Researchers at the Argonne National Laboratory in Argonne, IL, have managed to improve lithium-ion batteries to make them last longer, be more reliable and safer.
The improvements come from a change in the materials used to manufacture the battery. First of all, safety has been improved. Today’s lithium-ion batteries contain cobalt oxide electrodes, which when overheating occurs produces oxygen, reacts with the solvent in the battery and increases the overheating further; occasionally leading to the laptop fires we have all seen on YouTube. The researchers have managed to replace some of the cobalt oxide with maganese oxide, which is more stable and therefore cuts the risk of this happening.
Reliability improvements come in the form of an increased number of charges. This was achieved by replacing some of the metal oxide in the electrode with electro-chemically inactive material to form a composite. The composite does not store energy and makes the battery more stable meaning it survives more charges and does not degrade the amount of charge available after many charges have occurred.
A side effect of the use of the composite is the battery can also hold up to 30% more charge. This is because the inactive materials allow more lithium to be used for storing energy within the battery.
These improved batteries may be making their way into laptops fairly rapidly as a licensing deal has already been done with Japanese company Toda Kogyo. They manufacture around 30 million batteries a year making the chances high they will be in laptops sooner rather than later.
Read more at TechnologyReview.com
Matthew’s Opinion
This is a different breakthrough to the one reported in December last year where researchers increased the capacity of a lithium-ion batteries 10x. In that case the anode had been created with silicon instead of carbon, where as in this case it is the lithium and metal oxides that are being altered. Combining this breakthrough and the silicon anode should theoretically take the storage capacity even higher.
There is no suggestion that the changes made will have an impact on price. However, if I was a manufacturer of laptops and started recieving batteries that gave a 30% increased charge time I would be marketing it as soon as possible. New models carrying the batteries may appear and vendors may try and charge a premium for them.
The fact the update to the battery design offers better safety and reliability means they will hopefully start getting used across the board fairly rapidly. Other battery manufacturers will be forced to license the tech as vendors will be asking for the increased safety, reliability and charge time as soon as one of their rivals gets a shipment.
I am still looking forward to the day I can hover over the battery meter on my laptop and it reads “30hrs remaining”. Whether that will happen any time soon is anyone’s guess, but these incremental breakthroughs help get us there.
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