Is it bad to fully charge your smartphone?

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Is it bad to fully charge your smartphone?

As the ease of charging with wireless technology increases, the problem becomes: Is it bad that the mobile device battery is always fully charged?

Venkat Srinivasan, head of the Argonne Energy Storage Science Center (ACCESS), says that smartphones and tablet batteries cannot be overcharged, but electronic devices don't allow them, so keeping them fully charged will accelerate degradation. It was.

“To be honest, the more you are tired of charging 90%, 95% to 100%, the more likely you are in [Wireless Charging] state, the more likely your battery will deteriorate.

When the lithium ion battery is charged and discharged, ions reciprocate between the positive electrode (lithium-cobalt oxide or lithium iron phosphate) and the negative electrode (made of carbon graphite).

When the battery is charged, the positive electrode releases lithium ions, moves to the negative electrode, and is stored as energy. When the battery is discharged, these ions return to the positive electrode and are used as electricity. As these lithium ions move back and forth, the electrolyte acting as a transport medium degrades over time.

Srinivasan says that the higher the state of charge, the faster the electrolyte will degrade.

Therefore, it is best not only to put your smartphone at the bottom, but also to prevent the charging and discharging pendulum from shaking wildly.

“In general, swinging the battery charge from top to bottom can have the worst battery life. Srinivasan said if the battery could be cycled from 45% to 55%. Do not fully charge.

Note that Srinivasan is too sensitive to charging smartphones and tablets. Most smartphone manufacturers are designed to use batteries for 2-3 years. As a result, consumers who typically replace mobile phones do not need to be overly concerned about the charging rate.