4084results about "Active material electrodes" patented technology

A protective structure for use with metallic lithium (or other alkali or alkali earth metals) and its method of manufacture are provided. The protective structure may include a substantially continuous and substantially nonporous buffer layer disposed on the metallic lithium layer which is conductive to lithium ions. A substantially continuous and substantially nonporous protective layer may be disposed on the buffer layer.

Embodiments described herein relate generally to systems and methods for continuously and / or semi-continuously manufacturing semi-solid electrodes and batteries incorporating semi-solid electrodes. In some embodiments, the process of manufacturing a semi-solid electrode includes continuously dispensing a semi-solid electrode slurry onto a current collector, separating the semi-solid electrode slurry into discrete portions, and cutting the current collector to form a finished electrode.

The invention provides a zinc negative electrode and gel electrolyte integrated structure and a preparation method thereof and a zinc ion battery, the integrated structure comprises a zinc negative electrode and a gel electrolyte layer combined on the surface of one side or two sides of the zinc negative electrode in situ, the gel electrolyte layer comprises a polymerization product of a zinc acrylate monomer, an acrylic monomer and a gel substance, the zinc ion battery has the advantages of no anion interference, high ionic conductivity, excellent contact with a zinc negative electrode and the like, can be applied to the field of batteries, and can effectively avoid an electrode concentration polarization effect, enhance the desolvation capability of zinc ions and prolong the cycle life of the batteries. The preparation method comprises the following steps: arranging a mixed raw material solution containing a zinc acrylate monomer, an acrylic monomer and a gel substance on the surface of the zinc negative electrode, and carrying out ultraviolet polymerization to generate a single-ion conductive dual-network polymer, namely the gel electrolyte layer, on the surface of the zinc negative electrode in situ. The method is suitable for industrial production.

The invention provides a carbon-coated lithium-containing phosphate positive electrode material and a preparation method thereof, a positive electrode plate and a lithium ion battery, and relates to the technical field of lithium ion batteries. Particles of the carbon-coated lithium-containing phosphate positive electrode material provided by the invention have a composite structure, the composite structure comprises a lithium-containing phosphate inner core and a carbon coating layer at least partially coating the lithium-containing phosphate inner core, a carbon source of the carbon coating layer is pre-sintered carbon, and Ig / Id of the carbon coating layer is greater than or equal to 1. The carbon-coated lithium-containing phosphate positive electrode material has the advantages of good conductivity, few surface functional groups, small specific surface area and the like, is beneficial to exerting the capacity of a lithium ion battery, and can improve the electrochemical performance and the cycle performance of the lithium ion battery.

The invention provides a composite current collector, a pole piece, a secondary battery and an electric device. The composite current collector comprises a base material layer, a first filler, a bonding layer and a conductive layer, the bonding layer is located between the base material layer and the conductive layer, one end of the first filler is embedded into the base material layer, the other end of the first filler is embedded into the bonding layer, the hardness of the first filler is larger than that of the base material layer, and the hardness of the first filler is larger than that of the bonding layer. According to the composite current collector, the first filler with the hardness larger than that of the base material layer and the bonding layer is introduced, one end of the first filler is embedded into the base material layer, the other end of the first filler is embedded into the bonding layer, the first filler can serve as an acting point between the base material layer and the bonding layer, and the elastic modulus of the composite current collector can be improved; and the risk of wrinkling in the pole piece processing process is reduced.

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 utility model relates to an electrode assembly and a battery monomer adopting the same, the electrode assembly consists of a positive plate, a negative plate and a diaphragm, the electrode assembly is provided with a positive lug and a negative lug, and the size of the negative plate is larger than that of the positive plate; the corner of the positive plate is an inner arc angle; the corner of the negative plate is an outer arc angle; the positive plates and the negative plates are stacked in sequence, and the diaphragms are arranged between the adjacent positive plates and negative plates. The corner of the negative plate is designed to be the outward arc angle, and the corner of the positive plate is designed to be the inward arc angle, so that the aluminum plastic film PP layer is effectively prevented from being scratched in the stacking and packaging processes of the electrode plates. According to the design, the stacking mode of the electrode plates is improved, the possibility of physical interference is reduced, and meanwhile, the reduction of loss in the battery assembly process is also facilitated.

