Formation process for lithium-ion batteries
First Claim
1. A method for producing a battery comprising:
- providing a battery comprising a positive electrode, a negative electrode, and an electrolyte comprising a solvent and a salt, wherein the capacity of the negative electrode is less than that of the positive electrode and the negative electrode comprises an active material having an average potential versus a lithium reference electrode of greater than approximately 1.0 volts; and
applying an initial charge to the battery and continuing the initial charge beyond the point where the battery is fully charged, wherein the initial charge after the battery is fully charged is applied for approximately 4 hours or more at a voltage that is greater than a fully charged voltage of the battery.
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Accused Products
Abstract
A method for producing a battery includes providing a battery having a positive electrode, a negative electrode, and an electrolyte that includes a solvent and a salt. The capacity of the negative electrode is less than that of the positive electrode and the negative electrode includes an active material having an average potential versus a lithium reference electrode of greater than approximately 0.2 volts. The method also includes applying an initial charge to the battery at a voltage that is greater than a fully charged voltage of the battery for a sufficient amount of time to cause at least a portion of the solvent to undergo a reduction reaction. The step of applying an initial charge to the battery acts to increase the irreversible capacity loss of the battery during the initial charge and provides the battery with enhanced tolerance to deep discharge conditions.
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Citations
29 Claims
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1. A method for producing a battery comprising:
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providing a battery comprising a positive electrode, a negative electrode, and an electrolyte comprising a solvent and a salt, wherein the capacity of the negative electrode is less than that of the positive electrode and the negative electrode comprises an active material having an average potential versus a lithium reference electrode of greater than approximately 1.0 volts; and applying an initial charge to the battery and continuing the initial charge beyond the point where the battery is fully charged, wherein the initial charge after the battery is fully charged is applied for approximately 4 hours or more at a voltage that is greater than a fully charged voltage of the battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method for producing a battery comprising:
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providing a battery comprising a positive electrode, a negative electrode, and an electrolyte comprising a solvent and a salt, wherein the capacity of the negative electrode is less than that of the positive electrode and the negative electrode comprises an active material comprising lithium titanate; and applying an initial charge to the battery and continuing the initial charge beyond the point where the battery is fully charged, wherein the initial charge after the battery is fully charged is applied for approximately 4 hours or more at a voltage that is greater than a fully charged voltage of the battery such that at least a portion of the solvent undergoes a reduction reaction and greater than approximately 12% irreversible capacity loss of the battery is created during the step of applying an initial charge and continuing the initial charge. - View Dependent Claims (20, 21, 22, 23)
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24. A method for producing a battery comprising:
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providing a battery comprising a positive electrode, a negative electrode, and an electrolyte comprising a solvent and a salt, wherein the capacity of the negative electrode is less than that of the positive electrode and the negative electrode comprises an active material having an average potential versus a lithium reference electrode of greater than approximately 1.0 volts; and while the battery is fully charged, applying a charge to the battery at a voltage that is greater than a fully charged voltage of the battery for a period of time greater than or equal to approximately 4 hours. - View Dependent Claims (25, 26, 27, 28, 29)
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Specification