Safer lithium ion batteries: add water, lose the oxygen

A safer, lower-cost variation on the lithium ion battery has become a realistic possibility, now that scientists have found a way to add water to it. A group of researchers has found that by eliminating the oxygen in a lithium-sulfate-and-water electrolyte solution, they were able to significantly improve the batteries' capacity retention—but only for very small capacities.

Aqueous lithium ion batteries are a less-dangerous, inexpensive replacement to standard lithium ion batteries, which use electrolyte solutions that can be toxic and flammable. However, battery makers typically avoid aqueous electrolytes for one reason: they don't work well at all.

A typical aqueous lithium ion battery retains only 50 percent of its charge capacity after one hundred cycles. As any notebook computer owner can tell you, a capacity of 50 percent after a thousand cycles is hardly acceptable in a battery, and less than that is cause for loud complaint.

However, by playing around with the aqueous solution, a group of scientists found that the pH of the liquid didn't matter much to the effectiveness of the battery. They tried removing as much oxygen as possible from the battery and readjusting the pH, and found that, in combination with carbon-coated electrodes, the batteries' capacity retention improved to 90 percent after a thousand cycles.

So will notebook batteries soon last forever, impervious to trifles like charge cycles? Unlikely— the battery with the impressive retention only provided about 10 minutes of power. Another similar battery that lasted eight hours at low current output retained 85 percent capacity after only 50 cycles.

So, the aqueous lithium ion battery is still a long way from replacing its toxic brethren. Still, the authors speculate that cheaper batteries may find use in "short-distance city-buses" and as storage for energy from wind turbines and solar panels. Notebook users will continue to wait for a capacity retention hero.

Comments
Add comment

Your name:
Sign in with:
or
Your comment:


Enter code:

E-mail (not required)
E-mail will not be disclosed to the third party


Last news

 
 
Highlights of the new feature update include a tweaked interface with Fluent Design elements
 
It’s now open to third-party developers and designed for smart home devices
 
Prices start at $1499 for the 13.5-inch model and $2499 for the 15-inch model
 
Users claim the Start menu isn’t working after the upgrade
 
It will release its first all-purpose AI chips by the end of 2017
 
Android 8.1 Oreo arriving on Pixel phones "in the coming weeks"
 
The Snapdragon 636 also comes with support for modern ultra-wide FHD+ displays
The Samsung Galaxy A5 (2017) Review
The evolution of the successful smartphone, now with a waterproof body and USB Type-C
February 7, 2017 /
Samsung Galaxy TabPro S - a tablet with the Windows-keyboard
The first Windows-tablet with the 12-inch display Super AMOLED
June 7, 2016 /
Keyboards for iOS
Ten iOS keyboards review
July 18, 2015 /
Samsung E1200 Mobile Phone Review
A cheap phone with a good screen
March 8, 2015 / 4
Creative Sound Blaster Z sound card review
Good sound for those who are not satisfied with the onboard solution
September 25, 2014 / 2
Samsung Galaxy Gear: Smartwatch at High Price
The first smartwatch from Samsung - almost a smartphone with a small body
December 19, 2013 /
 
 

News Archive

 
 
SuMoTuWeThFrSa
1234567
891011121314
15161718192021
22232425262728
293031    




Poll

Do you use microSD card with your phone?
or leave your own version in comments (4)