146 results about "High electrolytes" patented technology

Provided are a binder composition which has high electrolyte resistance characteristics, and a secondary battery which uses a positive electrode using the binder composition for high-temperature cycle characteristics. [Solution] The binder composition for the secondary battery positive electrode according to the present invention contains a polymerized unit which contains a nitrile group; a polymerized unit of (meth) acrylic acid ester; a polymerized unit which contains a hydrophilic group; and a polymerized unit of linear alkylene having a carbon number of at least four. In a mixed solvent in which a volume ratio EC:DEC between ethylene carbonate (EC) and diethyl carbonate (DEC) at 20° C. is 1:2, a degree of swelling with respect to an electrolyte in which LiPF₆ is dissolved to have a concentration of 1.0 mol/L is between 100% and 500%.

The invention relates to a chemical combination method of a lithium-ion recharging battery, which can be used for preparing the lithium-ion recharging battery with high electrolyte residual quantity, capacity, multiplying power discharge performance and circulating performance. The chemical combination method has the technical scheme that closed chemical combination is adopted, the battery is charged in three stages in a constant-current way, and the battery is then charged in a constant-voltage.

The invention provides a preparation method of an electrospun composite membrane for a lithium ion battery, and relates to lithium ion batteries. The invention provides the preparation method of the electrospun composite membrane which is higher in ionic conductivity, better in electrochemical properties and smaller in thickness for the lithium ion battery. The preparation method comprises: preparing a precursor solution A for compounding polyvinylidene fluoride and another polymer; preparing a precursor solution B for mixing the polyvinylidene fluoride and inorganic nano-material; and adopting an electrospinning technology to obtain the electrospun composite membrane for the lithium ion battery. According to the preparation method provided by the invention, PVDF is adopted as a substrate; a porous mesh-shaped composite fiber membrane is produced by using the electrospinning technology, a polymer blend and the inorganic nano-material; and a crystallinity of a PVDF system is reduced, thus improving ion conductivity, tensile strength and breaking elongation of an amorphous area of the membrane, ensuring ionic conductivity and safety performance of the lithium ion battery with a higher electrolyte, and obtaining fiber membranes different in thickness. Therefore, application needs of the lithium ion battery membrane are met.

The present invention relates to a rechargeable lithium ion battery having an electrode plate with a high active material density and high electrolyte permeability. Upon producing the rechargeable lithium ion battery, hollow resin particles that can be collapsed by rolling are incorporated in a positive electrode mixture layer or a negative electrode mixture layer before the electrode mixture layer is rolled. The hollow resin particles are collapsed in the course of rolling the positive electrode mixture layer or the negative electrode mixture layer, so that the active material density can be easily increased. Further, the collapsed resin particles form unevenness on the surface of the electrode plate and also form open pores in the electrode plate, so that electrolyte permeability can be enhanced. As a result, the discharge capacity and rate characteristics of rechargeable lithium ion batteries can be increased.

The invention relates to application of a heat-resistant porous diaphragm to a lithium ion battery. The porous diaphragm is prepared from one or more than two of heat-resistant high-molecular polymers such as polysulfone, polyketone, polyimide, polybenzimidazole and polyetherimide; the pore diameter of the porous diaphragm is 5-500 nm, and the porosity rate is 30-70%. The porous diaphragm is high in porosity rate, the pore structure of porous diaphragm is easy to regulate, and obtained pores have a certain degree of curvature, so that when the porous diaphragm is applied to the lithium ion battery, micro short circuit and self-discharge phenomena can be effectively avoided, and meanwhile, higher electrolyte affinity and cycling stability are realized. A preparation method for the diaphragm is simple, environment-friendly, and easy to popularize; the porous diaphragm has a relatively good application prospect in the field of lithium ion batteries.

Clear, or translucent fabric softener compositions comprise fabric softener compound, principal solvent system, and high electrolyte levels. The high electrolyte level allows for a broader range of principal solvents to be used and/or reduces the incidence of increased viscosity when low levels of principal solvent are used. Phase stabilizers which are primarily ethoxylated hydrophobic materials can be used to reduce the amount of principal solvent that is needed and/or to stabilize the compositions in the presence of the highest levels of electrolyte. Specific phase stabilizers provide additional benefits including improved softening. Specific electrolytes provide improved results. Addition of primary solvents and/or phase stabilizers to the softener compounds can improve the viscosity/handling of the compounds and the ability to create the finished compositions.

The present invention is directed a multifunctional polymer capable of inhibiting both calcium carbonate and calcium phosphate scale. The multifunctional polymer contains at least one monomer unit from each of four groups: dicarboxylic acids, mono-carboxylic acids, nonionic monomers, and sulfonated or sulfated monomers. The polymer also inhibits many other alkaline earth scales, such as calcium sulfate scale and provides stabilization of minerals such as iron, zinc and manganese. The polymer is especially effective in highly stressed systems that contain high electrolyte concentrations and have a high number of cycles of concentration.