The invention relates to a high-load composite iodine positive electrode based on an MXene electrochemical reaction regulator as well as a preparation method and application of the high-load composite iodine positive electrode. The high-loading-capacity composite iodine positive electrode comprises a porous self-supporting composite electrode film and an iodine active substance, wherein the porous self-supporting composite electrode film is formed by wrapping a carbon material with an MXene / cellulose network formed by mixing an MXene nanosheet, the carbon material and cellulose, and the iodine active substance is loaded on the porous self-supporting composite electrode film; wherein the iodine active substance comprises I <-> ions and I2; the MXene nanosheet is at least one of Ti < 3 > C < 2 > T < x >, Nb < 2 > T < x >, Mo < 2 > T < x > and V < 2 > T < x >.

The invention discloses a zinc negative electrode and a preparation method and application thereof. The zinc negative electrode comprises a polycatechol coating; and the thickness is 10 nm to 1 [mu] m. The method has the advantages of being green, environmentally friendly and low in cost. Catechol has zinc affinity and can be stably combined with zinc metal to form an ultrathin protection layer, compared with other organic matter coating methods (the process is complex and raw materials are expensive), the method is simpler and rapider, no binder or expensive medicine is needed, the zinc foil only needs to make contact with a modified solution for a certain time, practicability is high, and the method is suitable for large-scale production. The application prospect of large-scale continuous preparation is realized. The added oxidizing agent has the function of accelerating reaction, other metal ions can be introduced to be chelated with catechol, the deposition behavior of zinc ions is further optimized and regulated, and the battery performance is improved. The cycle life of the modified zinc negative electrode battery can reach more than 500h.

A method of synthesis of single crystal nickel-rich cathode materials can include preparing a precursor solution by dissolving lithium nitrate, nickel nitrate, manganese nitrate, and cobalt nitrate in water, aerosolizing the solution of a) in a stream of air using an ultrasonic sprayer, preheating the resulting droplets, premixing the droplets with methane, decomposing the droplets by passing through a co-flow burner, depositing solid particles on a filter, and calcinating the solid particles in a furnace in oxygen to produce a single crystal cathode material.

The invention relates to a preparation method of a nickel ion doped modified ferric sodium pyrophosphate positive electrode material, and belongs to the technical field of sodium ion battery positive electrode materials. The nickel ion doped modified ferric sodium pyrophosphate positive electrode material is prepared by adopting an integrated process system of liquid phase uniform mixing, spray granulation and precise segmented calcination. According to the process system, atomic-scale uniform doping of nickel ions and a specific microstructure of a precursor are realized through spray drying, and a plurality of inherent key technical problems of low electronic conductivity, low ion diffusion rate, impurity phase generation and the like of an NFPP material are solved together through a synergistic effect with a subsequent calcining process; furthermore, the discharge capacity of the ferric sodium phosphate pyrophosphate composite material at high rate is improved, so that the battery has relatively high cycling stability.

The invention discloses preparation and application of an organic-inorganic interface layer modified zinc negative electrode. The preparation method comprises the following steps: firstly, dispersing organic polymer polylactic acid and zinc sulfide powder into tetrahydrofuran, then coating the surface of zinc foil with the dispersed solution, and drying a solvent at 70 DEG C, so as to prepare the zinc negative electrode modified by an organic-inorganic interface layer. According to the interface layer, zinc ion deposition is regulated and controlled, and the problem of zinc dendrite growth is solved. In addition, the polylactic acid-zinc sulfide composite coating can effectively improve the redox kinetics of zinc ions and improve the coulombic efficiency of the zinc negative electrode. Due to the good ionic conductivity, the interface modification layer can improve diffusion of zinc ions, and the polarization influence caused by the concentration gradient of the zinc ions is relieved. Therefore, the prepared polylactic acid-zinc sulfide composite interface layer modified zinc negative electrode symmetric battery has more excellent cycling stability, the half battery has more stable coulombic efficiency, and the assembled total battery has more prominent capacity retention rate.

The present invention provides a lithium secondary battery comprising: a positive electrode; a negative electrode; a separator disposed between the positive electrode and the negative electrode; and a non-aqueous electrolyte, wherein the positive electrode includes a positive electrode active material, the positive electrode active material includes an overlithiated manganese-rich oxide containing at least 50 mol% of Mn among all metals other than lithium and having a molar ratio of lithium to transition metals of greater than 1, and the non-aqueous electrolyte contains a lithium salt, a compound represented by chemical formula 1, and a compound represented by chemical formula 2.

