1096results about "Positive electrodes" patented technology

The application specifically discloses a phosphate-based positive electrode material and a preparation method and application thereof. The phosphate-based positive electrode material comprises base particles and a carbon coating layer coated on the surface of the base particles; the chemical formula of the base particles is Li x M y PO4, 0.96≤x≤1.08, 0.96≤y≤1, M comprises at least one of Fe and Mn; wherein, the M site is doped with a first metal element, the first metal element comprises at least one of Ti, V, Cr, Co, Ni, Nb, Mo and W; and / or, the Li site is doped with a second metal element, the second metal element comprises at least one of Mg and Zr; the carbon coating layer comprises a carbon material, and the degree of disorder I D / I G of the carbon material is ≤1.2. The application has the advantages of improving the electrochemical performance of the phosphate-based positive electrode material and reducing the ion elution rate thereof.

Provided is a battery including a positive electrode layer, a negative electrode layer, and an electrolyte layer disposed between the positive electrode layer and the negative electrode layer, in which the electrolyte layer contains a polymer having an ability to preferentially conduct metal ions, and a thickness ratio between the positive electrode layer and the electrolyte layer is 10:1 to 0.5:1.

Reduction of initial resistance. [Solution] A positive electrode active material comprising a layered lithium transition metal composite oxide, wherein the volume-based particle size distribution of the positive electrode active material is 0.1

An embodiment provides a stacked all-solid-state secondary battery in which a plurality of battery units in which a positive electrode layer, a solid electrolyte layer, and a negative electrode layer are sequentially stacked are stacked along the stacking direction, wherein a buffer layer formed between the adjacent battery units.

A positive electrode active material may include a first positive electrode active material comprising a first lithium transition metal composite oxide and having an average particle diameter D50 from 9 µm to 20 µm and may comprise a second positive electrode active material comprising a second lithium transition metal composite oxide and having an average particle diameter D50 from 1 µm to 8 µm. A particle diameter D20 of the positive electrode active material may be from 1.0 µm to 5.0 µm.

Secondary battery, characterized in that the secondary battery comprises a cathode foil and an anode foil, wherein the cathode foil comprises an active cathode material, the active cathode material comprising an olive-like phosphate and a lithium-containing oxide; wherein the secondary battery satisfies the following: (a×b) / c = 0.6 to 5; where a denotes a slope of a curve segment between a first oxidation plateau and a second oxidation plateau on a charging curve with a unit of V, obtained at 25°C within an operating voltage range of 2.5 V to 4.25 V; wherein a voltage range of the first oxidation plateau is 3.3 to 3.5 V, while a voltage range of the second oxidation plateau is 4.0 to 4.1 V; where b ↑a volume-phase lithium-ion transport impedance of the cathode foil in an EIS test at a SOC value corresponding to a minimum value between a first curve peak and a second curve peak of a dQdV-V curve at 25°C within the operating voltage range of 2.5 V to 4.25 V; where c denotes a decay rate of an anode potential during a charging process of the secondary battery at 25°C within the operating voltage range of 3.7 V to 4.25 V with a unit of V-1.

The present invention relates to a lithium secondary battery positive electrode active material and a method for producing a positive electrode active material. The positive electrode active material of the present invention comprises lithium metal oxide particles comprising lithium, nickel, cobalt, and manganese, and satisfies the following formula 1. <Formula 1> A-B ≤ 1.30 In the formula 1, A is the sum of the values of fine powder of 1 μm or less after 3 g of the positive electrode active material as a test sample is put into a mold having a diameter of 1.3 cm and is pressed with a pressure of 9 tons (ton), and B is the sum of the values of fine powder of 1 μm or less before the pressing.

