This material is crucial when solid-state batteries have gained tremendous popularity.

2024-06-05

High energy density of more than 300Wh/kg or even 500Wh/kg, solid-state batteries can be described as "hanging" traditional liquid lithium batteries. "There is no increase in energy density from a liquid to a solid electrolyte." Industry insiders pointed out that the solid-state battery system provides higher safety redundancy and better phase for new positive and negative materials, and higher capacity negative or positive materials can be used.As a silicon-based negative electrode material with a theoretical specific capacity of more than 10 times that of graphite, it has now almost become the standard for solid/semi-solid batteries, and is paired with high energy positive electrode materials, making the battery energy density easily break through 300Wh/kg.

In terms of performance, silicon is indeed an ideal anode material for the next generation. Silicon has an ultra-high theoretical specific capacity of up to 4200mAh/g, more than 10 times higher than the capacity of traditional graphite materials (372mAh/g). Moreover, the silicon base has a lower delithium potential, and because its voltage platform is higher than that of graphite, it is more difficult to cause surface lithium ion precipitation during charging, and the comprehensive safety performance of the battery is better.

It is worth noting that for a long time, silicon-based materials have not achieved large-scale mass production because of the shortcomings of cyclic expansion. "It's a bottleneck. Because once the silicon expands during the charging and discharging process, it will inevitably lead to the damage of the material structure, and the rapid decay of the cycle will cause the battery to be unable to use." Industry insiders point out. Therefore, a technical core of silicon-based materials is how to make silicon smaller, so as to reduce its expansion during the process of lithium removal.

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