Battery system, and method of using the same and battery pack including the same

A method of using a battery system, comprising:

• manufacturing a battery system including one or more secondary batteries and a control unit that is configured to set a driving voltage range for charging and discharging of the secondary batteries;
• and
• setting the driving voltage range such that a maximum driving voltage of the secondary battery is in a range of 4.00 V to 4.08 V and a minimum driving voltage of the secondary battery is in a range of 2.98 V to 3.07 V through the control unit and the charging and discharging the secondary battery for at least one cycle,
• wherein the secondary battery includes a negative electrode including a silicon-based active material, a positive electrode facing the negative electrode, a separator interposed between the negative electrode and the positive electrode, and an electrolyte.