文献类型：期刊文献

英文题名：Eco-friendly utilization of sawdust: Ionic liquid-modified biochar for enhanced Li+ storage of TiO2

作者：Yu, Yang[1] Liu, Shuai[1] Wang, Wanting[1] Shang, Qianqian[2] Han, Jiangang[1] Liu, Chengguo[2] Tian, Ziqi[3] Chen, Jianqiang[1]

第一作者：Yu, Yang

通信作者：Chen, JQ[1]

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

年份：2021

卷号：794

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000691675400003)】；

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

语种：英文

外文关键词：TiO2/C interface; Sawdust; Lithium-ion battery; Ionic liquids; Cyclic stability

摘要：In China, forestry logging and wood processing produce hundreds of thousands of tons of sawdust every year, which is either discarded or burned. These nonecofriendly practices result in some challenges associated with greenhouse gas emissions. Sawdust-based biochar tailored for anodes of lithium-ion batteries (LIBs) can effectively realize value-added utilization of sawdust. The purpose of the current work is to prepare TiO2/biochar nanocomposites to improve the electrical conductivity and structural stability of the anode. However, poor interfacial interaction between TiO2 and carbon in the TiO2/C composites arising from their heterogeneous nature leads to structural deformation of the composites used as anodes of lithium-ion batteries (LIBs). A strategy of constructing ionic liquid-coupled biochar/TiO2 interfaces is proposed to obtain chemically bonded interfaces between TiO2 and sawdust-derived biochar. In this study, TiO2/C-880 composites are prepared by one-step carbonization of TiO2 nanoparticles (NPs) and sawdust at 880 degrees C previously dissolved in 1-butyl-3-methyl-imidazolium ([Bmim]H2PO4)/dimethyl sulfoxide (DMSO). The morphologies of TiO2/C-880 demonstrate that the TiO2 is encapsulated by porous biochar with intimate interfaces, and the X-ray photoelectron spectroscopy (XPS) results indicate the formation of N-Ti-O/N-O-Ti and Ti-O-P bonds that bridge the two components. TiO2/C-880 electrodes have high reversible specific capacities (404 mAh g(-1) at 0.1 A g(-1)) and desirable long-term cyclic stability (100 mAh g(-1) at 2 A g(-1) throughout 2500 cycles). Moreover, large diffusion coefficients (DLi+) ranging from 5.9 x 10(-11) to 1.2 x 10(-9) cm(2) s(-1) are obtained from galvanostatic intermittent titration (GITT) curves. The N-Ti-O/N-O-Ti and Ti-O-P bonds at the interfaces offer routes for fast Li+/electron transport, which account for the high performance of the TiO2/C-880 electrodes. (C) 2021 Elsevier B.V. All rights reserved.