How do single-walled carbon nanotubes "assist" lithium-ion batteries t
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2022/10/29 15:46:35
In traditional fuel cars, to make a car go further, we usually think of ways to make the car more fuel efficient, or make the tank of the car bigger. Then how to make a tram run further? Similarly, there are also two ways: one is to reduce the comprehensive energy consumption of the tram; the other is to improve the capacity of the power battery, but the volume space of the power battery is limited. How to increase the capacity of a battery in a limited space, next, we will mention an important battery index parameter: energy density.
Silicon material
Lithium-ion batteries for electric vehicles have an energy density of about 240-280Wh/kg, and there is no mass-produced battery with an energy density that can actually be used to power an electric vehicle with a range of 1000 km. Improving the energy density of batteries is also a top priority in battery development. To improve the energy density of the battery, a silicon-based anode system can be used in the negative electrode, which is expected to reach 350Wh/kg.
Silicon material is not perfect, in the battery charge and discharge process, silicon expansion can reach 400%, resulting in cracking between silicon particles, loss of electrical contact, resulting in negative failure, simple understanding is that although the use of silicon negative battery has a better battery life, but also reduce the life of the battery.
Single-walled carbon nanotubes
SWNTS solve the key problems of silicon-based negative electrodes, and prolong the cycle life of negative electrodes significantly. SWNTS can increase the cycle life of negative electrodes by 4 times. Due to their unparalleled conductivity, high strength, flexibility, high aspect ratio, and ability to form a developed network inside the material with very little addition amount, SWNTS can cover the surface of silicon particles and establish highly conductive and durable connections between silicon particles after introduction of silicon negative electrodes.
This prevents rupture of the anode material, in which case the silicon anode has a perfect cycle life, sufficient to meet the requirements of the most stringent EV manufacturers.
Increase SiOx content, help 350Wh/kg energy density
Currently, the industry's leading lithium ion manufacturers have recognized the addition of TUBALL™ SWNTS in silicon negative electrode systems to achieve battery energy densities of up to 300Wh/kg and 800Wh/L, while enabling fast battery charging. Compared with high-quality lithium-ion batteries on the market, the range of batteries containing SWNTS can be increased by more than 15%!
OCSiAl's research team has shown that the energy density of cells in the silicon negative electrode can be increased to 350wh/kg by adding TUBALL SWNTS.
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