32273 results about "Electrolytic agent" patented technology

The invention discloses a battery monomer, a battery device and a power utilization device. Each battery monomer comprises a positive pole piece, a negative pole piece, electrolyte and an isolating membrane arranged between the positive pole piece and the negative pole piece; the electrolyte comprises a solvent and an electrolyte salt, the electrolyte salt comprises lithium bis (fluorosulfonyl) imide, and based on the total mass of the electrolyte, the mass content of the lithium bis (fluorosulfonyl) imide is 1%-6%; the solvent comprises a chain carboxylic ester solvent, and the mass content of the chain carboxylic ester solvent is 5-75% based on the total mass of the electrolyte; the negative electrode plate comprises a negative electrode current collector and a negative electrode film layer arranged on at least one side of the negative electrode current collector, the negative electrode film layer comprises a negative electrode active material, and the graphitization degree of the negative electrode active material is 90-96%; the positive pole piece comprises a positive current collector and a positive film layer arranged on at least one side of the positive current collector, the positive current collector comprises aluminum foil, and the thickness of the aluminum foil is 10-16 microns.

The invention discloses a battery monomer, a battery device and a power utilization device. Each battery monomer comprises a positive pole piece, a negative pole piece and an electrolyte; the lithium ion conductivity of the electrolyte is greater than or equal to 10 mS / cm; the negative electrode plate comprises a negative electrode current collector and a negative electrode film layer arranged on at least one side of the negative electrode current collector, the negative electrode film layer comprises a negative electrode active material, the negative electrode active material comprises a core part and a coating layer at least partially coating the surface of the core part, the core part comprises graphite, and the coating layer comprises graphite. In an R value cumulative distribution curve obtained by the negative electrode active material in a surface scanning mode of a laser microscopic confocal Raman spectrometer, an R value R50 with cumulative distribution of 50% is 0.15-0.50; in the obtained R values of the negative electrode active material, the number ratio of the R values smaller than or equal to 0.11 is smaller than or equal to 15%. The battery monomer provided by the invention has good dynamic performance and long cycle life.

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrode assembly and an electrolyte, and the electrode assembly comprises a positive pole piece and a negative pole piece; the positive pole piece comprises a positive pole current collecting part and a positive pole film layer; the positive pole film layer comprises lithium-containing phosphate with an olivine structure; the negative pole piece comprises a negative pole current collecting part and a negative pole film layer, and the negative pole film layer comprises a carbon-based material; the electrolyte comprises a carboxylic ester solvent, a first additive and fluorine-containing lithium sulfimide, and the mass content of the carboxylic ester solvent is 8%-60%; the total mass content of the first additive is 2.5%-10%, the first additive comprises 1, 3-propane sultone with the mass content larger than or equal to 0, an ethylene carbonate derivative with the mass content larger than or equal to 0 and vinylene carbonate with the mass content larger than 0, and the ethylene carbonate derivative comprises a compound shown in the formula A; the mass content of the fluorine-containing lithium sulfimide is 4%-8%. According to the invention, the rapid charging performance and the cycle performance of the battery monomer can be improved. # imgabs0 # formula A

The invention provides a control method of composite copper foil thickness control equipment, which comprises the following steps: calculating the deposition thickness of each abnormal concentration group at a future moment according to a deposition rate change rule diagram to obtain the copper layer thickness distribution of an abnormal region, and comparing the copper layer thickness distribution of the abnormal region with the thickness distribution of a normal region to obtain the thickness distribution of the abnormal region. Calculating a thickness deviation value of the abnormal area; according to the thickness deviation value, a deviation compensation algorithm is adopted, electroplating process parameters of the abnormal area are adjusted according to the size and the sign of the deviation value, and the electroplating process parameters comprise the current density and the electrolyte flow speed; and according to the optimized electroplating process parameters, performing parameter setting and adjustment on a power supply system and an electrolyte circulation system of the composite copper foil thickness control equipment, so that the composite copper foil thickness control equipment performs production according to the optimized electroplating process parameters.

