High-Level Pyrrolic/Pyridinic N-Doped Carbon Nanoflakes from pi-Fused Polyimide for Anodic Lithium Storage
High-Level Pyrrolic/Pyridinic N-Doped Carbon Nanoflakes from pi-Fused Polyimide for Anodic Lithium Storage
复制标题
用于阳极锂存储的来自 pi 熔融聚酰亚胺的高含量吡咯/吡啶 N 掺杂碳纳米片
DOI：
10.1002/slct.201701552
复制
发表时间：
2017
期刊：
影响因子：
2.1
通讯作者：
Huang Wei
中科院分区：
文献类型：
--
作者：
Zhu Caixia;Yang Bing;Zhang Yanni;Sheng Yongjian;Yin Chengrong;Du Zhuzhu;Zhao Jianfeng;Huang Wei
高氮掺杂碳材料在高性能锂离子电池（LIB）中作为阳极占据重要地位。在该贡献中，热解碳花被具有高吡咯/吡啶N掺杂含量（4.5/4.2 at.%）的纳米片覆盖。通过大π-稠合聚酰亚胺（所形成的碳被称为π-聚酰亚胺基碳，π-PC）或共轭中断的聚酰亚胺（所形成的碳被称为聚酰亚胺基碳，PC）的Ar保护热解制备。π-PC的总含量为14.6 wt.% N掺杂，而PC仅具有4.9重量% N型兴奋剂π-PC和PC已被表征为锂离子电池的阳极材料。在100 mA g-1下，π-PC电极的初始重复循环容量为796.9 mAh g-1，第11次循环容量为692.2 mAh g-1，分别比PC电极的533.5 mAh g-1和447.8 mAh g-1高出约1.5倍。 在200 mA g-1下循环188次后，π-PC电极的容量保持在712.7 mAh g-1。 在1.6 A g-1时，π-PC的容量为352.6 mAh g-1，是PC的196.4 mAh g-1的1.79倍。 这项工作突出表明，π-稠合聚酰亚胺可能是用于能源相关应用的高水平N-掺杂碳质材料的有用碳源。
Highly N‐doped carbon materials occupy an important position as anodes in high‐performance Li‐ion batteries (LIBs). In this contribution, pyrolysed carbon flowers covered by nanoflakes with highly pyrrolic/pyridinic N‐doping content (4.5/4.2 at.%) were prepared through the Ar‐protected pyrolyzation of large π‐fused polyimide (the as‐formed carbon named as π‐polyimide‐based carbon, π‐PC) or conjugation‐interrupted polyimide (the as‐resulted carbon named as polyimide‐based carbon,PC). π‐PCpossesses total 14.6 wt.% N‐doping whilePConly has 4.9 wt.% N‐doping. π‐PCandPChave been characterized as anodic materials in Li+ions batteries. At 100 mA g–1, the capacity of π‐PCelectrode kept at 796.9 mAh g–1by the initial repeatable cycle and maintained 692.2 mAh g–1by the 11thcycle, which were ∼1.5 times higher than the corresponding capacity value of 533.5 mAh g–1and 447.8 mAh g–1forPC. The capacity of π‐PCelectrode kept 712.7 mAh g–1after 188 cycles at 200 mA g–1. At 1.6 A g–1, the capacity of π‐PCwas 352.6 mAh g–1, which is 1.79 times larger than 196.4 mAh g–1ofPC. This work highlights that the π‐fused polyimide could be an useful carbon source for high‐level N‐doped carbonaceous materials for energy‐related applications.