ELECTRODE AND LITHIUM SECONDARY BATTERY COMPRISING SAME

• US 20200136127A1
• Filed: 06/27/2018
• Published: 04/30/2020
• Est. Priority Date: 07/04/2017
• Status: Active Grant

• Current Assignee: LG Energy Solution Limited (LG Corporation)
• Original Assignee: LG Chem Limited (LG Corporation)
• Inventors: CHO, Eunkyung, KIM, Yun Kyoung, SOHN, Kwonnam, YANG, Doo Kyung
• Granted Patent: US 11,424,441 B2
• Time in Patent Office: Days
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 2004/021 Physical characteristics, e.g. porosity, surface area
• CPC Class Codes: H01M 2004/028 Positive electrodes
• CPC Class Codes: H01M 4/134 Electrodes based on metals, Si or alloys
• CPC Class Codes: H01M 4/136 Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
• CPC Class Codes: H01M 4/364 as mixtures
• CPC Class Codes: H01M 4/38 of elements or alloys
• CPC Class Codes: H01M 4/5815 Sulfides
• CPC Class Codes: H01M 4/622 being polymers
• CPC Class Codes: H01M 4/623 fluorinated polymers
• CPC Class Codes: H01M 4/624 Electric conductive fillers
• CPC Class Codes: H01M 4/625 Carbon or graphite
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

An electrode including an additive for forming pores with an average particle diameter of 1 μm or greater, and a lithium secondary battery including the electrode. The porosity of the porous particles may be from 50% to 95%. The porosity of the electrode increases by including the additive for forming pores. As the porosity of the electrode increases by the additive for forming pores, and accordingly, effects of having excellent electrode reactivity and enhanced initial capacity are obtained even under high loading.

Claims

1. An electrode, comprising:

an additive for forming pores, wherein the additive comprises porous particles having an average particle diameter (D50) of 1 μ

m or greater.

2. The electrode of claim 1, wherein a porosity of the porous particles is from 50% to 95%.

3. The electrode of claim 1, wherein the additive for forming pores comprises carbon or graphite.

4. The electrode of claim 1, wherein a content of the additive for forming pores is from 0.5% by weight to 5% by weight with respect to a total weight of the electrode.

5. The electrode of claim 1, wherein the electrode has a porosity of 64% or greater.

6. The electrode of claim 1, further comprising:

an electrode active material;

a binder; and

a conductor.

7. The electrode of claim 6, wherein the electrode active material is one or more positive electrode active materials selected from the group consisting of elemental sulfur (S8), a sulfur series compound and a mixture thereof.

8. The electrode of claim 6, wherein the binder is one or more selected from the group consisting of styrene-butadiene rubber-carboxymethyl cellulose (SBR-CMC), poly(vinyl acetate), polyvinyl alcohol, polyethylene oxide, polyvinyl pyrrolidone, alkylated polyethylene oxide, crosslinked polyethylene oxide, polyvinyl ether, poly(methyl methacrylate), polyvinylidene fluoride, a copolymer of polyhexafluoropropylene and polyvinylidene fluoride, poly(ethyl acrylate), polytetrafluoroethylene, polyvinyl chloride, polyacrylonitrile, polyvinylpyridine, polystyrene, derivatives thereof, blends thereof and copolymers thereof.

9. The electrode of claim 6, wherein the conductor is one or more selected from the group consisting of carbon-based materials selected from carbon black, acetylene black and ketjen black;

and conducting polymers selected from polyaniline, polythiophene, polyacetylene and polypyrrole.

10. A lithium secondary battery comprising the electrode of claim 1.

11. The lithium secondary battery of claim 10, wherein the electrode is a positive electrode.

12. The lithium secondary battery of claim 10, wherein the lithium secondary battery is a lithium-sulfur battery.

13. An electrode, comprising:

a pore forming agent selected from the group consisting of a monomer of a depolymerization reactive polymer, a plasticizer, an organic mold and a mixture thereof.