Positive electrode active material for lithium secondary battery, method of manufacturing the same, and lithium secondary battery including the material

Patent metadata

Field	Value
Publication number	US-9231273-B2
Application number	US-201213818549-A
Country	US
Kind code	B2
Filing date	Dec 27, 2012
Priority date	Dec 30, 2011
Publication date	Jan 5, 2016
Grant date	Jan 5, 2016

Abstract

Provided is a positive electrode active material for a lithium secondary battery including a positive electrode active material particle and an electrolyte-containing metal oxide coating layer having a porous structure and a method of manufacturing the same. A lithium secondary battery to which the positive electrode active material including the electrolyte-containing metal oxide coating layer is applied can have improved charge/discharge efficiency and lifespan characteristics at the same time.

First claim

The invention claimed is:

1. A positive electrode active material for a lithium secondary battery, the material comprising:
a positive electrode active material particle; and
an electrolyte-containing metal oxide coating layer having a porous structure and formed on the surface of the positive electrode active material particle,
wherein an electrolyte of the electrolyte-containing metal oxide coating layer comprises an ionic liquid selected from a group consisting of an imidazolium-based material, a pyrrolidinium-based material, a tetraalkylammonium-based material, a piperidinium-based material, a pyridinium-based material, and a sulfonium-based material.

2. The material according to claim 1 , wherein the positive electrode active material is at least one selected from a group consisting of:
Li x MPO 4 wherein M is selected from a group consisting of iron (Fe), manganese (Mn), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), magnesium (Mg), chromium (Cr), vanadium (V), molybdenum (Mo), titanium (Ti), aluminum (Al), niobium (Nb), and gallium (Ga), and 0.05≦x≦1.2;
LiMO 2 wherein M is at least one selected from a group consisting of transition metal elements;
LiNi x Co y Mn z O 2 wherein x+y+z=1;
xLiMO 2 (1−x)Li 2 M′O 3 wherein 0<x<1, M includes at least one metal element having an average oxidation number of +3 and includes at least one Ni element, and M′ includes at least one metal element having an average oxidation number of +4; and
LiM 2 O 4 wherein M is at least one selected from a group consisting of transition metal elements.

3. The material according to claim 1 , wherein the electrolyte-containing metal oxide coating layer comprises a metal oxide selected from a group consisting of Al 2 O 3 , SiO 2 , ZrO 2 , TiO 2 , CoO, Fe 2 O 3 , CaO, and SnO 2 .

4. The material according to claim 1 , wherein the porous structure of the electrolyte-containing metal oxide coating layer has open pores with a size of about 1 nm to about 100 nm.

5. The material according to claim 1 , wherein the metal oxide of the electrolyte-containing metal oxide coating layer is nanoscale.

6. A method of preparing a positive electrode active material for a lithium secondary battery, the method comprising:
forming an electrolyte-containing metal oxide by reacting an ionic electrolyte with a metal oxide having a porous structure; and
coating a positive electrode active material with the electrolyte-containing metal oxide, wherein an electrolyte of the electrolyte-containing metal oxide coating layer comprises an ionic liquid selected from a group consisting of an imidazolium-based material, a pyrrolidinium-based material, a tetraalkylammonium-based material, a piperidinium-based material, a pyridinium-based material, and a sulfonium-based material.

7. The method according to claim 6 , wherein the forming of the electrolyte-containing metal oxide comprises putting an ionic electrolyte into the metal oxide while forming the metal oxide to have the porous structure.

8. The method according to claim 6 , wherein the forming of the electrolyte-containing metal oxide comprises putting an ionic electrolyte into the metal oxide after forming the metal oxide to have the porous structure.

9. The method according to claim 6 , wherein the coating of the positive electrode active material comprises blending the electrolyte-containing metal oxide with the positive electrode active material to form a mixture and solidifying the mixture.

10. A lithium secondary battery comprising the positive electrode active material according to claim 1 .

Assignees

• Samsung Sdi Co Ltd

Inventors

• Lee Hyun Cheol
• Yang Woo Young

Classifications

• Y02E60/122

  Cross-Sectional Technologies · mapped topic

• H01M4/525 Primary

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M4/366

  as layered products · CPC title

• H01M10/056 Primary

  characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes · CPC title

• H01M10/052

  Li-accumulators · CPC title