Lithium-rich oxide material has been considered as an attractive candidate for high-energy cathode for lithium-ion batteries (LIBs). However, the practical applications are still hindered due to its low initial reversible capacity, severe voltage decaying, and unsatisfactory rate capability. Among all, the voltage decaying is a serious barrier that results in a large decrease of energy density during long-term cycling. To overcome these issues, herein, an efficient strategy of fabricating lithium-rich oxide nanowires with spinel/layered heterostructure is proposed. Structural characterizations verify that the spinel/layered heterostructured nanowires are a self-assembly of a lot of nanoparticles, and the Li₄Mn₅O₁₂ spinel phase is embedded inside the layered structure. When the material is used as cathode of LIBs, the spinel/layered heterostructured nanowires can display an extremely high invertible capacity of 290.1 mA h g^–1 at 0.1 C and suppressive voltage fading. Moreover, it exhibits a favorable cycling stability with capacity retention of 94.4% after charging/discharging at 0.5 C for 200 cycles and it shows an extraordinary rate capability (183.9 mA h g^–1, 10 C). The remarkable electrochemical properties can be connected with the spinel/layered heterostructure, which is in favor of Li⁺ transport kinetics and enhancing structural stability during the cyclic process.

中文翻译：

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尖晶石/层状异结构富锂氧化物纳米线作为高能锂离子电池的阴极材料

富锂氧化物材料被认为是锂离子电池（LIB）高能阴极的有吸引力的候选材料。然而，由于其低的初始可逆容量，严重的电压衰减和不令人满意的速率能力，实际应用仍然受到阻碍。其中，电压衰减是一个严重的障碍，会导致长期循环过程中能量密度大大降低。为了克服这些问题，在本文中，提出了一种制造具有尖晶石/层状异质结构的富锂氧化物纳米线的有效策略。结构表征验证了尖晶石/层状异质结构纳米线是许多纳米粒子和Li ₄ Mn ₅ O ₁₂的自组装体尖晶石相嵌入层状结构内部。当该材料用作LIB的阴极时，尖晶石/层状异质结构纳米线在0.1 C时可表现出290.1 mA hg ^–1的极高可逆容量，并且抑制电压衰减。此外，它表现出与94.4％的容量维持良好的循环稳定性充电/ 0.5下200个循环放电后，它显示了惊人的速度能力（183.9毫安汞柱^-1，10℃）。出色的电化学性能可以与尖晶石/层状异质结构联系在一起，这有利于Li ⁺传输动力学并增强循环过程中的结构稳定性。