As a promising cathode material in sodium-ion batteries (SIBs) for large-scale energy storage applications, tunnel-structured Na_0.44MnO₂ is prepared by a facile and controllable urea-based solution combustion synthesis (SCS) method with subsequent calcination. The phase purity, morphology, homogeneity and particle size of the samples are quite dependent on the SCS fuel condition. The optimal sample f0.75 displays pure phase composition, high crystallinity and hierarchical-structured particles with uniform size of several microns, which are the agglomerates of well-calcined nano-rods and nano-slabs. The sample exhibits the highest reversible capacity of around 117 mAh/g at 0.1 C, good rate capability and excellent cycling stability, which even presents a high capacity of 100 mAh/g at 4 C after 300 cycles. The facile and controllable production and the superior electrochemical performance of the Na_0.44MnO₂ makes it a promising cathode material for the development of practical SIBs.

隧道结构的Na _0.44 MnO ₂作为用于大规模储能应用的钠离子电池（SIB）中极有希望的阴极材料通过简便且可控制的基于尿素的固溶燃烧合成（SCS）方法以及随后的煅烧来制备氯乙烯。样品的相纯度，形态，均质性和颗粒大小完全取决于SCS燃料条件。最佳样品f0.75显示出纯相组成，高结晶度和具有几微米均匀大小的分层结构的颗粒，这些颗粒是经过良好煅烧的纳米棒和纳米平板的聚集体。该样品在0.1 C时表现出最高的可逆容量，约为117 mAh / g，具有良好的倍率性能和出色的循环稳定性，甚至在300次循环后在4 C时也具有100 mAh / g的高容量。Na _0.44 MnO ₂的简便可控生产和优异的电化学性能 使其成为开发实用SIB的有希望的阴极材料。