The invention relates to the technical field of batteries, and provides a pole piece, a battery cell, a battery pack and a pole piece design method. The pole piece comprises a main body part and a pole lug, the main body portion is configured to be wound to form a winding core. The main body portion has a winding start end and a winding stop end. The direction from the winding starting end to the winding ending end is the winding direction. And the at least two tabs are arranged on one side of the main body part at intervals along the winding direction. And in the winding direction, the heights of the tabs at the odd number positions and the heights of the tabs at the even number positions have opposite gradual change tendencies. Therefore, the integrity of the welding marks can be ensured, and the phenomena of tab tearing and the like caused by interference can be avoided.

The invention discloses a pole piece and a preparation method thereof, a battery and a power utilization system. The pole piece comprises a current collector and an active material layer which are arranged in a laminated manner, the active material layer comprises a plurality of active particles, and the active material layer is further provided with first pores and second pores; the aperture R1 of the first pores and the aperture R2 of the second pores meet the following conditions: 0.05 * D50 < = R1 < 0.65 * D50, 0.65 * D50 < = R1 < = 10 * D50, D50 is the median particle size of the plurality of active particles, and the unit of R1 and R2 is nm. Through the pore distribution structure with matched size, the wettability of the electrolyte in the active material is improved, so that the migration path of ions in the pole piece is optimized, the overall internal resistance of the battery is reduced, and the power performance, the fast charging performance and the low-temperature performance of the pole piece are further improved on the basis of improving the ion mobility.

A gel electrolyte and a separator are provided between the positive electrode current collector and the negative electrode current collector. The plurality of positive electrode current collectors and the plurality of negative electrode current collectors are stacked such that surfaces of negative electrodes with which active material layers are not coated or surfaces of positive electrodes with which active material layers are not coated are in contact with each other.

There is provided a 3D printed metal component having a metal body and an internal cavity within said metal body, the component comprising a 3D printed electrode within the internal cavity, the 3D printed electrode having lower density than the metal body.

A cylindrical secondary battery and an electronic device. The cylindrical secondary battery comprises a negative electrode sheet, the negative electrode sheet comprises a negative electrode current collector and a negative electrode material layer located on at least one surface of the negative electrode current collector, and the negative electrode material layer includes a first negative electrode material layer and a second negative electrode material layer. The first negative electrode material layer is located between the negative electrode current collector and the second negative electrode material layer, the first negative electrode material layer and the second negative electrode material layer each comprise a silicon-based material, and based on the mass of the negative electrode material layer, the mass percentage content of the element Si in the first negative electrode material layer is greater than the mass percentage content of the element Si in the second negative electrode material layer. The second negative electrode material layer is provided with a plurality of stripes, the plurality of stripes extend in the width direction of the negative electrode sheet when the negative electrode sheet is unfolded, and the plurality of stripes are arranged at intervals in the length direction of the negative electrode sheet when the negative electrode sheet is unfolded. By means of the described configuration, an electrolyte has good wetting performance on the negative electrode sheet, and the cylindrical secondary battery has good lithium precipitation performance and cycle performance.

The present invention discloses an aqueous zinc-ion battery, comprising: a positive electrode sheet, a negative electrode sheet and an electrolyte. The positive electrode material of the positive electrode sheet is a layered vanadium-based positive electrode material. Since cations and water molecules are inserted into the layers of vanadium pentoxide, the interlayer spacing is increased and the structure of the host material is supported and stabilized. Therefore, the fast and reversible insertion and extraction performance of charge and discharge ions can be improved, and the high rate and long cycle life of the layered vanadium-based positive electrode material can be achieved. The negative electrode sheet is a zinc foil with a surface coating. By defining the thickness of the surface coating to be 100 nm to 20 μm, the surface coating can prevent the zinc foil from directly contacting the electrolyte, and zinc will be deposited between the coating and the zinc foil during the charge and discharge process. In this way, the direct contact between zinc and the electrolyte is avoided, which helps to solve problems such as dendrites, corrosion and hydrogen evolution of the zinc negative electrode. Compared with the traditional aqueous zinc-ion battery, the electrochemical performance of this aqueous zinc-ion battery is enhanced.

