Generation of wrinkle-free silicon monoxide electrodes using separate preformation and formation

Patent metadata

Field	Value
Publication number	US-9966631-B1
Application number	US-201715659942-A
Country	US
Kind code	B1
Filing date	Jul 26, 2017
Priority date	Jul 26, 2017
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

A solid electrolyte interface is formed on a silicon monoxide electrode in a battery cell. After the solid electrolyte interface is formed on the silicon monoxide electrode, the battery cell is charged for one or more initial cycles while the battery cell is compressed.

First claim

What is claimed is:

1. A method, comprising:
forming a solid electrolyte interface on a silicon monoxide electrode in a battery cell; and
after the solid electrolyte interface is formed on the silicon monoxide electrode, charging the battery cell for one or more cycles while the battery cell is compressed, including by:
applying a first charging current to the battery cell while the battery cell is compressed, wherein the first charging current is applied over a first amount of time and up to a first voltage;
in response to the battery cell reaching the first voltage, discharging the battery cell while the battery cell is compressed;
after the first charging current has been applied and the battery cell has been discharged, applying a second charging current to the battery cell while the battery cell is compressed, wherein: the second charging current is applied over a second amount of time and up to a second voltage, the first amount of time is greater than the second amount of time, and the first voltage is less than or equal to the second voltage; and
in response to the battery cell reaching the second voltage, discharging the battery cell while the battery cell is compressed.

2. The method recited in claim 1 , wherein forming the solid electrolyte interface includes:
forming a partial solid electrolyte interface, including by applying a third charging current to the battery cell while the battery cell is uncompressed; and
forming the solid electrolyte interface from the partial solid electrolyte interface, including by applying a fourth charging current to the battery cell while the battery cell is compressed.

3. The method recited in claim 1 further comprising:
after the solid electrolyte interface is formed on the silicon monoxide electrode and before the first and the second charging currents are applied and the battery cell is discharged in response to the battery cell reaching the first and the second voltage, compressing the battery cell at room temperature; and
after the first and the second charging currents are applied and the battery cell is discharged in response to the battery cell reaching the first and the second voltage, compress the battery cell while the battery cell is heated.

4. The method recited in claim 1 , wherein forming the solid electrolyte interface includes:
forming a partial solid electrolyte interface, including by applying a third charging current to the battery cell while the battery cell is uncompressed, wherein the third charging current is applied over a third amount of time and up to a third voltage; and
forming the solid electrolyte interface from the partial solid electrolyte interface, including by applying a fourth charging current to the battery cell while the battery cell is compressed, wherein: the fourth charging current is applied over a fourth amount of time and up to a fourth voltage, the third amount of time is greater than the fourth amount of time, and the third voltage is less than the fourth voltage.

5. The method recited in claim 1 , wherein:
forming the solid electrolyte interface includes:
forming a partial solid electrolyte interface, including by applying a third charging current to the battery cell while the battery cell is uncompressed; and
forming the solid electrolyte interface from the partial solid electrolyte interface, including by applying a fourth charging current to the battery cell while the battery cell is compressed; and

the method further includes:
after the solid electrolyte interface is formed on the silicon monoxide electrode and before the first and the second charging currents are applied and the battery cell is discharged in response to the battery cell reaching the first and the second voltage, compressing the battery cell at room temperature; and
after the first and the second charging currents are applied and the battery cell is discharged in response to the battery cell reaching the first and the second voltage, compress the battery cell while the battery cell is heated.

6. A computer program product, the computer program product being embodied in a non-transitory computer readable storage medium and comprising computer instructions for:
forming a solid electrolyte interface on a silicon monoxide electrode in a battery cell; and
after the solid electrolyte interface is formed on the silicon monoxide electrode, charging the battery cell for one or more cycles while the battery cell is compressed, including by:
applying a first charging current to the battery cell while the battery cell is compressed, wherein the first charging current is applied over a first amount of time and up to a first voltage;
in response to the battery cell reaching the first voltage, discharging the battery cell while the battery cell is compressed;
after the first charging current has been applied and the battery cell has been discharged, applying a second charging current to the battery cell while the battery cell is compressed, wherein: the second charging current is applied over a second amount of time and up to a second voltage, the first amount of time is greater than the second amount of time, and the first voltage is less than or equal to the second voltage; and
in response to the battery cell reaching the second voltage, discharging the battery cell while the battery cell is compressed.

Assignees

• Kitty Hawk Corp

Inventors

• Li Chen
• Herring Patrick K

Classifications

• C01B33/113

  Silicon oxides; Hydrates thereof {(preparing monoxide by reduction of siliceous material C01B33/182)} · CPC title

• C01B33/02

  Silicon (forming single crystals or homogeneous polycrystalline material with defined structure C30B) · CPC title

• H01M4/0469

  Electroforming a self-supporting electrode; Electroforming of powdered electrode material · CPC title

• H01M10/0525

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

• H01M4/386

  Silicon or alloys based on silicon · CPC title