Rechargeable battery cell with increased areal capacity

Patent metadata

Field	Value
Publication number	US-12261324-B2
Application number	US-202418604044-A
Country	US
Kind code	B2
Filing date	Mar 13, 2024
Priority date	Mar 14, 2023
Publication date	Mar 25, 2025
Grant date	Mar 25, 2025

Abstract

Rechargeable battery cells and methods for extreme fast charging are disclosed. For example, such a rechargeable battery cell might be chargeable to at least 70% of usable capacity within 15 minutes. Such a rechargeable battery cell may include an anode having at least one surface with a reversible areal capacity, after formation, up to 8.0 mAh/cm 2 , and a cathode having at least one surface with a reversible areal capacity, after formation, up to 6 mAh/cm 2 , wherein a ratio of areal capacity of the at least one surface of the anode to the at least one surface of the cathode is between 1.15 to 1.45. Methods of charging rechargeable battery cells disclosed herein under conditions sufficient to enable charging of at least 70% of usable capacity to the rechargeable battery cell within 15 minutes, are also disclosed.

First claim

What is claimed is:

1. A rechargeable battery cell, comprising:
an anode, cathode and separator configured to enable sequential charging and discharging, such that during sequential charging, at least 70% of usable capacity is loaded within 15 minutes, wherein:
the anode contains a silicon-carbon (Si/C) composite and at least one surface with a reversible areal capacity, after formation, up to 8.0 mAh/cm 2 ;
the cathode has at least one surface with a reversible areal capacity, after formation, up to 6 mAh/cm 2 ,
wherein a ratio of areal capacity of the at least one surface of the anode to the at least one surface of the cathode is between 1.15 to 1.45.

2. The rechargeable battery cell of claim 1 , wherein the anode has at least one surface with an areal capacity between 5 and 6 mAh/cm 2 and the cathode has at least one surface with an areal capacity between 4 and 5 mAh/cm 2 .

3. The rechargeable battery cell of claim 2 , wherein a ratio of areal capacity of the at least one surface of the anode to the at least one surface of the cathode is between 1.25 to 1.45.

4. The rechargeable battery cell of claim 1 , wherein the anode has at least one surface with a reversible areal capacity, after formation, between 6 and 8.0 mAh/cm 2 and the cathode has at least one surface with a reversible areal capacity, after formation, between 5 and 6 mAh/cm 2 .

5. The rechargeable battery cell of claim 4 , wherein a ratio of areal capacity of the at least one surface of the anode to the at least one surface of the cathode is between 1.15 to 1.35.

6. The rechargeable battery cell of claim 1 , wherein the anode containing a silicon-carbon (Si/C) composite contains at least 30% Si by weight.

7. The rechargeable battery cell of claim 1 , wherein the the anode containing a silicon-carbon (Si/C) composite further contains silicon oxide-carbon (SiOx/C, wherein 0<x<2), SiN/C and mixtures thereof.

8. The rechargeable battery cell of claim 1 , wherein the cathode includes a material selected from a group consisting of LNO (lithium nickel oxide), LMO (lithium manganese oxide), LNMO (lithium nickel manganese oxide), LFP (lithium ferro phosphate), NMC (nickel manganese cobalt), derivatives thereof, or combinations thereof.

9. The rechargeable battery cell of claim 8 , wherein the NMC includes NMC622 (60 atomic % nickel, 20 atomic % manganese, and 20 atomic % cobalt), NMC811 (80 atomic % nickel, 10 atomic % manganese, and 10 atomic % cobalt, or NMC9xx (90 atomic % nickel), derivatives thereof, or combination thereof.

10. The rechargeable battery cell of claim 1 , further comprising an electrolyte capable of carrying Li-ions between the anode and the cathode.

11. The rechargeable battery cell of claim 10 , wherein the electrolyte includes a lithium electrolyte salt and at least one additive for improving a lifetime of the battery.

12. The rechargeable battery cell of claim 11 , wherein the lithium electrolyte salt is selected from a group consisting of LiPF 6 , LiBF 4 lithium bis(oxalato) borate, LiN(CF 3 SO 2 ) 2 , LiN(C 2 F 5 SO 2 ) 2 , LiAsF 6 , LiC(CF 3 SO 2 ) 3 , LiClO 4 , and LiTFSI or combination thereof.

13. The rechargeable battery cell of claim 12 , further comprising at least one additive selected from the group consisting of ethylene carbonate (EC), dimethyl carbonate (DMC), diethyl carbonate (DEC), and ethyl methyl carbonate (EMC), vinyl carbonate (VC), and fluoroethylene carbonate (FEC).

14. The rechargeable battery cell of claim 13 , wherein the electrolyte includes at least two of EC, VC, DMC, and FEC.

15. The rechargeable battery cell of claim 1 , wherein the separator has a porosity above 40%.

16. The rechargeable battery cell of claim 15 , wherein the separator includes a polyolefin polymer.

17. The rechargeable battery cell of claim 16 , wherein the polyolefin polymer includes polyethylene or polypropylene.

18. The rechargeable battery cell of claim 1 , wherein during the sequential charging at least 70% of usable capacity is loaded within 10 minutes.

19. The rechargeable battery cell of claim 1 , wherein the anode containing a silicon-carbon (Si/C) composite is within a porous structure.

20. The rechargeable battery cell of claim 19 , wherein the porous structure has a porosity of at least 38%.

21. A method of charging a rechargeable battery cell, the method comprising:
providing a charging current to the rechargeable battery cell under conditions sufficient to enable charging of at least 70% of usable capacity to the rechargeable battery cell within 15 minutes,
wherein the rechargeable battery includes:
an anode containing a silicon-carbon (Si/C) composite and having at least one surface with a reversible areal capacity, after formation, up to 8.0 mAh/cm 2 ; and
a cathode having at least one surface with a reversible areal capacity, after formation, up to 6 mAh/cm 2 , wherein a ratio of areal capacity of the at least one surface of the anode to the at least one surface of the cathode is between 1.15 to 1.45.

22. The method of claim 21 , wherein the anode has at least one surface with a reversible areal capacity between 5 and 6 mAh/cm 2 and the cathode has at least one surface with a reversible areal capacity between 4 and 5 mAh/cm 2 .

23. The method of claim 22 , wherein a ratio of areal capacity of the at least one surface of the anode to the at least one surface of the cathode is between 1.25 to 1.45.

24. The method of claim 22 , wherein the anode has at least one surface with a reversible areal capacity, after formation, between 6 and 8.0 mAh/cm 2 and the cathode has at least one surface with a reversible areal capacity, after formation, between 5 and 6 mAh/cm 2 .

25. The method of claim 24 , wherein a ratio of areal capacity of the at least one surface of the anode to the at least one surface of the cathode is between 1.15 to 1.35.

26. The method of claim 21 , wherein the charging current enables charging of at least 70% of usable capacity to the rechargeable battery cell within 10 minutes.

27. The method of claim 21 , wherein the anode containing a silicon-carbon (Si/C) composite is within a porous structure.

28. The method of claim 27 , wherein the porous structure has a porosity of at least 38%.

Assignees

• Storedot Ltd

Inventors

• Aronov Daniel
• Kedem Nir
• Idesis Yaron
• Corfas Dan
• Zehavi Assaf
• Ioffe Zvi

Classifications

• H01M2300/0051

  Carbonates · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title

• H01M10/441

  for several batteries or cells simultaneously or sequentially · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• H01M4/136

  Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy · CPC title