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Rechargeable Aqueous Zinc–Manganese Dioxide/Graphene Batteries with High Rate Capability and Large Capacity
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-01-15 00:00:00 , DOI: 10.1021/acsaem.9b02220 Chunyan Wang 1 , Mingqiang Wang 1 , Zhichao He 1 , Li Liu 1 , Yudong Huang 1
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-01-15 00:00:00 , DOI: 10.1021/acsaem.9b02220 Chunyan Wang 1 , Mingqiang Wang 1 , Zhichao He 1 , Li Liu 1 , Yudong Huang 1
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Batteries based on Zn and other two-valent metals can be nearly ideal charge storage devices because of their high energy density combined with reliability, earth-abundance, and low flammability. Searching for high-performance positive electrodes with good rate capability and adequate cycle life is currently a hot topic and a great challenge for developing zinc batteries. Here, a binder-free 3D porous graphene aerogel-supported α-MnO2 cathode (G-MnO2) is synthesized via a facile and scalable hydrogel method. The hybrid cathode of α-MnO2 nanotube attached on highly conductive interconnected graphene frameworks enables rechargeable Zn/G-MnO2 batteries with a high capacity of 321 mAhg–1 at 0.2C (1C = 240 mAhg–1), good rate capability, and ultralong cycle life (91% capacity retention over 300 cycles at a high current rate 3C). These findings open the pathway to a large family of low-cost high-performance Zn-batteries and potentially other two-valent metals for a wide range of applications.
中文翻译：
具有高倍率能力和大容量的可再充电水性锌锌锰/石墨烯电池
基于锌和其他二价金属的电池可以成为近乎理想的电荷存储设备，因为它们的能量密度高，可靠性高，接地能力强且易燃。寻找具有良好的倍率能力和足够的循环寿命的高性能正电极，目前是热门话题，也是开发锌电池的巨大挑战。在此，无粘合剂的三维多孔石墨烯气凝胶支持的α-MnO的2阴极（G-的MnO 2）经由一个浅显的和可伸缩的水凝胶的方法合成。α-MnO的所述的混合阴极2纳米管附着在高导电性石墨烯互连框架使可再充电的Zn / G-的MnO 2个电池具有321 mAhg的高容量-1在0.2C（1C = 240 mAhg–1），良好的速率能力和超长的循环寿命（在高电流速率3C下300个循环中91％的容量保持率）。这些发现为大范围的低成本高性能Zn电池以及可能用于其他应用的其他二价金属开辟了道路。
更新日期：2020-01-15
中文翻译：
具有高倍率能力和大容量的可再充电水性锌锌锰/石墨烯电池
基于锌和其他二价金属的电池可以成为近乎理想的电荷存储设备，因为它们的能量密度高，可靠性高，接地能力强且易燃。寻找具有良好的倍率能力和足够的循环寿命的高性能正电极，目前是热门话题，也是开发锌电池的巨大挑战。在此，无粘合剂的三维多孔石墨烯气凝胶支持的α-MnO的2阴极（G-的MnO 2）经由一个浅显的和可伸缩的水凝胶的方法合成。α-MnO的所述的混合阴极2纳米管附着在高导电性石墨烯互连框架使可再充电的Zn / G-的MnO 2个电池具有321 mAhg的高容量-1在0.2C（1C = 240 mAhg–1），良好的速率能力和超长的循环寿命（在高电流速率3C下300个循环中91％的容量保持率）。这些发现为大范围的低成本高性能Zn电池以及可能用于其他应用的其他二价金属开辟了道路。
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