Positive electrode enabling fast charging

Patent metadata

Field	Value
Publication number	US-11909042-B2
Application number	US-202017118148-A
Country	US
Kind code	B2
Filing date	Dec 10, 2020
Priority date	Dec 10, 2020
Publication date	Feb 20, 2024
Grant date	Feb 20, 2024

Abstract

A rechargeable lithium-ion battery includes a positive electrode enabling fast charging. A negative electrode has a first active material including Li 4 Ti 5 O 12 . A positive electrode includes a second active material including LiCoO 2 . The positive electrode further includes a carbon conductive agent and a binder. A weight ratio of the carbon conductive agent to the binder is in a range of about 2:3 to about 3:2.

First claim

What is claimed is:

1. A rechargeable lithium-ion battery comprising:
a negative electrode comprising a first active material comprising Li 4 Ti 5 O 12 ;
a positive electrode comprising:
a second active material comprising LiCoO 2 , wherein a content of the LiCoO 2 is in a range of about 96% to about 98% of a weight of the positive electrode;
a carbon conductive agent; and
a binder, wherein a weight ratio of the carbon conductive agent to the binder is characterized by the positive electrode having a volumetric capacity in a range of about 550 mAh/cc to about 570 mAh/cc.

2. The rechargeable lithium-ion battery of claim 1 , wherein the carbon conductive agent is a mixture of carbon black and graphite.

3. The rechargeable lithium-ion battery of claim 2 , wherein a weight ratio of carbon black to graphite is in a range of about 1:9 to about 9:1.

4. The rechargeable lithium-ion battery of claim 2 , wherein a weight ratio of carbon black to graphite is in a range of about 3:7 to about 7:3.

5. The rechargeable lithium-ion battery of claim 1 , wherein a weight ratio of the carbon conductive agent to the binder is in a range of about 1:1 to about 3:2.

6. The rechargeable lithium-ion battery of claim 1 , wherein the binder comprises PVDF.

7. The rechargeable lithium-ion battery of claim 1 , wherein the weight ratio of the carbon conductive agent to the binder is further characterized by the positive electrode having a dry resistance in a range of about 1 Ohm to about 10 Ohms.

8. The rechargeable lithium-ion battery of claim 1 , wherein the rechargeable lithium-ion battery can be charged to at least 90% state of charge in a range of about 5 minutes to about 15 minutes.

9. A rechargeable lithium-ion battery comprising:
a negative electrode comprising a first active material comprising Li 4 Ti 5 O 12 ; and
a positive electrode comprising:
a second active material comprising LiCoO 2 , wherein a content of the LiCoO 2 is in a range of about 96% to about 98% of a weight of the positive electrode;
a carbon conductive agent comprising a weight ratio of carbon black and graphite in a range of about 1:9 to about 9:1; and
a binder, wherein a weight ratio of the carbon conductive agent to the binder is characterized by the positive electrode having a dry resistance in a range of about 1 Ohm to about 100 Ohms.

10. The rechargeable lithium-ion battery of claim 9 , wherein a weight ratio of the carbon conductive agent to the binder is in a range of about 1:1 to about 3:2.

11. The rechargeable lithium-ion battery of claim 9 , wherein the binder comprises PVDF.

12. The rechargeable lithium-ion battery of claim 9 , wherein the positive electrode has a volumetric capacity in a range of about 550 mAh/cc to about 570 mAh/cc.

13. The rechargeable lithium-ion battery of claim 9 , the weight ratio of the carbon conductive agent to the binder is characterized by the positive electrode having a dry resistance in a range of about 1 Ohm to about 10 Ohms.

14. The rechargeable lithium-ion battery of claim 9 , wherein the rechargeable lithium-ion battery can be charged to at least 90% state of charge in a range of about 5 minutes to about 15 minutes.

15. A rechargeable lithium-ion battery comprising:
a negative electrode comprising a first active material comprising Li 4 Ti 5 O 12 ;
a positive electrode comprising:
a second active material comprising LiCoO 2 ;
a carbon conductive agent; and
a binder, wherein a weight ratio of the carbon conductive agent, C, to the binder, PVDF is characterized by one or more of:
12.5−362.6·C+356.1·PVDF+(C−0.020)·((PVDF−0.023)·(−39629.6)<15(mins);  1)

623.34−1251.85·C−1577.78·PVDF+7407.41·(C−0.0195)·((PVDF−0.023)>550 (mAh);  2)

0.164+4.82·C−8.47·PVDF−664.4·(C−0.0195)·((PVDF−0.023)<0.2(%); or  3)

−0.278−7.648·C+66.78·PVDF+623.34−1251.853592.59·(C−0.0195)·((PVDF−0.023)>0.5 (lbs).  4)

16. The rechargeable lithium-ion battery of claim 15 , wherein the carbon conductive agent is a mixture of carbon black and graphite.

17. The rechargeable lithium-ion battery of claim 15 , wherein the positive electrode has a dry resistance in a range of about 1 Ohm to about 10 Ohms.

18. The rechargeable lithium-ion battery of claim 15 , wherein the positive electrode comprises a LiCoO 2 weight content in a range of about 95% to about 98%.

Assignees

• Medtronic Inc

Inventors

• Ye Hui
• Tamirisa Prabhakar A

Classifications

• 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

• H01M4/623

  fluorinated polymers · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• H01M10/0525

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

• H01M10/44

  Methods for charging or discharging (circuits for charging H02J7/00) · CPC title