Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5459351 | Journal of Alloys and Compounds | 2017 | 9 Pages |
Abstract
Layered double hydroxides (LDHs), also known as hydrotalcite-like anionic clays, are very convenient precursors with a tunable flexibility toward multifunctional nanomaterials, especially in energy storage. Typical methods to improve lithium storage are to introduce additional or self-generating carbonaceous supports to LDH-derived transition metal oxides as anode nanomaterials which can host lithium mainly though a conversion mechanism. Here, we describe a preparation of mesoporous spinel ferrite composite (MgFe2O4/ZnFe2O4) for lithium storage, which is assisted by a combined conversion and alloying mechanism. The composite is derived by a thermal decomposition of a scalablely produced single-resource precursor of ternary Mg2+Zn2+Fe3+-layered double hydroxide (Mg2+Zn2+Fe3+-LDH), and subsequent selective etching. Electrochemical test shows that the electrode delivers an exceptional electrochemical performance, i.e., a reversible capacity of 1190 mA h gâ1 after 100 cycles at 100 mA gâ1, and, in particular, a reversible capacity of 981 mA h gâ1 at 500 mA gâ1 after 330 cycles, as well as a reversible capacity of 541 mA h gâ1 at 2000 mA gâ1 after 1000 cycles. The high electrochemical performance could be attributed to the following features: the combined alloying and conversion mechanisms of ZnFe2O4, synergistic MgFe2O4, and slight-content MgO as a non-active matrix, as well as an appropriate specific area and mesoporous size distribution. Our results show that the cation-tunable LDH precursor-derived synthesis route might be an alternative to prepare multiple-component composites of spinel ferrites and transition metal oxides.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Duan Wang, Jingli Wu, Daxun Bai, Rongrong Wang, Feng Yao, Sailong Xu,