文献类型：期刊文献

英文题名：Ionic liquid-induced graphitization of biochar: N/P dual-doped carbon nanosheets for high-performance lithium/sodium storage

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

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：56

期号：13

起止页码：8186-8201

外文期刊名：JOURNAL OF MATERIALS SCIENCE

收录：;EI(收录号：20210609886801);Scopus(收录号：2-s2.0-85100335399);WOS:【SCI-EXPANDED(收录号:WOS:000613987300005)】；

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：Anodes - Carbonization - Energy storage - Energy utilization - Graphite - Graphitization - Ionic liquids - Lithium - Lithium-ion batteries - Metal ions - Nanosheets - Sodium-ion batteries

摘要：Biomass-derived graphitic carbon is becoming an attractive material for anodes in lithium-ion and sodium-ion batteries (LIBs and SIBs) owing to its sustainability. The graphitization of biochar by heating above 2600 degrees C not only requires high energy consumption but also removes heteroatoms that are conducive to electrochemical energy storage. In this study, graphitic carbon nanosheets with N/P-dual doping are facilely synthesized by one-step carbonization of pine sawdust at 800/ 1000/1200 degrees C that is priorly dissolved in 1-butyl-3-methyl-imidazolium ([Bmim]H2PO4) and used as anodes of LIBs/SIBs, respectively. [Bmim]H2PO4 simultaneously promotes the graphitization and porosities of the biochar as carbonization temperature increases in addition to providing N/Pdual doping. Used as anodes of LIBs, IWC-1200 demonstrates excellent rate performance and cyclic stability, delivering 385 mAh g(-1) at 1 Ag-1 throughout 1000 cycles. For sodium storage, IWC-1000 exhibits stable capacities of 217 mAh g(-1) at 0.1 A g(-1) and 101 mAh g(-1) at 1 Ag-1. The electrochemical performances benefit from the graphitized structure with N/P-dual doping, leading to redox pseudocapacitance for lithium/sodium storage. DFT calculations suggest that pyridinic N strongly attracts both Li and Na while P atoms inside the graphitic structure significantly increase the interlayer spacing. [GRAPHICS] .