86results about How to "Excellent capacity characteristics" patented technology

Disclosed are a current collector for a flexible electrode, a method of manufacturing the same, and a negative electrode including the same. The current collector for a flexible electrode includes: a flexible polymer substrate; a cross-linkable polymer layer disposed on the polymer substrate; and a metal layer disposed on the cross-linkable polymer layer, wherein the surface of the cross-linkable polymer layer includes a plurality of protrusions and grooves.

A non-aqueous electrolyte cell equipped with an anode made of a carbonaceous material capable of intercalating and deintercalating light metal ions and imparted with high capacity characteristics and favorable cyclic properties, wherein the carbonaceous material is obtained by irradiating, in a gaseous atmosphere, an electron beam accelerated in high vacuum. The anode made of a carbonaceous material is subjected to electron beam irradiation at a dose ranging from 300 kGy to 1000 kGy.

Disclosed is a secondary battery including a cathode, an anode, a membrane and an electrolyte, wherein the cathode contains a mixture of a first cathode material defined herein and a second cathode material selected from the group consisting of a second-(a) cathode material defined herein and a second-(b) cathode material defined herein, and a combination thereof, wherein a mix ratio of the two cathode materials (first cathode material: second cathode material) is 50:50 to 90:10, and the membrane is an organic/inorganic composite porous membrane including (a) a polyolefin-based membrane substrate and (b) an active layer in which one or more areas selected from the group consisting of the surface of the substrate and a portion of pores of the substrate are coated with a mixture of inorganic particles and a binder polymer, wherein the active layer has a structure in which the inorganic particles are interconnected and fixed through a binder polymer and porous structures are formed by the interstitial volume between the inorganic particles.

The present invention aims to improve cycling characteristics with maintaining high capacity, which is a feature of lithium-nickel composite oxide, and provides a non-aqueous electrolyte secondary battery comprising a positive electrode which is configured by applying on a current collector a mixture which comprises: a lithium-containing composite oxide having a hexagonal system structure, wherein Co is substituted for part of nickel in a lithium-nickel composite oxide (the substitution percentage ranges from 5 to 30%) and, in addition, at least one kind of such elements as Al, Mn, Ti, and Mg is substituted (the substitution percentage is less than 20%); a binder; and a conductive material; and said lithium-containing composite oxide is characterized in that a half width of the (110)-plane-based diffraction peak obtained from powder X-ray diffraction method, in which CuKα line is used as characteristic X-ray, is larger than 0.13° and smaller than 0.20°, and that the ratio of the (003)-plane-based diffraction peak intensity to the (104)-plane-based diffraction peak intensity is larger than 1.2 and smaller than 1.8.

The present invention relates to negative-electrode active material for a lithium secondary battery exhibiting excellent capacity property and cycle life property, a method of preparing the same, and a lithium secondary battery using the negative-electrode active material, wherein the negative-electrode active material for a lithium secondary battery comprises a nanotube having a tube shape defined by an outer wall with a thickness of nanoscale, the outer wall of the nanotube comprises at least one non-carbonaceous material selected from the group consisting of silicon, germanium and antimony, and an amorphous carbon layer with a thickness of 5 nm or less is formed on the outer wall of the nanotube.

The present disclosure relates to a positive electrode active material which reduces lithium by-products and improves structural stability and includes a lithium-nickel based transition metal composite oxide in which an alkaline earth metal having oxidation number of +2 is doped and a phosphate coated layer formed on the outer surface of the composite oxide. Accordingly, a second battery including the positive electrode active material has excellent capacity characteristics, and also improves structural stability during charging/discharging and prevents swelling, thereby being capable of exhibiting excellent life characteristics. Therefore, the present invention may be easily applied to industry in need thereof, and particularly to electric vehicles industry requiring high capacity and long-term life characteristics.

The invention relates to a preparation method of an anode material for a lithium ion battery. Component of the anode material is LiNi0.5Mn1.5O4-deltaFx, wherein, the delta equals 0.5x, and x is not less than 0.01 and not more than 0.08; the anode material is prepared by combining gel and lithium peroxide under high-temperature heat treatment; the process is simple and the preparation course is easy to be controlled. The first discharge capacity of the material can reach 140mAh/g<-1>, wherein, 5V voltage platform characteristic is obviously improved, and 4V voltage platform is well removed, the charge and discharge efficiency reach more than 96% after repeating the previous cycles, and the material has excellent cycle performance.

The present invention provides a positive electrode active material for secondary battery and a secondary battery including the same. The positive electrode active material includes a core including a lithium composite metal oxide of Formula 1 below, a first surface-treated layer positioned on the surface of the core and including a lithium oxide of Formula 2 below, and a second surface treated layer positioned on the core or the first surface-treated layer and including a lithium compound of Formula 3. Thus, the present invention can improve capacity characteristics and output characteristics of a battery and also reduce the generation of gas,

Li_aNi_1-x-yCo_xM1_yM3_zM2_wO₂   [Formula 1]

Li_mM4O_(m+n)/2   [Formula 2]

Li_pM5_qA_r   [Formula 3]

(in formulae 1 to 3, A, M1 to M5, a, x, y, z, w, m, n, p, and q are the same as those defined in the specification).

