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Enhancing the depressed initial Coulombic efficiency of regenerated graphite anodes via the surface modification of a TiNb2O7 nanolayer

文献类型：期刊论文

作者Da, Haoran1,2; Li, Jin1,2; Shi, Jiateng1,2; Zhang, Haitao1,2
刊名CARBON
出版日期2022-06-30
卷号193页码:157-170
关键词Spent graphite Recycling Anode materials Structural repairment Initial coulombic efficiency enhancement
ISSN号0008-6223
DOI10.1016/j.carbon.2022.03.022
英文摘要Spent graphite (SG) anodes are extensively overlooked despite being a potential anode material on account of their relatively low cost when compared to the valuable metal elements of cathode materials. However, the cracked surface structure and unstable solid electrolyte interphase (SEI) of SG will lead to depressed initial Coulombic efficiency (ICE), which hampers the application of graphite recovery techniques. Here, a uniform layer of TiNb2O7 nanoparticles is successfully constructed on a damaged SG surface. Benefiting from the stable structure, the TiNb2O7 coating can effectively protect the cracked sites and enhance Li+& nbsp;diffusion. In addition, this layer can provide a high Li+& nbsp;insertion potential and effectively suppress the unfavorable formation of an unstable SEI. The TiNb(2)O(7 )coating can also provide extra capacity, compensating for the capacity fade of SG. After modification, the regenerated graphite not only exhibits enhanced rate performance by means of reconstructed Li+& nbsp;transfer channels but also demonstrates a prolonged cycle life due to the stabilized bulk structure. A full cell containing LiFePO4 and a regenerated graphite anode shows a high capacity retention, namely, 89.0% after 500 cycles at 1C. This study obtains regenerated graphite with a high ICE, thereby promoting the reutilization of spent graphite anodes. (C)& nbsp;2022 Elsevier Ltd. All rights reserved.
WOS关键词LITHIUM-ION-BATTERY ; ENERGY-STORAGE ; PERFORMANCE
资助项目National Key Research and Development Program of China[2019YFA0705600] ; Key Science and Technology Special Project of Henan Province[201111311400] ; Zhengzhou major Science and technology projects[2019CXZX0074] ; Key Program of Chinese Academy of Sciences[ZDRW_CN_2020-1] ; Key Research Program of Frontier Sciences, CAS[QYZDY-SSW-JSC011] ; Major Program of National Natural Science Foundation of China[21890762] ; Science Fund for Creative Research Groups of the National Natural Science Foundation of China[21921005]
WOS研究方向Chemistry ; Materials Science
语种英语
WOS记录号WOS:000799149000005
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Key Research and Development Program of China ; Key Science and Technology Special Project of Henan Province ; Zhengzhou major Science and technology projects ; Key Program of Chinese Academy of Sciences ; Key Research Program of Frontier Sciences, CAS ; Major Program of National Natural Science Foundation of China ; Science Fund for Creative Research Groups of the National Natural Science Foundation of China
源URL[http://ir.ipe.ac.cn/handle/122111/53635]  
专题中国科学院过程工程研究所
通讯作者Zhang, Haitao
作者单位1.Chinese Acad Sci, Inst Proc Engn, Beijing Key Lab Ion Liquids Clean Proc, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Sch Chem Engn, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Da, Haoran,Li, Jin,Shi, Jiateng,et al. Enhancing the depressed initial Coulombic efficiency of regenerated graphite anodes via the surface modification of a TiNb2O7 nanolayer[J]. CARBON,2022,193:157-170.
APA Da, Haoran,Li, Jin,Shi, Jiateng,&Zhang, Haitao.(2022).Enhancing the depressed initial Coulombic efficiency of regenerated graphite anodes via the surface modification of a TiNb2O7 nanolayer.CARBON,193,157-170.
MLA Da, Haoran,et al."Enhancing the depressed initial Coulombic efficiency of regenerated graphite anodes via the surface modification of a TiNb2O7 nanolayer".CARBON 193(2022):157-170.

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来源：过程工程研究所

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