Jahnke Timotheus, Raafat Leila, Hotz Daniel, Knöller Andrea, Diem Achim Max, Bill Joachim, Burghard Zaklina
Max Planck Institute for Medical Research, 61920 Heidelberg, Germany.
Institute for Materials Science, University of Stuttgart, 70569 Stuttgart, Germany.
Nanomaterials (Basel). 2020 Oct 14;10(10):2024. doi: 10.3390/nano10102024.
Establishing energy storage systems beyond conventional lithium ion batteries requires the development of novel types of electrode materials. Such materials should be capable of accommodating ion species other than Li, and ideally, these ion species should be of multivalent nature, such as Al. Along this line, we introduce a highly porous aerogel cathode composed of reduced graphene oxide, which is loaded with nanostructured SnO. This binder-free hybrid not only exhibits an outstanding mechanical performance, but also unites the pseudocapacity of the reduced graphene oxide and the electrochemical storage capacity of the SnO nanoplatelets. Moreover, the combination of both materials gives rise to additional intercalation sites at their interface, further contributing to the total capacity of up to 16 mAh cm at a charging rate of 2 C. The high porosity (99.9%) of the hybrid and the synergy of its components yield a cathode material for high-rate (up to 20 C) aluminum ion batteries, which exhibit an excellent cycling stability over 10,000 tested cycles. The electrode design proposed here has a great potential to meet future energy and power density demands for advanced energy storage devices.
开发超越传统锂离子电池的储能系统需要研发新型电极材料。这类材料应能够容纳除锂之外的离子种类，理想情况下，这些离子种类应具有多价性质，比如铝离子。沿着这条思路，我们引入了一种由还原氧化石墨烯构成的高孔隙率气凝胶阴极，其中负载了纳米结构的二氧化锡。这种无粘结剂的复合材料不仅表现出出色的机械性能，还兼具还原氧化石墨烯的赝电容和二氧化锡纳米片的电化学存储容量。此外，两种材料的结合在其界面处产生了额外的嵌入位点，在2C充电速率下，总容量可达16 mAh cm 。该复合材料的高孔隙率（99.9%）及其组分间的协同作用产生了一种适用于高倍率（高达20C）铝离子电池的阴极材料，在10000次测试循环中表现出优异的循环稳定性。这里提出的电极设计在满足未来先进储能设备的能量和功率密度需求方面具有巨大潜力。
