Guiding lithium deposition in tent-like nitrogen-doped porous carbon microcavities for stable lithium metal anodes,Journal of Materials Chemistry A

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Guiding lithium deposition in tent-like nitrogen-doped porous carbon microcavities for stable lithium metal anodes
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-06-22 , DOI: 10.1039/d0ta04784h
He Gan _{1,

2,

3,

4} , Jing Wu _{1,

2,

3,

4} , Hui Chen _{1,

2,

3,

4,

5} , Run Li _{1,

2,

3,

4,

5} , Hongbo Liu _{1,

2,

3,

4,

5}

Affiliation

Lithium metal anodes, acting as a competitive candidate for the construction of high-energy-density rechargeable batteries, have drawn tremendous attention in both academia and industry. However, the uncontrollable growth of lithium dendrites and dramatic volume changes during lithium plating/stripping prevent their practical application. In this work, we demonstrate tent-like nitrogen-doped porous carbon microcavities decorated on carbon cloth (NPCM@CC) which could guide the Li ion flux, reduce the nucleation overpotential and decrease local current density, thus regulating the nucleation and growth behavior of metallic lithium. Consequently, the assembled cells based on NPCM@CC display remarkable electrochemical performances as reflected by an extremely high coulombic efficiency (99.1% at 4 mA h cm⁻²), excellent long-term cycling stability (over 4200 and 1200 h at 1 and 2 mA cm⁻², respectively), and an ultralow overpotential value of 46 mV at a current density up to 10 mA cm⁻².

中文翻译：

指导在类似帐篷的氮掺杂多孔碳微腔中沉积锂，以稳定锂金属阳极

金属锂阳极在构造高能量密度可充电电池方面具有竞争优势，在学术界和工业界都引起了极大的关注。然而，锂枝晶的不可控制的生长和锂电镀/剥离过程中体积的急剧变化阻止了它们的实际应用。在这项工作中，我们演示了在碳布（NPCM @ CC）上装饰的帐篷状氮掺杂多孔碳微腔，它可以引导Li离子通量，减少成核的超电势并降低局部电流密度，从而调节碳纳米管的成核和生长行为。金属锂。因此，基于NPCM @ CC的组装电池显示出卓越的电化学性能，这体现在极高的库仑效率（4 mA h cm ^-2时为99.1％）），出色的长期循环稳定性（分别在1和2 mA cm ^-2时超过4200和1200 h ），以及在高达10 mA cm ^-2的电流密度下46 mV的超低过电势值。

更新日期：2020-07-14

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