The utility model relates to the technical field of batteries, and discloses a pole piece group, a laminated cell and a battery, the pole piece group comprises a first pole piece and a second pole piece with the same polarity, unfilled corner structures are arranged at the corners of the first pole piece and the second pole piece, the first pole piece is provided with one of the first unfilled corner structure and the second unfilled corner structure at the same corner position, and the second pole piece is provided with one of the second unfilled corner structure and the first unfilled corner structure. The first pole piece is provided with one of a first unfilled corner structure and a second unfilled corner structure, the second pole piece is provided with the other one of the first unfilled corner structure and the second unfilled corner structure, and the size of the first unfilled corner structure is larger than that of the second unfilled corner structure, so that the second unfilled corner structure protrudes out of the first unfilled corner structure when the first pole piece and the second pole piece are laminated. When the pole piece and the diaphragm are overlapped, the second unfilled corner structure protrudes out of the first unfilled corner structure along the thickness direction of the battery cell, and the hollow area exists at the same corner position, so that the hollow area can buffer and reduce pressure in a hot pressing process, and the pressure is prevented from being transmitted layer by layer along with the pole piece; and the risk that burrs at the corners of the pole piece pierce the diaphragm in the hot pressing process is reduced.

Disclosed herein is a current collector, a secondary battery, an electrical device, and a method for preparing the current collector. The current collector includes a substrate. The substrate includes the porous material. The affinity material is disposed in pores of the porous material. The affinity material is configured to promote the deposition of metal ions in an electrolyte solution. The affinity material includes at least one of a carbon-based material, a non-metal oxide, a carbide, a fluoride, a nitride, a sulfide, a phosphide, and an organic material. The above manner is able to effectively reduce the nucleation overpotential of the metal ions on the porous material of the current collector, promote the uniform diffusion and deposition of the metal ions within the pores of the porous material of the current collector, inhibit the generation of a dendrite, and improve the cyclic performance and safety of the battery.

The present disclosure provides batteries that have a reduced risk or no risk of esophageal or gastrointestinal damage in a conductive aqueous environment, such as when accidentally swallowed. The batteries are, in some embodiments, nominally 9V, 3V or 1.5V coin or button cell-type batteries.

The invention relates to a composite current collector and a preparation method thereof, an electrode plate, a battery and an electric device. The composite current collector comprises a supporting layer, a bonding layer and a conducting layer, wherein the bonding layer and the conducting layer are sequentially stacked on the two opposite surfaces of the supporting layer in the direction away from the supporting layer; according to the composite current collector, the stripping force between the supporting layer and the conductive layer is effectively improved, and the stripping risk of the composite current collector under long-term soaking in electrolyte is reduced.

The invention provides an electrochemical device and an electronic device comprising the same, the electrochemical device comprises a positive pole piece, the positive pole piece comprises a current collector and a positive pole material layer located on at least one surface of the current collector in the thickness direction, the positive pole material layer comprises a first positive pole material layer and a second positive pole material layer, the second positive electrode material layer is located between the first positive electrode material layer and the current collector, the positive electrode material layer comprises a positive electrode active material, the positive electrode active material comprises two or more than two nickel cobalt lithium manganate ternary materials, the two or more than two nickel cobalt lithium manganate ternary materials are divided into two groups, the chemical formula of the first group of lithium nickel cobalt manganate ternary materials is Lin1Nix1Coy1Mnz1M1m1O2, x1 + y1 + z1 + m1 is equal to 1 and smaller than or equal to 0.60, the chemical formula of the second group of lithium nickel cobalt manganate ternary materials is Lin2Nix2Coy2Mnz2M2m2O2, x2 + y2 + z2 + m2 is equal to 1 and larger than 0 and smaller than or equal to 0.14, and the two groups of lithium nickel cobalt manganate ternary materials are located in the first positive electrode material layer and the second positive electrode material layer respectively.

A solvent-free process employs a multifunctional carbon black to prepare compositions and electrodes for lithium-ion batteries. The multifunctional carbon black provides two or more desirable characteristics, acting, for example, as a conductive carbon additive, as a fibrillizing agent and / or as a mechanical reinforcement. In one example, an electroactive material, e.g., graphite or a lithium transition metal compound, a binder and a multifunctional carbon black are combined in one or more steps. High shear mixing is used to process the binder in the presence of the multifunctional carbon black. The resulting composition can be formed into a film which can be applied onto a suitable substrate to produce an electrode.

