Chemist scientists have found that with the help of silicon nanoparticles, it is possible to overcome the limitations of its use in lithium-ion batteries, which allows you to create new generation devices that are capable of keeping 10 times more energy.
Silicon increases the energy intensity of fuel cells due to the ability to absorb much more lithium than graphite used in modern devices. The problem is that in the process of charging-discharge, it expands and shrinks, due to which its structure is gradually collapsed. However, researchers from the University of Alberta experimentally found that the nanormal particles of silicium retain their structure after repeated absorption and release of lithium ions.
Chemists studied nanocrystals of four different sizes. In the course of experiments, they evenly distributed them in highly conductive mesoporous graphene airgels synthesized from carbon to compensate for low silicon conductivity. As a result, it was found that the smallest variant of particles with a cross-sectional diameter of 3×10-9 m are most sustainable and stable. After 500 cycles, nanocomposites demonstrated the preservation of 90% of the specific container (1100 mAh / g) at a current density of 400 mA / g.
According to scientists, the opening can apply in any devices associated with energy accumulation. This will allow a ten times to increase their energy intensity or to the same amount to reduce their size, while retaining the previous possibilities.
Next, the team plans a faster and less expensive way to create silicon nanostructures to ensure their commercial use.