91results about How to "Good electrolyte wettability" patented technology

An electrode which has a Si-containing material layer and a porous film, and a lithium battery employing the same. In the electrode, the Si-containing material layer is applied on an electrode current collector and/or an electrode active material to protect the surface of the electrode current collector from oxidation. Also, the applied Si-containing material layer enhances the adhesion between the electrode current collector and the electrode active material to improve cycle life characteristics. Also, it increases the adhesion between the electrode active material and the porous film to reduce resistance, and to improve ohmic contacts and to lower the Shottkey barrier. In addition, the electrode includes the porous film functioning as a separator, and thus can provide a battery which is safe under conditions of overcharge and heat exposure without needing an additional separator.

The invention discloses a composite separator for a lithium ion battery. The composite separator comprises a microporous base membrane and a ceramic layer coating one or two sides of the microporous base membrane, wherein lithium-containing phosphate is the main ingredient of ceramic powder in the ceramic layer. The composite separator can be used for effectively improving the electrolyte wettability, ionic conductivity, thermal stability and machinability of a membrane. A lithium ion battery containing the composite separator can be used as a driving power supply of a mobile phone, a laptop computer or an electric automobile.

The invention relates to a graphene aerogel loaded lithium iron phosphate porous composite material and a preparation method thereof. The technical scheme of the invention is as follows: the preparation method comprises the steps: adding a graphene oxide into deionized water, and carrying out stirring so as to obtain a solution I with the concentration of 2kg/m<3> to 5kg/m<3>; adding a ferric salt into the solution I in accordance with that the mass ratio of the ferric salt to the graphene oxide is 1: (0.03 to 0.3), and carrying out stirring so as to obtain a solution II; adding phosphate and a lithium salt into the solution II in accordance with that the mass ratio of the ferric salt to the phosphate to the lithium salt is 1: 1: 2, carrying out stirring, carrying out a hydrothermal reaction in a reactor, carrying out washing, carrying out freezing, and carrying out drying in a vacuum freeze drier; carrying out heat preservation for 4 to 10 hours in a tube type furnace in a protective atmosphere at the temperature of 550 DEG C to 850 DEG C, and carrying out furnace cooling, thereby preparing the graphene aerogel loaded lithium iron phosphate porous composite material. According to the graphene aerogel loaded lithium iron phosphate porous composite material and the preparation method thereof, the operation is convenient, industrial production is facilitated, the prepared product is adjustable in pore structure and particle size of lithium iron phosphate loaded on the surface of graphene, and the structural stability, cycle performance and high rate capability are excellent.

The invention provides a preparation method for a lithium ion battery. The method comprises the following steps: 1) mixing an anode active material, a conductive agent, a binder and a fluorine-containing surfactant at a mass ratio of (80%-97%): (1%-10%): (1%-10%): (0.5%-10%) with a dissolvent, preparing the mixture into an anode sizing agent; coating the anode sizing agent onto an anode current collector, drying, rolling and slitting, thereby obtaining an anode pole piece; 2) mixing a cathode active material, a conductive agent, a binder and a fluorine-containing surfactant at a mass ratio of (80%-97%): (1%-10%): (1%-10%): (0.5%-10%) with a dissolvent, preparing the mixture into a cathode sizing agent; coating the cathode sizing agent onto a cathode current collector, drying, rolling and slitting, thereby obtaining a cathode pole piece; and 3) utilizing the anode pole piece, the cathode pole piece, the diaphragm and the electrolyte to assemble the lithium ion battery.

The invention relates to a composite separator and a preparation method thereof. The lithium battery composite separator is formed by compounding a polyolefin microporous membrane and one or two high-temperature-resistant non-woven fabric layers, wherein the thickness of the composite separator is 6-40[mu]m, the surface density is 5-35g/m<2>, the porosity is 35-50%, the liquid absorption rate is greater than 150%, the thermal shrinkage rate at 130 DEG C is less than 0.5%, and the ionic conductivity is (1.0-5.0)*10<-3>S/cm. The composite separator disclosed by the invention has the advantages that the is fast; the lithium battery composite diaphragm has the characteristics of fast electrolyte infiltration, high liquid absorption rate, low thermal shrinkage rate, good mechanical property andthe like, the compatibility of the separator and an electrolyte is improved, the safety and the service life of a lithium battery are improved, and the prepared composite separator also adapts to thetechnological requirements of mechanical assembly of a battery production line and has a relatively wide application field.

