Positive electrode active material, methods for the manufacture thereof, and electrochemical cell comprising the positive electrode active material

Patent metadata

Field	Value
Publication number	US-10930927-B2
Application number	US-201815970144-A
Country	US
Kind code	B2
Filing date	May 3, 2018
Priority date	Nov 8, 2017
Publication date	Feb 23, 2021
Grant date	Feb 23, 2021

Abstract

A positive electrode active material includes a core and a coating disposed on at least a portion of a surface of the core. The core includes a lithium metal oxide, a lithium metal phosphate, or a combination thereof. The coating includes a compound according to the formula LimM1nXp, wherein M1, X, m, n and p are as defined herein. Also, an electrochemical cell including the positive electrode active material, and methods for the manufacture of the positive electrode active material and the electrochemical cell.

First claim

What is claimed is:

1. A positive electrode active material comprising
a core comprising a lithium metal oxide, a lithium metal phosphate, or a combination thereof, and
a coating disposed directly on at least a portion of a surface of the core, wherein the coating comprises
a compound according to Formula (I)
Li m Zn n (PO 4 ) p   (I);

Li 3 B 11 O 18 ;

or a combination thereof;

wherein
0<m≤6, 0<n≤1, and 0<p≤7;

wherein the coating has a thickness of 1 to 100 nanometers; and
wherein a cell comprising the positive electrode active material has an interfacial resistance that is less than an interfacial resistance of a cell comprising the same positive electrode active material without the coating.

2. The positive electrode active material of claim 1 , wherein the core comprises LiFePO 4 , LiNiMnO 2 , Li(Ni 1/3 Mn 1/3 Co 1/3 )O 2 , or a combination thereof.

3. The positive electrode active material of claim 1 , wherein the coating has
a lithium ion conductivity of 10 −8 to 10 0 S/cm at 25° C.

4. The positive electrode active material of claim 1 , wherein the coating has a thickness of 1 to 50 nanometers.

5. The positive electrode active material of claim 1 , wherein the coating comprises LiZnPO 4 .

6. The positive electrode active material of claim 1 , wherein the coating comprises Li 3 B 11 O 18 .

7. A method for the manufacture of an electrochemical cell, the method comprising:
providing a positive electrode comprising the positive electrode active material of claim 1 ,
providing a negative electrode, and
disposing an electrolyte between the positive electrode and the negative electrode to manufacture the electrochemical cell;
wherein the electrochemical cell has an interfacial resistance that is less than an interfacial resistance of an electrochemical cell comprising the same positive electrode active material without the coating.

8. An electrochemical cell comprising
a positive electrode comprising a positive electrode active material comprising
a core comprising a lithium metal oxide, a lithium metal phosphate, or a combination thereof, and
a coating disposed on at least a portion of a surface of the core, wherein the coating comprises
a compound according to Formula (I)
Li m Zn n (PO 4 ) p   (I);

Li 3 B 11 O 18 ;

or a combination thereof;

wherein
0<m≤6, 0<n≤1, and 0<p≤7;
wherein the coating has a thickness of 1 to 100 nanometers;

a negative electrode; and
an electrolyte between the positive electrode and the negative electrode;
wherein the electrochemical cell has an interfacial resistance that is less than an interfacial resistance of an electrochemical cell comprising the same positive electrode active material without the coating.

9. The electrochemical cell of claim 8 , further comprising a separator disposed between the positive electrode and the negative electrode.

10. The electrochemical cell of claim 8 , wherein the negative electrode comprises graphite.

11. The electrochemical cell of claim 8 , wherein the negative electrode comprises lithium metal.

12. The electrochemical cell of claim 8 , wherein the electrolyte is a solid electrolyte.

13. The electrochemical cell of claim 12 , wherein the solid electrolyte is a sulfide solid electrolyte.

14. The electrochemical cell of claim 13 , wherein the sulfide solid electrolyte comprises Li 2 S and P 2 S 5 .

Assignees

• Samsung Electronics Co Ltd
• Univ California
• Massachusetts Inst Technology

Inventors

• Miara Lincoln
• Wang Yan
• Tsujimura Tomoyuki
• Aihara Yuichi
• Richards William
• Ceder Gerbrand

Classifications

• C01P2004/82

  two phases having the same anion, e.g. both oxidic phases · CPC title

• H01M4/525

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

• H01M4/62

  Selection of inactive substances as ingredients for active masses, e.g. binders, fillers · CPC title

• C01P2006/40

  Electric properties · CPC title

• H01M4/131

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