Metal oxide is a promising anode material in LIBs, which can be further improved by covering with few-layered graphene oxide (FL-rGO). Furthermore, the formation of oxygen vacancies can greatly improve the electrochemical performance; however, the concentration regulation of oxygen defects remains a challenge. In this work, a facile in situ calcination was explored to synthesize Ta₂O₅@FL-rGO core-shell nanospheres with abundant oxygen vacancies between Ta₂O₅ and few-layered graphene oxide. And the as-prepared Ta₂O₅@FL-rGO exhibited highly electrochemical performance, including superior conductivity, high reversible capacity (442.3 mA h g⁻¹ at 0.1 A g⁻¹ after 100 cycles), good cycling performance (288.7 mA h g⁻¹ at 5 A g⁻¹ over 600 cycles), and excellent rate capability, compared with that of bare Ta₂O₅ and other Ta₂O₅ based electrode in the literature.

Ta₂O₅@few-layered rGO core-shell nanospheres with abundant oxygen vacancies were obtained by in-situ calcination and exhibited highly electrochemical performance as LIBs anode materials.

金属氧化物是LIB中很有希望的阳极材料，可以通过覆盖几层氧化石墨烯（FL-rGO）进一步加以改进。此外，氧空位的形成可以大大提高电化学性能。然而，氧缺陷的浓度调节仍然是一个挑战。在这项工作中，探索了一种简便的原位煅烧方法，以合成Ta ₂ O ₅ @ FL-rGO核-壳纳米球，在Ta ₂ O ₅和几层氧化石墨烯之间具有大量的氧空位。所制备的Ta ₂ O ₅ @ FL-rGO具有高电化学性能，包括优异的电导率，高可逆容量（在0.1 A g时为442.3 mA h g ^-1-1后100个循环），良好的循环性能（288.7毫安ħ克^-1在5 A G ^-1超过600个循环），以及优异的倍率性能，与裸的Ta相比₂ ö ₅和其它的Ta ₂ ö ₅基于电极在文献。

通过原位煅烧获得了具有大量氧空位的Ta ₂ O ₅几层rGO核壳纳米球，并作为LIBs阳极材料具有很高的电化学性能。