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Sunday, April 6, 2014

Li-ion batteries made from cheap materials and energy-efficient

A group of researchers recently developed a silicon anode, which is a replacement for graphite anode materials of lithium-ion batteries. In theory, silicon anode capacity amounts to 3,600 mAh/g, ten times greater than the capacity of the anode graphite

They developed a silicon anode battery, with a capacity of over 1,100 mAh/g to 600 times stable use. Using silicon anode can increase the storage ion at the cathode and anode. The new lithium-ion battery development turned out to see the problem, the use of silicon anode electrode can fade due to excessive development of the number of ions.
Evaluation of silicon anodes in terms of capacity, cycle number, current rate, and production cost. The color scheme represents the cycle number; the symbol represents the current rate; the numbers next to each symbol refer to other projects referenced in the paper. The position of the Si anode developed by the USC team is indicated by the red arrow. (Picture from: http://www.greencarcongress.com/)
Professor Chongwu Zhou, an electrical engineer who led the USC Viterbi School of Engineering team last year, and develop anode designs that using porous silicon nanowires, the design effectively solve the problem of the battery electrodes flexibility.

"Our method is very inexpensive in producing nano-porous silicon, and can be produced on a large scale. Thing that makes more promising silicon anode for lithium-ion batteries are more large capacity and high performance."

Jiepeng Rong and other members of the team also developed a method of coating the lining batteries with graphene oxide powder mixed with sulfur, to increase capacity.

Sulfur is a promising cathode, because sulfur has the ability to ten times stronger, than other cathode. With digabungnya sulfur and graphene oxide, cathode battery capacity will increase by 800 mAh/g to 1,000 times of use.

For next step, Rong will also incorporate silicon anode with a sulfur cathode, to maximize the capacity and performance of lithium ion batteries. *** [EKA | FROM VARIOUS SOURCES | SCIENCE DAILY]
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