Xie Ying, Xiong Xiang, Han Kai
State Key Laboratory for Powder Metallurgy, Powder Metallurgy Research Institute, College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China.
Materials (Basel). 2021 Feb 27;14(5):1115. doi: 10.3390/ma14051115.
Ammonium molybdate tetrahydrate ((NH)MoO) (AMT) is commonly used as the precursor to synthesize Mo‑based oxides or sulfides for lithium ion batteries (LIBs). However, the electrochemical lithium storage ability of AMT itself is unclear so far. In the present work, AMT is directly examined as a promising anode material for Li‑ion batteries with good capacity and cycling stability. To further improve the electrochemical performance of AMT, AMT/polydopamine (PDA) composite was simply synthesized via recrystallization and freeze drying methods. Unlike with block shape for AMT, the as‑prepared AMT/PDA composite shows flake morphology. The initial discharge capacity of AMT/PDA is reached up to 1471 mAh g. It delivers a reversible discharge capacity of 702 mAh g at a current density of 300 mA g, and a stable reversible capacity of 383.6 mA h g is retained at a current density of 0.5 A g after 400 cycles. Moreover, the lithium storage mechanism is fully investigated. The results of this work could potentially expand the application of AMT and Mo‑based anode for LIBs.
四水合钼酸铵((NH₄)₂MoO₄)（AMT）通常用作合成锂离子电池（LIBs）的钼基氧化物或硫化物的前驱体。然而，到目前为止，AMT本身的电化学储锂能力尚不清楚。在本工作中，直接将AMT作为一种具有良好容量和循环稳定性的锂离子电池阳极材料进行研究。为了进一步提高AMT的电化学性能，通过重结晶和冷冻干燥方法简单合成了AMT/聚多巴胺（PDA）复合材料。与AMT的块状形态不同，所制备的AMT/PDA复合材料呈现片状形态。AMT/PDA的初始放电容量达到1471 mAh/g。在300 mA/g的电流密度下，它具有702 mAh/g的可逆放电容量，在0.5 A/g的电流密度下经过400次循环后，仍保留383.6 mA h/g的稳定可逆容量。此外，还对储锂机制进行了充分研究。这项工作的结果可能会扩大AMT和钼基阳极在LIBs中的应用。
