Mesoporous single-crystalline MnOx nanofibers@graphene for ultra-high rate and long-life lithium-ion battery anodes†,Journal of Materials Chemistry A

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Mesoporous single-crystalline MnOx nanofibers@graphene for ultra-high rate and long-life lithium-ion battery anodes†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2018-11-06 00:00:00 , DOI: 10.1039/c8ta09394f
Chenglong Xu _{1,

2,

3,

4,

5} , Zheng Liu _{1,

2,

3,

4,

5} , Tong Wei _{1,

2,

3,

4,

5} , Lizhi Sheng _{1,

2,

3,

4,

5} , Longhai Zhang _{1,

2,

3,

4,

5} , Lan Chen _{1,

2,

3,

4,

5} , Qihang Zhou _{1,

2,

3,

4,

5} , Zimu Jiang _{1,

2,

3,

4,

5} , Lin Wang _{6,

7,

8,

9} , Zhuangjun Fan _{1,

2,

3,

4,

5}

Affiliation

With the increasing energy demand of electronic devices and electric vehicles, the achievement of anode materials for lithium-ion batteries with high specific capacity and superior rate capability and cycling stability still remains a challenge. Herein, we report a novel strategy to prepare the core–shell mesoporous single-crystalline MnO_x nanofibers@graphene (PSCMnO_x@G) through a “spraying–rapid freezing” process. The elastic graphene shell not only improves the conductivity of the electrode but can also substantially inhibit the collapse of MnO_x nanofibers (NFs) over continuous discharge–charge cycles. Moreover, the double-exchange interaction of manganese mixed-valence ions further improves the conductivity of manganese oxide, and Li ion diffusion is significantly enhanced by the vertically aligned single-crystalline and mesoporous structure of MnO_x NFs. As a result, the PSCMnO_x@G exhibits an ultrahigh rate performance (1072 mA h g⁻¹ at 0.1 A g⁻¹ and 419 mA h g⁻¹ at 10 A g⁻¹), which is among the best ever reported for MnO_x based anodes, as well as excellent cycling stability (1162 mA h g⁻¹ at 2 A g⁻¹ over 500 cycles).

中文翻译：

介孔单晶MnO _x纳米纤维@石墨烯，用于超高速率和长寿命的锂离子电池阳极†

随着电子设备和电动汽车对能量的需求不断增长，具有高比容量，优异的倍率性能和循环稳定性的锂离子电池负极材料的实现仍然是一个挑战。本文中，我们报告了一种通过“喷雾-快速冷冻”工艺制备核-壳介孔单晶MnO _x纳米纤维@石墨烯（PSCMnO _x @G）的新颖策略。弹性石墨烯壳不仅可以改善电极的导电性，还可以基本上抑制MnO _x的塌陷连续放电-充电循环中的纳米纤维（NFs）。而且，锰混合价离子的双交换相互作用进一步提高了锰氧化物的电导率，并且通过MnO _x NFs的垂直排列单晶和介孔结构显着增强了Li离子的扩散。其结果是，该PSCMnO _X @G展品的超高倍率性能（1072毫安汞柱^-1在0.1 A克^-1和419毫安汞柱^-1以10 A G ^-1），这是以往中报道的MnO最好_X阳极，以及出色的循环稳定性（在500个循环中，在2 A g ^-1下为1162 mA hg ^-1）。

更新日期：2018-11-06

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