Battery New Technology: Li-ion Battery Charge Speed Increases By 10 Times

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(Free-Press-Release.com) December 6, 2011 -- Battery technology improvement does not often occur; just as a group of engineers in U.S. Northwestern University said, breakthrough is quite rare. Chinese American professor Harold Kung and his research team declared they had succeeded in upgrading charge capacity and charge speed of lithium battery by 10 times.

Professor Kung pointed out they have understood how lithium ions among each layer graphene move. These ions' speed of running through battery graphene layers directly affect charge speed. In order to fasten this speed, Professor Kung decided to stab millions of tiny hole with 10 to 20nm diameter on the battery grapheme, in order to provide a "shortcut" for ions entering another layer. Result proved that charge speed of these stabbed battery was ten times faster than that of traditional battery. Battery could achieve full charge within 15 minutes.

Researchers were not satisfied with the above result. Professor Kung and his team began to raise battery charge capacity. They injected small cluster silicon into each graphene layers to increase density of lithium ions. This method has used graphene's plasticity to avoid silicon expansion problem, which happened on previously improving charge capacity, so that more ions could be accumulated on electrodes.

Discharge time of battery manufactured in this way could exceed one week. Professor Kung said that the above result had solved two problems: silicon could provide higher energy density and layer decreased capacity loss caused by silicon expansion and contraction. Silicon would not lose even if these silicon cluster splits.

However, there is a disadvantage on this battery. After 150 times’ charge, charge capacity and charge speed will substantially fall. Nevertheless, just as Professor Kung indicated, increase of charge capacity could mend this defect. In the BBC's interview, he expressed that even after 150 times charge, battery usage time equals a year or more, whose efficiency is 5 times higher than lithium-ion batteries in the current market.

Reference: http://www.large-battery.com/

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