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

Patent metadata

Field	Value
Publication number	US-10749211-B2
Application number	US-201815945955-A
Country	US
Kind code	B2
Filing date	Apr 5, 2018
Priority date	Jul 26, 2017
Publication date	Aug 18, 2020
Grant date	Aug 18, 2020

Abstract

A solid electrolyte interface is grown on a silicon monoxide electrode in a battery cell, including by charging the battery cell up to a first voltage while the battery cell is uncompressed in order to partially grow the solid electrolyte interface. After partially growing the partial solid electrolyte interface, the battery cell is rested. After resting the battery cell, the battery cell is charged to a second, higher voltage while the battery cell is compressed in order to further grow the partially grown solid electrolyte interface. After the solid electrolyte interface is grown on the silicon monoxide electrode, the battery cell is charged for one or more cycles while the battery cell is compressed.

First claim

What is claimed is:

1. A method, comprising:
growing a solid electrolyte interface on a silicon monoxide electrode in a battery cell, including by:
filling the battery cell with liquid electrolyte;
compressing the battery cell filled with the liquid electrolyte for a predetermined amount of time;
uncompressing the battery cell after the predetermined amount of time has passed;
charging the battery cell up to a first voltage while the battery cell is uncompressed in order to partially grow the solid electrolyte interface;
after partially growing the solid electrolyte interface, resting the battery cell while the battery cell is uncompressed and without applying charge to the battery cell;
after resting the battery cell:
compressing the battery cell; and
charging the battery cell up to a second voltage while the battery cell is compressed in order to further grow the partially grown solid electrolyte interface, wherein the second voltage is higher than the first voltage; and

after the solid electrolyte interface is grown on the silicon monoxide electrode, charging and discharging the battery cell for one or more cycles while the battery cell is compressed.

2. The method recited in claim 1 , wherein:
the battery cell is charged up to the first voltage over a period of 100 hours; and
the battery cell is charged up to the second voltage over a period of 30 hours.

3. The method recited in claim 1 , wherein the battery cell is charged up to the second voltage while the battery cell is compressed at a pressure within a range of 20 psi-60 psi.

4. The method recited in claim 1 , wherein:
the battery cell is charged up to the first voltage of 3.65 V;
the battery cell is held at the first voltage of 3.65 V while the battery cell is resting; and
the battery cell is charged up to the second voltage of 3.85 V.

5. The method recited in claim 1 further comprising:
after the solid electrolyte interface is grown on the silicon monoxide electrode and before the battery cell is charged and discharged for the one or more cycles while the battery cell is compressed, compressing the battery cell at room temperature; and
after the battery cell is charged for the one or more cycles while the battery cell is compressed, compress the battery cell while the battery cell is heated.

6. The method recited in claim 1 further comprising:
after the solid electrolyte interface is grown on the silicon monoxide electrode and before the battery cell is charged and discharged for the one or more cycles while the battery cell is compressed, compressing the battery cell at a pressure within a range of 100 psi-200 psi at room temperature; and
after the battery cell is charged for the one or more cycles while the battery cell is compressed, compress the battery cell at a pressure within a range of 100 psi-200 psi while the battery cell is heated.

7. The method recited in claim 1 further comprising:
after the solid electrolyte interface is grown on the silicon monoxide electrode and before the battery cell is charged and discharged for the one or more cycles while the battery cell is compressed, compressing the battery cell at room temperature within a range of 25° C.-50° C.; and
after the battery cell is charged for the one or more cycles while the battery cell is compressed, compress the battery cell while the battery cell is heated to a temperature within a range of 60° C.-100° C.

8. A computer program product, the computer program product being embodied in a non-transitory computer readable storage medium and comprising computer instructions for:
growing a solid electrolyte interface on a silicon monoxide electrode in a battery cell, including by:
filling the battery cell with liquid electrolyte;
compressing the battery cell filled with the liquid electrolyte for a predetermined amount of time;
uncompressing the battery cell after the predetermined amount of time has passed;
charging the battery cell up to a first voltage while the battery cell is uncompressed in order to partially grow the solid electrolyte interface;
after partially growing the solid electrolyte interface, resting the battery cell while the battery cell is uncompressed and without applying charge to the battery cell;
after resting the battery cell:
compressing the battery cell; and
charging the battery cell up to a second voltage while the battery cell is compressed in order to further grow the partially grown solid electrolyte interface, wherein the second voltage is higher than the first voltage; and

after the solid electrolyte interface is grown on the silicon monoxide electrode, charging and discharging the battery cell for one or more cycles while the battery cell is compressed.

Assignees

• Wisk Aero Llc

Inventors

• Li Chen
• Herring Patrick K

Classifications

• H01M4/043 Primary

  involving compressing or compaction · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M10/446

  Initial charging measures · CPC title

• H01M4/0438

  by electrochemical processing (electroless electrochemical plating C23C18/54) · CPC title

• H01M4/483

  for non-aqueous cells (H01M4/485 takes precedence) · CPC title