8results about How to "High Capacity Features" patented technology

The invention discloses a preparation method and application of a porous heterojunction vanadium-based aqueous zinc battery positive electrode, firstly, FeCI3. 6H2O and fumaric acid are dissolved in deionized water respectively and stirred vigorously, suspension liquid is transferred into a round-bottom flask for oil bath, and washing and drying are performed after cooling to obtain a product MIL-88A; dissolving NH4VO3 in deionized water, and stirring in an oil bath until NH4VO3 is completely dissolved; the preparation method comprises the following steps: dispersing MIL-88A in ethanol, dropwise adding into an NH4VO3 solution, and stirring; after cooling to room temperature, centrifuging a solid product with water and ethanol respectively, finally performing vacuum drying, and heating by using a muffle furnace to obtain FeVO porous heterojunction oxide; the positive electrode material can reduce the diffusion barrier of zinc ions, improve the electron transport generated by a built-in electric field formed at an interface, and significantly improve the rate capability, and the porous structure formed by triggering can reduce the diffusion barrier and improve the stability of the positive electrode structure of the aqueous zinc battery.

The application discloses a preparation method of a polyanionic sodium ion battery positive electrode material, and comprises the following steps: S1, preparation of a precursor solution: a transition metal M source, an acid solution and a complexing agent are mixed and dissolved to form a precursor solution; S2, preparation of a pre-oxidized precursor solution: an oxidizing agent is added to the solution to generate a pre-oxidized precursor solution; S3, preparation of M(OH)x precipitation: a pH value of the pre-oxidized precursor solution is adjusted so that transition metal ions in the solution are precipitated in the form of M(OH)x; S4, preparation of a precursor powder: the M(OH)x precipitation, a sodium source, a phosphorus source and a carbon source are mixed wetly to obtain a precursor slurry; S5, drying of the precursor powder: the precursor slurry is dried and separated to obtain a dried precursor powder; and S6, high-temperature sintering: the precursor powder is sintered at a high temperature to obtain a polyanionic material. The polyanionic sodium ion battery positive electrode material has the characteristics of excellent electrochemical performance, high compaction density and low cost.

The present invention relates to a positive electrode active material which includes 25% to 80% of crystallites C having high crystallite long-axis orientation degree and low crystallite c-axis orientation degree in the outer region of the positive electrode active material, and thus has high capacity characteristics and a small amount of gas generated.

The present invention relates to a method for activating a lithium secondary battery comprising a positive electrode, a negative electrode, and an electrolyte, in which the lithium secondary battery comprises a positive electrode active material made of a lithium metal oxide containing manganese in an amount of 50 mol% or more but less than 100 mol% based on the total metal content excluding lithium, the method includes activating the lithium secondary battery by a CC-CV charging method in which constant current (CC) charging is performed until a specified state of charge (% SOC) is reached, and then constant voltage (CV) charging is performed, in which the CC-CV charging of the activation step ends at a point in time at which an activation charging depth defined by the following mathematical formula 1 becomes 5.17% to 15.00%, [Mathematical formula 1] Depth of charge for activation (%) = (charge capacity for CV charge interval / total charge capacity for activation step) * 100.

The present invention relates to a positive electrode active material for a lithium secondary battery, a method for preparing the same, and a lithium secondary battery comprising the same, the method comprising the steps of: (a) respectively preparing a first raw material containing a lithium-containing raw material and a second raw material containing at least one material selected from the group consisting of a nickel-containing raw material, a cobalt-containing raw material, a manganese-containing raw material, an iron-containing raw material, and an aluminum-containing raw material; (b) preparing a nanoslurry by wet nanogrinding a solution in which the first raw material and the second raw material are dissolved and dispersed; (c) preparing nanoparticles by mechanically drying the nanoslurry after the nanoslurry is introduced into a planetary dispersion mixer; and (d) firing the mechanically dried nanoparticles to produce a lithium-containing compound having a single crystal shape.

An anode active material for a lithium secondary battery and a lithium secondary battery including the same are provided. The anode active material includes a silicon-based active material particle, and a plurality of composite particles each including a carbon coating layer formed on at least a portion of a surface of the silicon-based active material particle, wherein a relative standard deviation of G / Si peak intensity ratios of a Raman spectrum as defined in Equation 1 measured for each of 50 different composite particles among the plurality of composite particles is 50% or less.

The present application relates to a lithium secondary battery negative electrode comprising a pattern and a lithium secondary battery comprising the same. The lithium secondary battery negative electrode includes a negative electrode current collector layer and a negative electrode active material layer formed on one surface or both surfaces of the negative electrode current collector layer, the negative electrode active material layer including a pattern portion and satisfying relationship 1. [Relation 1] 5 < = [B / (A + B)] * 100 (%) < = 30 In Relation 1, A is the volume of the negative electrode active material layer, and B is the volume of the pattern portion of the negative electrode active material layer.