# US 11,909,042 B2 · Positive electrode enabling fast charging

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,909,042 B2
- Document ID: US11909042B2
- Status: Granted
- Kind: B2
- Application number: 17/118,148
- Filed: 2020-12-10
- Published: 2022-06-16
- Granted: 2024-02-20
- Earliest claimed: 2020-12-10
- Assignees: Medtronic, Inc.
- Applicants: Medtronic, Inc.
- Inventors: Hui Ye; Prabhakar A. Tamirisa
- Web page: https://patentgrep.com/patent/US11909042B2

## CPC

- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/525: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
- H01M 4/485: of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence)
- H01M 4/623: {fluorinated polymers}
- H01M 4/625: {Carbon or graphite}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/44: Methods for charging or discharging (circuits for charging H02J7/00)
- H01M 2004/028: {Positive electrodes}
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A rechargeable lithium-ion battery includes a positive electrode enabling fast charging. A negative electrode has a first active material including Li4Ti5O12. A positive electrode includes a second active material including LiCoO2. 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.

## Claims

### Claim 1

A rechargeable lithium-ion battery comprising:
a negative electrode comprising a first active material comprising Li4Ti5O12;
a positive electrode comprising:
a second active material comprising LiCoO2, wherein a content of the LiCoO2 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.

### Claim 2 (depends on 1)

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

### Claim 3 (depends on 2)

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.

### Claim 4 (depends on 2)

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.

### Claim 5 (depends on 1)

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.

### Claim 6 (depends on 1)

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

### Claim 7 (depends on 1)

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.

### Claim 8 (depends on 1)

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.

### Claim 9

A rechargeable lithium-ion battery comprising:
a negative electrode comprising a first active material comprising Li4Ti5O12; and
a positive electrode comprising:
a second active material comprising LiCoO2, wherein a content of the LiCoO2 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.

### Claim 10 (depends on 9)

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.

### Claim 11 (depends on 9)

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

### Claim 12 (depends on 9)

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.

### Claim 13 (depends on 9)

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.

### Claim 14 (depends on 9)

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.

### Claim 15

A rechargeable lithium-ion battery comprising:
a negative electrode comprising a first active material comprising Li4Ti5O12;
a positive electrode comprising:
a second active material comprising LiCoO2;
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)

### Claim 16 (depends on 15)

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

### Claim 17 (depends on 15)

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.

### Claim 18 (depends on 15)

The rechargeable lithium-ion battery of claim 15, wherein the positive electrode comprises a LiCoO2 weight content in a range of about 95% to about 98%.