Why Battery Re-charging Takes So Long ?

Replies

• 

  Pensu

  As far as I remember there was a news about an Indian origin girl claiming that she could charge a phone battery pretty fast. Try to Google it.
• 

  Abhishek Rawal

  Pensu

  As far as I remember there was a news about an Indian origin girl claiming that she could charge a phone battery pretty fast. Try to Google it.

  You mean this ? Charge your Phone In 20 Seconds Using Super-Capacitors.
  
  Well she can charge it for illuminating LEDs only at this moment.
  Still no development for smartphone battery charging in under 30 seconds 😀
  
  Again,My questions : I wonder, why does it take too long to re-charge the battery ?
  What's the process going on internally which is reason behind slow recharging of battery ?
• 

  Ramani Aswath

  I wonder, why does it take too long to re-charge the battery ?
  Because recharging is a chemical process. Speeding up may cause other unwanted reactions, which will irreparably damage the battery.
  
  What's the process going on internally which is reason behind slow recharging of battery ?
  In rechargeable batteries the reaction is reversible. During discharge the forward reaction takes place. The products of the reaction have a lesser energy. The difference appears as the usable current. During charging the energy of reaction is supplied to the reaction products produced during discharge. These absorb the energy and go back to the pre discharge high energy state and can deliver power again. However, chemistry being what it is any attempt to supply energy faster (meaning using a higher recharge voltage can trigger other unwanted reactions like gas generation) also to happen. This is counterproductive and can even be hazardous.
  
  A super capacitor on the other hand is not a battery. It does not store energy as chemical energy. It stores the electric charge as such. So it can be charged at very much faster rates. These will become future sources.
• 

  Abhishek Rawal

  A.V.Ramani

  Speeding up may cause other unwanted reactions, which will irreparably damage the battery.

  What are the unwanted reactions ? I would like to know that unwanted reaction's details 😀
• 

  Anand Tamariya

  Abhishek Rawal

  What are the unwanted reactions ? I would like to know that unwanted reaction's details 😀

  The only way to speed up a chemical reaction is to add a catalyst - but then the reaction is no more reversible.
• 

  Ramani Aswath

  Every chemical reaction is associated with an energy difference. In electro chemical cells this translates to a voltage difference. To charge faster higher voltage is applied. If there is a reaction that is associated with this voltage, then that also will take place. Not only this interferes with the normal charging process, it also leads to unwanted reaction products like gases are also generated that damage the battery.
  For example, in a lead acid battery sulphate formation can (ad does) happen leading to loss of capacity and eventual failure.
• 

  Prashant Munshi

  As far as the battery is concerned which depends on chemical reactions for running devices will require long but reasonable time for recharging since the chemical reaction is involved in recharging the same way when discharging. It is the process of ion deposition in the form of chemical compounds (different for different types of batteries) on electrodes which takes its time. Instant charging effort by providing high voltage will result into unsafe operation probably because heat generation is associated with most recharging process, moreover there may be possibility of breakdown of the electrolyte which makes the battery. Instant charging (almost <30 secs could be instant) is possible with capacitors but the size of the capacitors to hold the charge long enough for continually fed device like smartphones, will be very large. Electrolytic capacitors so far have successfully been made in small sizes with high capacity storage (The MF indicates the capacity) but still not enough to run the device like smartphone. But this would happen one day, that is for sure!!!
• 

  Ramani Aswath

  An update on supercapacitors that encroach on Lead-Acid batteries in capacity:
  Simple technique puts graphene capacitors on par with lead-acid battery | Ars Technica
• 

  Prashant Munshi

  Thanks Mr. Ramani for adding this knowledge to the forum. The research really holds the promise for capacitor based batteries with very low charging time.
• 

  Ahsanul haque

  Recently i heard a good about short time recharge battery it will take couple of minutes for recharge ur battery. American/ Chinese girl Invents this technology. thanks
  Engineer
• 

  Jeffrey Arulraj

  Ahsanul haque

  Recently i heard a good about short time recharge battery it will take couple of minutes for recharge ur battery. American/ Chinese girl Invents this technology. thanks
  Engineer

  This was covered in Voice about a while back
  Indian-US Girl Creates Supercapacitor To Charge Your Phone In < 20 Seconds
• 

  Ahsanul haque

  Conqueror

  This was covered in Voice about a while back
  Indian-US Girl Creates Supercapacitor To Charge Your Phone In < 20 Seconds

  Thanks yeah she is.....
• 

  Jeffrey Arulraj

  Ahsanul haque

  Thanks yeah she is.....

  An Indian Not American/ Chinese
• 

  Ahsanul haque

  🎉
• 

  Ahsanul haque

  yes 😀 now. i share some news about Indian scientist, i believe that she will get Nobel prize soon.
  she has creativity and pure skill.
  18-Year-Old Invents 30-Second Phone Charger | TIME.com
  #-Link-Snipped-#
  Thanks
  #-Link-Snipped-#