Crosslinked Polyimide and Reduced Graphene Oxide Composites as Long Cycle Life Positive Electrode for Lithium-Ion Cells.
Crosslinked Polyimide and Reduced Graphene Oxide Composites as Long Cycle Life Positive Electrode for Lithium-Ion Cells.
复制标题
DOI：
10.1002/cssc.202001389
复制
发表时间：
2020-10-21
期刊：
影响因子：
8.4
通讯作者：
Cooper AI
中科院分区：
文献类型：
--
作者：
Gao H;Tian B;Yang H;Neale AR;Little MA;Sprick RS;Hardwick LJ;Cooper AI
具有电化学活性氧化还原基团的共轭聚合物是一类很有前途的锂离子电池正极材料。然而，大多数聚合物（例如聚酰亚胺）具有较低的本征电导率，这导致充电循环过程中氧化还原活性位点的利用率较低，从而导致电化学性能较差。研究表明，可以通过原位缩聚反应合成具有还原氧化石墨烯（rGO）的聚酰亚胺复合材料（PIX）来克服这一限制。聚酰亚胺复合材料表现出更高的电荷转移性能和更大的比容量，其中含有 50 wt % rGO 的 PI50 在 500mA g−1 时显示出最大比容量 172 mAh g−1。这对应于活性聚酰亚胺中氧化还原活性位点的高利用率（86 %），并且该复合材料在 2000 mA g−1 下循环 9000 次后保留了其初始容量（125 mAh g−1）的 80 %。 长寿和繁荣：合成了还原氧化石墨烯和具有电化学氧化还原活性基团的三维聚酰亚胺的复合材料，并将其用作锂离子电池的正极。与聚酰亚胺本身相比，该复合材料表现出更高的比容量（125 mAh g−1、2000 mA g−1）和更长的循环寿命（9000次循环后保持率为80 %）。
Conjugated polymers with electrochemically active redox groups are a promising class of positive electrode material for lithium‐ion batteries. However, most polymers, such as polyimides, possess low intrinsic conductivity, which results in low utilization of redox‐active sites during charge cycling and, consequently, poor electrochemical performance. Here, it was shown that this limitation can be overcome by synthesizing polyimide composites (PIX) with reduced graphene oxide (rGO) using an in situ polycondensation reaction. The polyimide composites showed increased charge‐transfer performance and much larger specific capacities, with PI50, which contains 50 wt % of rGO, showing the largest specific capacity of 172 mAh g−1 at 500 mA g−1. This corresponds to a high utilization of the redox active sites in the active polyimide (86 %), and this composite retained 80 % of its initial capacity (125 mAh g−1) after 9000 cycles at 2000 mA g−1. Live long and prosper: Composites of reduced graphene oxide and a three‐dimensional polyimide with electrochemical redox active groups are synthesized and used as positive electrodes in lithium‐ion batteries. The composites show higher specific capacity (125 mAh g−1, 2000 mA g−1) and longer cycling life (80 % retention after 9000 cycles) than the polyimide on its own.
登录
查看更多内容
DOI：
10.1073/pnas.1717892115
发表时间：
2018-02-27
影响因子：
11.1
作者：
Luo, Chao;Borodin, Oleg;Wang, Chunsheng
通讯作者：
Wang, Chunsheng
聚酰亚胺：有前途的储能材料
影响因子：
16.6
作者：
Song, Zhiping;Zhan, Hui;Zhou, Yunhong
通讯作者：
Zhou, Yunhong
高能锂电池共轭羰基化合物电极的功能导向设计
影响因子：
8.4
作者：
Liang, Yanliang;Zhang, Peng;Chen, Jun
通讯作者：
Chen, Jun
影响因子：
24.2
作者：
Nitta, Naoki;Wu, Feixiang;Yushin, Gleb
通讯作者：
Yushin, Gleb
影响因子：
29.4
作者：
Luo, Chao;Ji, Xiao;Wang, Chunsheng
通讯作者：
Wang, Chunsheng