The invention provides an electrode plate and a preparation method thereof, a battery and electric equipment, the electrode plate comprises an electrode current collector and an electrode coating located on at least one side surface of the electrode current collector, and the electrode coating comprises an electrode active material; in the length direction of the electrode coating, the electrode coating comprises a center area and edge areas located on the two opposite sides of the center area, and the OI value of an electrode active material of the center area is smaller than the OI value of an electrode active material of the edge areas. According to the invention, the current distribution uniformity of the electrode plate in the battery cycle process can be improved, and the cycle life of the battery is prolonged.

The invention provides a secondary battery and a power utilization device, the secondary battery comprises a positive pole piece, the positive pole piece comprises a positive pole active material layer, the single-side coating weight G1 of the positive pole active material layer is greater than or equal to 360 mg / 1540.25 mm < 2 > and less than or equal to 550 mg / 1540.25 mm < 2 >, and the compaction density rho1 of the positive pole piece is greater than or equal to 2.4 g / cm < 3 > and less than or equal to 2.9 g / cm < 3 >; the positive pole piece meets the following conditions: the positive pole piece and the lithium metal sheet are prepared into a button cell, the button cell is subjected to constant-current discharge to 3.2 V at the rate of 1C, and the obtained discharge gram capacity is C1; carrying out constant-current discharge on the button cell to 2V at the rate of 1C to obtain discharge gram capacity C2; wherein r = C1 / C2, and r is more than or equal to 80% and less than or equal to 98%. The secondary battery provided by the invention still has relatively high power performance under the conditions of thick coating and high pressure density.

The invention provides a preparation method of a bipolar current collector based on a selective double-sided modified masking film. The preparation method comprises the following steps: depositing a Ni-Cr alloy layer on a single side surface of an aluminum substrate; one side of the masking film is etched to form a roughened surface, and the other side of the masking film is hydrophobic to form a hydrophobic surface; the roughened surface of the masking film and the surface, without the Ni-Cr alloy layer, of the aluminum matrix are pressed, and the edge is coated with curing glue; and placing the pressed and glued sample in an electroplating solution to electroplate a copper layer, finally cutting off an edge glue sealing area, and stripping the masking film. According to the preparation method, the masking film used for protecting the back surface of the aluminum substrate is subjected to double-sided differential treatment, the edge sealing technology is matched, and the Ni-Cr alloy is adopted for bottoming, so that the adhesive force between the copper plating layer and the aluminum substrate is improved, the risk of causing corrosion of a primary battery is reduced, the bipolar current collector which is firmly combined and has a pure interface can be prepared, and the service life of the bipolar current collector is prolonged. And a feasible solution is provided for realizing light-weight and high-performance current collectors for electronic devices such as lithium batteries and the like.

The invention belongs to the field of aqueous zinc ion batteries, and discloses an aqueous zinc ion battery positive electrode material, a preparation method, a positive plate and a battery. The preparation method comprises the following steps: mixing an oxalic acid aqueous solution with a CrNO3 aqueous solution to obtain a first mixed solution; mixing and stirring the first mixed solution with V2O5 and superconducting carbon, performing ultrasonic treatment to obtain a second mixed solution, and performing hydrothermal reaction to obtain a reaction product; and sequentially carrying out cooling, centrifugal washing and vacuum freeze drying treatment on the reaction product to obtain the aqueous zinc ion battery positive electrode material. The aqueous zinc ion battery positive electrode material has the advantages of stable structure, high specific capacity, good reversibility and excellent rate capability.

An electrode sheet, a battery cell, and an electric device. The electrode sheet comprises a current collector, a first transition layer, a second transition layer, two active material layers, a first conductive member, and a second conductive member. The current collector comprises a supporting layer, a first conductive layer, and a second conductive layer. The current collector further comprises a first section and a second section. The first transition layer is located in the first section. The second transition layer is located in the first section. One of the active material layers is arranged on the first transition layer, and the other of the active material layers is arranged on the second transition layer. The first conductive member is arranged on the first conductive layer. The second conductive member is arranged on the second conductive layer. The first conductive member and the second conductive member are welded and form a plurality of welding marks, and at least one welding mark is further connected to the current collector. The current collector further comprises a first part and a second part, the projection of an edge part of each active material layer adjacent to the welding marks and the projection of the first part overlap, and the second part is provided with welding marks. The tensile strength of the first part is smaller than that of the second part. The electrode sheet can improve the safety.