The University of Waterloo, Canada is working on perfecting the lithium-ion battery by looking at the negative anode. 

Graphite is currently being used to make the negative electrodes in the batteries. However, the material has become out of date because of the limited amount of energy it can store. Silicon is looking like an effective replacement.

When graphite is used, the maximum theoretical capacity of the battery is 370 mAh/g (milliamp hours per gram), while by using silicon the theoretical capacity jumps to 4,200 mAh/g. Silicon is also a much cheaper material.

The new battery they designed has a capacity of than 1,000 mAh/g (or over 2,275 cycles), while the team is also sure that it will have a 40 to 60 percent increase in energy density over normal lithium-ion batteries.

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