Non-destructive method for detecting failure of cell

1 . A non-destructive method for detecting failure of a cell, the method comprising:

preparing a cell containing a carbon-based material as an anode active material;

charging the cell;

x-ray diffraction (XRD) scanning the charged cell inward from an end of an anode of the charged cell; and

determining whether or not an LiC 6 peak of the anode is observed in a region after a signal of an anode current collector appears in XRD scans,

wherein the determining comprises detecting a cell failure if the LiC 6 peak is observed immediately after the signal of the anode current collector appears in the XRD scans, and

wherein the detecting the cell failure is used to eliminate the cell with the cell failure from deployment.

2 . The non-destructive method of claim 1 , wherein:

the charging the cell is performed at 4 volts (V) or higher.

3 . The non-destructive method of claim 1 , wherein:

the XRD scanning is performed once toward an inner region of the anode from the end of the anode, or performed at least once toward the inner region from the end of the anode and at least once toward the inner region from another end of the anode.

4 . The non-destructive method of claim 1 , wherein:

the detecting the cell failure comprises detecting the cell failure if the region is observed in which an LiC 6 peak intensity relative to a sum of the LiC 6 peak intensity and an LiC 12 peak intensity (I LiC6 /(I LiC6 +I LiC12 ) is 0.3 or more immediately after the signal of the anode current collector appears in the XRD scans.

5 . The non-destructive method of claim 1 , wherein:

the cell is an overhanging cell or a sliding cell.

6 . The non-destructive method of claim 5 , wherein:

for the overhanging cell, an area of a cathode is formed larger than an area of the anode; and

for the sliding cell, the end of the anode slides so that loading of the anode is lowered relative to loading of a cathode in a corresponding region.

7 . The non-destructive method of claim 1 , wherein the cell failure is an overhang or sliding cell failure.

8 . The non-destructive method of claim 1 , wherein the observation of the LiC 6 peak is performed by measuring the LiC 6 peak by an LiC 6 peak intensity relative to a sum of the LiC 6 peak intensity and an LiC 12 peak intensity (I LiC6 /(I LiC6 +I LiC12 )).

9 . A non-destructive method for detecting failure of a cell, the method comprising:

preparing a cell containing a carbon-based material as an anode active material;

charging the cell;

x-ray diffraction (XRD) scanning the charged cell inward from an end of an anode of the charged cell; and

determining whether or not an LiC 6 peak of the anode is observed in a region after a signal of an anode current collector appears in XRD scans,

wherein the determining comprises detecting a cell failure if the region is observed in which an LiC 6 peak intensity relative to a sum of the LiC 6 peak intensity and an LiC 12 peak intensity (I LiC6 /(I LiC6 +I LiC12 )) is 0.8 or more in the region immediately after the signal of the anode current collector appears, and

wherein the detecting the cell failure is used to eliminate the cell with the cell failure from deployment.

10 . A non-destructive method for detecting failure of a cell, the method comprising:

preparing a cell containing a carbon-based material as an anode active material;

charging the cell;

x-ray diffraction (XRD) scanning the charged cell inward from an end of an anode of the charged cell; and

determining whether or not an LiC 6 peak of the anode is observed in a region after a signal of an anode current collector appears in XRD scans,

wherein the observation of the LiC 6 peak is performed by measuring the LiC 6 peak by an LiC 6 peak intensity relative to a sum of the LiC 6 peak intensity and an LiC 12 peak intensity (I LiC6 /(I LiC6 +I LiC12 )),

wherein the determining comprises detecting a cell failure, and

wherein the detecting the cell failure is used to eliminate the cell with the cell failure from deployment.

11 . The non-destructive method of claim 10 , wherein:

the determining comprises detecting the cell failure if the LiC 6 peak intensity of the anode in the region after the signal of the anode current collector appears in the XRD scans decreases from the end of the anode to an inner region of the anode.

12 . The non-destructive method of claim 9 , wherein the charging the cell is performed at a state of charge (SOC) of 80% or more.