Over-lithiated cathode material

Patent metadata

Field	Value
Publication number	US-11637285-B2
Application number	US-202017062358-A
Country	US
Kind code	B2
Filing date	Oct 2, 2020
Priority date	Oct 2, 2020
Publication date	Apr 25, 2023
Grant date	Apr 25, 2023

Abstract

The present disclosure relates to over-lithiated positive electroactive materials for use within an electrochemical cell. For example, the electrochemical cell includes a positive electrode that includes an over-lithiated positive electroactive material that includes one of LixMn2O4 (where 1.05≤x≤1.30) and LiMn(2−x)NixO4 (where 0≤x≤0.5). The electrochemical cell can include a negative electrode that includes a silicon-containing negative electroactive material having a Columbic Efficiency greater than or equal to about 80% and less than or equal to about 90%.

First claim

What is claimed is:

1. An electrochemical cell that cycles lithium ions, wherein the electrochemical cell comprises:
a positive electrode comprising an over-lithiated positive electroactive material comprising Li x Mn 2 O 4 (where 1.20≤x≤1.30) and having a Columbic Efficiency greater than or equal to about 80% to less than or equal to about 82%;
a negative electrode comprising a silicon-containing negative electroactive material comprising one of blended silicon-graphite and blended silicon oxide-graphite and having a Columbic Efficiency greater than or equal to about 80% to less than or equal to about 90%; and
an electrolyte disposed between the negative electrode and the positive electrode.

2. The electrochemical cell of claim 1 , wherein the over-lithiated positive electroactive material further comprises Li x Mn 2 O 4 , where 1.05≤x≤1.20.

3. The electrochemical cell of claim 1 , wherein theoretical charge capacity is defined by:

26.8
x

173.9
+

6.9
x

.

4. An electrochemical cell that cycles lithium ions, wherein the electrochemical cell comprises:
a positive electrode comprising an over-lithiated positive electroactive material comprising one of Li x Mn 2 O 4 (where 1.20≤x≤1.30) and having a Columbic Efficiency greater than or equal to about 80% to less than or equal to about 82%;
a negative electrode comprising a silicon-containing electroactive material comprising one of blended silicon-graphite and blended silicon oxide-graphite; and
an electrolyte disposed between the negative electrode and the positive electrode.

5. The electrochemical cell of claim 4 , wherein the over-lithiated positive electroactive material further comprises Li x Mn 2 O 4 , where 1.05≤x≤1.20.

6. An electrochemical cell that cycles lithium ions, wherein the electrochemical cell comprises:
a positive electrode comprising an over-lithiated positive electroactive material comprising Li x Mn 2 O 4 , where 1.20≤x≤1.30 and having a first Columbic efficiency greater than or equal to about 80% to less than or equal to about 82%;
a negative electrode comprising a silicon-containing electroactive material comprising one of a blended silicon-graphite and a blended silicon-oxide graphite and having a second Columbic Efficiency, wherein the first and second Columbic Efficiencies are the same; and
an electrolyte disposed between the negative electrode and the positive electrode.

7. The electrochemical cell of claim 6 , wherein the over-lithiated positive electroactive material further comprises Li x Mn 2 O 4 , where 1.05≤x≤1.30.

8. The electrochemical cell of claim 6 , wherein the over-lithiated positive electroactive material further comprises Li x Mn 2 O 4 , where 1.05≤x≤1.20.

9. The electrochemical cell of claim 6 , where the over-lithiated positive electroactive material further comprises LiMn (2−x) Ni x O 4 (where 0≤x≤0.5).

10. The electrochemical cell of claim 1 , wherein the over-lithiated positive electroactive material further comprises LiMn (2−x) Ni x O 4 , where 0≤x≤0.5.

11. The electrochemical cell of claim 4 , wherein the over-lithiated positive electroactive material further comprises LiMn (2−x) Ni x O 4 , where 0≤x≤0.5.

Assignees

• Gm Global Tech Operations Llc

Inventors

• Fortier Mary E
• Tan Bing
• Yang Li
• Viswanathan Umamaheswari
• Saharan Vijay P
• Zeng Sherman H

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• 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

• H01M4/505 Primary

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/386

  Silicon or alloys based on silicon · CPC title