The invention relates to a full-ceramic lithium ion battery diaphragm and a preparation method thereof, and belongs to the field of diaphragm materials. According to the method, diatomite is used as amain raw material, lithium hydroxide is matched, a small amount of rare earth elements are doped, an organic binder is used for molding, and the full-ceramic lithium ion battery diaphragm taking silicon dioxide and lithium silicate as main components is formed after high-temperature calcination. The diaphragm is excellent in thermal stability, and the safety problem that a traditional lithium ionbattery diaphragm shrinks and deforms due to heating to cause short circuit and fire in a battery is thoroughly solved. Meanwhile, the diaphragm has the characteristics of good electrolyte affinity,high porosity and large liquid absorption capacity, the mass transfer efficiency of lithium ions in the battery is effectively promoted, and the capacity retention ratio of the battery during high-current charging and discharging and long-time operation is improved.

The invention relates to a preparation method of a high-conductivity composite material (FM-coating G) with molybdenum sulfide nanoflowers uniformly loaded on graphene and system modification of the high-conductivity composite material for a lithium-sulfur battery. The preparation method comprises the following steps: dispersing a certain amount of graphene oxide in a DMF solution, adding a certain amount of ammonium tetrathiomolybdate and urea into the dispersion liquid, carrying out ultrasonic treatment, adding a hydrazine hydrate solution, stirring the obtained mixed solution, carrying outuniform ultrasonic treatment, and carrying out a solvothermal reaction to prepare the FM-coating G composite material. An FM-coating G/S positive electrode material is prepared from the quantitative FM-coating G and elemental sulfur through a hot melt diffusion method. The FM-coating G ethanol dispersion liquid is filtered to a PP diaphragm under vacuum, thereby obtaining the FM-coating G-PP modified diaphragm. The obtained material has an efficient synergistic effect when being applied to a positive electrode and a diaphragm of a lithium-sulfur battery, and the adsorption/catalysis capabilityon polysulfide is enhanced, so that the battery has excellent cycle performance and high energy density.

The invention discloses a composite conductive agent and a preparation method thereof, and a lithium ion battery, belonging to the technical field of lithium ion batteries. The composite conductive agent is prepared by growing a metal organic framework 2-methylimidazole zinc salt on the surface of an initial conductive agent, and then carrying out high-temperature carbonization and acid etching toobtain the composite conductive agent surface-coated with porous amorphous carbon, wherein the initial conductive agent is composed of a granular conductive agent and a linear conductive agent. According to the invention, the granular conductive agent is anchored on the linear conductive agent, namely a carbon nanotube, and the dispersing capacity of the carbon nanotube is improved through sterichindrance repulsion; in positive electrode slurry and negative electrode slurry, the granular conductive agent fills in gaps among active material particles, and the linear conductive agent is used for remote overlapping with the granular conductive agent to form a dot-line three-dimensional net-shaped conductive network, so the contact performance of the conductive agents and an active materialis improved, electron transmission efficiency is improved, and the probability of insufficient contact caused by expansion of active substances in the charging and discharging processes is reduced.

The invention discloses a positive electrode material of a lithium-sulfur battery, a preparation method of the positive electrode material and the lithium-sulfur battery. The lithium-sulfur battery positive electrode material comprises a composite carbon particle body, the composite carbon particle body is spherical and has a three-dimensional porous structure, the composite carbon particle body comprises carbon nanotubes and Ketjen black, and the carbon nanotubes and the Ketjen black are mixed and distributed; and elemental sulfur is at least deposited on the surface of the composite carbon particle body and the pore surface of the three-dimensional porous structure. The active layer of the positive electrode of the lithium-sulfur battery contains the positive electrode material of the lithium-sulfur battery. According to the lithium-sulfur battery positive electrode material disclosed by the invention, the composite carbon particle body formed by the carbon nanotubes/Ketjen black isa spherical and porous sulfur-loaded skeleton, so that the sulfur loading capacity is high, the energy density is high, the shuttle effect caused by polysulfide is low, and the cycling stability is good. A pole piece formed by the positive electrode material of the lithium-sulfur battery and the lithium-sulfur battery are high in energy density, good in electrolyte wettability and excellent in cycle performance.

The present invention provides an electrode assembly, which includes a first electrode, an adhesive layer disposed on the first electrode and including a host layer comprising a host and a guest layer comprising a guest, a separator disposed on the adhesive layer, and a second electrode disposed on the separator, a method of manufacturing the same, and a secondary battery including the same.

The invention discloses anode slurry and a preparation method thereof, and application of anode slurry. The anode slurry contains ceramic powder, a conductive agent, an anode active material, a binderand a solvent. Because the anode slurry contains ceramic powder, the conductive agent, the anode active material, the binder and the solvent, the high-compaction anode piece prepared by the anode slurry has high liquid absorption and retention, high electrolyte wettability and capability of reducing the soaking time of the high-energy battery electrolyte. Furthermore, the ceramic powder has low cost and low price, so that the cost of the anode slurry is relatively low.