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US 12,695,097 B2Granted
Electrodes, electrochemical cells, and methods for making electrodes
AssigneeGM Global Technology Operations LLC
InventorsMeng Jiang, Meinan He, Louis G. Hector, Jr.
Life of this patent
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Abstract
Electrodes, electrochemical cells and methods for making electrodes are provided. In one example, an electrode includes an electrode base material. The electrode further includes an oxygen-scavenger material that is disposed on the electrode base material.
Claims16
An electrode for an electrochemical cell, the electrode comprising:
- an electrode base material that is a positive electroactive material configured as particles having respective outer surfaces;
- and
- an oxygen-scavenger material that is an intermediate oxidation state compound coated overlying the respective outer surfaces of the particles;
- wherein the intermediate oxidation state compound is capable of chemically reacting with oxygen released from the electrode base material during at least one of use, cycling, and charging of the electrochemical cell at a state of charge of about 80% or greater to be consumed and form a product compound having a higher degree of oxidation than the intermediate oxidation state compound, such that the oxygen is chemically bound in the product compound and is no longer available as a reactive gas within the electrochemical cell.
1 more element
An electrochemical cell comprising:
- a positive electrode comprising:
- a positive electrode base material configured as particles having respective outer surfaces;
- and
- an oxygen-scavenger material that is an intermediate oxidation state compound coated overlying the respective outer surfaces of the particles;
- wherein the intermediate oxidation state compound is capable of chemically reacting with oxygen released from the positive electrode base material during at least one of use, cycling, and charging of the electrochemical cell at a state of charge of about 80% or greater to be consumed and form a product compound having a higher degree of oxidation than the intermediate oxidation state compound, such that the oxygen is chemically bound in the product compound and is no longer available as a reactive gas within the electrochemical cell;
- a negative electrode;
- a separator disposed between the positive and negative electrodes, wherein the separator is electrically insulating and ionically conductive;
- and
- an electrolyte operatively disposed between the positive and negative electrodes and interfacing with the separator to conduct ions between the positive and negative electrodes.
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D) A method for making an electrode of an electrochemical cell, the method comprising:
- coating respective outer surfaces of particles of a positive electrode base material with an oxygen-scavenger material that is an intermediate oxidation state compound such that the intermediate oxidation state overlies the respective outer surfaces of the particles to form a coated electrode base powder;
- wherein the intermediate oxidation state compound is capable of chemically reacting with oxygen released from the positive electrode base material during at least one of use, cycling, and charging of the electrochemical cell at a state of charge of about 80% or greater to be consumed and form a product compound having a higher degree of oxidation than the intermediate oxidation state compound, such that the oxygen is chemically bound in the product compound and is no longer available as a reactive gas within the electrochemical cell;
- and
- binding the coated electrode base powder together with a binder.
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Dependencies are inferred from the claim text.