The invention relates to single-ion gel polymer electrolyte and a preparation method thereof. The preparation method is characterized by comprising the following steps: firstly, selecting double-bond sulfonate and preparing double-bond lithium sulfonate by utilizing the characteristic that sodium sulfate is not dissolved into absolute ethyl alcohol; preparing the double-bond lithium sulfonate into a single-ion gel polymer base body, wherein the mol ratio of an added monomer to a carbon-carbon double bond in the lithium sulfonate ranges from (10 to 1) to (1 to 10), a catalyst is 2,2'-azobis(2-methylpropionitrile) with the concentration of 2wt%, and a solvent is toluene; reacting at 70 DEG C-80 DEG C for 7h-12h; and taking the prepared polymer as a base body and preparing the single-ion gel polymer electrolyte, wherein the adding amounts of the polymer and the organic solvent, and liquid electrolyte are 1g-3g and 20ml-50ml respectively. The single-ion gel polymer electrolyte has the beneficial effects that the transport number of lithium ions of the electrolyte is improved through introducing the lithium ions into the polymer in a chemical bond connecting manner, so that the possibility is provided for further improving the energy density of a lithium-ion battery, and a certain foundation is laid for application of the gel polymer electrolyte in actual production.

The invention discloses a novel aluminum plastic film for a lithium battery. The novel aluminum plastic film comprises a protecting layer, a chemical treatment layer I, a middle aluminum foil, a chemical treatment layer II and a thermal sealing layer, wherein the chemical treatment layer I and the chemical treatment layer II are compact metal oxide film layers which are formed on the surface of the middle foil by performing chemical treatment on the surface of the middle aluminum foil by a mixture solution of chromium salt, acid and fluoride; and the protecting layer, the middle aluminum foil subjected to chemical treatment and the thermal sealing layer are combined in a once forming thermal adhesion mode by a thermal adhesion combining machine. The aluminum plastic film disclosed by the invention has the advantages of manufacturing easiness, low cost, good performance and the like, can be applied to packaging of a lithium ion battery core, and has the properties of high isolation, forming easiness, high thermal sealing capability, high electrolyte corrosion resistance and the like.

The present invention is method for cleaning electrolyte in the bottom of residual electrolysis anode. The cleaning plant includes a residual anode conveying catenary chain bogie, a No. 1 electrolyte cleaning unit, a front approach switch, a bogie stopper, a No. 2 electrolyte cleaning unit, a back approach switch, a cleaning PLC controller, a No. 1 cleaning frequency variator and a No. 2 cleaning frequency variator. The cleaning process includes the following steps: inducing, signal transmission, confirming, transmitting command and cleaning. The present invention has high electrolyte cleaning effect, effective raising of anode quality, lowering of the ash and sodium content in anode, capacity of raising the antioxidant capacity of anode and capacity of prolonging the service life of anode.

A battery separator comprising a nonwoven fabric, wherein the nonwoven fabric contains (1) superfine fibers having a fiber diameter of 3 μm or less, (2) noncircular fine fibers having a noncircular cross-sectional shape and having a fiber diameter of 3 to 5 μm (excluding 3 μm), the fiber diameter meaning a diameter of a circle having an area the same as that of the noncircular cross-sectional shape, and (3) polypropylene based high-strength composite fibers containing a fusible component on the surface thereof and having a tensile strength of 4.5 cN/dtex or more, and the fusible component contained in the polypropylene based high-strength composite fibers is fused, and a battery comprising the battery separator are disclosed. A battery separator of the present invention has a high electrolyte-holding capacity and is capable of effectively preventing a short circuit, even if the separator is designed to be thinner to enhance the capacity of a battery.

The invention discloses a preparation method of a lithium-ion battery diaphragm master batch. According to the part by weight, the lithium-ion battery diaphragm master batch is composed of 60-90 parts of high density polyethylene, 0.1-0.5 parts of a cross-linking agent, and 9.9-39.5 parts of hydrophilic modified aluminum oxide nanometer powder. The preparation method of the lithium-ion battery diaphragm master batch comprises the steps of: mixing all the components uniformly; then extruding, drawing and pelletizing at 160 DEG C to 180 DEG C to prepare the lithium-ion battery diaphragm master batch. As the hydrophilic modified aluminum oxide nanometer powder is adopted as a reinforcing and toughening agent and a hydrophilic filling material, the lithium-ion battery diaphragm master batch when being compared with a traditional high density polyethylene diaphragm raw material has more excellent toughness, higher melting temperature and higher electrolyte wettability; and therefore, the master batch is an important foundation for the preparation of a high-performance lithium-ion battery diaphragm material.

