Self-Adhesive Polyimide (PI)@Reduced Graphene Oxide (RGO)/PI@Carbon Nanotube (CNT) Hierarchically Porous Electrodes: Maximizing the Utilization of Electroactive Materials for Organic Li-Ion Batteries
Self-Adhesive Polyimide (PI)@Reduced Graphene Oxide (RGO)/PI@Carbon Nanotube (CNT) Hierarchically Porous Electrodes: Maximizing the Utilization of Electroactive Materials for Organic Li-Ion Batteries
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自粘式聚酰亚胺（PI）@还原氧化石墨烯（RGO）/PI@碳纳米管（CNT）分级多孔电极：最大限度地利用有机锂离子电池电活性材料
DOI：
10.1002/ente.202000397
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发表时间：
2020
影响因子：
3.8
通讯作者：
Hou Haoqing
中科院分区：
文献类型：
--
作者：
Liu Shuwu;Yang Haoqi;Sui Ling;Jiang Shaohua;Hou Haoqing
尽管有机羰基聚合物已成功用作锂离子电池（LIB）的电极，但由于其活性材料利用率低、电子导电性差和绝缘粘合剂，其工作容量和能量密度仍然受到限制。在这项贡献中，通过原位聚合将由还原氧化石墨烯（RGO）和碳纳米管（CNT）组成的高效导电网络引入聚酰亚胺（PI）中。得益于PI前驱体的特性粘度，无需任何绝缘粘合剂，通过酰亚胺化和热处理即可获得自粘式PI@RGO/PI@CNT电极。结构表征表明，PI均匀生长在RGO层上，并与CNT连接形成导电网络，这意味着少量的碳可以大大提高电导率。正如预期的那样，PI@RGO/PI@CNT电极在0.1 A g−1时具有1291 mAh g−1的高初始容量，在5 A g−1时具有212 mAh g−1的超高倍率性能，以及在10 A g−1时容量保持率为96%的稳定循环性能。与报道的PI基电极相比，PI@RGO/PI@CNTs电极可以实现活性材料的超高利用率。这项工作提出了一种提高PI利用率的有效方法，并为电极结构设计和制备工艺提供了指导。
Although organic carbonyl polymers have been successfully used as electrodes for lithium‐ion batteries (LIBs), the operational capacity and energy density are still restricted due to their low utilization of active materials, poor electronic conductivity, and insulated binders. In this contribution, an efficient conductive network composed of reduced graphene oxide (RGO) and carbon nanotubes (CNTs) is introduced into polyimide (PI) via in‐situ polymerization. Benefitting from the intrinsic viscosity of PI precursor, the self‐adhesive PI@RGO/PI@CNT electrode can be obtained through imidization and thermal treatment without any insulated binders. Structural characterization reveals that PI uniformly grows on the RGO layer and connects with CNTs to form conductive networks, implying that a small amount of carbons can greatly improve the conductivity. As expected, the PI@RGO/PI@CNT electrode delivers a high initial capacity of 1291 mAh g−1at 0.1 A g−1, an ultrahigh‐rate performance of 212 mAh g−1at 5 A g−1, and a stable cyclability with capacity retention of 96% at 10 A g−1. Compared with reported PI‐based electrodes, the PI@RGO/PI@CNTs electrode could achieve a superhigh utilization of active materials. This work proposes an effective method to improve the utilization of PI and provides a guideline on the electrode structural design and preparation process.