In situ synthesis of core-shell structured Ge@NC hybrids as high performance anode material for lithium-ion batteries

doi:10.1016/j.cej.2018.09.113

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	In situ synthesis of core-shell structured Ge@NC hybrids as high performance anode material for lithium-ion batteries
	Wang, Bangrun; Jin, Jun; Wen, Zhaoyin
	2019-03-15
Source Publication	CHEMICAL ENGINEERING JOURNAL
ISSN	1385-8947
Volume	360 Pages:1301
Subtype	Article
Abstract	Core-shell structured germanium@nitrogen-doped carbon (Ge@NC) hybrids with well-encapsulated Ge particles within a conductive coating is an ideal anode material for high energy and power density lithium-ion batteries (LIBs). Here, we propose a novel route to synthesize core-shell structured Ge@NC hybrids by the modified in situ spray pyrolysis technique using a mixed spray solution consisting of a Ge precursor as an active material source and polyvinylpyrrolidone (PVP) as a carbon source. It is found that in situ formed submicron Ge (200-800 nm) crystals encapsulated in a N-doped carbon coating, allows the increase of electrical conductivity for Ge with enhanced structural stability. For lithium storage, the Ge@NC hybrids exhibit superior properties compared to that of pure Ge such as excellent long-term cycling stability (917 mAh g(-1) with a capacity decay of 0.018% per cycle for 1000 cycles at 1 C) and outstanding rate capability (806 mAh g(-1) at 5 C after 400 cycles). The full cell assembled with Ge@NC anode and LiNi0.5Co0.2Mn0.3O2 cathode presents high energy density. Moreover, the spray pyrolysis method allows a yield of similar to 4.8 g h(-1) with a lab-scale equipment, demonstrating that established industrial processes can be applied to produce Ge-based anodes with sophisticated structures.
Keyword	Lithium-ion batteries Anode materials Germanium Spray pyrolysis Core-shell structure
DOI	10.1016/j.cej.2018.09.113
Language	英语
WOS Research Area	Engineering
Publisher	ELSEVIER SCIENCE SA
Citation statistics	Cited Times:14[WOS] [WOS Record] [Related Records in WOS]
Document Type	期刊论文
Identifier	http://ir.sic.ac.cn/handle/331005/27271
Collection	中国科学院上海硅酸盐研究所
Recommended Citation GB/T 7714	Wang, Bangrun,Jin, Jun,Wen, Zhaoyin. In situ synthesis of core-shell structured Ge@NC hybrids as high performance anode material for lithium-ion batteries[J]. CHEMICAL ENGINEERING JOURNAL,2019,360:1301.
APA	Wang, Bangrun,Jin, Jun,&Wen, Zhaoyin.(2019).In situ synthesis of core-shell structured Ge@NC hybrids as high performance anode material for lithium-ion batteries.CHEMICAL ENGINEERING JOURNAL,360,1301.
MLA	Wang, Bangrun,et al."In situ synthesis of core-shell structured Ge@NC hybrids as high performance anode material for lithium-ion batteries".CHEMICAL ENGINEERING JOURNAL 360(2019):1301.

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