A Solid-State Reaction in a Vapor Chamber: Synthesis of Bi2(MoO4)3 Nanorods as High-Capacity Anode for Lithium-Ion Batteries

Abstract

Conversion- and alloying-type materials have been investigated as alternatives to intercalating graphite anodes of lithium-ion batteries for recent decades. However, the electrochemical pulverization and limitations in large-scale production of metal oxides prohibit them from practical applications. This work provided an ambient solid-state reaction accelerated by water vapor for synthesizing Bi2(MoO4)3 nanorods combined with carbon under mild-condition ball-milling for composite fabrication. The obtained composite performs superior electrochemical performance: a delivered capacity of 802.2 mAh·g−1 after 300 cycles at a specific current of 500 mA·g−1 with a retention of 82.3%. This improvement was ascribed to the better accommodation to volume variation and reinforced physical contact raised by one-dimensional morphology and ball-milling treatment. The complex conversion-intercalation-alloying mechanism of the lithium-ion storage in Bi2(MoO4)3 anode was also clarified using cyclic voltammetry and ex situ X-ray photoelectron spectroscopy results.