We develop a facile approach to controlled-synthesize Fe₃O₄@[email protected]_X (MnO₂, Mn₃O₄ and MnO) hierarchical hollow nanospheres by using Fe₃O₄@C hollow nanospheres as the template. By simply adjusting the calcination temperature and time, three kinds of Fe₃O₄@[email protected]_X (MnO₂, Mn₃O₄ and MnO) hierarchical hollow nanospheres with different phase states of manganese oxides external layer are tailored. In virtue of the synergistic effect of Fe₃O₄ hollow nanostructures as supporters, the conductive carbon layer and MnO_X external layer, the three hollow nanocomposites exhibit excellent lithium storage properties. At 0.1Ag^-1, Fe₃O₄@[email protected]₂, Fe₃O₄@[email protected]₃O₄ and Fe₃O₄@[email protected] hierarchical hollow nanospheres still have specific capacities of 708, 833 and 670mAhg⁻¹ after 150 cycles, respectively. Even at 0.5Ag^-1, the reversible capacity of the three hollow nanocomposites remains 609, 780 and 523mAhg⁻¹ after 500 cycles, respectively. Interestingly, Fe₃O₄@[email protected]₃O₄ hierarchical hollow nanospheres possess more outstanding Li storage properties than Fe₃O₄@[email protected]₂ and Fe₃O₄@[email protected] hierarchical hollow nanospheres because the former have more stable Mn₃O₄ external layer during intensive cycles. The rational design of the phase state for Fe₃O₄@[email protected]_X (MnO₂, Mn₃O₄ and MnO) hierarchical hollow nanospheres can provide a novel synthetic strategy for energy storage nanomaterials with optimized performances.

我们以Fe ₃ O ₄ @C空心纳米球为模板，开发了一种简便的方法来控制合成Fe ₃ O ₄ @ [受电子邮件保护] _X（MnO ₂，Mn ₃ O ₄和MnO）分层空心球。通过简单地调节煅烧温度和时间，就可以制备出具有不同相态的锰氧化物外层的三种Fe ₃ O ₄ @（电子邮件保护的）_X（MnO ₂，Mn ₃ O ₄和MnO）分层中空纳米球。由于Fe ₃的协同作用作为载体的O ₄空心纳米结构，导电碳层和MnO _X外层，这三种空心纳米复合材料均具有优异的锂储存性能。在0.1Ag ^-1时，Fe ₃ O ₄ @ [受电子邮件保护] ₂，Fe ₃ O ₄ @ [受电子邮件保护] ₃ O ₄和Fe ₃ O ₄ @ [受电子邮件保护]分层中空纳米球的比容量仍为708、833 150次循环后分别为670mAhg ^-1和670mAhg ^-1。即使在0.5Ag ^-1三种中空纳米复合材料的可逆容量在500次循环后分别保持609、780和523mAhg ^-1。有趣的是，Fe ₃ O ₄ @ [受电子邮件保护的] ₃ O ₄分层中空纳米球比Fe ₃ O ₄ @ [受电子邮件保护的] ₂和Fe ₃ O ₄ @ [受电子邮件保护]分层中空纳米球具有更出色的锂存储性能。在密集循环中具有更稳定的Mn ₃ O ₄外层。Fe ₃ O ₄ @ [受电子邮件保护]的相态的合理设计_X（MnO ₂，Mn ₃ O ₄和MnO）分层空心纳米球可以为具有优化性能的储能纳米材料提供一种新颖的合成策略。