16results about How to "Good electrolyte wettability" patented technology

The invention discloses a composite diaphragm as well as preparation and application thereof in a lithium ion battery, and belongs to the technical field of lithium ion battery materials. The composite diaphragm comprises a base material, at least one ceramic coating and at least one organic polymer coating, wherein the surface of the base material is coated with the at least one ceramic coating and the at least one organic polymer coating. The thickness of the ceramic coating is 1-3 m, and the thickness of the organic polymer coating is 0.3-5 m. And the ceramic coating is prepared by adopting a water-based coating process, so that the heat resistance and electrolyte wettability of the diaphragm can be improved. The organic polymer coating is prepared in an electrostatic spinning mode, and a spherical bead structure is formed by adjusting spinning parameters. Due to the fact that a large number of bead structures are contained, the prepared composite diaphragm shows stable super-hydrophobic performance. And the organic polymer has extremely high heat resistance and cohesiveness to a pole piece, and the diaphragm is endowed with extremely high porosity by the electrostatic spinning preparation process.

The invention discloses a porous polymer composite diaphragm and a preparation method thereof, and relates to the technical field of batteries. The method comprises the following steps: 1, mixing polyether sulfone with a solvent, and fully dissolving to form a homogeneous solution, thereby obtaining feed liquid A; mixing and uniformly stirring an auxiliary agent and a solvent, adding an inorganic filler, and continuously stirring to uniformly disperse the inorganic filler to obtain a feed liquid B; 2, mixing the feed liquid A and the feed liquid B, and fully stirring to form slurry; 3, uniformly coating a base film with the slurry by adopting a gravure coating method to obtain a wet coating diaphragm; and 4, soaking the wet coating diaphragm into a coagulating bath, then soaking in water, washing, and drying to obtain the porous polymer composite diaphragm. The porous polymer composite diaphragm and the preparation method thereof provided by the invention have the beneficial effects that polyether sulfone is used as a main body material, so that the heat resistance, the dimensional stability and the electrolyte wettability of the diaphragm are improved, the internal resistance of a battery is reduced, and the safety and the electrochemical performance of the battery are improved.

The invention discloses a polyimide modified polyolefin composite diaphragm and a preparation method thereof, the composite diaphragm comprises a polyolefin diaphragm base material and a polyimide / ceramic particle composite coating with a porous structure arranged on one side or two sides of the polyolefin diaphragm base material, and a PI coating porous structure is constructed through a pore-foaming agent. By introducing PI, the heat resistance of the diaphragm is remarkably improved; by adding the ceramic particles, on one hand, the electrolyte wettability of the diaphragm can be further improved, better thermal stability and mechanical performance are expected, and more uniform pore distribution is generated. Lithium bromide is preferably used as a pore-foaming agent and is matched with a low-boiling-point solvent for use, on one hand, the solubility of the lithium bromide in a THF / methanol mixed solution is extremely high, and high porosity is obtained by taking the lithium bromide as a template; secondly, in the solvent drying process, lithium bromide can absorb moisture from air, and PAA is helped to be cured to construct a porous structure, so that the high-temperature-resistant composite diaphragm with excellent air permeability is obtained.

The invention provides a preparation method and application of a composite diaphragm with a multistage nanometer branch structure, and belongs to the technical field of lithium metal batteries. A polymer matrix, a first structure inducer and a second structure inducer form a precursor solution, and the precursor solution is subjected to an electrostatic spinning process and in-situ induction to form the multi-stage structure composite diaphragm with a trunk-branch characteristic; the first structure inducer is a quaternary ammonium salt compound, and the second structure inducer is imidazolium ionic liquid. The dual-inducer system endows the lithium metal negative electrode with interface stability and cycle reliability.

The invention discloses a modified acrylate polymer as well as a preparation method and application thereof, and belongs to the technical field of lithium ion battery materials. The modified acrylate polymer provided by the invention is simple in preparation method, easy to synthesize, high in reaction product yield, low in preparation cost and excellent in environmental protection performance, a lithium ion battery diaphragm coating prepared from the modified acrylate polymer provided by the invention has good electrolyte infiltration performance, the internal resistance of a battery can be reduced, and the service life of the battery is prolonged. The rate capability and the discharge capacity of the battery are improved; meanwhile, the high-temperature-resistant performance is good, and the safety and the reliability of the battery in a high-temperature environment or when the battery is overheated can be improved.

