Chang Bin, Ma Jian, Jiang Tiancai, Gao Li, Li Yuanting, Zhou Mingan, Huang Yanshan, Han Sheng
School of Chemical and Environmental Engineering, Shanghai Institute of Technology Haiquan Road 100 Shanghai 201418 PR China
School of Physics and Technology, Center for Nanoscience and Nanotechnology, Wuhan University Wuhan 430072 Hubei PR China.
RSC Adv. 2020 Feb 28;10(15):8729-8734. doi: 10.1039/d0ra00884b. eCollection 2020 Feb 27.
Organic carbonyl polymers have been gradually used as the cathode in lithium-ion batteries (LIB). However, there are some limits in most organic polymers, such as low reversible capacity, poor rate performance, cycle instability, , due to low electrochemical conductivity. To mitigate the limits, we propose a strategy based on polyimide (PI)/graphene electroactive materials coated with reduced graphene oxide to prepare a flexible film (G@PI/RGO) by solvothermal and vacuum filtration processes. As a flexible cathode for LIB, it provides a reversible capacity of 198 mA h g at 30 mA g and excellent rate performance of 100 mA h g at high current densities of 6000 mA g, and even a super long cycle performance (2500 cycles, 70% capacity retention). The excellent performance results in a special layer structure in which the electroactive PI was anchored and coated by the graphene. The present synthetic method can be further applied to construct other high-performance organic electrodes in energy storage.
有机羰基聚合物已逐渐被用作锂离子电池（LIB）的阴极。然而，大多数有机聚合物存在一些局限性，例如可逆容量低、倍率性能差、循环稳定性差，这是由于其电化学导电性低所致。为了缓解这些局限性，我们提出了一种基于聚酰亚胺（PI）/石墨烯电活性材料的策略，该材料涂覆有还原氧化石墨烯，通过溶剂热和真空过滤工艺制备柔性薄膜（G@PI/RGO）。作为LIB的柔性阴极，它在30 mA g时提供198 mA h g的可逆容量，在6000 mA g的高电流密度下具有100 mA h g的优异倍率性能，甚至具有超长的循环性能（2500次循环，容量保持率70%）。优异的性能源于一种特殊的层状结构，其中电活性PI被石墨烯锚定并包覆。目前的合成方法可进一步应用于构建储能领域的其他高性能有机电极。
