Ultrafast Synthesis of Calcium Vanadate for Superior Aqueous Calcium-Ion Battery

Liyuan Liu (1, 2) , Yih-Chyng Wu (1, 2) , Patrick Rozier (1, 2) , Pierre-Louis Taberna (1, 2) , Patrice Simon (1, 2)

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
2 RS2E - Réseau sur le stockage électrochimique de l'énergie

Recently, multivalent aqueous calcium-ion batteries (CIBs) have attracted considerable attention as a possible alternative to Li-ion batteries. However, traditional Ca-ion storage materials show either limited rate capabilities and poor cycle life or insufficient specific capacity. Here, we tackle these limitations by exploring materials having a large interlayer distance to achieve decent specific capacities and one-dimensional architecture with adequate Ca-ion passages that enable rapid reversible (de)intercalation processes. In this work, we report the high-yield, rapid, and low-cost synthesis of 1D metal oxides MV3O8 (M = Li, K), CaV2O6, and CaV6O16·7H2O (CVO) via a molten salt method. Firstly, using 1D CVO as electrode materials, we show high capacity 205mAh g-1, long cycle life (>97% capacity retention after 200 cycles at 3.0 C), and high-rate performance (117mAh g-1 at 12 C) for Ca-ion (de)intercalation. This work represents a step forward for the development of the molten salt method to synthesize nanomaterials and to help pave the way for the future growth of Ca-ion batteries.

Mots clés: Revetements; Traitements de Surface

Domaines: Matériaux

Liyuan Liu, Yih-Chyng Wu, Patrick Rozier, Pierre-Louis Taberna, Patrice Simon. Ultrafast Synthesis of Calcium Vanadate for Superior Aqueous Calcium-Ion Battery. Research, 2019, 2019, pp.1-11. ⟨10.34133/2019/6585686⟩. ⟨hal-03050839⟩