Electrode and lithium secondary battery comprising same

Patent metadata

Field	Value
Publication number	US-2019229342-A1
Application number	US-201916368149-A
Country	US
Kind code	A1
Filing date	Mar 28, 2019
Priority date	Mar 16, 2017
Publication date	Jul 25, 2019
Grant date	—

Abstract

An electrode and a lithium secondary battery including the same. By preparing an electrode including an electrode active layer formed using a structure capable of supporting an electrode active material, safety and charge and discharge properties of a battery are improved due to morphological characteristics of the electrode active material being supported inside the structure.

First claim

1 . An electrode comprising:
a current collector; and an electrode active layer comprising a structure suitable for supporting an electrode active material, formed on the current collector.

2 . The electrode of claim 1 , wherein the current collector is one or more types selected from the group consisting of copper, stainless steel, aluminum, nickel, titanium and baked carbon.

3 . The electrode of claim 1 , wherein the electrode active layer further comprises a binder and a conductor.

4 . The electrode of claim 3 , wherein the electrode active layer comprises the structure in 80% by weight to 99.5% by weight, the binder in 0.3% by weight to 19.8% by weight and the conductor in 0.2% by weight to 19.7% by weight based upon the total weight of the electrode active layer.

5 . The electrode of claim 3 , wherein the binder is one or more types of aqueous binders selected from the group consisting of acrylate-based rubber and styrene-based rubber.

6 . The electrode of claim 3 , wherein the conductor is one or more types selected from the group consisting of carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, thermal black and carbon fiber.

7 . The electrode of claim 1 , wherein the structure has a core-shell shape.

8 . The electrode of claim 1 , wherein the structure having a core-shell shape is a spherical or tube-shaped structure.

9 . The electrode of claim 8 , wherein structure is the tube-shaped structure and comprises a tube having an inner surface forming a cavity and two ends, wherein one or both ends are open.

10 . The electrode of claim 1 , wherein the structure comprises a tube an inner surface forming a cavity and two ends, wherein one or both ends are open; and a metal comprised on the inner surface of the tube.

11 . The electrode of claim 10 , wherein the tube has a longitudinal section aspect ratio (a) of greater than 1 by the following Equation 1:
a=L/D ex   [Equation 1]
in Equation 1, L is a length of the tube and D ex is an outer diameter of the tube.

12 . The electrode of claim 10 , wherein the tube comprises carbon.

13 . The electrode of claim 10 , wherein the carbon is porous.

14 . The electrode of claim 10 , wherein the metal is comprised in 0.1% by weight to 25% by weight with respect to a total weight of the structure.

15 . The electrode of claim 10 , wherein the metal is present as a particle that has a particle diameter of 1 nm to 50 nm.

16 . The electrode of claim 10 , wherein the metal is a metal having a lower overvoltage with an electrode active material compared to an electrode current collector; or a metal having a multiphase with an electrode active material.

17 . The electrode of claim 10 , wherein the metal is one or more types selected from the group consisting of Au, Zn, Mg, Ag, Al, Pt, In, Co, Ni, Mn, Si and Ca.

18 . The electrode of claim 1 , wherein the electrode active material is lithium metal as a negative electrode active material.

19 . The electrode of claim 10 , wherein a volume ratio (a) of the lithium metal with respect to a free volume of the tube is 0≤α≤1 by the following Equation 2:
α= V Li /V F   [Equation 2]

in Equation 2, V F is a free volume of the tube and V Li is a volume of the lithium metal, and the V F is calculated by the following Equation 3:
V F =Π(D in /2) 2 L   [Equation 3]

in Equation 3, D in is an inner diameter of the tube and L is a length of the tube.

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

Assignees

• Lg Chemical Ltd
• Korea Advanced Inst Sci & Tech

Inventors

• Son Byoungkuk
• Choi Jang Wook
• Kim Byung Gon
• Jang Minchul
• Park Eunkyung
• Choi Junghun
• Kang Donghyeon

Classifications

• H01M4/366 Primary

  as layered products · CPC title

• H01M4/661

  Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence) · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/663

  containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres · CPC title

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title