, the rapid charging and discharging can be achieved, the battery capacity attenuation under the high rate condition can be slowed down, and the cycle life can be prolonged.

The present application provides a low-expansion silicon negative electrode material, including porous carbon, nano-silicon, conductive carbon and ion conductor material, wherein the pores of the porous carbon include open pores and closed pores; taking the total number of the open pores and the closed pores as 100%, the number of the open pores accounts for 80-99.9%. The porous carbon provides a continuous conductive channel, the closed pores can buffer part of the volume expansion, and the open pores are used to accommodate the nano-silicon material, and some pores are reserved to further alleviate the volume expansion and ensure the low expansion rate of the material; the nano-silicon ensures the high specific capacity of the material, the conductive carbon further improves the electronic conductivity of the material, and the ion conductor can provide more ion-conducting channels, while isolating the electrolyte and preventing the occurrence of side reactions. The silicon negative electrode material provided in the present application has a low expansion rate and excellent cycle and rate performance.

The present application relates to an electrolyte and an electrochemical device comprising the electrolyte. The electrolyte comprises a dinitrile compound, a trinitrile compound, and propyl propionate, wherein, based on the total weight of the electrolyte, X is a weight percentage of the dinitrile compound and Y is a weight percentage of the trinitrile compound, and Z is a weight percentage of the propyl propionate; 2 wt% < (X+Y) ≤ 8 wt%, 0.1 ≤ (X / Y) ≤ 6, 2 wt% < X ≤ 6 wt%, 30 wt% ≤ Z ≤ 50 wt%, and 0.01 ≤ (Y / Z) ≤ 0.3.

This utility model relates to the field of cylindrical battery technology and proposes a lithium-ion cylindrical secondary battery, including a housing, a gasket, and a rubber ring. The housing has a protrusion inside; the gasket is disposed inside the housing and abuts against the bottom side of the protrusion; the rubber ring is fixedly disposed on the positive electrode cap and spaced above the gasket, with a minimum distance H between the gasket and the rubber ring. 41 The end face radius of the lithium-ion cylindrical secondary battery is R1, H 41 / R1 = 3.6% - 5.5%. This utility model, by reasonably setting the distance between the gasket and the rubber ring, not only makes the gasket more compact with the positive electrode cap and rubber ring, improving the battery capacity and energy density, but also avoids interference and collision between the gasket and the positive electrode cap and rubber ring during assembly, reducing the assembly difficulty of the battery and thus effectively improving the overall performance of the battery.

The utility model relates to the technical field of batteries, in particular to a collector plate, a cover plate assembly and a cylindrical battery. The collector plate comprises a plate body and a connecting part, a connecting groove is formed in the plate body, one end of the connecting part is connected into the connecting groove, the connecting part has a first bending state and a second bending state relative to the plate body, when the connecting part is in the first bending state, the connecting part is separated from the connecting groove, and when the connecting part is in the second bending state, the connecting part is separated from the connecting groove. And when the connecting part is in the second bending state, the connecting part can be completely accommodated in the connecting groove. And the connecting part is configured to be capable of being bent towards the direction close to the tray body, so that the connecting part is converted from the first bent state to the second bent state. The cover plate assembly comprises the flow collecting disc. The cylindrical battery comprises the cover plate assembly. The current collecting disc and the cover plate assembly are light and thin in structure, and the cylindrical battery has higher battery capacity.

The invention discloses a graphene / sulfur / silicon multi-component composite material for manufacturing a battery electrode, a preparation method and a battery, and belongs to the technical field of batteries, the graphene / sulfur / silicon multi-component composite material is a multi-component composite material taking graphene as a substrate to load nano sulfur and nano silicon; in the multi-component composite material, nano-silicon is deposited on the surface layer of graphene, and nano-sulfur is uniformly crystallized to the surfaces of nano-silicon particles and among the particles. According to the graphene / sulfur / silicon multi-component composite material and the preparation method thereof, the respective advantages of the composition materials are exerted through a material compounding technology, the defects of a single material are overcome, and the prepared graphene / sulfur / silicon multi-component composite material has the advantages of high charge-discharge capacity, long cycle life, good rate capability and the like.

The invention provides a method for prolonging the cycle life of a conversion reaction positive electrode battery based on large-current pulse activation. According to the invention, a conventional low-current constant-current activation mode is replaced by a specific charge-discharge system activation method for the conversion reaction positive electrode battery; a conversion reaction positive electrode is repeatedly stimulated, a product is regulated and controlled to be uniformly nucleated, a stable reaction interface is formed, a homogeneous reaction of the product is smoothly realized, a diffusion barrier of a two-phase product reaction is reduced, and a discharge product is promoted to be fully converted into an active substance material; and the volume expansion of the pole piece is effectively inhibited, so that the problems of capacity attenuation and unstable cycle performance of a conversion reaction positive electrode battery caused by inactivation, falling and passivation of active substances are improved. Besides, compared with a traditional low-current activation system, the charging and discharging system provided by the invention shortens the time and can promote the battery to quickly reach the optimal performance state, so that the commercialization value is further improved for the application of the battery.

The present application provides a negative electrode material and a preparation method and application thereof, wherein the negative electrode material comprises a silicon-based material core and a coating layer at least partially coated on the surface of the silicon-based material core, and the first charging expansion coefficient, the first discharging expansion coefficient, the second charging expansion coefficient, and the second discharging expansion coefficient of the negative electrode material meet the following conditions: 0.016≤≤0.025; 0.020≤≤0.030; 0.0008≤≤0.002; 0.003≤≤0.0036. Based on the negative electrode material of the present application, the problem of poor capacity and energy density and low initial efficiency of lithium-ion batteries in the prior art is solved.

The invention discloses a flexible electrode film and a preparation method and processing equipment thereof, and belongs to the technical field of electrochemistry and environmental engineering. The thickness of the flexible electrode film is 40-1000 [mu] m, the flexible electrode film is provided with a fiberized three-dimensional network, an active material is adhered in the fiberized three-dimensional network, the interior of the flexible electrode film is also provided with a pore structure which is distributed with the fiberized three-dimensional network in a mutually interlaced manner, the pore structure is composed of a plurality of pores, and the pores are distributed in an interlaced manner. And the holes are in through or semi-through pore morphology. Soluble salt is introduced as a temporary structure regulation component, a uniformly distributed pore structure is formed in the electrode after subsequent removal, ion transmission conditions in the thick electrode are improved, and the utilization rate of active substances is increased. The fiberized three-dimensional network structure and a pore structure formed by salt pore forming cooperate with each other, so that the electrode achieves higher effective capacity and energy density in a unit area.

The present application proposes an electrode and a preparation method thereof, an electrochemical device and an electronic device, wherein the electrode comprises a current collector and an active material layer located on one side or both sides of the current collector; along the thickness direction of the active material layer, the active material layer is divided into four parts, each part being a detection area, and a thermogravimetric analysis is performed on the detection area at a heating rate of 10°C / min under an inert atmosphere. The results of the thermogravimetric analysis show that the mass percentage of weight loss in the detection area from 200°C to 800°C gradually increases with the decrease in the spacing distance between the detection area and the current collector in the thickness direction, thereby increasing the overall conductivity of the active material layer, thereby improving the overall conductivity of the electrode, which is beneficial to increasing the thickness of the electrode, and further beneficial to increasing the capacity and energy density of the electrochemical device using the electrode.

The present disclosure provides a soft package battery and an electric device, the soft package battery comprises a battery body and a protection plate, the battery body comprises an encapsulation body and an electrode core, the encapsulation body only comprises a main body part and an end part; the protection plate comprises a first surface and a second surface, the second surface is closer to the end surface of the main body part than the first surface, the first surface is farther away from the end surface of the main body part than the bending segment, the shortest distance between the first surface and the bending segment is D1, the shortest distance between the second surface and the end surface of the main body part is D2, 0.05mm≤D1≤1mm, 0.05mm≤D2≤0.5mm. Compared with the related art, the length space that is left after removing the unsealed part and the tab glue can be used by the electrode core body, and the battery capacity and energy density are improved by increasing the length of the electrode core main body.

The present invention discloses a method for constructing Ni / SnS2@Ni(OH)2 using a carbon cloth template, which is specifically implemented according to the following steps: Step 1, preparing a Ni-doped SnS2 nanosheet array; Step 2, preparing Ni / SnS2@Ni(OH)2; the method of the present invention is simple and of low cost; the prepared supercapacitor positive electrode material has a high area specific capacity and power density, and exhibits good electrochemical properties; and the Ni / SnS2@Ni(OH)2 material is synthesized for the first time, which is innovative; it has good electrochemical properties and is practical.

The utility model relates to the technical field of batteries, in particular to a connecting piece, a circuit board and a battery. The connecting piece comprises a tab welding part, a connecting part and a plate welding part. The tab welding part comprises a first welding section, a bending section and a second welding section which are connected in sequence, the second welding section is connected with the plate welding part through a connecting part, the first welding section and the second welding section are folded through the bending section so that the tab can be clamped between the first welding section and the second welding section, and the second welding section is located on one side in the width direction of the circuit board; the board welding part is used for being welded to one side of the circuit board in the thickness direction. According to the connecting piece provided by the utility model, the size of the connecting piece in the height direction can be reduced as much as possible under the condition that the connecting strength is ensured, so that a space is provided for a larger battery cell to enlarge the capacity density of the battery, the ultimate miniaturization of the battery can be realized, and the application range of the battery is expanded.

The invention provides a sodium-supplementing diaphragm, a preparation method and application thereof and a sodium-ion battery, and belongs to the technical field of sodium-ion batteries. According to the invention, the base film layer is used as the basis of the sodium-supplementing diaphragm, and the protective layer is arranged to maintain the stability and insulativity of the sodium-supplementing diaphragm, so that the puncture effect of burrs and compounds generated in the battery cell manufacturing process and the charging and discharging process on the diaphragm is reduced, and the risk of positive and negative electrode contact short circuit is reduced; sodium ions are dissociated through the sodium supplementing layer, sodium loss of the battery in the using process is made up, and then the first coulombic efficiency, the charge-discharge capacity and the energy density of the sodium ion battery are effectively improved; through mutual cooperation of the oxygen absorption layer and the sodium supplementing layer, by-product gas and solid of the sodium supplementing layer are adsorbed, side reaction products generated by electrolyte are adsorbed, decomposition of an SEI film is prevented, gas production is reduced, and the cycle performance and safety performance of the battery are further improved.

The invention provides micron silicon slurry, micron silicon carbon negative electrode slurry, a preparation method of the micron silicon carbon negative electrode slurry, a negative electrode plate, a lithium ion battery and electric equipment, and relates to the field of lithium ion batteries. The micron silicon slurry comprises the following raw materials in parts by weight: 3-7 parts of a lithium supplementing binder, 0.3-1 part of a dispersing agent, 4 parts of micron silicon powder and 88.7-95 parts of a solvent, the lithium-supplementing binder comprises a polyacrylic acid-based polymer containing carboxyl functional groups and lithium. Different from the powder form of the traditional silicon-based negative electrode, the invention directly provides the micron silicon slurry, the micron silicon slurry can be directly applied to the current negative electrode slurry mixing process, and the dispersing agent and the lithium-supplementing binder are added, so that the lithium-supplementing effect is improved. When the micron silicon slurry is used, the problems of dispersion difficulty and bonding strength of micron silicon do not need to be considered too much.

A method for manufacturing a battery includes: a first cutting step of cutting a laminate at a first cutting position to form a first cut surface, the laminate including at least one battery cell having a positive electrode layer, a negative electrode layer, and a solid electrolyte layer located between the positive electrode layer and the negative electrode layer; and a second cutting step of cutting the laminate cut in the first cutting step at a second cutting position inside the first cutting position to form a second cut surface. In the second cutting step, Rz1 < W < 5Rz1 is satisfied, where W denotes a distance between the first cut surface and the second cut surface to be formed and Rz1 denotes a surface roughness of the first cut surface.

The application discloses a kind of supercapacitor negative high-efficiency composite electrode and preparation method thereof, including the block body iron of substrate and the outer layer PrNi x Fe 1‑x O3 conductive active layer, and Fe2O3 active layer between the two, by wet chemical etching and transient high temperature joule heat method in-situ synthesis active layer, and further utilize wet chemical brush coating and transient high temperature joule heat method in-situ synthesis conductive active layer, two are asymmetric sandwich structure, it is favorable to build charge transport path, improve charge transport efficiency, at the same time, can effectively relieve the volume change generated in the process of charge and discharge of iron oxide, unlike the characteristics of particle composite structure easy to collapse, inhibit the occurrence of electrode material pulverization, wherein, using transient high temperature joule heat preparation technology, layered in-situ build heterostructure, not only simple and fast, also make the structure compact and dense, maintain the stability of overall electrode structure, improve the long-period cycle charge and discharge capacity of electrode.

The invention discloses a hollow porous positive electrode material precursor, a preparation method thereof and a lithium ion battery. The hollow porous positive electrode material precursor provided by the invention comprises a hollow core and a porous shell, and the surface of the porous shell contains hydroxyl. The inner core of the hollow porous positive electrode material precursor has a high cavity structure, and the shell has more highly open three-dimensional pore channels, so that the lithium ion propagation path can be shortened to a certain extent, and the discharge capacity and the energy density at the hollow porous positive electrode material end can be improved. In addition, after the surface of the porous shell is subjected to hydroxylation modification, metal active sites can be increased, and intercalation and deintercalation of lithium ions are enhanced.

The invention provides an ammonium / phosphorus-based electrolyte, and belongs to the technical field of aqueous zinc ion batteries, the electrolyte comprises a zinc salt, water, an organic solvent and an organic salt additive, the zinc salt comprises zinc sulfate, the organic solvent comprises ethylene glycol and / or N, N-dimethylformamide, and the organic salt additive comprises sodium hydroxide and sodium hydroxide. The organic salt additive is prepared from at least one of 3-bromopropyl trimethyl ammonium bromide, tetrapropyl ammonium bromide and methyl triphenyl phosphorus bromide; in the electrolyte, the concentration of the zinc salt is 1-3 mol / L, and the concentration of the organic salt additive is 0.1-0.3 mol / L. The electrolyte can successfully excite and stabilize high-reversible four-electron redox reaction of the zinc-iodine battery from I <-> to I < + >, so that the specific capacity, the electrode potential, the energy density and the cycle performance of the zinc-iodine battery are remarkably improved. The invention also provides a preparation method of the ammonium / phosphorus-based electrolyte and application of the ammonium / phosphorus-based electrolyte in preparation of an aqueous zinc-iodine battery.