The invention relates to the technical field of power supply devices, in particular to an energy-saving optimization method for an electric energy storage device, and the method comprises the steps: fusing a lithium ion battery solid-liquid phase change kinetic equation, a flow battery fluid mechanics equation and a flywheel rotor rigid-flexible coupling equation through a neural differential equation; constructing a dynamic meta-knowledge base containing cross-time scale nonlinear interaction features; performing dynamic parameter compensation on the polarization voltage hysteresis effect and the electrolyte flow resistance coupling effect by using a physical information neural network to generate a decoupled residual feature vector; according to the method, multi-physics field coupling modeling is achieved through the dynamic meta-knowledge base, and the energy efficiency optimization effect of the energy storage device is improved by combining the physical information neural network and the quantum optimization algorithm.

In order to solve the problem that an existing high-voltage lithium ion battery is insufficient in high-temperature performance and safety performance, the invention provides a cyclic carbonate-sulfate compound and application thereof, a non-aqueous electrolyte and a secondary battery, and the cyclic carbonate-sulfate compound comprises a compound as shown in a chemical formula 1, the specific rotation [alpha] of the cyclic carbonate-sulfate compound ranges from-7.982 degrees mL / (dmg) to + 7.982 degrees mL / (dmg), and the specific rotation [alpha] of the cyclic carbonate-sulfate compound ranges from-7.982 degrees mL / (dmg) to + 7.982 degrees mL / (dmg); the chemical formula 1 of the # imgabs0 # is shown in the specification. When the cyclic carbonate-sulfate compound provided by the invention is used as an electrolyte additive, a formed solid electrolyte membrane is smoother and more ordered, so that the cyclic carbonate-sulfate compound has higher high-temperature stability, especially membrane layer stability under a thermal shock condition.

The invention provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises a positive pole piece, an isolating membrane, a negative pole piece and electrolyte, and the positive pole piece, the isolating membrane and the negative pole piece are arranged in a laminated manner; the positive pole piece comprises a positive current collector and a positive active layer arranged on at least one side of the positive current collector, the negative pole piece comprises a negative current collector and a negative active layer arranged on at least one side of the negative current collector, and the positive active layer comprises lithium iron phosphate primary particles; the isolating membrane comprises a base membrane and a bonding layer, the bonding layer is of a porous continuous structure, and the bonding layer is at least arranged on one side, facing the positive electrode active layer, of the base membrane; the electrolyte comprises a first solvent, and the first solvent comprises one or more of dimethyl carbonate and linear carboxylic ester. The battery monomer has relatively good cycle performance.

The invention relates to the technical field of functional materials, in particular to a hollow multi-shell material as well as a low-temperature preparation method and application thereof, which comprises the following steps: 1) mixing a water or alcohol solution of a precursor A with an oil phase to prepare a water-in-oil emulsion, or dispersing the water solution of the precursor A into liquid drops by a spraying method; 2) freezing the emulsion or liquid drops obtained in the step 1) at low temperature to obtain ice template particles containing a precursor A; (3) adding the ice template particles obtained in the step (2) into a precursor B solution, controlling the temperature by a program, melting the ice template, and carrying out precipitation or polymerization reaction on A and B to obtain metal fluoride, carbonate or other hollow multi-shell materials; and 4) using the hollow multi-shell layer obtained in the step 3) as an electrolyte additive. The electrolyte additive can improve the viscosity of an electrolyte, improve the ionic conductivity, stabilize a solid electrolyte interface film, effectively inhibit the growth of lithium dendrites, improve the coulombic efficiency of a battery and prolong the cycle life of the battery.

The invention discloses a complex electrolyte additive for a battery, an aqueous zinc ion battery electrolyte and an aqueous zinc ion battery. The electrolyte additive is a complex containing metal complex ions; the complex is composed of a central ion and an internal ligand. The electrolyte additive can respectively form metal and alloy electrode-electrolyte interfaces on the surface of a zinc negative electrode through replacement and electrochemical reaction, and regulate and control the deposition behavior of zinc ions to inhibit the generation of zinc dendrites and accelerate deposition / dissolution kinetics, so that the service life of the zinc negative electrode is remarkably prolonged, and the rate capability is enhanced; a solvation structure of zinc ions can be regulated and controlled, side reactions such as hydrogen evolution, corrosion and passivation are slowed down, and capacity fading of the water-based zinc ion battery can be remarkably delayed when the positive electrode is coupled with a high-efficiency positive electrode; meanwhile, the aqueous zinc ion battery electrolyte additive is low in price, green, environment-friendly, high in functionality and beneficial to development of an aqueous zinc ion battery electrolyte and an aqueous zinc ion battery which are excellent in performance, safe, environment-friendly and low in cost.

