Congratulations to Gozde ONEY, 2nd year PhD student in our group at ICMCB and LRCS, who won the RS2E “poster prize” at GFECI2022 in Sète for her study on the control of morphology and order in the LiNi0.5Mn1.5 O4 spinel.
New high-capacity Co- and Ni- free Li1+xTi1-xS2 layered materials
In the context of efforts to develop at the same time high energy density cathode materials for lithium-ion batteries with low content of critical elements such as cobalt and new cell chemistries for all-solid-state batteries, a novel family of lithium-rich layered sulfides (Li[LitTi1-t]S2, 0 < t ≤ 0.33) belonging to the LiTiS2-Li2TiS3 system was investigated as intercalation materials. These sulfides, in which both cations and anions are involved in the redox process, display common features with isotype Li-rich layered oxides. In a particular composition range, they exhibit high electrochemical performance with a reversible capacity and an energy density exceeding respectively 265 mAh⋅g-1 and 600 Wh⋅kg-1, a very low irreversible capacity in the first cycle, fast activation and a limited voltage decay. Their operation potential within the electrochemical stability window of sulfide-based fast ionic conductors makes them promising cathode materials for all-solid-state lithium and Li-ion batteries.
- Flamary-Mespoulie F., Boulineau A., Martinez H., Suchomel M. R., Delmas C., Pecquenard B., Le Cras F. Lithium-rich layered titanium sulfides: Cobalt- and Nickel-free high capacity cathode materials for lithium-ion batteries. Energy Storage Materials 2020, vol. 26, p. 213-222. DOI : 10.1016/j.ensm.2019.12.033
- PhD Thesis of F. Flamary, Université de Bordeaux, 2016