New energy vehicles, communications and portable devices require lithium-ion batteries for high capacity and high endurance. Lithium-ion batteries urgently need to be updated to increase capacity, cycle and size. At present, the silicon-carbon negative electrode of lithium battery is all kinds of carbon materials mainly composed of graphite, and its theoretical capacity is only 372 mAh/g. In practical application, it is close to the theoretical capacity, and the theoretical capacity of nano-silica powder is much higher than that of graphite-based carbon material. It can reach 4200mAh/g and has relatively abundant resources. It is the main choice for new silicon carbon anode materials.
According to foreign media reports, the University of Alberta chemists aim to create a new generation of silicon-based lithium batteries, which has a 10-fold increase in charge capacity compared to current battery cells.

Jillian Buriak, a chemist and researcher at the University of Alberta in Canada, said: "We want to conduct a variety of tests to see the different effects of different sizes of nano-silica particles on internal cracking of the battery."

For large-capacity batteries, the application potential of nano-silica powder is large, because the material is rich in reserves, compared with graphite, the nano-silicon material in the battery absorbs a large amount of lithium ions. However, after repeated charge and discharge, the nano-silicon material is prone to chipping or fracture, because the material expands and shrinks itself after being absorbed and released, and is prone to cracks.
According to current research, if silicon is made into nano-sized particles, wires or tubes, it helps to prevent its cracking. Buriak and his team wanted to understand the extent to which the volume of such structures needed to optimize the properties of the nanosilicon material and minimize its adverse effects.
The researchers divided silicon nanoparticles into four different sizes and dispersed them evenly in highly conductive graphene aerogels with nanoscale pores that compensate for nanosilica particles. Insufficient conductivity. They found that within a range of 1 meter in diameter, there are 3 billion nano-sized particles that provide long-term stability after multiple charge and discharge cycles.
SAT Nano material Technology Co., Ltd. plans to supply 200 tons of nano-silicon powder for use in lithium battery silicon carbon anode materials. The process is stable, quality assurance, and large quantity and excellent price. The nano-silica powder is prepared by variable current laser ion beam gas phase method. The product has high purity, good dispersion performance, small particle size, uniform distribution, large specific surface area, high surface activity, low bulk density, good activity and large industrial output.

Buriak explains: “As the size of the particles shrinks, we find that the control of stress is enhanced because of lithium-based alloying and dealloying 'breathes'.”
The study shows that the technology can be used in a variety of applications that rely on battery energy storage devices. Imagine that if the size of the car battery of the user's electric car is the same as that of the Tesla battery, but the cruising range will increase by 10 times, the charging time will be shortened to 1/10 of the previous one, and the weight of the car battery is only The previous 1/10.
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