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrode assembly and an electrolyte, and the electrode assembly comprises a positive pole piece and a negative pole piece; the positive pole piece comprises lithium-containing phosphate with an olivine structure; the negative pole piece comprises graphite particles; the electrolyte comprises a carboxylic ester solvent and a first additive, the thickness of the single-side negative electrode film layer is 50 microns to 75 microns, and the volume average particle size of the graphite particles is 8.5 microns to 13.5 microns; based on the mass of the electrolyte, the mass content of the carboxylic ester solvent is 8%-60%, the total mass content of the first additive is 3%-10%, the first additive comprises 1, 3-propane sultone with the mass content larger than or equal to 0, an ethylene carbonate derivative with the mass content larger than or equal to 0 and vinylene carbonate with the mass content larger than or equal to 3%, and the ethylene carbonate derivative comprises a compound shown in the formula A. According to the invention, the rapid charging performance and the cycle performance of the battery monomer under high energy density can be improved. # imgabs0 # formula A

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrolyte, a positive pole piece and a negative pole piece, the positive pole piece comprises a positive pole current collecting part and a positive pole film layer located on at least one surface of the positive pole current collecting part and containing a positive pole active material, and the positive pole active material comprises lithium-containing phosphate of an olivine structure; the coating weight of one side of the positive electrode film layer is 200mg / 1540.25 mm < 2 > to 370mg / 1540.25 mm < 2 >, the negative electrode plate comprises a negative electrode current collecting part and a negative electrode film layer which is positioned on at least one surface of the negative electrode current collecting part and contains a negative electrode active material, the negative electrode active material comprises a carbon-based material, the conductivity of the electrolyte is 13-20mS / cm, the battery monomer is subjected to constant-current discharge from a 100% state of charge (0.33 C) to 2.0 V at 25 DEG C, and a discharge platform voltage V1 is 3.19-3.235 V. According to the invention, the fast charging performance, the energy density and the cycle performance of the battery monomer can be improved.

The invention discloses a lithium iron phosphate battery. The lithium iron phosphate battery comprises a positive electrode, a negative electrode, an isolating membrane and an electrolyte, a main material of the positive electrode comprises lithium iron phosphate, and a main material of the negative electrode comprises graphite and a silicon-based material; the surface density of the positive electrode is greater than or equal to 23mg / cm < 2 >, and the surface density of the negative electrode is greater than or equal to 7.8 mg The electrolyte comprises a lithium salt, a solvent and an additive, the solvent mainly comprises ethylene carbonate and a micromolecular linear solvent, the additive comprises FEC and a negative electrode film-forming additive, and a negative electrode film-forming agent comprises vinylene carbonate and a lithium salt additive; the mass fraction of the micromolecular linear solvent is 35%-60%, the mass fraction of the fluoroethylene carbonate is M, the mass fraction of the silicon element in the negative electrode layer is W1, M is greater than or equal to 2% and less than or equal to 2 * W1, and the mass fraction of the negative electrode film-forming agent is 4%-6%. The energy density of the battery cell can be improved and the cycle life and the quick charge capacity of the battery cell are both considered by doping a silicon-based material into the negative electrode, designing a thick electrode and adjusting an electrolyte formula.

The invention relates to the technical field of sodium ion batteries, in particular to a sodium ion electrolyte, a preparation method thereof and a battery. The sodium ion electrolyte comprises an ester solvent, salts and an additive, wherein the ester solvent comprises chain carboxylic ester, chain carbonic ester and cyclic carbonic ester, and the salt comprises sodium salt. The sodium ion electrolyte provided by the invention has high low-temperature conductivity, not only can improve the low-temperature discharge capacity, but also can improve the low-temperature charging capacity, and can widen the charging window of a conventional commercial sodium battery from 0 DEG C to-30 DEG C.

