Scientists Develop Method to Make Cheap Nano-Silicon Batteries With Sand

Sand to power your smartphone battery

Researchers have created a lithium ion battery that can outperform the current industry standard by three times using sand as the key material.

Zachary Favors from University of California, Riverside said:  “This is the holy grail — a low cost, non-toxic, environmentally friendly way to produce high performance lithium ion battery anodes,”.

Currently graphite is used in battery anodes, and further improvements on graphite are not viable.

To make better batteries, researchers are focused on nano silicon, the size of a billionth of a meter, as a replacement for graphite. Nano scale silicon, however, degrades quickly and is difficult to produce in a large quantity.

To get large quantities, Zachary used the most common source of silica, beach sand from a beach at Cedar Creek. 
Schematic showing how sand is turned into pure nano-silicon.
Schematic showing how sand is turned into pure nano-silicon.

This pure silicate sand was purified, powdered and then ground with salt and magnesium. This mixture was heated to remove oxygen from the quartz, resulting in pure silicon.

The team was fortunate that the pure nano-silicon formed had a porous three-dimensional silicon sponge like consistency. That porosity has proved to be the key to improving the performance of the batteries built with the nano-silicon.

The improved performance could mean expanding the expected lifespan of silicon-based batteries up to three times or more. This better battery could power electric vehicles, cellphones or tablets.
The findings appeared in the journal Nature Scientific Reports.

Sources:
1. University of California, Riverside 
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