文献类型：期刊文献

英文题名：Ionic liquid-induced low temperature graphitization of cellulose-derived biochar for high performance sodium storage

作者：Yu, Yang[1] Ren, Zhuoya[1] Shang, Qianqian[3] Han, Jiangang[1] Li, Lei[2] Chen, Jianqiang[1] Fakudze, Sandile[1] Tian, Ziqi[2] Liu, Chengguo[3]

第一作者：Yu, Yang

通信作者：Chen, JQ[1];Tian, ZQ[2]

机构：[1]Nanjing Forestry Univ, Coll Biol & Environm, 159 Longpan Rd, Nanjing 210037, Peoples R China;[2]Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Zhongguan West Rd, Ningbo 315201, Peoples R China;[3]Chinese Acad Forestry, Inst Chem Ind Forestry Prod, 16 Suojin Wucun, Nanjing 210042, Peoples R China

年份：2021

卷号：412

外文期刊名：SURFACE & COATINGS TECHNOLOGY

收录：;EI(收录号：20211110088205);Scopus(收录号：2-s2.0-85102459425);WOS:【SCI-EXPANDED(收录号:WOS:000655555000025)】；

基金：This work was supported by the National Natural Science Foundation of China (31822009, 31770615), Fundamental Research Funds of CAF (CAFYBB2020QA005), the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) and Qing Lan Project of Jiangsu Province.

语种：英文

外文关键词：Biochar; Graphitization; Ionic liquids; Sodium-ion batteries; Density functional theory (DFT)

摘要：The graphitization of biochar by high temperature carbonization above 2000 degrees C or metal-based catalytic approaches posed specific hindrances to the industrial production of high-quality graphitic carbon from biomass. The use of imidazolium-based ionic liquids (ILs) to induce fast graphitization of biochar at a low temperature range has not yet been reported. In this work, the carbonization of microcrystalline cellulose and 1-butyl-3-methylimidazolium acetate (BMIMAcO) at the temperature range of 750 degrees C-1400 degrees C led to enhanced graphitization of the biochar in comparison with the carbonization of microcrystalline cellulose alone. The incorporation of intact imidazolium rings into carbon skeleton played a critical role in the formation of graphitic structure with high nitrogen content. The IL-induced cellulose carbon obtained at 1000 degrees C (ICC-1000) with 5.67 at.% of nitrogen-doping presented interconnected graphitic nanosheets with 0.488 nm interlayer spacing and abundant mesopores and macropores on the surface. When used as anodes of sodium-ion batteries (SIBs), the ICC-1000 exhibited stable reversible capacity around 391 mAh g(-1) at 100 mA g(-1) for 100 cycles and 136 mAh g(-1) at 500 mA g(-1) for 1000 cycles, showing satisfactory sodium storage performance. Kinetic analysis of Na+ storage revealed that the ICC-1000 showed obvious capacitive characteristics and improved electric conductivity. DFT calculations suggested an interlayer spacing of 4.9 angstrom for optimal Na+ intercalation in multilayer graphene, and the capacity of pristine multilayer graphene was greatly improved from 69.8 to 527.3 mAh g(-1) after 4.8 at.% of N-doping.