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Improvements in battery technology do not always occur, as the breakthroughs claimed by a group of engineers at Northwestern University are even rarer. Harold Kung, a Chinese-American professor, and his research team have stated that they have successfully increased the lithium-ion battery's power storage and charging speed by 10 times.
According to Professor Kung, the key lies in how lithium ions move between graphene layers. The speed of these ions passing through the graphene layer in the battery directly affects the charging speed. To speed up this process, Professor Kung decided to stab millions of tiny pores with a diameter of only 10 to 20 nanometers in the graphene layer of the cell, providing ions with a "shortcut" to another layer. As a result, these punctured batteries were found to be 10 times faster than traditional batteries, and they could be fully charged from zero to within 15 minutes.
This result failed to meet the researcher, Professor Kung and his team began to increase the battery capacity. They inject small bundles of silicon between layers of graphene to increase the density of lithium ions. This method utilizes the plasticity of graphene to avoid the problem of silicon expansion encountered during the previous improvement of the amount of stored electricity, allowing more ions to accumulate at the electrode.
A battery made in this way can be used for more than one week per charge. Professor Kung said that it is now almost the best of both worlds. Silicon provides higher energy density, while the sandwich reduces the loss of capacity due to the expansion and contraction of silicon. Even if these silicon clusters split, they will not lose silicon.
However, this battery still has a drawback. After charging 150 times, the power storage and charging speed are greatly attenuated. But as Professor Kung pointed out, the increase in the amount of electricity will be enough to make up for this shortcoming. In an interview with the British Broadcasting Corporation (BBC), he said that even after charging 150 times, which is equivalent to one or more years of operation, this battery is five times more efficient than the lithium-ion batteries currently on the market.
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