CHANG CHUN PETROCHEMICAL CO., LTD.

An ethylene-vinyl alcohol copolymer composition, a single-layer film and a multilayer structure containing the same. The ethylene-vinyl alcohol copolymer composition includes an ethylene-vinyl alcohol copolymer, an antioxidant, and a fluorine-containing compound; and the ratio of the antioxidant content to the fluorine content is 0.5 to 65. Thereby, the film containing said ethylene-vinyl alcohol copolymer composition not only has good heat resistance, but also can avoid the situation that a large number of gels are generated during the preparation process.

The instant disclosure relates to saponified pellets of an ethylene-vinyl ester based copolymer as well as a film and a multilayer structure formed therefrom. The saponified pellets of an ethylene-vinyl ester based copolymer has an ethylene content of 24-35 mole %, and the pellets have a turbidity of less than 300 NTU when dissolved in a 60% (w/w) methanol aqueous solution; or the pellet has an ethylene content of 36-48 mole %, and the pellets have a turbidity of less than 200 NTU when dissolved in a 80% (w/w) methanol aqueous solution. The present invention controls the amount of aggregates by controlling the turbidity of the saponified pellets of an ethylene-vinyl ester based copolymer dissolved in methanol aqueous to reduce the amount of gel produced after film formation.

Provided is a copper foil, including 2 ppm to 21 ppm silver, 0.5 ppm to 5.5 ppm titanium, and 2 ppm to 80 ppm sulfur, wherein an orientation index of (220) surface of the copper foil is from 2.05 to 3.08. Also provided are a current collector for a lithium ion secondary battery and a lithium ion secondary battery.

Provided is a surface-treated copper foil for a lithium ion secondary battery, including a copper layer having a first side and an opposite second side and nickel-containing treatment layers disposed on the first side and the second side of the copper layer respectively, wherein a nickel coating amount on each side of the copper layer is ≥3.0 10 4 μg/dm 2 , and each treatment layer provides a treated surface with lightness value (L*) of color space of 30 to 60 and reduced dale height (Svk) of 0.10 to 0.65 μm. Provided also are a current collector for a lithium ion secondary battery and a lithium ion secondary battery.

A copper foil is provided, including 5 ppm to 25 ppm silver. 0.5 ppm to 8 ppm titanium, and 5 ppm to 85 ppm sulfur. Also provided are a current collector for a lithium ion secondary battery and a lithium ion secondary battery.

A carrier-attached ultra-thin copper foil and a method for manufacturing the same are provided. The method includes modifying a polymer substrate with an amine-based polymer compound to form a modification layer on at least one surface of the polymer substrate. A palladium catalyst is then used to activate the modification layer, thereby forming an activation layer on the modification layer. Subsequently, an ultra-thin copper foil is formed on the activation layer, in which the polymer substrate can be separated from the ultra-thin copper foil via the modification layer and the activation layer.

Provided is an copper foil for lithium ion secondary batteries having two opposite sides, wherein the copper foil has a texture coefficient of crystal plane (220) “TC (220)” of ≥1.36 and a texture coefficient of crystal plane (311) “TC (311)” of ≥0.79. The present disclosure further provides a current collector for lithium ion secondary batteries and a lithium ion secondary battery including the same.

A manufacturing method of a solid copper-carbon catalyst includes the following steps: providing a copper precursor solution, performing a spraying step, performing a drying step, and performing a calcining step. The copper precursor solution includes a copper precursor, a carbon carrier and a first solvent. In the spraying step, the copper precursor solution is dispersed to form a plurality of copper precursor drops. In the drying step, the copper precursor drops are dried to form a plurality of copper precursor powders. In the calcining step, the copper precursor powders are calcined to form a plurality of solid copper-carbon catalysts.

An ethylene-vinyl alcohol copolymer (EVOH) resin particle composition, an EVOH film formed therefrom, and a multilayer structure containing the same. The EVOH resin particle composition includes: a first EVOH resin particle having a peak material volume (Vmp) of 0.00001˜6 μm 3 /μm 2 ; and a second EVOH resin particle having a peak material volume (Vmp) of 0.00015˜20 μm 3 /μm 2 . This can improve the workability and mechanical properties of the EVOH composition when it is made into a film.

A polymer film including a first portion and a second portion laminated with the first portion. Each portion independently consists of one or more layers. The first and second layers each independently have a melt index ranging from 3.5 g/10 min to 10.0 g/10 min, and lower than 3.5 g/10 min, respectively. Each layer of the first portion independently has a product of its melt index and a thickness ratio of its thickness to the total thickness of the first and second portions, such that the sum of the product of each layer of the first portion ranges from 0.39 g/10 min to 2.50 g/10 min. Each layer of the second portion independently has a product of its melt index and a thickness ratio of its thickness to the total thickness of the first and second portions, such that the sum of the product of each layer of the second portion ranges from 1.10 g/10 min to 2.95 g/10 min.