Green Template‐Free Synthesis of Hierarchical Shuttle‐Shaped Mesoporous ZnFe2O4 Microrods with Enhanced Lithium Storage for Advanced Li‐Ion Batteries |
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| Authors: | Prof. Linrui Hou Hui Hua Lin Lian Hui Cao Siqi Zhu Prof. Changzhou Yuan |
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| Affiliation: | 1. School of Materials Science and Engineering, Anhui University of Technology, Ma'anshan, 243002 (P. R. China);2. Chinese Academy of Science (CAS) Key Laboratory of Materials for Energy Conversion, Hefei, 230026 (P. R. China) |
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| Abstract: | In the work, a facile and green two‐step synthetic strategy was purposefully developed to efficiently fabricate hierarchical shuttle‐shaped mesoporous ZnFe2O4 microrods (MRs) with a high tap density of ～0.85 g cm3, which were assembled by 1D nanofiber (NF) subunits, and further utilized as a long‐life anode for advanced Li‐ion batteries. The significant role of the mixed solvent of glycerin and water in the formation of such hierarchical mesoporous MRs was systematically investigated. After 488 cycles at a large current rate of 1000 mA g?1, the resulting ZnFe2O4 MRs with high loading of ～1.4 mg per electrode still preserved a reversible capacity as large as ～542 mAh g?1. Furthermore, an initial charge capacity of ～1150 mAh g?1 is delivered by the ZnFe2O4 anode at 100 mA g?1, resulting in a high Coulombic efficiency of ～76 % for the first cycle. The superior Li‐storage properties of the as‐obtained ZnFe2O4 were rationally associated with its mesoprous micro‐/nanostructures and 1D nanoscaled building blocks, which accelerated the electron transportation, facilitated Li+ transfer rate, buffered the large volume variations during repeated discharge/charge processes, and provided rich electrode–electrolyte sur‐/interfaces for efficient lithium storage, particularly at high rates. |
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| Keywords: | anodes hierarchical microrods Li‐ion batteries mesoporous ZnFe2O4 |
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