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrode assembly and an electrolyte, the electrode assembly comprises a positive pole piece and a negative pole piece, the positive pole piece comprises a positive current collector and a positive film layer, the positive film layer comprises a positive active material, the positive active material comprises lithium-containing phosphate of an olivine structure, and the electrolyte is a lithium-containing lithium-containing phosphate of a lithium-containing lithium-containing lithium-containing lithium-containing lithium-containing lithium-containing lithium-containing lithium-containing lithium-containing lithium-containing lithium-containing lithium-containing lithium-containing electrolyte. The resistance of the positive pole piece is 0.1 ohm to 30 ohm, the negative pole piece comprises a negative current collector and a negative film layer, the resistance of the negative pole piece is 0.001 ohm to 0.01 ohm, the electrolyte comprises an organic solvent, the organic solvent comprises a chain ester solvent, and the mass content of the chain ester solvent in the organic solvent is 5% to 75%; the conductivity of the electrolyte at room temperature is 13 mS / cm to 20 mS / cm. The heat production amount of the battery monomer can be reduced, and the use reliability and the cycle performance of the battery monomer can be improved.

The invention provides a sodium ion battery electrolyte additive and a composition thereof, an electrolyte and a sodium ion battery containing the electrolyte. The additive is a fluorine-containing cyclic sulfate compound, the composition comprises fluorine-containing cyclic sulfate and other additives, and the fluorine-containing cyclic sulfate has a structure as shown in a formula (I): # imgabs0 # formula (I); the sodium-ion battery electrolyte comprises an organic solvent, a sodium salt electrolyte, the additive and any one composition of the additive, the sodium-ion battery comprises a positive electrode material, a negative electrode material and any one of the combined electrolyte. As the fluorine-containing additive has a relatively low HOMO energy level, the oxidation resistance of the non-aqueous electrolyte can be improved, and the electrochemical window of the non-aqueous electrolyte is widened; meanwhile, the cyclic sulfate participates in the formation of a negative electrode SEI film, so that the electrode interface is stabilized, and the impedance of the negative electrode surface can be remarkably reduced, thereby reducing the overall impedance of the battery, improving the rate capability and high-temperature performance of the battery, and prolonging the cycle life of the battery.

The invention provides a positive electrode, a low-temperature electrolyte, a low-temperature sodium-ion battery and a preparation method and application of the low-temperature sodium-ion battery, and belongs to the technical field of battery materials. The low-temperature sodium ion battery comprises a positive electrode, a negative electrode and a low-temperature electrolyte, wherein the positive electrode comprises a positive electrode active material, a binder, sodium salt containing fluorine and sulfur and conductive carbon; the positive electrode is improved by adding sodium salt containing fluorine and sulfur, sulfur / fluorine rich in anion derivatives can be formed on a contact interface of the positive electrode and an electrolyte to form a firm SEI film, the internal resistance of the battery is further reduced, and the coulombic efficiency of the battery during charging and discharging at normal and low temperatures is improved. The low-temperature electrolyte comprises an ester solvent and an ether additive, by adding the ether solvent, the physicochemical property of the electrolyte and the composition of an SEI film on a contact interface of an electrode and the electrolyte are optimized, the viscosity of the electrolyte at low temperature is reduced, the ionic conductivity is improved, and formation of the SEI film rich in sodium fluoride on the surface of a negative electrode can be promoted; and thus, the problem of low coulombic efficiency of battery charge-discharge cycle at low temperature is solved.

A negative electrode-free lithium metal battery, and a preparation method therefor and a use thereof. The negative electrode-free lithium metal battery comprises: a positive electrode, comprising a positive electrode current collector and a positive electrode active material layer containing a lithium supplementing additive; a negative electrode current collector; an electrolyte, comprising at least one boron-containing lithium salt and a fluorinated amide compound solvent; and a separator. The fluorinated amide electrolyte and the lithium supplementing additive are used in combination, so that a thin lithium layer having a dense deposition structure can be formed in situ on the negative electrode current collector when the negative electrode-free lithium metal battery is charged for the first time, and is taken as additional stored lithium to make up for irreversible lithium loss, thereby remarkably prolonging the cycle life of the negative electrode-free lithium metal battery while keeping high energy density.

