High voltage electrolyte additives

Patent metadata

Field	Value
Publication number	US-11322778-B2
Application number	US-201815991899-A
Country	US
Kind code	B2
Filing date	May 29, 2018
Priority date	May 29, 2018
Publication date	May 3, 2022
Grant date	May 3, 2022

Abstract

Described herein are additives for use in electrolytes that provide a number of desirable characteristics when implemented within batteries, such as high capacity retention during battery cycling at high temperatures. In some embodiments, a high voltage electrolyte includes a base electrolyte and one or more vinylsilane or fluorosilane additives, which impart these desirable performance characteristics.

First claim

What is claimed is:

1. A lithium ion battery, comprising:
an anode;
a cathode represented by the formula LiNi a Mn b Co c O d , wherein 0.5≤a<1, 0<b<0.5, 0<c<0.5, a+b+c=1, and 0<d≤2; and
a liquid electrolyte comprising a lithium salt, a solvent, and an additive, wherein the additive is tetravinylsilane, represented by Formula (A), and a concentration of the tetravinylsilane is at least 1 weight percent of a total weight of the liquid electrolyte:

wherein tetravinylsilane is the only additive present in the liquid electrolyte, and the liquid electrolyte is free of fluorinated carbonates.

2. The lithium ion battery of claim 1 , wherein the cathode is represented by the formula LiNi 0.6 Mn 0.2 Co 0.2 O 2 .

3. The lithium ion battery of claim 1 , wherein the cathode is represented by the formula LiNi 0.8 Mn 0.1 Co 0.1 O 2 .

4. The lithium ion battery of claim 1 , wherein the cathode is represented by the formula LiNi 0.5 Mn 0.3 Co 0.2 O 2 .

5. The lithium ion battery of claim 1 , wherein a rated charge voltage of the battery is greater than 4.4 V.

6. The lithium ion battery of claim 1 , wherein a concentration of the tetravinylsilane is less than 2 weight percent of a total weight of the liquid electrolyte.

7. The lithium ion battery of claim 1 , wherein the concentration of the tetravinylsilane is at least 2 weight percent of the total weight of the liquid electrolyte.

8. A lithium ion battery, comprising:
an anode;
a cathode represented by the formula LiNi a Mn b Co c O d , wherein 0.5≤a<1, 0<b<0.5, 0<c<0.5, a+b+c=1, and 0<d≤2; and
a liquid electrolyte comprising a lithium salt, a solvent, and an additive, wherein the additive is tetraallylsilane, represented by Formula (B), and a concentration of the tetraallylsilane is at least 1 weight percent of a total weight of the liquid electrolyte:

wherein tetraallylsilane is the only additive present in the liquid electrolyte, and the liquid electrolyte is free of fluorinated carbonates.

9. The lithium ion battery of claim 8 , wherein the cathode is represented by one of the formula LiNi 0.5 Mn 0.3 Co 0.2 O 2 , the formula LiNi 0.6 Mn 0.2 Co 0.2 O 2 , or the formula LiNi 0.8 Mn 0.1 Co 0.1 O 2 .

10. The lithium ion battery of claim 8 , wherein the concentration of the tetraallylsilane is at least 2 weight percent of the total weight of the liquid electrolyte.

11. A lithium ion battery, comprising:
an anode;
a cathode represented by the formula LiNi a Co b Al c O 2 , wherein 0.5≤a<1, 0<b<0.5, 0<c<0.5, and a+b+c=1; and
a liquid electrolyte comprising a lithium salt, a solvent, and an additive, wherein the additive is tetravinylsilane, represented by Formula (A), and a concentration of the tetravinylsilane is at least 1 weight percent of a total weight of the liquid electrolyte:

wherein tetravinylsilane is the only additive present in the liquid electrolyte, and the liquid electrolyte is free of fluorinated carbonates.

12. The lithium ion battery of claim 11 , wherein the cathode is represented by the formula LiNi 0.8 Co 0.15 Al 0.05 O 2 .

13. The lithium ion battery of claim 11 , wherein a rated charge voltage of the battery is greater than 4.4 V.

14. The lithium ion battery of claim 11 , wherein the concentration of the tetravinylsilane is at least 2 weight percent of the total weight of the liquid electrolyte.

Assignees

• Wildcat discovery technologies inc

Inventors

• Cheng Gang
• Huang Jinhua
• Zhu Ye

Classifications

• H01M10/0567 Primary

  characterised by the additives · CPC title

• H01M2300/0025

  Organic electrolyte · CPC title

• H01M10/4235

  Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence) · 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

• H01M2300/0017

  Non-aqueous electrolytes · CPC title