IT House reported on May 25th, according to China Science News, the team of Academician Yu Shuhong of the University of Science and Technology of China and the team of Professor Yao Hongbin and Ni Yong are committed to solving the contradiction between high energy density and fast charging performance of lithium-ion batteries.A novel dual-gradient graphite anode material was proposed and prepared to achieve 60% charging of lithium-ion batteries within 6 minutesthe results were recently published in “Science Advances”.
Source: Tesla official website
The charging time of electric vehicles is much longer than that of traditional fuel vehicles, mainly due to the poor rate performance of the graphite negative electrode in lithium-ion batteries, which limits the fast charging capability of electric vehicles. To improve the rate capability of graphite anodes, the traditional strategy is to make graphite electrodes porous or thin. However, these methods often sacrifice the energy density of the prepared battery. Yu Shuhong’s team started with designing the electrode structure to improve the fast charging performance of lithium-ion batteries while ensuring the energy density.
The research team developed a low-viscosity polymer-free binder slurry self-assembly technology. The copper-coated graphite anode particles and copper nanowires were mixed in an ethanol solution to make a slurry, and graphite particles of different sizes were used to settle in the slurry. speed difference,Successfully constructed a dual gradient structure optimized by simulation calculation to obtain electrodes. Li-ion batteries based on this novel dual-gradient graphite anode material were charged from zero to 60% and 80% in 5.6 minutes and 11.4 minutes, respectively, while maintaining high energy density.
The biggest highlight of this research is the completion of a process from hypothesis, theoretical model establishment to experimental revalidation, which provides new ideas for overcoming the contradiction between the high energy density and fast charging performance of lithium-ion batteries.
IT Home understands that,The research is still far from industrializationFor example, the current laboratory preparation method is difficult to achieve large-scale production, and the design of the double gradient structure is difficult to maintain the consistency of the electrode. Currently, the team is gradually addressing these issues. The hope is that such more efficient batteries could one day power electric vehicles.
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