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

Liyuan Liu; Yih-Chyng Wu; Patrick Rozier; Pierre-Louis Taberna; Patrice Simon

doi:10.34133/2019/6585686

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

Research (Wash D C). 2019 Nov 29:2019:6585686. doi: 10.34133/2019/6585686. eCollection 2019.

Authors

Liyuan Liu^{1

2}, Yih-Chyng Wu^{1

2}, Patrick Rozier^{1

2}, Pierre-Louis Taberna^{1

2}, Patrice Simon^{1

2}

Affiliations

¹ CIRIMAT, UMR CNRS 5085, Université Paul Sabatier Toulouse III, 118 route de Narbonne, 31062 Toulouse, France.
² RS2E, Réseau Français sur le Stockage Electrochimique de l'Energie, FR CNRS 3459, 80039 Amiens CEDEX, France.

Abstract

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 205 mA h g^-1, long cycle life (>97% capacity retention after 200 cycles at 3.0 C), and high-rate performance (117 mA h 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.