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

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.

SUBMITTER: Liu L 

PROVIDER: S-EPMC6944483 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature