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AssigneeEnvia Systems, Inc.
InventorsShabab Amiruddin, Subramanian Venkatachalam, Herman A. Lopez, Sujeet Kumar
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Improved cycling of high voltage lithium ion batteries is accomplished through the use of a formation step that seems to form a more stable structure for subsequent cycling and through the improved management of the charge-discharge cycling. In particular, the formation charge for the battery can be performed at a lower voltage prior to full activation of the battery through a charge to the specified operational voltage of the battery. With respect to management of the charging and discharging of the battery, it has been discovered that for the lithium rich high voltage compositions of interest that a deeper discharge can preserve the cycling capacity at a greater number of cycles. Battery management can be designed to exploit the improved cycling capacity obtained with deeper discharges of the battery.
A lithium ion battery comprising:
A method for first charging a secondary battery comprising a positive electrode comprising a lithium intercalation composition, a negative electrode comprising elemental carbon, a separator between the electrodes and an electrolyte comprising lithium ions, the method comprising:
A battery management system comprising a monitoring circuit, a charge-discharge circuit and a processor, wherein the monitoring circuit is operably connected to a lithium ion battery comprising a positive electrode comprising a lithium intercalation composition, a negative electrode comprising elemental carbon, a separator between the electrodes and an electrolyte comprising lithium ions, and wherein the processor is programmed to control the charging of the battery to a voltage of at least about 4.35 volts and to discharge the battery to a value of no more than about 2.25 volts at least one cycle of every 150 cycles.
A battery control system comprising a monitoring circuit, a charge-discharge circuit and a processor, wherein the monitoring circuit is operably connected to a lithium ion battery comprising a positive electrode comprising a lithium intercalation composition, a negative electrode comprising elemental carbon, a separator between the electrodes and an electrolyte comprising lithium ions, and wherein the processor is programmed to discharge battery to a voltage of no more than about 2.25 volts through a connection to a discharge load distinct from the circuits for an associated electrical device powered by the battery when the device is connected to an external power supply, and subsequently to charge the battery to a voltage of at least about 4.35 volts.
A method for cycling a secondary battery comprising a positive electrode comprising a lithium intercalation composition, a negative electrode comprising elemental carbon, a separator between the electrodes and an electrolyte comprising lithium ions, the method comprising:
Dependencies are inferred from the claim text.