Three dimensional oxides for the batteries of the future
In recent years, researchers have found that some positive electrode materials benefit from a “bonus” of storage capacity through the activity of anionic species in addition to action activity. This activity has until now been proved only for a specific class of materials lamellar oxides with a two-dimensional structure (in 2D) which have still limited performances. The richness of the family of three-dimensional oxides opens up new opportunities in the search for new materials with exacerbated capacity for the batteries of the future. This work is published in the journal Nature Materials.
The lithium-ion technology present in our company is currently used in the rechargeable batteries equipping the electronic devices of our daily life smartphones laptops. It is also the most promising technology in terms of applications for electric vehicles. However, it still suffers from limitations particularly in terms of life expectancy safety and autonomy.
To improve the performance of these batteries scientists are testing new materials for positive electrodes which could increase the amount of energy contained in the battery or capacity via its positive electrode which is currently the Weak point of the battery. For this reason, the most explored by scientists is the use of Li-rich”materials whose chemical composition enriched in lithium allows increasing the capacities of the cathodes.
This has recently been highlighted by the researchers of the Laboratory chemistry of solid and energy in iridium oxides of lamellar two-dimensional structure. Despite their promising performances their lamellar structure is not conducive to the flow of Li during the discharge which leads to the destruction of the material. Indeed, the propagation is made difficult by the passage of one lamella to the other.