High‐Performance Sodium Ion Batteries Based on a 3D Anode from Nitrogen‐Doped Graphene Foams

A 3D N-doped graphene foam with a 6.8 at% nitrogen content is prepared by annealing a freeze-dried graphene oxide foam in ammonia. It is used as an anode in sodium ion batteries to deliver a high initial reversible capacity of 852.6 mA h g-1 at 1 C between 0.02 and 3 V with a long-term retention of 69.7% after 150 cycles. Over the past several decades, lithium ion batteries (LIBs) have been successfully used as the rechargeable energy source of choice in various portable and smart devices (e.g., personal computers, cell phones, cameras, MP3 players) because of their high energy density and long lifetime.1 A continuously growing demand for them in large-scale applications, such as electric vehicles (EVs) and…

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  Air Force Office of Scientific Research