The present invention relates to a method for combining anode pre-lithiation, limited-voltage formation cycles, and accelerating aging via heated storage to maximize specific capacity, volumetric capacity density and capacity retention of a lithium-ion electrochemical cell.

The present disclosure relates to the synthesis and evaluation of difluorophosphate additives for use in energy storage devices. The difluorophosphate additive may be selected from the group consisting of lithium difluorophosphate (LFO), sodium difluorophosphate (NaFO), ammonium difluorophosphate (AFO), tetramethylammonium difluorophosphate (MAFO), potassium difluorophosphate (KFO), and combinations thereof. In some instances, the difluorophosphate additive is not lithium difluorophosphate (LFO).

A battery of the present disclosure includes a positive electrode, a negative electrode, and an electrolyte layer provided between the positive electrode and the negative electrode. The positive electrode contains a positive electrode active material and a first solid electrolyte. The electrolyte layer contains a second solid electrolyte. The first solid electrolyte contains lithium and two or more types of anions. The second solid electrolyte contains lithium and two or more types of anions. The molar ratio of Br to the two or more types of anions contained in the first solid electrolyte is smaller than the molar ratio of Br to the two or more types of anions contained in the second solid electrolyte.

A method of generating a charge/discharge protocol of an additional charging/discharging operation included in an activation method with respect to assembled secondary batteries is provided. The method includes operation (a) of measuring a secondary battery thickness increase rate over time while repeating charging/discharging between a first voltage and a second voltage higher than the first voltage with respect to a first secondary battery; operation (b) of performing, at least once, an operation of performing operation (a) with respect to a second secondary battery after fixing the second voltage and changing the first voltage; operation (c) of determining one of first voltages except for a first voltage at a lowest rate from among measured secondary battery thickness increase rates as a lower limit voltage; and operation (d) of setting a protocol so that charging/discharging is repeated between the lower limit voltage and the second voltage.

A battery cell includes a positive electrode, a negative electrode, and a separation film provided between the positive electrode and the negative electrode. A variation ratio of thickness of a battery cell before a pressurizing jig is disconnected and after the pressurizing jig is disconnected is equal to or less than 0.009, and the variation ratio of thickness of a battery cell is defied by a value generated by dividing a variation value of thickness that is a difference between the thickness of a battery cell after the pressurizing jig is disconnected and the thickness of a battery cell before the pressurizing jig is disconnected by the thickness of a battery cell before the pressurizing jig is disconnected.

A method of producing a lithium-ion battery includes filling at least one cell of the battery with an electrolyte followed directly with a first step of sealing the at least one cell and a second step of applying pulsating compression to the at least one cell during formation charging, the pulsating compression comprising alternating a first time period of applying a first compression force F.sub.1 greater than zero and a second time period of applying a second compression force F.sub.2, wherein F.sub.1>F.sub.2, and the formation charging includes a first charge of the battery.

Electrochemical cells comprising electrodes comprising lithium (e.g., in the form of a solid solution with non-lithium metals), from which in situ current collectors may be formed, are generally described.

Systems, methods, and computer-readable media are disclosed for dynamic adjustments to battery parameters using battery metrics. The device may be configured to determine a first value indicative of a battery voltage output during a first time interval, determine a second value indicative of a temperature during the first time interval, and determine a first acceleration factor for the battery during the first time interval based at least in part on the first value and the second value. The device may determine an adjusted number of charge cycles completed during the first time interval using the first acceleration factor, determine a total adjusted number of charge cycles of the battery, determine that the total adjusted number of charge cycles is equal to or greater than a first threshold, and cause the first maximum output voltage value to be reduced.

A method for producing a nonaqueous electrolyte secondary battery, and a production system therefor, that allow forming a SEI film in a shorter time. The method includes assembly, initial charging, and high-temperature aging steps. At least one from the initial charging and the high-temperature aging has the following sub-steps: a step of performing an AC impedance measurement on the battery and, on the basis of the AC impedance measurement, calculating an ionic conductivity of an SEI film that is formed the surface of a negative electrode of the battery; and a step of determining whether the calculated ionic conductivity falls within a predetermined range or not, and terminating the initial charging step or the high-temperature aging step when the ionic conductivity falls within the predetermined range, and continuing the initial charging step or the high-temperature aging step when the ionic conductivity does not fall within the predetermined range.

An energy storage device according to an aspect of the present invention includes a negative electrode and a positive electrode, the negative electrode includes a negative substrate and a negative active material layer directly or indirectly layered on the negative substrate, the negative active material layer contains a negative active material, the negative active material contains solid graphite particles as a main component, the aspect ratio of the solid graphite particles is 1 or more and 5 or less, and a negative electrode utilization factor that is the proportion of the amount of charge per mass of the negative active material in a full charge state to a theoretical capacity per mass of graphite is 0.65 or more.