The invention relates to the field of secondary batteries, in particular to a diaphragm, a method for preparing the diaphragm and a secondary battery comprising the diaphragm. The diaphragm comprises a base material and a modification layer arranged on the surface of the base material, wherein the modification layer contains amphiphilic polymers which are at least one of polyvinyl butyral, amphiphilic segmented copolymer and polyolefin with a functional end group, and the functional end group at least contains a hydrophilic group. The diaphragm has high electrolyte loving property and water loving property, so that the diffusion rate of electrolyte in a prepared lithium ion battery is high, infiltration time is shortened, and the charge-discharge rate of the battery is increased; besides, the standing time of a naked battery cell after injection can be shortened, and then efficiency is improved and cost is reduced.

The invention relates to a composite solid electrolyte with high ionic conductivity and a preparation method thereof, belonging to the technical field of solid electrolyte for lithium ion batteries. The composite solid electrolyte is composed of inorganic solid electrolyte, polymer electrolyte and lithium salt. The mass ratio of inorganic solid electrolyte, polymer electrolyte and lithium salt is0.2-0.8: 0.2-0.8: 0.05-0.5. The invention prepares inorganic solid electrolyte nanofibers by electrostatic spinning, prepares vertically oriented inorganic solid electrolyte skeleton by freeze castingmethod, and pours polymer and lithium salt to form composite solid electrolyte. Nanofibers instead of nanoparticles have obvious advantages in the preparation of intact and uniform inorganic solid electrolyte skeleton and the formation of fast Li + transport pathway, which can significantly improve the room temperature ionic conductivity of the electrolyte, up to 10<-4>S.cm<-1>. By adjusting thesize of nanofibers and freeze-casting conditions to control the skeleton structure, so as to regulate the comprehensive properties of the electrolyte.

The invention discloses a preparation method of solvent-free waterborne polyurethane resin with anionic and non-ionic characteristics. Polyester diol or polyether diol reacts with aliphatic isocyanate, two hydrophilic components including a T-type non-ionic dihydric alcohol monomer and a carboxyl-containing anionic dihydric alcohol monomer are introduced, the introduced groups are neutralized and then dispersed and emulsified with water, a chain extension reaction is performed with polyamine, and the solvent-free waterborne polyurethane resin with anionic and non-ionic characteristics is obtained. The synthesized resin has the characteristics of anionic and non-ionic waterborne polyurethane, and the defect that anionic waterborne polyurethane is sensitive to low PH values and electrolytes can be overcome. The solvent-free waterborne polyurethane resin with the anionic and non-ionic characteristics has great application significance in leather product treating fluids with low PH values and high electrolyte content.

The invention relates to an electrolyte solution of a lithium ion power battery and the lithium ion power battery containing the electrolyte solution. The electrolyte solution comprises an electrolyte and an organic solvent, and also comprises an additive. The additive consists of the following components based on the total weight of the electrolyte solution, 1-4% of vinylene carbonate, 0.5-2% of propylene sulfite and 0.5-2% of butanedinitrile. The electrolyte solution has four solvent systems, so that the electrolyte has appropriate dielectric constant and viscosity; by adding three functional additives, a compact stable SEI film is formed, and also the high-temperature SEI film is improved in stability at a high temperature, and thus the high temperature resistance of the electrolyte solution is improved; the electrolyte solution has a salt density of 1-1.5 mol/L and higher electrolyte solution conductivity, and is capable of effectively improving multiplying power and power characteristics of a lithium iron phosphate power battery; and the lithium ion power battery has high capacity conservation rate and capacity restoration ratio and good cycle performance when stored at a high temperature.

The invention provides a porous polymer membrane prepared from a polyvinyl acetal polymer treated by using polyurethane and a preparation method of the porous polymer membrane. Communicated holes are uniformly distributed in the porous polymer membrane, the porous polymer membrane has better electrolyte adsorption capacity and high electrolyte uptake rate up to over 300%, the gelation of the system is realized through adsorbing swelled electrolyte, and the porous polymer membrane and a gel system can stably exist for a long term. The conductivity of a gel polymer electrolyte approaches to the average value 1.0*10<-3>S/cm of the conductivity of a liquid electrolyte, the electrochemical stability window is 2.0-5.0V, the mechanical performance and the electrode compatibility are remarkably improved, the porous polymer membrane can be applied as the gel polymer electrolyte, and the safety of a battery is improved. Meanwhile, diaphragms in a liquid electrolyte system or other battery systems do not need to be used as supports.