The present disclosure provides an electrode plate, a lithium-ion battery, a battery module, a battery pack, and an electric device. The electrode plates provided in the present disclosure comprise a current collector and an active substance layer disposed on at least one surface of the current collector, wherein the active substance layer comprises a surfactant lithium salt. The present disclosure utilizes the affinity between the surfactant lithium salt and the electrolyte to effectively reduce the surface tension of the electrolyte, enhance the wettability of the electrolyte on the electrode plate, reduce the interfacial impedance of the battery, and improve the utilization efficiency of the active substance, thereby realizing the improvement in the rate capability, discharge capacity, and service life of the lithium-ion battery.

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 invention provides a composite polymer porous membrane and a preparation method and application thereof, the preparation method comprising: mixing a first solvent, a second solvent, a polymer and hydrophilic inorganic particles to obtain a casting solution; the first solvent is a good solvent for the polymer, the boiling point of the first solvent is less than the boiling point of the second solvent, and the surface tension of the first solvent is less than the surface tension of the second solvent; the casting solution is coated on a support net to obtain a liquid film containing the support net; removing the first solvent in the liquid film to obtain a primary film; removing the second solvent in the primary film to obtain the composite polymer porous membrane. The preparation method is simple and easy to implement, and through the design and mutual compounding of the first solvent, the second solvent and a specific preparation process, a three-dimensional through structure with high porosity is formed in the obtained composite polymer porous membrane, which has the characteristics of high mass transfer efficiency, good gas isolation effect, high mechanical properties and low resistance, and fully meets the performance requirements of the alkaline water electrolyzer for the diaphragm.

The invention relates to a composite diaphragm, a preparation method thereof and a battery, and belongs to the technical field of battery materials, the composite diaphragm comprises a base membrane and a coating distributed on the surface of the base membrane; the coating comprises sodium super-ionic conductor type phosphate, a single-arm carbon nano tube and a binding agent, the mass ratio of the sodium super-ion conductor type phosphate to the single-arm carbon nanotube is (20-80): 1. The composite diaphragm provided by the invention has excellent heat shrinkage resistance, electrolyte infiltration performance and liquid absorption capability, and relatively high ionic conductivity and puncture strength, and the battery comprising the composite diaphragm has relatively high capacity and excellent cycle performance.

The invention relates to the technical field of battery separators, in particular to a high-bonding lithium-ion battery separator and a preparation method thereof. The introduction of wrinkled MoS2@KHCO3 nanosheets greatly improves the mechanical strength, high temperature resistance, thermal conductivity and flame retardancy of the separator, so that PVDF powder is relatively firmly adhered to the surface of the MoS2@KHCO3 nanosheets, and the problem of PVDF coating shedding is improved. Modified polyethyleneimine is used as a binder, firstly β-dextrin and branched polyethyleneimine are chemically cross-linked to form a prepolymer, and then terephthalaldehyde and p-formylbenzoic acid are used for further cross-linking to prepare a self-repairing binder with a network structure. An aluminum-based organic framework is prepared to enclose a functionalized lithium ion liquid with a thiol group to form an ion conductor, thereby modifying the PVDF powder, so that the PVDF powder is uniformly and firmly adhered to the MoS2@KHCO3 nanosheets, and the addition of the modified PVDF powder greatly improves the ionic conductivity and flame retardancy of the separator.

The invention provides a surface-etched aluminum fiber current collector and a continuous preparation method and application thereof, and belongs to the technical field of current collector materials. The surface of the surface-etched aluminum fiber current collector prepared by the method provided by the invention has a porous structure, so that the adhesive force between the surface-etched aluminum fiber current collector and electrode slurry is remarkably improved, the conductivity is enhanced, and the limitation of commercial aluminum foil and foamed aluminum in the aspect of adhesive force is effectively solved; and the surface-etched aluminum fiber current collector with the porous structure shows good electrolyte wettability, the rate capability and low-temperature performance of an electrode are effectively improved, the cycle life of the electrode is effectively prolonged, and commercial aluminum foil and foamed aluminum are difficult to realize. The surface-etched aluminum fiber current collector prepared by the method can be widely applied to electrode preparation of lithium ion batteries, sodium ion batteries and / or zinc ion batteries, and has important commercial application prospects.

