Assembled hollow and core-shell SnO2 microspheres as anode materials for Li-ion batteries

Abstract SnO 2 microspheres with controllable morphology were prepared via a hydrothermal-annealing method. The SnO 2 morphology can be tuned by using AlOOH sol and γ-Al 2 O 3 as additive. The hollow SnO 2 microspheres with incomplete core-shell structure prepared with small amount of γ-Al 2 O 3 presented the best cycling performance in Li-ion battery, exhibiting a specific capacity of 374.2 mAh g −1 up to 100 cycles. The superior performance can be mainly attributed to the formation of more and smaller SnO 2 hollow microspheres and partial core-shell SnO 2 microspheres resulting from the γ-Al 2 O 3 condensation nucleus. The unique hollow and core-shell composite structure of SnO 2 is capable of reducing the volume changes during Li insertion–extraction.

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