Calcium Vanadate Micro/Nanostructures for Lithium-Ion Batteries

The ability to control the composition and structure of inorganic compounds by simple synthesis methods is essential to the design and development of electrode materials of lithium-ion batteries (LIBs). Here we report the controllable synthesis of calcium vanadate micro/nanostructures via a simple hydrothermal method. By easily adjusting the pH value of a reaction system, a Ca10V6O25 straw-bundle-like structure, Ca2V2O7 microplatelet, and CaV6O16 center dot 3H(2)O sponge-like macrostructure can be selectively synthesized. The regulation mechanism of different calcium vanadate micro/nanostructures was investigated. In addition, CaV6O16 center dot 3H(2)O and CaV6O16 center dot 3H(2)O/GO self-standing papers were obtained by pressing the sponge-like macrostructure and vacuum filtration, respectively. The electrochemical performances of the CaV6O16 center dot 3H(2)O and CaV6O16 center dot 3H(2)O/GO papers as the self-standing and binder-free anodes for LIBs were investigated for the first time. The as-obtained CaV6O16 center dot 3H(2)O/GO hybrid paper anode exhibits a high discharge capacity of 664.0 mA h g(-1) after 250 cycles at 200 mA g(-1) and good cycling stability, demonstrating its potential application as a self-standing anode for LIBs.