The invention provides a positive electrode material and a preparation method thereof, a positive electrode plate and a battery, the positive electrode material comprises lithium manganese iron phosphate particles, a first shell layer and a second shell layer, the first shell layer and the second shell layer sequentially coat the surfaces of the lithium manganese iron phosphate particles, the material of the first shell layer comprises nanoscale SiO2 particles, and the material of the second shell layer comprises nanoscale TiO2 particles. The surfaces of the lithium manganese iron phosphate particles are sequentially coated with the SiO2 layer and the TiO2 layer, so that the contact between the lithium manganese iron phosphate particles and an electrolyte can be reduced, the side reaction between the lithium manganese iron phosphate particles and the electrolyte in the electrochemical reaction process is reduced, the cycle life attenuation of the battery is relieved, the dissolution of Mn element is reduced, and the service life of the battery is prolonged. Therefore, the battery impedance increase caused by deposition of Mn < 2 + > on the negative electrode in the circulation process is relieved.

The invention provides a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrode assembly and an electrolyte, the electrode assembly comprises a first pole piece and a second pole piece, each of the first pole piece and the second pole piece comprises a coating part and a tab, the coating part is coated with an active material layer, and the tab is not coated with the active material layer; one of the first pole piece and the second pole piece is a positive pole piece, and a positive active material of the positive pole piece comprises lithium-containing phosphate with an olivine structure; the coating part of the first pole piece comprises a first straight section, the coating part of the second pole piece comprises a second straight section, the first straight section and the second straight section are stacked in the thickness direction of the electrode assembly, and the ratio of the number of the tabs of the first pole piece to the number of the first straight sections of the first pole piece is 0.5-2; an organic solvent of the electrolyte comprises a chain carboxylic ester solvent, and the mass content of the chain carboxylic ester solvent in the organic solvent is 8-90%. The use reliability and the cycle performance of the battery monomer can be improved.

The invention relates to the technical field of batteries, in particular to a battery. The battery comprises a diaphragm and an electrolyte, the diaphragm comprises a carrier layer and a coating, the coating comprises first particles, the components of the first particles comprise an ester group-containing polymer, and within the area of 100 [mu] m * 100 [mu] m of the surface of the coating, the number of primary particles of the first particles with the particle size smaller than or equal to 0.3 [mu] m accounts for 0.01%-4% of the number of the primary particles of the first particles; the electrolyte comprises cyclic carbonate and fluoroethylene carbonate, the weight ratio of the fluoroethylene carbonate in the electrolyte is 13%-50%, and the weight ratio of the cyclic carbonate to the fluoroethylene carbonate is (0.2-1.5): 1. According to the battery disclosed by the invention, a relatively stable and flexible SEI film is formed on the surface of the negative plate through synergistic cooperation of the diaphragm and the electrolyte, so that the interface stability between the diaphragm and the negative plate is improved, and the high-temperature long-cycle performance of the battery is improved.

Provided in the present application are a lithium secondary battery and an electric device. The lithium secondary battery comprises an electrolyte and a negative electrode sheet, wherein the electrolyte comprises a chain carboxylic ester and a cyclic carbonate, and the negative electrode sheet comprises a negative electrode current collector and a negative electrode film layer located on at least one side of the negative electrode current collector. Based on the total mass of the electrolyte, the mass content W1 of the chain carboxylic ester and the mass content W2 of the cyclic carbonate satisfy: 0.1≤W2 / W1≤2, and the mass content W1 of the chain carboxylic ester and the thickness H of the negative electrode film layer satisfy: 0.2≤H / 100W1≤20, with the unit of H being μm. The lithium secondary battery has good fast charging performance and cycling performance.

The invention discloses a lithium manganese iron phosphate positive electrode material with a core-shell structure, which is prepared by the following steps: mixing a manganese source, an iron source, a phosphorus source, lithium carbonate and a carbon source, grinding and drying to prepare a pre-sintered material; then carrying out gas crushing on the pre-sintered material to obtain a pre-gas crushed material, and carrying out heat preservation at the temperature of 200-600 DEG C; putting the pre-gas crushed material subjected to heat preservation into an iron salt solution for quenching reaction to obtain iron compound coated lithium manganese iron phosphate; and finally, mixing the lithium iron manganese phosphate coated with the iron compound, a lithium source, a phosphorus source and a carbon source, grinding, drying, and carrying out secondary calcination to obtain the lithium iron manganese phosphate material with the core-shell structure. During preparation of the lithium manganese iron phosphate positive electrode material, a lithium manganese iron phosphate pre-sintered body and an iron salt solution are subjected to a quenching reaction to form an iron compound coated lithium manganese iron phosphate pre-sintered body, and then the iron compound coated lithium manganese iron phosphate pre-sintered body and other raw materials of lithium iron phosphate are subjected to a secondary calcination reaction to generate the composite positive electrode material with a core-shell structure. A coating structure is formed, the reaction between manganese and electrolyte is reduced, the dissolution of manganese is inhibited, the Gingtaler effect of manganese is relieved, and the stability of the material is improved; and the material has the advantages of high energy density, high power density, excellent cycle performance and strong core-shell interface bonding force.

