Easy hydrothermal synthesis of multi-shelled La2O3 hollow spheres for lithium-ion batteries
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Herein, uniform triple-shelled La2O3 hollow spheres were synthesized for the first time by a facile one-pot hydrothermal method capable of controlling the number of internal thin-shells, which can be achieved by controlling the calcination temperature. Used as anodes for Li-ion batteries, the triple-shelled La2O3 hollow spheres show excellent cycling performance, good rate capacity, and high specific capacity. A superior capacity, up to 108 mAh g−1 with minimal irreversible capacity after 100 cycles is achieved at a current rate of 100 mA g−1. After the high-rate charge–discharge cycling, a specific discharge capacity as high as 190.1 mAh g−1 can be restored when the current density is reduced to 50 mA g−1 (theoretical specific capacity = 246.8 mAh g−1).
Financial support was provided by National Natural Science Foundation of China (Nos. 50771082 and 60776822). The project was also supported by Natural Science Basic Research Plan in Shaanxi Province of China (Program No. 2017JQ5116). The authors thank the colleagues in the laboratory of International Center for Dielectric Research for their support.
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