The application discloses a pyrite-based composite positive electrode material, a preparation method thereof and application of the pyrite-based composite positive electrode material in a full-solid-state battery, and relates to the technical field of battery materials. The preparation method of the pyrite-based composite positive electrode material comprises the following steps: (1) performing shock ball milling treatment on pyrite block crystals to obtain iron sulfide powder; (2) mixing lithium sulfide and lithium iodide, and then performing high-energy ball milling treatment to obtain a lithium iodine sulfur amorphous mixture; and (3) mixing the iron sulfide powder and the lithium iodine sulfur amorphous mixture, and then performing high-energy ball milling treatment to obtain the pyrite-based composite positive electrode material. The pyrite-based composite positive electrode material is combined with a solid electrolyte membrane and a lithium indium negative electrode, and a pyrite composite positive electrode sulfide full-solid-state battery with high capacity and low attenuation can be prepared, and the pyrite composite positive electrode sulfide full-solid-state battery exhibits high specific capacity and long cycle performance.

This invention belongs to the technical field of lithium-ion battery cathode materials, specifically relating to a sulfonic acid-based organic polymer, a sulfonic acid-based organic polymer / carbon nanotube composite material, its preparation method, and its application. The sulfonic acid-based organic polymer is prepared by a dehydration condensation reaction of 2,5-diaminobenzenesulfonic acid and hexaazabenzophenanthrene hexacarboxylic acid trianal. When used as a lithium-ion battery cathode material, it exhibits high specific capacity and excellent cycle stability, overcoming the solubility problem of organic cathode materials in electrolytes. When the sulfonic acid-based organic polymer is combined with carbon nanotubes and applied to lithium-ion battery cathode materials, battery performance is significantly improved, and the capacity remains stable even after long-term cycling. The synthesis methods of the sulfonic acid-based organic polymer and the sulfonic acid-based organic polymer / carbon nanotube composite material of this invention are simple, have abundant raw material sources, and good reproducibility, making them suitable for industrial production and possessing broad application prospects in the field of lithium-ion batteries.

Lithium secondary battery, comprehensive a positive electrode, a negative electrode, a separator and a non-aqueous electrolyte, wherein: the positive electrode comprises a positive electrode active material, wherein the positive electrode active material comprises lithium iron phosphate particles and the positive electrode has a loading amount of 450 mg / 25 cm² 2 up to 740 mg / 25 cm 2 exhibits; and the non-aqueous electrolyte comprises a lithium salt, an organic solvent and an additive, wherein the organic solvent comprises a solvent based on a cyclic carbonate and a solvent based on a linear carbonate, wherein the solvent based on a cyclic carbonate comprises ethylene carbonate and the solvent based on a linear carbonate comprises dimethyl carbonate, the additive comprises vinylene carbonate and the dimethyl carbonate is present in an amount of 5 vol% to 75 vol% in the organic solvent and the weight ratio of vinylene carbonate to dimethyl carbonate is greater than 0 to 0.2 or less.

A cathode for a lithium secondary battery and a lithium secondary battery comprising the cathode are provided. The cathode comprises a cathode current collector, and a cathode active material layer comprising a cathode active material on at least one surface of the cathode current collector. A G value and measured at a surface of the cathode active material layer is less than 2.0.

The present invention relates to a positive electrode for a lithium secondary battery, which includes a positive electrode active material layer containing: a first positive electrode active material represented by Formula 1 and having a grain size of 150 nm or more, a conductive agent containing single-walled carbon nanotubes (SWCNTs), and a binder, and to a lithium secondary battery including the positive electrode.

The present application relates to ternary high-nickel lithium-ion battery cathode materials and a preparation method thereof. The general expression of the cathode material is Li(Ni 1‑a‑b‑c Co a Mn b D c )O2, 0.01

The application provides a ternary positive electrode material, a preparation method and application thereof; the ternary positive electrode material comprises a base and a coating on the surface of the base; the base is a ternary material co-doped with titanium elements and nitrogen elements; and the coating is titanium nitride. In the application, titanium nitride is used as a coating agent and a dopant, so that the Ti elements and the N elements are co-doped into the crystal lattice of the ternary material, and titanium nitride is coated on the surface of the ternary material; the doping and the coating have a synergistic effect, so that the prepared ternary positive electrode material has better cycle rate performance and high-temperature storage performance.