The invention provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises an electrode assembly, wherein the electrode assembly comprises a positive plate, a negative plate and a non-aqueous electrolyte; the positive plate comprises a positive current collector and a positive film layer, and the negative plate comprises a negative current collector and a negative film layer; the positive electrode film layer comprises a positive electrode active material, and the positive electrode active material comprises a lithium manganese iron phosphate material and a nickel cobalt lithium manganate material; in the nickel cobalt lithium manganate material, the molar ratio of Ni in the sum of the three elements of Ni, Co and Mn is 0.5-0.95; the non-aqueous electrolyte comprises vinylene carbonate, and the mass content of the vinylene carbonate in the non-aqueous electrolyte is 0.5%-2%; the non-aqueous electrolyte comprises at least one of linear carbonic ester and linear carboxylic ester, and the conductivity of the non-aqueous electrolyte is 9-14 mS / cm. The energy density, the cycle performance and the power performance of the battery monomer are improved at the same time.

The invention provides a sodium-ion battery positive electrode material and a preparation method thereof, a sodium-ion battery and electric equipment, and relates to the field of sodium-ion batteries. The positive electrode material of the sodium ion battery provided by the invention comprises an inner core and a shell, wherein the shell covers the inner core; the chemical formula of the inner core is NaaNixFeyMnzM1-x-y-zO2, wherein a is more than or equal to 0.9 and less than or equal to 1.05, x is more than 0 and less than 1.0, y is more than 0 and less than 1.0, z is more than 0 and less than 1.0, and 1-x-y-z is more than 0 and less than 1; the chemical formula of the shell is NaLarCa1-rO2, wherein r is more than 0 and less than 1; in the inner core, the element M comprises one or more of Al, Mg, Ti, Zr, Y, La, Ca, Zn, Cu, W, Li and B. The sodium-ion battery positive electrode material provided by the invention can reduce residual alkali on the surfaces of particles, can inhibit side reaction with an electrolyte, and improves the performance stability of the positive electrode material.

The invention provides an electrolyte, an electrochemical device and an electronic device, the electrolyte comprises lithium bis (fluorosulfonyl) imide, a sulfur-containing compound and propyl propionate, based on the mass of the electrolyte, the mass percentage content of the lithium bis (fluorosulfonyl) imide is A%, the mass percentage content of the sulfur-containing compound is B%, the mass percentage content of the propyl propionate is D%, B / A is greater than or equal to 0.3 and less than or equal to 4, and D is greater than or equal to 30 and less than or equal to 40. Through the arrangement, the risk that the alternating current impedance of the electrochemical device is increased under high voltage is reduced, and the anti-falling performance and intermittent cycle performance of the electrochemical device are improved.

The invention discloses an electrolyte, a battery monomer, a battery and an electric device, and belongs to the technical field of batteries. A first additive and a second additive are added into the electrolyte, the first additive comprises fluorophosphate and / or borate, and the second additive comprises an ethylene sulfate compound. The first additive and the second additive are beneficial to formation of a stable SEI film on the surface of the negative electrode active material by the electrolyte, and contact between the electrolyte and the surface of the negative electrode active material can be blocked, so that further side reaction on the negative plate side is inhibited. Meanwhile, the first additive can be combined with metal ions on the surface of the positive electrode active material to form ionic bonds, so that the phenomenon of excessive lithium removal on the surface of the positive electrode active material is reduced, the occurrence of damage to the structure of the positive electrode active material is effectively reduced, and the side reaction of the electrolyte on the positive plate side is reduced. By reducing side reaction of the negative plate side and the positive plate side with electrolyte, the service life of the battery is prolonged.

