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[Li_tTi_1-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 (Li[Li_xM_1-x]O₂, M=Mn, Ni, Co,…). 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.

在努力同时开发用于锂离子电池的高能量密度阴极材料（具有低含量的关键元素，例如钴和用于全固态电池的新型电池化学方法）的过程中，一种新型的富锂层状材料硫化物（李[李_吨的Ti _1-T ] S ₂，0 <吨≤0.33）属于LiTiS ₂ -李₂的TiS ₃系统进行了研究作为嵌入材料。这些硫化物，其中的阳离子和阴离子都参与氧化还原过程，与同型的富含Li的层状氧化物（Li [Li _x M _1-x ] O ₂，M ＝ Mn，Ni，Co，…）。在特定的组成范围内，它们表现出较高的电化学性能，可逆容量和能量密度分别超过265 mAh·g ^-1和600 Wh·kg ^-1，在第一循环中具有非常低的不可逆容量，活化速度快且受限制电压衰减。它们在基于硫化物的快速离子导体的电化学稳定性窗口内的工作潜力使其成为用于全固态锂和锂离子电池的有前途的阴极材料。