Separator for rechargeable battery, method of preparing the same and rechargeable lithium battery including the same
US-2021005861-A1 · Jan 7, 2021 · US
Separator for electrochemical device, electrochemical device comprising separator and method for preparing separator
US12531311B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12531311-B2 |
| Application number | US-202017760809-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 16, 2020 |
| Priority date | Oct 18, 2019 |
| Publication date | Jan 20, 2026 |
| Grant date | Jan 20, 2026 |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
Disclosed is a separator which essentially includes inorganic particles and a binder resin, can be used as a free standing type separator including no separator substrate, such as a polymer resin film, and causes no problem of heat shrinking. In addition, the separator has increased tensile strength by virtue of the improvement of the crystallinity of the binder resin through elongation, and shows a small dimensional change after being impregnated with an electrolyte.
First claim
Opening claim text (preview).
What is claimed is: 1 . A free standing separator for an electrochemical device consisting of an insulating porous layer, wherein the insulating porous layer comprises inorganic particles and a binder resin, the insulating porous layer comprises the inorganic particles in an amount of 70-90 wt % based on 100 wt % of the insulating porous layer, the binder resin comprises polyvinylidene fluoride homopolymer in an amount of 70 wt % or more based on 100 wt % of the binder resin, and the binder resin has a crystallinity of 62% or more. 2 . The free standing separator for an electrochemical device according to claim 1 , wherein the inorganic particles are bound to each other with the binder resin, and the insulating porous layer has pores derived from the interstitial volumes among the inorganic particles. 3 . The free standing separator for an electrochemical device according to claim 1 , wherein the inorganic particle comprises at least one selected from the group consisting of Al 2 O 3 , AlOOH, Al(OH) 3 , AlN, BN, MgO, Mg(OH) 2 , SiO 2 , ZnO, TiO 2 and BaTiO 3 . 4 . The free standing separator for an electrochemical device according to claim 1 , wherein the inorganic particles have an average particle diameter of 0.001-3 μm. 5 . The free standing separator for an electrochemical device according to claim 1 , wherein the polyvinylidene fluoride homopolymer has a molecular weight (Mw) of 600,000-2,000,000 g/mol. 6 . A method for manufacturing the free standing separator according to claim 1 , comprising elongating the insulating porous layer in at least one direction. 7 . The method according to claim 6 , wherein the insulating porous layer has a rectangular planar shape having a ratio of width to length of larger than 1, and the at least one direction comprises a transverse direction, a longitudinal direction or both directions. 8 . The method according to claim 6 , wherein the elongating the insulating porous layer is carried out under warming. 9 . The method according to claim 8 , wherein the elongating the insulating porous layer is carried out at a temperature ranging from the glass transition temperature of the binder resin to a melting point of the binder resin.
Assignees
Inventors
Classifications
Manufacturing processes of separators, membranes or diaphragms · CPC title
Manufacturing or production processes characterised by the final manufactured product · CPC title
Energy storage using batteries · CPC title
of plates or sheets · CPC title
Tensile strength · CPC title
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US12531311B2 cover?
- Disclosed is a separator which essentially includes inorganic particles and a binder resin, can be used as a free standing type separator including no separator substrate, such as a polymer resin film, and causes no problem of heat shrinking. In addition, the separator has increased tensile strength by virtue of the improvement of the crystallinity of the binder resin through elongation, and sh…
- Who is the assignee on this patent?
- Lg Energy Solution Ltd, Lg Energy Solutions Ltd
- What technology area does this patent fall under?
- Primary CPC classification H01M50/434. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jan 20 2026 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 7 related publications on this page (citations in our corpus or others sharing the same primary CPC).