Titles:
SEPARATOR HAVING POROSITY DIFFERENCE ACCORDING TO THICKNESS DIRECTION AND MANUFACTURING METHOD THEREFOR
두께 방향에 따라 공극률 차이가 있는 분리막 및 이의 제조방법
Abstracts:
The invention of the present application relates to a separator for a secondary battery, the separator comprising a separator main body comprising polyolefin and having a porous structure, wherein the separator main body is in a form in which there is a difference in porosity in the thickness direction. The separator can improve the problem of ionic conductivity imbalance, which occurs according to differences in thickness, electrical conductivity, and the like of a positive electrode and a negative electrode.
본원발명은 이차전지용 분리막으로서, 상기 분리막은 폴리올레핀을 포함하고 다공성 구조의진 분리막 본체를 포함하며, 상기 분리막 본체는 두께 방향에 따라 공극률 차이가 있는 형태로 이루어진 분리막에 대한 것으로서, 양극과 음극의 두께 및 전기전도성 등의 차이에 따라 발생하는 이온 전도도의 불균형 문제를 개선할 수 있다.
Applicant:
LG CHEMICAL LTD [KR] (주식회사 엘지화학)
Inventor:
MIN JI WON [KR] (민지원)
Other family members:
KR 20210033692 A,
Pub. Date: 2021-03-29,
EPO/ Google
Titles:
SEPARATOR FOR SQUARE-SHAPED NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY, LAYERED ELECTRODE PRODUCT, AND SQUARE-SHAPED NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY
角缶型非水電解質二次電池用セパレータ、電極積層体、及び角缶型非水電解質二次電池
Abstracts:
This separator for a square-shaped non-aqueous electrolyte secondary battery is obtained by layering a porous layer on a microporous polyolefin film. The microporous film satisfies formulae (1) to (3). The porous layer satisfies the formula (4) and contains inorganic particles and a swellable resin containing a vinylidene fluoride copolymer in which the content of hexafluoropropylene is 2.5-6.0 mol%. Formula (1): 8 ≤ t ≤ 20 (t is the thickness (μm) of the microporous polyolefin film) Formula (2): 0.09 ≤ N ≤ 0.14 (N is the nanoindentation value of the microporous polyolefin film) Formula (3): C ≤ 4.0 (C is the creep value of the microporous polyolefin film) Formula (4): 0.55 ≤ Q ≤ 1.10 (Q is the weight per unit area (g/m2 of a resin component in the porous layer)
Titles:
Lithium ion battery diaphragm with alternating coating structure and preparation method thereof
一种具有交替涂层结构的锂离子电池隔膜及其制备方法
Abstracts:
The invention relates to the technical field of lithium ion batteries, and discloses a lithium ion battery diaphragm with an alternating coating structure and a preparation method thereof. The lithium ion battery separator includes a base film and a coating coated on one or both sides of the base film. The coating includes a ceramic coating and a PVDF-ceramic mixture coating; the ceramic coating and a PVDF-ceramic mixture coating The layers are arranged at intervals in the same coating plane, and the two edges of the coating are PVDF-ceramic mixture coatings; the area of the PVDF-ceramic mixture coating accounts for 30% to 90% of the entire coating area. By arranging the ceramic coating and PVDF-ceramic mixture coating at intervals, the lithium ion battery separator of the present invention can maintain sufficient heat-resistant shrinkage performance of the separator and sufficient adhesion between the separator and the pole piece, while improving the electrolyte performance. Wetting property, thereby reducing the DC internal resistance of lithium-ion batteries.
