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A new method for imaging silicon anode degradation is expected to achieve better rechargeable batteries
Release time:
2023-11-10 19:08
Researchers suggest that a new method for characterizing the structure and chemical evolution of silicon, as well as a thin layer controlling battery stability, may help solve the problem of preventing the use of silicon in high-capacity batteries.
The focus of the research is on the interface between the anode, negative electrode, and electrolyte, which allows charges to move between the anode and another electrode (cathode). The solid electrolyte intermediate phase (SEI) layer is usually formed on the electrode surface between the solid electrode and the liquid electrolyte, which is crucial for the electrochemical reactions in batteries and controlling the stability of batteries. Using silicon as an anode can achieve better rechargeable batteries.
In the past 10 years, silicon has attracted a lot of attention as a high capacity negative electrode for rechargeable batteries. Zhang Sulin, a professor of engineering science and mechanics and bioengineering, said that currently commercial batteries use graphite as the negative electrode material, but the capacity of silicon is about 10 times that of graphite. Therefore, there are tens of millions, hundreds of millions, or even hundreds of millions of dollars spent on silicon battery research.
For a society that hopes to electrifie its infrastructure through electric vehicles and powerful portable electronic devices, this is good news, but there are also challenges. During the charging and discharging process of the battery, the volume of silicon will expand and contract, leading to cracking of the silicon material, and SEI will break and regenerate time and time again. This can lead to a loss of electrical contact and a decrease in capacity, which is the amount of charge stored in the battery.
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