Coatings for cathode active materials

Patent metadata

Field	Value
Publication number	US-12206097-B2
Application number	US-202318348766-A
Country	US
Kind code	B2
Filing date	Jul 7, 2023
Priority date	Aug 17, 2018
Publication date	Jan 21, 2025
Grant date	Jan 21, 2025

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; and
a coating disposed over each of the plurality of cathode active compound particles, the coating comprising a lithium (Li) ion conducting oxide containing lithium (Li), lanthanum (La) and Germanium (Ge), wherein the conductivity of the conducting oxide is controlled by the ratio of La to Li.

2. The cathode active material of claim 1 , wherein each of the plurality of cathode active compound particles comprises the coating of less than 1% by weight.

3. The cathode active material of claim 1 , wherein the coating comprises a mixture of the lithium-ion conducting oxide containing La and Ge having a molar ratio of Li to Ge from 0.03 to 0.5 and a molar ratio of Li to La from 0.05 to 1.0 and an electrically conductive material.

4. The cathode active material of claim 1 , wherein the plurality of cathode active compound particles comprises lithium cobalt oxides or lithium transition-metal oxides.

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

6. The cathode active material of claim 5 , wherein 0.95≤α<0.99.

7. The cathode active material of claim 5 , 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.

8. The cathode active material of claim 1 , wherein the cathode active compound particles comprise 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.

9. The cathode active material of claim 8 , wherein 0.95≤α<0.99.

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

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

12. The battery cell of claim 11 , wherein the battery cell has an average voltage of at least 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

• H01M10/0525

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

• H01M4/628

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

• H01M2004/028

  Positive electrodes · 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

• Y02E60/10

  Energy storage using batteries · CPC title