Speaker
Description
The increase in the market share of electric vehicles is strongly linked to the increase in autonomy, to the reduction of costs and charging time of batteries, without forgetting to mention that the new generations of batteries will have to offer at least the same life span and safety than current batteries. Concerning the anodes of Li-ion batteries, graphite-integrated silicon composite is an alternative to any graphite which should make it possible to reach the evoked performance objectives. This composite is already integrated in some commercial batteries and is part of the roadmap of many industrials of the sector.
If Silicon is one of the most promising negative electrode (in combination with Carbone) for LIB and sodium-ion (NIB) batteries its practical application is hindered by a series of obstacles. For lithium (Li), the access to high lithiated phases causes extreme volume expansion (310%), resulting in a rapid capacity fade and for sodium (Na), the slow kinetics and the ionic radius restrict the sodiation of c-Si. We have used various strategies to address these issues by playing i) on the nanostructuration of Si in a carbon matrix, ii) on the alloying of Si with higher conductive element such as Ge or iii) by preparing a lamellar Si structure. The latter approach will be detailed and discussed.
| Speaker Country | France |
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