A positive electrode active material for a secondary battery includes a lithium metal composite oxide having a crystal structure based on a rock-salt structure belonging to a space group Fm-3m. The lithium metal composite oxide contains a first metal element other than Li, and a second metal element other than Li and the first metal element. The first metal element is at least one selected from the group consisting of Gd, Ce, Eu, Sm, and Yb.

The invention provides a sodium vanadium phosphate positive electrode material with high capacity and multiplying power, which belongs to the technical field of lithium batteries, the chemical formula of the sodium vanadium phosphate positive electrode material is Na < 3-x > M < x > V < 2-y > Ny (PO4) 3, and the value range of x in the chemical formula is 0 lt; x is smaller than or equal to 0.4, and the value range of y is 0 lt; y is less than or equal to 0.8, M is a combination of K and L or one of K and L , and N is one or more of Mn, Fe, Co and Ni. The prepared two-site co-doped high-capacity sodium vanadium phosphate positive electrode material has better structural stability, larger-radius ions are doped into crystals to increase the unit cell volume, and as supporting ions, the structure irreversible damage caused by phase change is reduced, and the performance of the positive electrode material is improved. And the specific capacity under high magnification is improved, and meanwhile, a better capacity retention ratio is obtained.

This invention provides a thick electrode, its preparation method, and its applications. The thick electrode includes a current collector and at least two electrode layers located on the surface of the current collector. An electrospun layer is disposed between the electrode layers. The active material in the electrode layer closer to the current collector surface is a large-particle-size active material, while the active material in the electrode layer farther from the current collector surface is a small-particle-size active material. This invention improves the electrode loading and thickness by designing at least two electrode layers and optimizing the particle size distribution of the main active material in each layer, thereby increasing the specific capacity and energy density of the battery. Simultaneously, the electrospun layer connects the electrode layers, creating a porosity gradient distribution along the direction perpendicular to the electrode, constructing efficient ion diffusion and conduction channels and electron transport channels. This results in good ion diffusion and conduction, reduces polarization during charging and discharging, and ensures high energy density and power performance of the battery.

The invention relates to the technical field of chemical batteries, in particular to an aluminum ethoxide composite polymer electrolyte membrane, a preparation method of the aluminum ethoxide composite polymer electrolyte membrane, application of the aluminum ethoxide composite polymer electrolyte membrane in a battery and an assembly process of the battery. The aluminum ethoxide composite polymer electrolyte membrane comprises a polymer and aluminum ethoxide, the structure of the polymer contains ester groups or / and ether bonds; the polymer is polyethylene oxide or a polyethylene oxide derivative; the polyethylene oxide derivative is obtained by carrying out photopolymerization on a small molecular monomer. When the aluminum ethoxide composite polymer electrolyte membrane is applied to a battery, the interfacial compatibility is enhanced, rapid and ordered transmission can be realized, and the cycling stability is good.

The invention discloses a lithium-rich manganese-based layered positive electrode material, a preparation method and application. The lithium-rich manganese-based layered positive electrode material provided by the invention contains a lithium-oxygen-vacancy configuration, and the vacancy is located in the transition metal layer. The preparation method of the lithium-rich manganese-based layered positive electrode material is simple, convenient and rapid, the requirement on production equipment is low, and commercial production is easy to realize; more importantly, a lithium-oxygen-vacancy configuration is introduced into the lithium-rich manganese-based layered positive electrode material, and more oxygen can be excited to participate in oxidation reduction, so that the capacity and the energy density of the material are improved.

The invention provides a negative electrode material, a preparation method and a sodium ion battery. The negative electrode material provided by the invention comprises hard carbon, a carbon coating layer coating the hard carbon and closed pores, the closed pores are formed by pore openings formed by coating the carbon coating layer on the outer surface of the hard carbon, the pore diameter of the closed pores ranges from 0.1 nm to 3 nm, and the specific surface area A and the true density B of the negative electrode material meet the condition that A * B is less than 8, the specific surface area A of the negative electrode material is 0.5 m < 2 > / g-6m < 2 > / g, and the true density B of the negative electrode material is 0.5 g / m < 3 >-1.45 g / m < 3 >. A large number of closed pores of the negative electrode material can be used as sodium storage positions, namely, the negative electrode material has high closed pore volume, and the negative electrode material has high gram volume due to low true density and high closed pore volume, so that the energy density of the sodium ion battery is improved.