# US 2018/0026259 A1 · Mixed Redox Couple Electrodes for Rate Capability and Overdischarge Protection

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- Number: US 2018/0026259 A1
- Document ID: US20180026259A1
- Status: Published application
- Kind: A1
- Application number: 15/545,882
- Filed: 2016-01-22
- Published: 2018-01-25
- Earliest claimed: 2015-01-22
- Assignees: University of Florida Research Foundation, Inc.; G4 Synergetics, Inc.
- Applicants: University of Florida Research Foundation, Inc.; G4 Synergetics, Inc.
- Inventors: Kevin William Powers; Michael D. Kellar; Jon K. West; Julius O. Regalado
- Web page: https://patentgrep.com/patent/US20180026259A1

## CPC

- H01M 4/364: {as mixtures}
- H01M 4/136: Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
- H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
- H01M 4/5825: {Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/052: Li-accumulators
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- 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 composite electrode is a composite of conductive materials of at least a first material and a second material, wherein the first material undergoes a parasitic reaction in a region where the second material is stable, and the first material and second material are stable at the first material's nominal voltage. An exemplary electrode is a cathode comprising lithium manganese oxide (LMO) and lithium iron phosphate (LFP).

## Claims

### Claim 1

A composite electrode, comprising a composite of at least a first material and a second material, wherein the first material and the second material are stable at the first material's nominal voltage and the second material's nominal voltage is higher than that of the first material.

### Claim 2 (depends on 1)

The composite electrode according to claim 1, wherein the electrode is a cathode comprising lithium manganese oxide (LMO) as the first material and lithium iron phosphate (LFP) as the second material.

### Claim 3 (depends on 1)

The composite electrode according to claim 1, wherein the first material and the second material are at different proportions at different portions of the electrode to promote uniform current distribution, and wherein the second material is a majority in the portions of the electrode that would be poorly participating if constructed of a single material.

### Claim 4 (depends on 1)

The composite electrode according to claim 1, wherein the first material undergoes a parasitic reaction in a region where the second material is stable.

### Claim 5 (depends on 1)

A battery comprising one or more composite according to claim 1 in one or more cells of the battery.