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Regulated Electrodeposition of Na Metal in Monolithic ZIF-Pillared Graphene Anodes
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-12-20 , DOI: 10.1021/acsami.1c21841 Qiya He 1, 2 , Xin Jin 3 , Zhonghua Li 3 , Ziqiang Cai 3 , Jiaming Tian 3 , Junfeng Hui 1 , Huigang Zhang 1, 2, 3
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-12-20 , DOI: 10.1021/acsami.1c21841 Qiya He 1, 2 , Xin Jin 3 , Zhonghua Li 3 , Ziqiang Cai 3 , Jiaming Tian 3 , Junfeng Hui 1 , Huigang Zhang 1, 2, 3
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Sodium (Na) metal batteries receive increasing attention because of their high energy densities and low costs that are enabled by the abundant Na resources. However, dendritic growth and low efficiency of Na-metal anodes limit the practical applications of Na-metal batteries. Here, we propose a three-dimensionally pillared structure in which carbonized nanoparticles of zeolite imidazolate framework-8 (ZIF-8) are sandwiched between reduced graphene oxide (rGO) sheets (ZIF-8-C@rGO). Such a pillared structure enables two advantages over rGO. First, the sodiation products of ZIF-8 (NaZn13, Na2O, and N-doped carbon) have a strong chemical affinity to Na metal, thereby inducing favorable nucleation of Na metal to guide Na deposition. Second, the pillared structure could facilitate the diffusion of Na ions through rGO sheets and help homogenize the current distribution, leading to a uniform deposition of Na metal. As a result, ZIF-8-C@rGO exhibits a dendrite-free morphology during Na plating/stripping and excellent cycling stability with high Coulombic efficiency of over 99.8% for at least 2000 h. A symmetric cell could maintain more than 4000 h with a stable average overpotential of only 30 mV at a capacity of 1 mA h cm–2. This work demonstrates that the design of a ZIF-pillared structure could combine thermodynamic and kinetic regulating factors to offer an alternative solution to the development of durable Na electrodes for high-performance Na-metal batteries.
中文翻译：
金属钠在单片 ZIF 柱状石墨烯阳极中的调控电沉积
钠（Na）金属电池因其丰富的钠资源而具有高能量密度和低成本而受到越来越多的关注。然而，金属钠负极的枝晶生长和低效率限制了金属钠电池的实际应用。在这里，我们提出了一种三维柱状结构，其中沸石咪唑酸盐骨架 8 (ZIF-8) 的碳化纳米颗粒夹在还原氧化石墨烯 (rGO) 片 (ZIF-8-C@rGO) 之间。这种柱状结构与 rGO 相比具有两个优势。一、ZIF-8的钠化产物（NaZn 13 , Na 2O 和 N 掺杂碳）对金属钠具有很强的化学亲和力，从而诱导钠金属的有利成核以引导钠沉积。其次，柱状结构可以促进钠离子通过 rGO 片材的扩散，并有助于使电流分布均匀，从而导致金属钠的均匀沉积。因此，ZIF-8-C@rGO 在 Na 电镀/剥离过程中表现出无枝晶形态，并具有出色的循环稳定性，在至少 2000 小时内具有超过 99.8% 的高库仑效率。在容量为 1 mA h cm –2的情况下，对称电池可以保持超过 4000 h，稳定的平均过电势仅为 30 mV. 这项工作表明，ZIF 柱结构的设计可以结合热力学和动力学调节因素，为开发用于高性能钠金属电池的耐用钠电极提供替代解决方案。
更新日期：2022-01-12
中文翻译：
金属钠在单片 ZIF 柱状石墨烯阳极中的调控电沉积
钠（Na）金属电池因其丰富的钠资源而具有高能量密度和低成本而受到越来越多的关注。然而，金属钠负极的枝晶生长和低效率限制了金属钠电池的实际应用。在这里，我们提出了一种三维柱状结构，其中沸石咪唑酸盐骨架 8 (ZIF-8) 的碳化纳米颗粒夹在还原氧化石墨烯 (rGO) 片 (ZIF-8-C@rGO) 之间。这种柱状结构与 rGO 相比具有两个优势。一、ZIF-8的钠化产物（NaZn 13 , Na 2O 和 N 掺杂碳）对金属钠具有很强的化学亲和力，从而诱导钠金属的有利成核以引导钠沉积。其次，柱状结构可以促进钠离子通过 rGO 片材的扩散，并有助于使电流分布均匀，从而导致金属钠的均匀沉积。因此，ZIF-8-C@rGO 在 Na 电镀/剥离过程中表现出无枝晶形态，并具有出色的循环稳定性，在至少 2000 小时内具有超过 99.8% 的高库仑效率。在容量为 1 mA h cm –2的情况下，对称电池可以保持超过 4000 h，稳定的平均过电势仅为 30 mV. 这项工作表明，ZIF 柱结构的设计可以结合热力学和动力学调节因素，为开发用于高性能钠金属电池的耐用钠电极提供替代解决方案。
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