METHOD FOR DETERMINING EXTENT AND TYPE OF CAPACITY FADE
First Claim
1. A method of determining extent and type of capacity fade of an electrochemical cell comprising:
- identifying a first volume fraction of a first active material in a first electrode at a first time;
identifying a first capacity of the first electrode at a second time;
identifying a second volume fraction of the first active material based upon the first capacity;
identifying a first amount of the first active material lost from the first electrode from the first time to the second time based upon the first volume fraction and the second volume fraction;
identifying a third volume fraction of a second active material in a second electrode at about the first time;
identifying a second capacity of the second electrode at about the second time;
identifying a fourth volume fraction of the second active material based upon the second capacity; and
identifying a second amount of the second active material lost from the second electrode from about the first time to about the second time based upon the third volume fraction and the fourth volume fraction.
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Accused Products
Abstract
A method of determining extent and type of capacity fade of an electrochemical cell in one embodiment includes identifying a first volume fraction of an active material in an electrode, identifying a first capacity of the first electrode at another time, identifying a second volume fraction of the first active material based upon the first capacity, identifying a first amount of the first active material lost from the first time to the second time based upon the first volume fraction and the second volume fraction, identifying a third volume fraction of an active material in another electrode, identifying a second capacity of the second electrode at a later time, identifying a fourth volume fraction of the second active material based upon the second capacity, and identifying a second amount of the second active material lost based upon the third volume fraction and the fourth volume fraction.
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Citations
17 Claims
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1. A method of determining extent and type of capacity fade of an electrochemical cell comprising:
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identifying a first volume fraction of a first active material in a first electrode at a first time; identifying a first capacity of the first electrode at a second time; identifying a second volume fraction of the first active material based upon the first capacity; identifying a first amount of the first active material lost from the first electrode from the first time to the second time based upon the first volume fraction and the second volume fraction; identifying a third volume fraction of a second active material in a second electrode at about the first time; identifying a second capacity of the second electrode at about the second time; identifying a fourth volume fraction of the second active material based upon the second capacity; and identifying a second amount of the second active material lost from the second electrode from about the first time to about the second time based upon the third volume fraction and the fourth volume fraction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of determining extent and type of capacity fade of an electrochemical cell comprising:
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quantifying a first change in the volume fraction of active material in a negative electrode; quantifying a second change in the volume fraction of active material in a positive electrode; comparing the first change and the second change; and determining a side reaction loss based upon the comparison. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification