CONTEXT

Since the introduction of the first Li-ion battery by Sony in the nineties, demands for batteries with enhanced performances are increasing. LIB are widely used in laptop, cellular phones, electronic products (cameras, mp3 readers,…). They also penetrating the market of power tools and are studied also as candidates in hybrid vehicles.

Conventional materials for cathodes are oxides such as LCO, NMC or NCA, spinelles phases or olivine structures (LFP).

Sulfate-based materials are interesting as they should theoritically have higher potential than phosphate-based materials.

TECHNICAL DESCRIPTION

The invention described a new family of fluoro sulfate materials having a distorded tavorite structure and corresponding to Li/NaMSO₄F. In addition their synthesis is also described and claimed.

Members of this family are LiFeSO₄F, LiCoSO₄F, LiNiSO₄F, LiFe_1-yMn_ySO₄F, NaFeSO₄F, NaCoSO₄F,…

BENEFITS

– Easy synthesis (fast and economic)
– Good electrochemical performances (one inserted lithium by fluorinated oxyanion unit)

INDUSTRIAL APPLICATIONS

Exemples of possible synthesis :
LiFePO₄, Na₂FePO₄F, Na₂MnPO₄F, Na₂(Fe_xMn_1-x)PO₄F, LiFePO₄F, NaFeSO₄F, LiTiPO₄F, LiFeSO₄F, LiCoSO₄F, LiNiSO₄F, LiFe_1-yMn_ySO₄F, FeSO₄F, …

DEVELOPMENT STAGE

Synthesis were made at a laboratory scale and electrochemical tests were done on the obtained powders.

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