Scientists have achieved a conductive polymer coating to create reliable high-capacity batteries. In this respect informs Lawrence Berkeley National Laboratory.
In nature, there are two fundamentally different types of conductivity – ordinary and ionic. The usual situation is observed in conductors, which allow electrons to move freely among themselves and transfer a negative charge to a positive electrode. In the ionic conductivity provided by salt solutions in water, it is ions, not electrons, that move.
The developed HOS-PFM coating has both ionic and electronic conductivity. Aluminum and silicon electrodes were coated with this material and their performance was tested in a lithium-ion battery. Silicon and aluminum are promising electrode materials for lithium-ion batteries due to their high energy storage capacity. However, these cheap and common materials wear out quickly after a few charge/discharge cycles.
During experiments, the researchers demonstrated that the HOS-PFM coating prevents degradation of silicon and aluminum-based electrodes while maintaining high battery capacity over 300 cycles. This puts them on par with today’s smaller capacity batteries in terms of durability. The authors hope their invention will be useful in many industries that require high power and energy density, including electric vehicles.
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