A Convenient Approach to Mo6S8 Chevrel Phase Cathode for Rechargeable Magnesium Battery

A two-step solution chemistry route was used to synthesize ternary Chevrel phase (Cu2Mo6S8) with 5 h annealing at 1000 degrees C under reducing atmosphere. The approach marks a synthesis route different from hitherto described conventional solid-state methods. X-ray diffraction and scanning electron micrograph shows the formation of similar to 1-1.5 mu m size cuboidal shape Cu2Mo6S8 crystals with unit cell dimensions a similar to 0.96245 nm and c similar to 1.01987 nm of molar volume similar to 818.14 x 10(-3) nm(3). De-cuprated Mo6S8 exhibits a discharge capacity similar to 76 mAhg(-1) with good capacity retention up to similar to 50 cycles when cycled at the current rate of 20 mA/g (similar to C/6). The excellent rate capability and high Coulombic efficiency (similar to 99.3% at similar to 1.5C rate) of the Mo6S8 cathode renders the solution chemistry route an alternative approach for the synthesis of cuprated Chevrel phase: a known cathode system for magnesium battery. (C) 2014 The Electrochemical Society. All rights reserved.