Coatings for cathode active materials

Patent metadata

Field	Value
Publication number	US-11749799-B2
Application number	US-201916531883-A
Country	US
Kind code	B2
Filing date	Aug 5, 2019
Priority date	Aug 17, 2018
Publication date	Sep 5, 2023
Grant date	Sep 5, 2023

Abstract

A cathode active material includes a plurality of cathode active compound particles and a coating disposed over each of the cathode active compound particles. The coating includes a lithium (Li)-ion conducting oxide containing lanthanum (La) and titanium (Ti).

First claim

We claim:

1. A cathode active material comprising:
a plurality of cathode active compound particles comprising a compound of Formula (X):
Li α Co 1·x·y M y Mn x O δ   (X)

wherein
M is selected from La, Ge, B, Na, Mg, Ti, Ca, V, Cr, Fe, Co, Ni, Cu, Zn, Al, Sc, Y, Ga Zr, Ru and Mo;
0.95≤α≤1.05;
0<x≤0.30;
0≤y≤0.10; and
1.98<δ<2.04; and
a coating disposed over the entirety of each of the cathode active compound particles;
the coating comprising a lithium (Li)-ion conducting oxide comprising lanthanum (La) and titanium (Ti).

2. The cathode active material of claim 1 , wherein the coating comprises a Perovskite La 2/3·x Li 3x TiO 3 , where 0≤x≤2/3.

3. The cathode active material of claim 1 , wherein the coating is less than 1% of the particles by weight.

4. The cathode active material of claim 1 , wherein the coating comprises a blend of the lithium-ion conducting oxide containing La and Ti having a molar ratio of Li to Ti from 0.03 to 0.5 and a molar ratio of Li to La from 0.05 to 1 and an electrically conductive material.

5. The cathode active material of claim 1 , wherein the cathode active material comprises lithium cobalt oxides or lithium transition-metal oxides.

6. The cathode active material of claim 1 , wherein the cathode active compound particles comprise a compound of Formula (IXb)
(v) [Li 2 M 7 O 3 ]·(1-v) [Li a Co 1−δ M 8 σ O 2 ]  (IXb)

wherein
M 7 is selected from Mn, Ti, Zr, and Ru;
M 8 is selected from La, Ge, B, Na, Mg, Ti, Ca, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Al, Sc, Y, Ga, Zr, Ru, and Mo;
0.95≤α≤1.05;
0.01<v<0.10; and
0<σ≤0.05.

7. The cathode active material of claim 6 , wherein 0.95≤a<0.99.

8. The cathode active material of claim 6 , wherein M 8 is selected from Na, Mg, Ti, Ca, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Al, Sc, Y, Ga, Zr, Ru, and Mo.

9. The cathode active material of claim 1 , wherein 0.95≤a≤0.99.

10. A cathode comprising the coated cathode active material of claim 1 .

11. A battery cell, comprising:
an anode comprising an anode current collector, the cathode comprising the coated cathode active material of claim 1 ; and
a separator disposed between the anode and the cathode.

12. The battery cell of claim 11 , having an average voltage of greater than 4.0 V after 5 cycles of charge and discharge.

Assignees

• Apple Inc

Inventors

• Wu Huiming
• Dai Hongli
• Wang Dapeng
• Iddir Hakim H
• Vu Anh
• Carter John David
• Wang Xiaoping
• Li Yan
• Yang Zhenzhen
• Cui Yanjie
• Gilbert James
• Johnson Christopher S
• Kropf Arthur Jeremy

Classifications

• H01M4/366 Primary

  as layered products · 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

• H01M4/628

  Inhibitors, e.g. gassing inhibitors, corrosion inhibitors · CPC title

• H01M10/0525

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

• H01M2004/028

  Positive electrodes · CPC title