{"title":"Soft-carbon-tuned hard carbon anode for ultrahigh-rate sodium storage","authors":"Hongjin Dai, Yufang Cao and Jingyu Sun","doi":"10.1088/2053-1583/ad77e1","DOIUrl":null,"url":null,"abstract":"High-rate hard carbon anode is critical for achieving fast-charging sodium-ion batteries, whereas the limited ion/electron kinetics caused by unexpected surface defects and unsatisfactory conductivity greatly limits rate capability. Herein, a coconut shell-derived soft-carbon-tuned hard carbon (SHC) with low surface area (4.7 m2 g−1) was prepared. With SHCs as bricks, a high conductivity single-walled carbon nanotube (SWNT)-bonded hard carbon film was constructed. The pitch-derived soft carbon formed on SHCs can effectively decrease the surface defects and simultaneously induce optimized disordered graphite domains into carbon matrix, enabling high Na+ reversibility and ionic/electronic conductivity. The crosslinked SWNTs in-between can provide continuous ion/charge transport ‘highways’, thus ensuring rapid ion/electron kinetics. As a result, such a self-supporting carbon anode exhibits remarkable rate performance (330 mAh g−1 at 0.1 C and 272 mAh g−1 at 5 C), superior initial Coulombic efficiency of 95.2% and outstanding cycling stability.","PeriodicalId":6812,"journal":{"name":"2D Materials","volume":null,"pages":null},"PeriodicalIF":4.5000,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2D Materials","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1088/2053-1583/ad77e1","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
High-rate hard carbon anode is critical for achieving fast-charging sodium-ion batteries, whereas the limited ion/electron kinetics caused by unexpected surface defects and unsatisfactory conductivity greatly limits rate capability. Herein, a coconut shell-derived soft-carbon-tuned hard carbon (SHC) with low surface area (4.7 m2 g−1) was prepared. With SHCs as bricks, a high conductivity single-walled carbon nanotube (SWNT)-bonded hard carbon film was constructed. The pitch-derived soft carbon formed on SHCs can effectively decrease the surface defects and simultaneously induce optimized disordered graphite domains into carbon matrix, enabling high Na+ reversibility and ionic/electronic conductivity. The crosslinked SWNTs in-between can provide continuous ion/charge transport ‘highways’, thus ensuring rapid ion/electron kinetics. As a result, such a self-supporting carbon anode exhibits remarkable rate performance (330 mAh g−1 at 0.1 C and 272 mAh g−1 at 5 C), superior initial Coulombic efficiency of 95.2% and outstanding cycling stability.
期刊介绍:
2D Materials is a multidisciplinary, electronic-only journal devoted to publishing fundamental and applied research of the highest quality and impact covering all aspects of graphene and related two-dimensional materials.