Kejten black modified 3D-framework ternary metal molybdate NaMnFe(MoO4)3 for new high-performance lithium/sodium-ion battery anodes

Abstract

The development of new high-performance anode materials for lithium/sodium secondary batteries is still one of the most important tasks. Herein, kejten black modified 3D-framework ternary metal molybdate NaMnFe(MoO4)3 was successfully synthesized by solid-state reaction combined with mechanical ball milling and first exploited for lithium/sodium-ion battery anodes. As tested for lithium-ion batteries, NaMnFe(MoO4)3-ketjen black composite demonstrated a high reversible capacity of 800 mA h g−1 at 100 mA g−1 after 50 cycles due to its high valence construction of polymetallic elements. While investigated for sodium-ion batteries, the as-prepared composite electrode delivered 215 mA h g−1at 100 mA g−1 after 100 cycles. Notably, after 800 cycles of continuous cycling, the reversible sodium storage was 155 mA h g−1 and 134 mA h g−1 at current densities of 0.5 A g−1 and 1 A g−1, respectively. In terms of long life results, the NaMnFe(MoO4)3-ketjen black composite is more suitable for sodium-ion batteries than lithium-ion batteries. Because of the advantages of low cost, simple synthesis steps and mass production, NaMnFe(MoO4)3-ketjen black composite has tremendous potential for application in alkali metal secondary batteries, especially sodium-ion batteries. Meanwhile, this work also provides inspiration for the application of other new polymetallic molybdate materials in the field of energy storage.