Ultrathin MnO2 nanoflakes grown on N-doped hollow carbon spheres for high-performance aqueous zinc ion batteries,Materials Chemistry Frontiers

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Ultrathin MnO2 nanoflakes grown on N-doped hollow carbon spheres for high-performance aqueous zinc ion batteries
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2019-11-18 , DOI: 10.1039/c9qm00675c
Linlin Chen _{1,

2,

3,

4,

5} , Zhanhong Yang _{1,

2,

3,

4,

5} , Fan Cui _{1,

2,

3,

4,

5} , Jinlei Meng _{1,

2,

3,

4,

5} , Yinan Jiang _{1,

2,

3,

4,

5} , Jun Long _{1,

2,

3,

4,

5} , Xiao Zeng _{1,

2,

3,

4,

5}

Affiliation

The use of MnO₂ as a promising cathode material for aqueous zinc ion batteries (AZIBs) remains challenging, because its inherent poor electrical conductivity and huge volume changes lead to a fast capacity decay, short cycle life, and sluggish electrode kinetics. In this study, ultrathin MnO₂ nanoflakes grown on N-doped hollow carbon spheres (defined as MnO₂–NHCSs) were prepared via a simple solution-phase route and subsequent hydrothermal process, and then evaluated for their potential as a cathode for AZIBs. Ultrathin MnO₂ nanoflakes decorated on NHCSs endow the overall electrode with abundant exposed active sites and excellent electrical conductivity, which could buffer the volumetric expansion and facilitate the charge-transfer kinetics. Owing to these favorable structural characteristics, the as-synthesized MnO₂–NHCS composite can display a high discharge capacity of 349 mA h g⁻¹ at 0.1 A g⁻¹ after 80 cycles. Significantly, ultra-stable long-term cycling performance of 100 mA h g⁻¹ with a superior capacity retention of 78.7% is achieved after 2000 cycles at 2.0 A g⁻¹. Such notable electrochemical properties of MnO₂–NHCSs are demonstrated to be superior to that of pure MnO₂ hollow spheres (MnO₂-HSs) and other previously reported manganese-based oxide cathodes, which is promising for practical applications.

中文翻译：

在N掺杂空心碳球上生长的超薄MnO2纳米薄片，用于高性能水性锌离子电池

MnO ₂用作水性锌离子电池（AZIBs）的有希望的阴极材料仍然具有挑战性，因为其固有的差的电导率和巨大的体积变化会导致快速的容量衰减，短的循环寿命和缓慢的电极动力学。在这项研究中，通过简单的固溶相途径和随后的水热过程，制备了在N掺杂空心碳球（定义为MnO ₂ -NHCSs）上生长的超薄MnO ₂纳米薄片，然后评估了它们作为AZIBs阴极的潜力。超薄MnO ₂在NHCS上装饰的纳米薄片使整个电极具有丰富的暴露活性位点和出色的电导率，这可以缓冲体积膨胀并促进电荷转移动力学。由于具有这些有利的结构特性，刚合成的MnO ₂ -NHCS复合材料在80次循环后，在0.1 A g ^-1下可表现出349 mA hg ^-1的高放电容量。值得注意的是，在2.0 A g ^-1下经过2000次循环后，可实现100 mA hg ^-1的超稳定长期循环性能，并具有78.7％的出色容量保持率。事实证明，MnO ₂ -NHCSs的这种显着电化学性能优于纯MnO _2的电化学性能。空心球（MnO ₂ -HSs）和其他先前报道的锰基氧化物阴极，对于实际应用是有前途的。

更新日期：2019-11-18

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