The nonaqueous electrolyte secondary battery according to the present application includes a storage container having a positive electrode can, a gasket, and a negative electrode can, and a power generating element containing an electrolyte. The positive electrode can is formed in a bottomed cylindrical shape having a bottom wall portion and an outer wall portion. The negative electrode can is formed in a toped cylindrical shape having a top wall portion and an inner wall portion. A portion of the outer wall portion on the top wall portion side is a calked portion 12b that is curved toward the inner wall portion side with a curvature radius R from the bottom wall portion side to an opening end edge of the outer wall portion. The nonaqueous electrolyte secondary battery has a diameter of 4.6 mm to 5.0 mm. A height H2 of the positive electrode can is in a range of 74% to 79% relative to a height H1 of the nonaqueous electrolyte secondary battery. The curvature radius R of the calked portion is in a range of 0.7 mm to 1.1 mm.

An electrochemical apparatus includes a separator, a positive electrode plate, and an electrolyte solution, where the separator includes a porous layer, and an average pore diameter of the porous layer is 0.5 μm to 18 μm; the electrolyte solution includes propyl propionate, and based on a mass of the electrolyte solution, a mass content of propyl propionate is 25% to 55%; and the positive electrode plate includes a positive active material layer, the positive active material layer includes a conductive agent, the conductive agent includes at least one of conductive carbon black or Ketjen black, and a specific surface area of the conductive agent is 600 m2 / g to 1100 m2 / g.

The present application provides a positive electrode plate, a secondary battery, a battery module, a battery pack, and a power consumption device. The positive electrode plate includes a current collector, an undercoat layer disposed on at least one surface of the current collector, and a positive electrode film disposed on the undercoat layer, and the undercoat layer includes a polymer A soluble in an aqueous solvent, the polymer A including a structural unit derived from a cyano group-containing monomer, a structural unit derived from an amide group-containing monomer, and a structural unit derived from an ester group-containing monomer. The present application uses the polymer A in the undercoat layer of the positive electrode plate to improve the molding quality, adhesion, and flexibility of the positive electrode plate, and optimize the cycle performance of the battery.

An object is to provide a method for manufacturing a positive electrode active material that achieves high powder properties and high load resistance (e.g., rate performance and output resistance) when used in a lithium-ion secondary battery, within a short manufacturing cycle time and at low cost. To perform heat treatment at temperatures lower than the melting point of magnesium fluorine, lithium fluoride is mixed to melt magnesium fluorine and modify the surface of lithium cobalt oxide powder. By mixing lithium fluoride, magnesium fluorine can be melted at a temperature lower than its melting point, and a positive electrode active material is formed utilizing this eutectic phenomenon.

Disclosed herein is a process for removing water from a particulate material selected from (oxy)hydroxides and carbonates containing at least one of nickel, cobalt, and at least one metal other than nickel. The process includes the step of introducing at least one particulate material with a water content in the range of from 1 to 30% by weight, referring to said particulate material, into a rotary kiln with external heating elements and moving it through the rotary kiln together with a flow of a gas. The residual moisture of the resultant product is in the range of from 50 ppm to 1.5% by weight.

A positive active material for a rechargeable lithium battery, a preparing method thereof, and a rechargeable lithium battery including the same are provided. The positive active material for a rechargeable lithium battery includes a first positive active material including a first lithium nickel-based composite oxide and including secondary particles formed by aggregation of a plurality of primary particles and a cobalt coating portion on the surface of the secondary particles; and a second positive active material including a second lithium nickel-based composite oxide and including individual particles and a cobalt coating portion on the surface of the individual particles, wherein the second positive active material has an uneven surface having concavo-convex features and an even surface that is substantially flat.

The present invention proposes a positive electrode for a secondary battery, the positive electrode including a positive electrode current collector and a positive electrode mixture layer on the positive electrode current collector, the positive electrode including: a coated portion at which the positive electrode mixture layer is formed in a uniform thickness; an uncoated portion provided on at least one edge of the coated portion on the positive electrode current collector and at which the positive electrode mixture layer is not formed; and a buffer portion between the coated portion and the uncoated portion, at which the positive electrode mixture layer is formed in a thickness smaller than that of the coated portion.