This invention relates to the field of battery technology, specifically to a separator, comprising a base film layer, a first coating layer located on one side of the base film layer, and a second coating layer located on the other side of the base film layer; the first coating layer comprises a sponge-like porous structure; the first coating layer comprises a polymer continuous phase and a porous structure, first inorganic particles, and first polymer particles dispersed in the polymer continuous phase, the polymer continuous phase, the porous structure dispersed in the polymer continuous phase, and the first inorganic particles forming a sponge-like porous structure; the first polymer particles form protrusions on the side of the first coating layer facing away from the base film layer; the second coating layer comprises second inorganic particles and second polymer particles, each independently forming a ceramic layer and a polymer layer, or mixed together to form a ceramic-polymer blend layer. The separator of this invention has excellent resistance to foreign object puncture and interfacial heat transfer efficiency, which can significantly improve the safety performance and cycle performance of the battery.

The present invention relates to a composition for an electrolyte of a lithium secondary battery, a gel polymer electrolyte including a polymerization product thereof, and a lithium secondary battery including the gel polymer electrolyte, the composition including a lithium salt, a polyalkylene carbonate-based polymer including a unit represented by Formula 1 below and having a weight average molecular weight of 1,000 g / mol to 1,500,000 g / mol, and an organic solvent, wherein the composition either includes lithium difluoro(oxalato)borate and lithium bis(oxalato)borate at a weight ratio of 1:5 to 5:1, or includes a compound represented by Formula 3-1 in an amount of 0.01 wt% to 5 wt% and a compound represented by Formula 3-2 in an amount of 0.01 wt% to 10 wt% based on the total weight of the composition.

Disclosed is a separator for a lithium secondary battery, including: a porous polymer substrate; and an organic / inorganic composite porous layer disposed on at least one surface of the porous polymer substrate and including a nanofiber scaffold, inorganic particles and a binder polymer, wherein the organic / inorganic composite porous layer has a structure including the inorganic particles inserted to the voids of the nanofiber scaffold, the inorganic particles have a BET specific surface area of 20-75 m2 / g, and the binder polymer is present in an amount of 2-5 wt% based on 100 wt% of the organic / inorganic composite porous layer. Also disclosed is a lithium secondary battery including the separator.

The present invention relates to a composition for an electrolyte of a lithium secondary battery, a gel polymer electrolyte including a polymerization product thereof, and a lithium secondary battery including the gel polymer electrolyte, the composition including a lithium salt, a polyalkylene carbonate-based polymer including a unit represented by Formula 1 below and having a weight average molecular weight of 1,000 g / mol to 1,500,000 g / mol, and an organic solvent, wherein the composition either includes lithium difluoro(oxalato)borate and lithium bis(oxalato)borate at a weight ratio of 1:5 to 5:1, or includes a compound represented by Formula 3-1 in an amount of 0.01 wt% to 5 wt% and a compound represented by Formula 3-2 in an amount of 0.01 wt% to 10 wt% based on the total weight of the composition.

This invention discloses an electrode slurry for a high-capacity lithium battery for unmanned aerial vehicles and its coating process, belonging to the field of electrode material technology. By weight, it comprises the following raw materials: 5-8 parts polybenzimidazole, 40-50 parts dimethylacetamide, 15-20 parts supported MOF composite graphene, 3-4 parts carbon nanotubes, and 5-10 parts conductive carbon black. The supported MOF composite graphene is prepared by adsorbing and loading p-aminobenzoic acid onto MOF composite graphene. The MOF composite graphene is prepared by in-situ synthesis of Cu-MOF on the surface of modified graphene. This invention improves the heat resistance and mechanical properties of the binder through the amidation reaction of polybenzimidazole with p-aminobenzoic acid on the surface of graphene oxide nanosheets. It also increases the adhesion of the binder to the graphene oxide nanosheets by synthesizing a porous structure on the surface of the graphene oxide nanosheets, reducing the detachment of graphene nanosheets caused by high temperature and electrolyte.