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News Link • Science, Medicine and Technology

How to boost lithium battery performance – just add crushed silicon

•, By Jason Falconer
 Researchers at Rice University and Lockheed Martin may have developed a low-cost method of creating longer-lasting, high-capacity lithium-ion batteries. Currently graphite is used as the anode in commercial li-ion products, despite the fact that a silicon anode could potentially store ten times more lithium ions. The team says it has solved one of the problems associated with silicon, which nearly triples the energy density of current li-ion designs.
Engineer Sibani Lisa Biswal and research scientist Madhuri Thakur had been working on a porous silicon film with sponge-like properties, but wanted to create something more applicable to the current battery manufacturing process.
They discovered that by crushing the film, the resulting powder had a surface area 50 times that of regular crushed silicon. The result is an anode material that can hold a charge of 1,000 milliamp hours per gram compared to graphite anodes, which store 350 mAh/g – and that's only a third of its theoretical capacity.

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