Separator for rechargeable lithium battery, negative electrode-separator assembly and rechargeable lithium battery

Patent metadata

Field	Value
Publication number	US-2024162565-A1
Application number	US-202318229587-A
Country	US
Kind code	A1
Filing date	Aug 2, 2023
Priority date	Nov 2, 2022
Publication date	May 16, 2024
Grant date	—

Abstract

A separator for a rechargeable lithium battery, negative electrode-separator assembly for a rechargeable lithium battery, and rechargeable lithium battery are provided. The separator includes a ceramic layer including ceramic particles and a binder, and a functional layer on the ceramic layer including inorganic particles having a working potential (vs Li/Li+) of greater than or equal to about 1 V and a binder.

First claim

What is claimed is:

1 . A separator for a rechargeable lithium battery, the separator comprising:
a ceramic layer comprising ceramic particles and a binder, and a functional layer on the ceramic layer and comprising inorganic particles having a working potential (vs Li/Li + ) of greater than or equal to about 1 V and a binder.

2 . The separator of claim 1 , wherein
a thickness of the ceramic layer is about 1 μm to about 100 μm, and a thickness of the functional layer is about 1 μm to about 20 μm.

3 . The separator of claim 1 , wherein the ceramic particles comprise at least one selected from among silicon oxide, aluminum oxide, boehmite, zinc oxide, zirconium oxide, zeolite, titanium oxide, barium titanate, strontium titanate, calcium titanate, aluminum borate, calcium carbonate, barium carbonate, lead oxide, cerium oxide, calcium oxide, magnesium oxide, niobium oxide, tantalum oxide, tungsten oxide, aluminum phosphate, calcium silicate, zirconium silicate, titanium silicate, montmorillonite, saponite, vermiculite, and hydrotalcite.

4 . The separator of claim 1 , wherein an average particle diameter (D50) of the ceramic particles is about 10 nm to about 30 μm.

5 . The separator of claim 1 , wherein based on 100 wt % of the ceramic layer, the ceramic particles are in an amount of about 50 wt % to about 99 wt %, and the binder is in an amount of about 1 wt % to about 50 wt %.

6 . The separator of claim 1 , wherein the inorganic particles of the functional layer comprise at least one selected from among lithium titanium oxide, lithium zirconium oxide, lithium aluminum oxide, lithium niobium oxide, lithium lanthanum oxide, lithium tantalum oxide, lithium zinc oxide, lithium titanium zirconium oxide, lithium lanthanum titanium oxide, lithium lanthanum zirconium oxide, lithium lanthanum titanium zirconium oxide, and lithium lanthanum zirconium aluminum oxide.

7 . The separator of claim 1 , wherein, in the functional layer, an average particle diameter (D50) of the inorganic particles is about 10 nm to about 30 μm.

8 . The separator of claim 1 , wherein, based on 100 wt % of the functional layer,
the inorganic particles are in an amount of about 50 wt % to about 99 wt %, and the binder is in an amount of about 1 wt % to about 50 wt %.

9 . The separator of claim 1 , wherein each of the binder of the ceramic layer and the binder of the functional layer each independently comprises at least one selected from among polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene, polyvinylidene fluoride-trichloroethylene, polyvinylidene fluoride-chlorotrifluoroethylene, polyvinyl alcohol, carboxylmethyl cellulose, hydroxypropyl cellulose, diacetyl cellulose, polyvinylchloride, carboxylated polyvinylchloride, polyvinylfluoride, an ethylene oxide-containing polymer, polyvinylpyrrolidone, polyurethane, polytetrafluoroethylene, polyethylene, polypropylene, a styrene-butadiene rubber, an acrylated styrene-butadiene rubber, an acrylonitrile-butadiene rubber, polyamideimide, and polyimide.

10 . The separator of claim 1 , wherein each of the binder of the ceramic layer and the binder of the functional layer comprises at least one selected from among polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene, polyvinylidene fluoride-trichloroethylene, and polyvinylidene fluoride-chlorotrifluoroethylene.

11 . A negative electrode-separator assembly for a rechargeable lithium battery, the negative electrode-separator assembly comprising;
a negative electrode, a functional layer on the negative electrode and comprising inorganic particles having a working potential (vs Li/Li + ) of greater than or equal to about 1 V and a binder, and a ceramic layer on the functional layer and comprising ceramic particles and a binder.

12 . The negative electrode-separator assembly of claim 11 , wherein
a thickness of the negative electrode is about 20 μm to about 200 μm, a thickness of the ceramic layer is about 1 μm to about 100 μm, and a thickness of the functional layer is about 1 μm to about 20 μm.

13 . The negative electrode-separator assembly of claim 11 , wherein the ceramic particles comprise at least one selected from among silicon oxide, aluminum oxide, boehmite, zinc oxide, zirconium oxide, zeolite, titanium oxide, barium titanate, strontium titanate, calcium titanate, aluminum borate, calcium carbonate, barium carbonate, lead oxide, cerium oxide, calcium oxide, magnesium oxide, niobium oxide, tantalum oxide, tungsten oxide, aluminum phosphate, calcium silicate, zirconium silicate, titanium silicate, montmorillonite, saponite, vermiculite, and hydrotalcite.

14 . The negative electrode-separator assembly of claim 11 , wherein the inorganic particles of the functional layer comprise at least one selected from among lithium titanium oxide, lithium zirconium oxide, lithium aluminum oxide, lithium niobium oxide, lithium lanthanum oxide, lithium tantalum oxide, lithium zinc oxide, lithium titanium zirconium oxide, lithium lanthanum titanium oxide, lithium lanthanum zirconium oxide, lithium lanthanum titanium zirconium oxide, and lithium lanthanum zirconium aluminum oxide.

15 . The negative electrode-separator assembly of claim 11 , wherein
an average particle diameter (D50) of the ceramic particles is about 10 nm to about 30 μm, and an average particle diameter (D50) of the inorganic particles of the functional layer is about 10 nm to about 30 μm.

16 . The negative electrode-separator assembly of claim 11 , wherein
the negative electrode comprises a current collector, and a negative electrode active material layer on the current collector, the negative electrode active material layer comprises a negative electrode active material, and the negative electrode active material comprises a carbon-based negative electrode active material.

17 . The negative electrode-separator assembly of claim 16 , wherein
the negative electrode active material further comprises a silicon-based negative electrode active material, and the silicon-based negative electrode active material comprises at least one selected from among silicon, silicon oxide, a silicon-carbon composite, and a silicon alloy.

18 . A rechargeable lithium battery, comprising:
the negative electrode-separator assembly of claim 11 , a positive electrode, and an electrolyte.

Assignees

• Samsung Sdi Co Ltd
• Univ Dankook Iacf

Inventors

• You Duckjae
• Koo Kyoseon
• Nam Junghyun
• Moon Jeunggi
• Song Hyo-Jung
• Yang Mihwa
• Yang Hosung
• Lee Jinhee
• Jang Jinyoung
• Lee Byoung-Sun
• Shin Hyeji
• Kim Heeyeon

Classifications

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/386

  Silicon or alloys based on silicon · CPC title

• H01M4/583

  Carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M10/0587

  of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators · CPC title