Nanocomposite on graphene and silicon will improve lithium-ion batteries. Free Technical Library News

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Nanocomposite on graphene and silicon will improve lithium-ion batteries

06.08.2014

Specialists from the South Korean Institute UNIST (Ulsan National Institute of Science and Technology) have developed a technology that will improve electric batteries.

Recently, attempts have been repeatedly made to use nanocomposites based on graphene and silicon to improve the electrochemical characteristics of batteries. Unfortunately, a common weak point of such batteries is a low initial current efficiency, electrical contact failure and destruction due to significant volume changes during the charge-discharge process. This leads to a significant decrease in capacitance and an increase in internal resistance.

UNIST scientists have proposed an innovative approach to solving the problem. They used amorphous silicon nanoparticles on a graphene framework (a-SBG) in the anode of a lithium-ion battery. The a-SBG structure provides a uniform distribution of silicon islands (particles smaller than 10 nm) on both sides of the graphene sheets, thereby ensuring the stability of the anode during repeated charge-discharge cycles.

The composite showed outstanding elasticity: the particle size is restored to the original after each cycle, and the thickness of the electrode is reduced as a result of self-compacting.

As a result of the experiments, a specific capacity of 468 Wh/kg and 288 Wh/kg was demonstrated with a specific power of 7 kW/kg and 11 kW/kg, respectively.

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What will happen to this supercontinent in the future? A scientist doesn't look that far. Perhaps Pangea Ultima will again begin to disintegrate, following the example of the first Pangea.

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