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According to the US Daily Science website on June 10, researchers at the Burns School of Engineering at the University of California, Riverside, have developed a new structure for the positive electrode of lithium-ion batteries that will allow mobile electronic devices to be fully charged within 10 minutes. Electricity, not the current hours. The positive electrode of this lithium battery is a three-dimensional cluster structure, which is formed by the polymerization of tapered carbon nanotubes coated with a silicon coating.
Lithium ion batteries are the first choice for rechargeable batteries used in mobile electronic devices and electric vehicles. However, this kind of battery also has defects. The battery in the electric vehicle occupies a large part of the weight of the car, and the battery size in the mobile electronic device also limits the "slimming" trend of the electronic product.
As a battery cathode material, silicon is currently receiving a lot of attention. If the positive electrode of graphite in a lithium-ion battery is replaced with a silicon positive electrode, the total battery power may increase by 63%, and the weight and size of the battery may be reduced by about 40%.
A recent paper published by Smar magazine states that through chemical vapor deposition and inductively coupled plasma processing, researchers at the University of California, Riverside have developed a new type of positive electrode structure for lithium-ion batteries. A three-dimensional cluster structure of silicon coated, conical carbon nanotubes.
Lithium-ion batteries based on this new structure exhibit strong charge-discharge characteristics and excellent cycle stability, even under high-strength charge and discharge conditions. Compared with the commonly used graphite-based positive electrode, its charging speed is nearly 16 times faster.
Wang Wei, the first author of the above paper, stated that the reason why the battery has an ultra-fast charge-discharge rate may be due to two reasons. The surface-covered graphene copper foil and the carbon nanotubes are seamlessly connected to strengthen the active material. Full contact with the current collector, thus facilitating the charge and heat transfer of the electrode system; the conical structure provides an interpenetrating narrow channel for the electrolyte to accelerate into and out of the electrode, which may enhance the performance of the battery charge and discharge.
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