Lithium molybdate composited with carbon nanofibers as a high-capacity and stable anode material for lithium-ion batteries

Abstract

Transition metal molybdates have been studied as anode materials for high-performance lithium-ion batteries, owing to their high theoretical capacity and low cost, as well as the multivalent states of molybdenum. However, their electrochemical performance is hindered by poor conductivity and large volume changes during charge and discharge. Here, we report lithium molybdate (Li₂MoO₄) composited with carbon nanofibers (Li₂MoO₄@CNF) as an anode material for lithium-ion batteries. Li₂MoO₄ shows a shot-rod nanoparticle morphology that is tightly wound in the fibrous CNF. Compared with bare Li₂MoO₄, the Li₂MoO₄@CNF composite demonstrates superior high specific capacity and cycling stability, which are attributed to the reversible Li-ion intercalation in the Li_xMo_yO_z amorphous phase during charge and discharge. The capacity of the Li₂MoO₄@CNF anode material can reach 830 mAh g^-1 in the second cycle and 760 mAh g^-1 after 100 cycles at a charge/discharge current density of 100 mA g^-1, which is much better than the bare Li₂MoO₄. This work provides a simple method to prepare a high-capacity and stable lithium molybdate anode material for lithium-ion batteries.

Keywords

Li₂MoO₄ / carbon nanofibers (CNFs) / anode material / lithium-ion batteries

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