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High power lithium-ion battery based on a LiMn2O4 nanorod cathode and a carbon-coated Li4Ti5O12 nanowire anode

机译:基于LiMn2O4纳米棒阴极的高功率锂离子电池和碳涂层Li4Ti5O12纳米线阳极

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摘要

Lithium-ion batteries have been widely applied to power various devices because of their high energy density. However, their power performance is generally limited by the Li ~(+) diffusion in the bulk of electrode-active materials and is much lower than that of a supercapacitor. Herein, nano-structured cathode (spinel LiMn _(2) O _(4) nanorods) and anode materials (carbon-coated Li _(4) Ti _(5) O _(12) nanowires) are prepared by hydrothermal approaches with subsequent heat treatments or a chemical vapor deposition treatment. Electrochemical investigation demonstrates that the nano-size and one-dimensional structure of the prepared electrode materials can efficiently shorten Li ~(+) diffusion length and reduce interface impedance, and thus they exhibit much higher rate capability than that of the micro-sized LiMn _(2) O _(4) and Li _(4) Ti _(5) O _(12) . The LiMn _(2) O _(4) nanorods and carbon-coated Li _(4) Ti _(5) O _(12) nanowires were then used to build a full cell that exhibits supercapacitor-like power performance (a maximum power density of 6880 W kg ~(?1) ), long life (500 cycles with a capacity retention of 81%) and high energy density (a maximum energy density of 140 W h kg ~(?1) ).
机译:由于其高能量密度,锂离子电池已被广泛应用于各种器件。然而,它们的功率性能通常受到电极活性材料的大部分中的Li〜(+)扩散的限制,并且远低于超电容器的Li〜(+)扩散。这里,通过水热方法制备纳米结构阴极(尖晶石Limn _(2)O _(4)o o×(4)×(4)×(4)o_(12)纳米线)随后的热处理或化学气相沉积处理。电化学研究表明,制备的电极材料的纳米尺寸和一维结构可以有效地缩短Li〜(+)扩散长度并降低界面阻抗,因此它们表现出比微尺寸的跛行速率更高的速率能力_ (2)o _(4)和Li _(4)Ti _(5)O _(12)。然后使用LIMN _(2)O _(4)纳米棒和碳涂覆的Li _(4)Ti _(5)O _(12)α(12)纳米线来构建呈现出具有超级电容器样功率性能的全细胞(最大值功率密度为6880 W kg〜(α1)),长寿命(容量保持81%的500个循环)和高能量密度(最大能量密度为140wh kg〜(Δ1))。

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