Qi Xiao, Mao Jian
College of Materials Science and Engineering, Sichuan University, Chengdu, Sichuan 610065, China.
J Phys Chem Lett. 2021 Jun 10;12(22):5430-5435. doi: 10.1021/acs.jpclett.1c01340. Epub 2021 Jun 3.
As an important indicator to evaluate battery performance, the energy density of commercial lithium ion batteries is close to the limit. Herein, for the first time, we reported that the reduced oxide graphene (rGO) aerogel can be directly used for the cathode of a dual-ion battery to achieve a superior specific energy density by reducing the dead weight of the battery. The porous structure of an rGO aerogel facilitates the penetration of the electrolyte and provides more active sites for energy storage. At the same time, the continuous graphene network benefits the electron transport. The lithium-rGO battery shows a discharge specific capacity of 94 mA h g at 1 A g and a superior specific energy density of 213 W h kg at 2141 W kg. It is worth noting that this current collector-free electrode design would promote the development and application of graphene-based batteries with a high energy density.
作为评估电池性能的一项重要指标，商用锂离子电池的能量密度已接近极限。在此，我们首次报道了还原氧化石墨烯（rGO）气凝胶可直接用于双离子电池的阴极，通过减轻电池的自重来实现卓越的比能量密度。rGO气凝胶的多孔结构有利于电解质的渗透，并为能量存储提供更多活性位点。同时，连续的石墨烯网络有利于电子传输。锂-rGO电池在1 A g电流密度下的放电比容量为94 mA h g，在2141 W kg功率密度下的比能量密度高达213 W h kg。值得注意的是，这种无集流体的电极设计将推动高能量密度石墨烯基电池的发展与应用。