The present invention relates to: [1] a non-aqueous electrolyte comprising a compound (A) represented by general formula (1), and an anion (B) represented by general formula (2), the mass ratio [(A) / (B)] being 0.01-1.2, inclusive; and [2] a non-aqueous electrolyte battery provided with the non-aqueous electrolyte, a negative electrode, and a positive electrode having positive electrode active material that can store and release lithium ions.

The present disclosure provides a manufacturing method for the electrode including the electrode mixture layer and the protection layer adjacent thereto on a current collector foil. The manufacturing method includes coating the current collector foil with an electrode mixture slurry and a protection layer formation slurry using a die head including a shim; and drying these slurries. The protection layer formation slurry is subjected to die coating simultaneously with the electrode mixture slurry so that the protection layer formation slurry is adjacent to the electrode mixture slurry. The shim includes a discharge port for discharging the electrode mixture slurry and a discharge port for discharging the protection layer formation slurry. A ratio (B / A) of an opening width B of the discharge port for discharging the protection layer formation slurry to a coating width A of the protection layer formation slurry is 1.00 to 1.07.

The epsilon polymorph of vanadyl phosphate, ε-VOPO4, made from the solvothermally synthesized H2VOPO4, is a high-density cathode material for lithium-ion batteries optimized to reversibly intercalate two Li-ions to reach the full theoretical capacity at least 50 cycles with a coulombic efficiency of 98%. This material adopts a stable 3D tunnel structure and can extract two Li-ions per vanadium ion, giving a theoretical capacity of 305 mAh / g, with an upper charge / discharge plateau at around 4.0 V, and one lower at around 2.5 V.

The present invention relates to a lithium secondary battery positive electrode active material comprising a lithium metal oxide in the form of single particles and a coating layer containing cobalt disposed on the surface of the lithium metal oxide, the coating layer being attached to the surface of the lithium metal oxide in the form of islands comprising a plurality of mutually spaced attached particles, the average coating rate of the coating layer being 35 to 48 area% based on the total surface area of the single particles.

The positive electrode active material includes olivine lithium manganese iron phosphate. The olivine lithium manganese iron phosphate includes a dopant at a manganese-iron site. At the manganese-iron site, the dopant satisfies a relationship of “dFe-X<dMn-X”. The term “dFe-X” represents a nearest-neighbor atomic distance between the dopant and iron. The term “dMn-X” represents a nearest-neighbor atomic distance between the dopant and manganese.

The present invention relates to a positive electrode for a secondary battery which includes a lithium transition metal oxide containing nickel; a first binder including a linear polymer; and a second binder including a branched polymer, wherein the linear polymer includes a hydrogen-bondable functional group, the branched polymer has 3.0 or less branches per 1,000 carbon atoms, and a weight ratio of the first binder to the second binder is in a range of 1:0.26 to 1:0.85, and a positive electrode and a lithium secondary battery which include the same.

The present invention relates to a lithium secondary battery cathode material, and the lithium secondary battery cathode material of the present invention includes a cathode active material, and the cathode active material includes lithium metal oxide particles containing lithium, nickel, cobalt, and manganese, and the average roughness (Ra) of the surface of the cathode material can be 1.0 μm or less in a first roughness measured by the average value of the active material within a randomly selected 40 μm x 40 μm range.

The present disclosure relates to a polymer solid electrolyte composition for a lithium secondary battery and a use thereof. Particularly, the present disclosure relates to a polymer solid electrolyte composition for a lithium secondary battery, a polymer solid electrolyte for a lithium secondary battery, and a lithium secondary battery. The present disclosure can simultaneously improve the ionic conductivity and mechanical strength of a polymer electrolyte.

To provide a positive electrode material capable of manufacturing a lithium ion secondary battery in which the initial decrease in battery capacity is suppressed and the decrease in battery capacity due to repeated charging and discharging is suppressed, as well as a lithium ion secondary battery manufactured using the positive electrode material.SOLUTION: A positive electrode material includes a positive electrode active material and two or more kinds of lithium alloys, each of which contains a metal element having an alloying potential with lithium of 0.5 V (vs. Li / Li+) or more.SELECTED DRAWING: None