Positive electrode for lithium ion secondary battery and lithium ion secondary battery including the same

Patent metadata

Field	Value
Publication number	US-2016156021-A1
Application number	US-201514951624-A
Country	US
Kind code	A1
Filing date	Nov 25, 2015
Priority date	Nov 28, 2014
Publication date	Jun 2, 2016
Grant date	—

Abstract

A positive electrode for a lithium ion secondary battery, the positive electrode including a positive electrode particle including a positive active material particle, wherein the positive electrode particle comprises a first coating layer on a surface of the positive active material particle wherein the first coating layer includes a carbonaceous material, and a second coating layer on the first coating layer, wherein the second coating layer includes a lithium-containing compound, and a sulfide solid electrolyte contacting the positive electrode particle.

First claim

What is claimed is:

1 . A positive electrode for a lithium ion secondary battery, the positive electrode comprising:
a positive electrode particle comprising a positive active material particle, wherein the positive electrode particle comprises
a first coating layer on a surface of the positive active material particle wherein the first coating layer comprises a carbonaceous material, and
a second coating layer on the first coating layer, wherein the second coating layer comprises a lithium-containing compound; and
a sulfide solid electrolyte contacting the positive electrode particle contacting the positive electrode particle.

2 . The positive electrode of claim 1 , wherein the carbonaceous material comprises amorphous carbon.

3 . The positive electrode of claim 1 , wherein the carbonaceous material comprises carbon and further comprises a hydrocarbon represented by the formula C 4n+6 H 4n+12 , where n is a positive integer.

4 . The positive electrode of claim 1 , wherein the carbonaceous material comprises diamond-like-carbon.

5 . The positive electrode of claim 4 , wherein the diamond-like-carbon comprises hydrogen atoms in an amount in a range of about 1 atomic percent to about 50 atomic percent, based on a total content of the diamond-like-carbon.

6 . The positive electrode of claim 4 , wherein the diamond-like-carbon comprises carbon atoms having sp 2 hybrid bonds and carbon atoms having sp 3 hybrid bonds, and
wherein a content of the carbon atoms having sp 3 hybrid bonds in the diamond-like-carbon is in a range of about 10% to about 100%, based on a total carbon atom content of the diamond-like-carbon.

7 . The positive electrode of claim 1 , wherein a thickness of the first coating layer is in a range of about 1 nanometer to about 50 nanometers

8 . The positive electrode of claim 1 , wherein the lithium-containing compound comprises at least one selected from a lithium-containing oxide and a lithium-containing phosphorus oxide.

9 . The positive electrode of claim 8 , wherein the lithium-containing oxide is at least one selected from a lithium zirconium oxide, a lithium niobium oxide, a lithium titanium oxide, and a lithium aluminum oxide, and
wherein the lithium-containing phosphorus oxide is at least one selected from a lithium titanium phosphorus oxide and a lithium zirconium phosphorus oxide.

10 . The positive electrode of claim 8 , wherein the lithium-containing oxide comprises aLi 2 O—ZrO 2 , where 0.1≦a≦2.0.

11 . The positive electrode of claim 1 , wherein a sum of a thickness of the first coating layer and a thickness of the second coating layer is in a range of about 1 nanometer to about 500 nanometers

12 . The positive electrode of claim 1 , wherein the positive active material particle comprises a lithium salt of a transition metal oxide having a layered rock-salt type structure.

13 . The positive electrode of claim 12 , wherein the lithium salt of a transition metal oxide having a layered rock-salt type structure is of the formula LiNi x Co y M z O 2 , wherein M is Al or Mn, 0<x<1, 0<y<1, and x+y+z=1.

14 . The positive electrode of claim 1 , wherein the sulfide solid electrolyte comprises at least sulfur and lithium and further comprises at least one selected from phosphorus, silicon, boron, aluminum, germanium, zinc, gallium, indium, and a halogen element.

15 . The positive electrode of claim 1 , wherein the sulfide solid electrolyte comprises a lithium sulfide and at least one selected from a silicon sulfide, a phosphorus sulfide, and a boron sulfide.

16 . The positive electrode of claim 1 , wherein the sulfide solid electrolyte comprises Li 2 S and P 2 S 5 .

17 . The positive electrode of claim 1 , wherein the sulfide solid electrolyte is in a form of a particle.

18 . A lithium ion secondary battery comprising the positive electrode according to claim 1 .

Assignees

• Samsung Electronics Co Ltd

Inventors

• Aihara Yuichi
• Visbalmendoza Heidy Hodex
• Ito Seitaro

Classifications

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• H01M2004/028

  Positive electrodes · CPC title

• H01M4/131 Primary

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M10/0562

  Solid materials · CPC title