Additives for electrochemical cells

Patent metadata

Field	Value
Publication number	US-12074289-B2
Application number	US-202218086542-A
Country	US
Kind code	B2
Filing date	Dec 21, 2022
Priority date	Nov 13, 2015
Publication date	Aug 27, 2024
Grant date	Aug 27, 2024

Abstract

Articles and methods including additives in electrochemical cells, are generally provided. As described herein, such electrochemical cells may comprise an anode, a cathode, an electrolyte, and optionally a separator. In some embodiments, at least one of the anode, the cathode, the electrolyte, and/or the optional separator may comprise an additive and/or additive precursor. For instance, in some cases, the electrochemical cell comprises an electrolyte and an additive and/or additive precursor that is soluble with and/or is present in the electrolyte. In some embodiments, the additive precursor comprises a disulfide bond. In certain embodiments, the additive is a carbon disulfide salt. In some cases, the electrolyte may comprise a nitrate.

First claim

What is claimed is:

1. An electrochemical cell, comprising:
a first electrode, wherein the first electrode comprises an alkali metal;
a protective layer comprising a ceramic and/or a glass disposed on the first electrode;
a second electrode;
a separator; and
an electrolyte, wherein:
the electrolyte comprises a fluorinated ether,
the electrolyte comprises an unfluorinated carbonate; and
the electrolyte comprises a fluorinated carbonate.

2. An electrochemical cell as in claim 1 , wherein the alkali metal is lithium metal.

3. An electrochemical cell as in claim 1 , wherein the second electrode is a lithium-intercalation cathode.

4. An electrochemical cell as in claim 3 , wherein the lithium-intercalation cathode comprises Li x CoO 2 , Li x NiO 2 , Li x MnO 2 , Li x Mn 2 O 4 , Li x FePO 4 , Li x CoPO 4 , Li x MnPO 4 , and Li x NiPO 4 , where (0<x≤1), and/or LiNi x Mn y Co z O 2 where (x+y+z=1).

5. An electrochemical cell as in claim 1 , wherein the electrolyte comprises LiPF 6 .

6. An electrochemical cell as in claim 1 , wherein the electrolyte comprises LiBF 4 .

7. An electrochemical cell as in claim 1 , wherein the electrolyte comprises a sulfonimide salt.

8. An electrochemical cell as in claim 7 , wherein the sulfonimide salt is lithium bis(trifluoromethane) sulfonimide.

9. An electrochemical cell as in claim 1 , wherein the unfluorinated carbonate is a linear unfluorinated carbonate.

10. An electrochemical cell as in claim 9 , wherein the unfluorinated linear carbonate is dimethyl carbonate.

11. An electrochemical cell as in claim 1 , wherein the fluorinated carbonate is a cyclic fluorinated carbonate.

12. An electrochemical cell as in claim 11 , wherein the cyclic fluorinated carbonate is fluoroethylene carbonate.

13. An electrochemical cell as in claim 1 , wherein the fluorinated ether is a linear fluorinated ether.

14. An electrochemical cell as in claim 13 , wherein the linear fluorinated ether is a fluorinated diethyl ether.

15. An electrochemical cell as in claim 1 , wherein the protective layer is an ion-conductive layer that is non-polymeric.

16. An electrochemical cell as in claim 7 , wherein the sulfonimide salt is LiN(SO 2 F) 2 .

Assignees

• Sion Power Corp

Inventors

• Mikhaylik Yuriy V
• Kovalev Igor P
• Weiss Thomas

Classifications

• H01M10/058

  Construction or manufacture · CPC title

• H01M2300/0025

  Organic electrolyte · CPC title

• H01M10/0568

  characterised by the solutes · CPC title

• H01M10/052

  Li-accumulators · CPC title

• H01M4/38

  of elements or alloys · CPC title