摘要
A hierarchically porous Zn(Co 1−x Mn x ) 2 O 4 anode is synthesized through a hydrothermal method. XRD measurements indicate that ZnCo 2 O 4 , ZnCo 1.5 Mn 0.5 O 4 , ZnCoMnO 4 , ZnCo 0.5 Mn 1.5 O 4 , and ZnMn 2 O 4 are isostructural in solid solution. Through analysis of X-ray photoelectronic spectra and EPMA and EDX mapping of Zn(Co 1−x Mn x ) 2 O 4 , it is confirmed that the valance of Mn is 3+ only, and that the Mn cation is distributed homogeneously in the ZnCo 2 O 4 -based structure. Interestingly, the pore-size distributions of these spinel-based anodes are tunable by changing the substituting content of Mn in the ZnCo 2 O 4 host. Compared with nanoporous ZnCo 2 O 4 and macroporous ZnMn 2 O 4 , the as-synthesized ZnCoMnO 4 nanospheres exhibit a high capacity of 823 mAh g −1 with excellent cycling retention of more than 80 cycles without decay. The excellent cyclability might be attributed to the nanosized particles and the nature of the hierarchical pore-size distribution. The results indicate that ZnCoMnO 4 is a good candidate as an anode for application in lithium-ion batteries.