Provided are a negative electrode active material including spherical artificial graphite and natural flake graphite, wherein the spherical artificial graphite and the natural flake graphite are included in a weight ratio of 80:20 to 95:5, and a negative electrode for a lithium secondary battery including the same.

The present disclosure relates to a positive electrode material including a spinel-structured lithium manganese-based first positive electrode active material and a lithium nickel-manganese-cobalt-based second positive electrode active material, wherein the first positive electrode active material includes a lithium manganese oxide represented by Formula 1 and a coating layer which is disposed on a surface of the lithium manganese oxide, the second positive electrode active material is represented by Formula 2, and an average particle diameter of the second positive electrode active material is greater than an average particle diameter of the first positive electrode active material, and a positive electrode and a lithium secondary battery which include the positive electrode material:

Li_1+aMn_2-bM¹_bO_4-cA_c  [Formula 1]

Li_1+x[Ni_yCo_zMn_wM²_v]O_2-pB_p  [Formula 2]

The negative active material for a non-aqueous rechargeable battery includes a main component of lithium vanadium oxide, and at least one selected from the group consisting of Li₃VO₄, vanadium carbide, and mixtures thereof. The Li₃VO₄ is included in an amount of 0.5 to 3.0 wt % based on the total weight of the negative active material, and the vanadium carbide is included in amount of 0.5 wt % or less based on the total weight of the negative active material. The negative active material can improve discharge capacity of the non-aqueous rechargeable battery.

Provided is a manufacturing method of a lithium-titanium composite oxide doped with different metals, solid-phase mixing after adjusting a mixing ratio of two kinds of different metals and pulverizing the same, and spray drying the same to adjust contents of impurities, and a lithium-titanium composite oxide doped with different metals manufactured therefrom. By doping two kinds of different metals on the surface of the lithium-titanium composite oxide after adjusting the ratio of the two different metals to be a desirable ratio, the contents of rutile-type titanium dioxide, anatase-type titanium dioxide and Li₂TiO₃ which have been included as impurities are reduced, thereby manufacturing titanium dioxide having excellent capacity characteristics and structural characteristics, and a battery including the titanium dioxide having excellent battery characteristics of high initial charge and discharge efficiency and rate capability.

An object of the present invention or a problem to be solved by the present invention is to provide, as a material for use as a positive electrode of a sodium secondary battery, a novel material that allows the resulting battery to have capacity characteristics superior to those of conventional batteries. The composite metal oxide of the present invention has a composition represented by the general formula Na_xMe_yO₂, where Me is at least one selected from the group consisting of Fe, Mn, and Ni, x satisfies 0.8<x≦1.0, and y satisfies 0.95≦y<1.05, and consists of a P2 structure. The sodium secondary battery of the present invention includes: a positive electrode (13) containing the composite metal oxide of the present invention; a negative electrode (16) containing a material capable of absorbing and desorbing Na ions; and an electrolyte containing Na ions and anions.

Provided are an anode active material for a lithium secondary battery including a silicon-based composite formed of silicon (Si) and crystalline SiO₂, wherein the Si and crystalline SiO₂ are in the form of grains, a method of preparing the same, and a lithium secondary battery including the anode active material.

Since an anode active material according to an embodiment of the present invention includes a silicon-based composite including Si and SiO₂ in a grain state and the SiO₂ is crystalline SiO₂, the reaction between amorphous SiO₂ and lithium in an electrolyte may be excluded. Thus, since the crystalline SiO₂ is included in the silicon-based composite, excellent capacity characteristics of a secondary battery may be maintained and initial efficiency and life characteristics may be improved when the silicon-based composite is used as an anode active material.

A web of superabsorbent polymer and fiber made by an in situ neutralization, wet-laid process, wherein the degree of neutralization of the superabsorbent polymer is partial, preferably less than about 80 mol %. The web exhibits an excellent centrifuge retention capacity property, as compared to prior webs of superabsorbent polymer and cellulosic fiber made by in situ neutralization, wherein the degree of neutralization is total, such as 100 mol % or more.

Disclosed are a method of preparing a negative active material for a rechargeable lithium battery that includes: preparing a powder including a material being capable of doping and dedoping lithium; coating the powder including the material being capable of doping and dedoping lithium with metal particles; and etching the powder including the material being capable of doping and dedoping lithium and coated with the metal particles, a negative active material for a rechargeable lithium battery prepared in this method, and a rechargeable lithium battery including the negative active material.