文献类型：期刊文献

英文题名：Abnormal-stoichiometric KxCl crystal decoration: A new strategy to improve K-Ion storage performance of graphene paper

作者：Zhan, Jing[1];Lei, Zhendong[1,2];Liu, Xing[3];Yang, Mengjia[3];Li, Minyue[3];Fang, Haiping[4];Zhang, Yong[1,2];Wang, Yong[3];Shi, Guosheng[3]

机构：[1]Natl Univ Singapore, Dept Biomed Engn, Fac Engn, Singapore 117583, Singapore;[2]Natl Univ Singapore, NUS Grad Sch Integrat Sci & Engn, Singapore 117456, Singapore;[3]Shanghai Univ, Sch Environm & Chem Engn, 99 Shangda Rd, Shanghai 200444, Peoples R China;[4]East China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China

年份：2022

卷号：192

起止页码：93

外文期刊名：CARBON

收录：;EI(收录号：20220911720294);WOS:【SCI-EXPANDED(收录号:WOS:000783471100009)】；

语种：英文

外文关键词：Abnormal-stoichiometric; KxCl; Graphene; Cation-pi; K-ions storage

摘要：Carbonaceous materials are the most attractive choices for rechargeable potassium ion batteries (PIBs), but many K-ion batteries exhibit low specific capacity, limited cycling stability, and disappointed rate capability for the poor K-ions intercalation performance. Here, we chose graphene paper as the research object, fabricated a freestanding K-Cl-graphene paper electrode with abnormal-stoichiometric KxCl crystals (KxCl-rGO), and proposed a novel universal design strategy by using this electrode to achieve a high-efficiency K-graphene battery. Compared with pure rGO, KxCl-rGO displays a high reversible capacity of 318 mAh g(-1) at 20 mA g(1) (38.9% higher than rGO) and can retain a reversible capacity of 157 mAh g(1) at 100 mA g(1) after 500 cycles. The increased K-ion diffusion and enhanced electrical conductivity (the conductivity increased 83% than rGO) play a significant role in improving the potassium storage performance of KxCl-rGO. What's more, for graphene with more functional groups, this pretreatment improves the potassium storage performance of carbon materials more significantly (approximately doubled). (C) 2022 Elsevier Ltd. All rights reserved.