The invention relates to the technical field of lithium metal batteries, in particular to a flame-retardant in-situ polymerization gel electrolyte battery and a preparation method thereof.The flame-retardant in-situ polymerization gel electrolyte battery comprises a positive plate, a negative plate, a diaphragm and gel electrolyte; the gel electrolyte is mainly formed by mixing a liquid electrolyte, a polymeric monomer, a cross-linking agent, a flame retardant and an initiator and then performing in-situ polymerization. A polymeric monomer and a cross-linking agent are subjected to a thermally-initiated in-situ free radical polymerization reaction, a spatial net-shaped structure is formed through a cross-linked molecular chain, and the polymer is filled with a liquid electrolyte and a flame retardant, so that the gel electrolyte with a flame-retardant effect is obtained and is applied to a lithium metal battery; and the interface stability and cycle stability between the electrolyte and the positive / negative electrode can be enhanced. Meanwhile, the mechanical property of the gel electrolyte can be adjusted and improved by utilizing the polymeric monomer, so that a solid-solid contact interface in the battery can be improved; moreover, through component optimization, the ionic conductivity of the gel electrolyte can be improved, and rapid transmission of lithium ions is facilitated.

The invention provides a secondary battery and an electronic device comprising the same, the secondary battery comprises a positive pole piece, a negative pole piece, an isolating membrane and an electrolyte, and the electrolyte comprises a compound as shown in a formula I; based on the total mass of the electrolyte, the mass percentage content of the compound shown in the formula I is A%, and A is larger than or equal to 0.01 and smaller than or equal to 50; the positive pole piece comprises a positive active material, the positive active material comprises lithium cobalt oxide, the lithium cobalt oxide comprises an element M, and the element M comprises at least one of Al, Mg, Ti, Nb, Cr, Y, Sr or Zr; based on the total mass of the positive electrode active material, the mass percentage of the M element is B%, and 0.01 < = B < = 1. In the secondary battery, the electrolyte comprises the compound shown in the formula I, the positive electrode active material comprises the lithium cobalt oxide containing the M element, and the values of A and B are regulated and controlled in the range, so that the formation of a low-impedance CEI film is facilitated, and the secondary battery has good high-temperature storage stability and low-temperature discharge performance at the same time.

The invention discloses a lithium battery diaphragm coating based on a nano material and application thereof, and relates to the technical field of lithium battery diaphragms. The coating comprises the following raw materials in parts by weight: 15-25 parts of polystyrene maleic anhydride copolymer modified polyvinylidene fluoride, 10-20 parts of polystyrene, 2-4 parts of nano silicon nitride, 3-6 parts of a boehmite / aluminum oxide and silicon dioxide composite material, 1-2 parts of a dispersing agent and 65-90 parts of a solvent, according to the lithium battery diaphragm coating provided by the invention, the wettability and absorptivity of a diaphragm to an electrolyte are remarkably improved, meanwhile, the lithium battery diaphragm coating also has excellent thermal stability, and the diaphragm can be effectively prevented from thermal shrinkage or melting under a high-temperature condition, so that the safety performance of a battery is remarkably enhanced.

The invention provides a water electrolysis hydrogen production monitoring and control method with dynamic fluctuation adaptability, and relates to the technical field of hydrogen production. Comprising the steps that a multi-dimensional operation parameter set of an electrolytic cell is collected in real time through a multi-source sensor array, an electrolysis process prediction model is established based on the LSTM and the CNN neural network, and therefore the prediction result of the electrolysis state is determined. And according to the prediction result, a dynamic parameter adjustment matrix is constructed, and the electrolytic current density, the electrolyte concentration and other key parameters of the electrolytic cell are adjusted for the first time through fuzzy PID control. After adjustment, the multi-dimensional operation parameter set is updated, the health degree index of the electrolytic cell is calculated, and the relation between the index and a preset health index threshold value is monitored in real time. And second-time adjustment is carried out according to the monitoring result, so that safe and efficient operation of the electrolytic cell under the dynamic fluctuation condition is ensured. The problems that in the prior art, an electrolytic cell is slow in response to load change, insufficient in monitoring capacity, dependent on manual maintenance and the like are effectively solved.