Formation of Nanosized Defective Lithium Peroxides through Si-Coated Carbon Nanotube Cathodes for High Energy Efficiency Li-O-2 Batteries

doi:10.1021/acsami.8b04419

	Formation of Nanosized Defective Lithium Peroxides through Si-Coated Carbon Nanotube Cathodes for High Energy Efficiency Li-O-2 Batteries
	Lin, Qi 1; Cui, Zhonghui ; Sun, Jiyang 1; Huo, Hanyu 1; Chen, Cheng 1; Guo, Xiangxin 2
刊名	ACS APPLIED MATERIALS & INTERFACES
	2018
卷号	10 期号:22 页码:18754
关键词	Li-O-2 battery cathode surface properties nanosized Li2O2 charging overpotential Si modification
ISSN号	1944-8244
DOI	10.1021/acsami.8b04419
英文摘要	The formation and decomposition of lithium peroxides (Li2O2) during cycling is the key process for the reversible operation of lithium-oxygen batteries. The manipulation of such products from the large toroidal particles about hundreds of nanometers to the ones in the scale of tens of nanometers can improve the energy efficiency and the cycle life of the batteries. In this work, we carry out an in situ morphology tuning of Li2O2 by virtue of the surface properties of the n-type Si-modified aligned carbon nanotube (CNT) cathodes. With the introduction of an n-type Si coating layer on the CNT surface, the morphology of Li2O2 formed by discharge changes from large toroidal particles (similar to 300 nm) deposited on the pristine CNT cathodes to nanoparticles (10-20 nm) with poor crystallinity and plenty of lithium vacancies. Beneficial from such changes, the charge overpotential dramatically decreases to 0.55 V, with the charge plateau lying at 3.5 V even in the case of a high discharge capacity (3450 mA h g(-1)) being delivered, resulting in the high electrical energy efficiency approaching 80%. Such an improvement is attributed to the fact that the introduction of the n-type Si coating layer changes the surface properties of CNTs and guides the formation of nanosized amorphous-like lithium peroxides with plenty of defects. These results demonstrate that the cathode surface properties play an important role in the formation of products formed during the cycle, providing inspiration to design superior cathodes for the Li-O-2 cells.
学科主题	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000434895500035
资助机构	The authors would like to thank the financial supports from the National Key Basic Research Program of China (grant no. 2014CB921004), the Strategic Priority Research Program of the Chinese Academy of Science (grant no. XDA09010201), the National Natural Science Foundation of China (grant nos. 51772314, 51532002, and 51702346), and "Distinguished Taishan Scholar" project. ; The authors would like to thank the financial supports from the National Key Basic Research Program of China (grant no. 2014CB921004), the Strategic Priority Research Program of the Chinese Academy of Science (grant no. XDA09010201), the National Natural Science Foundation of China (grant nos. 51772314, 51532002, and 51702346), and "Distinguished Taishan Scholar" project.
内容类型	期刊论文
源URL	[http://ir.sic.ac.cn/handle/331005/24873]
专题	中国科学院上海硅酸盐研究所
作者单位	1.Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Qingdao Univ, Coll Phys, NingXia Rd 308, Qingdao 266071, Peoples R China
推荐引用方式 GB/T 7714	Lin, Qi,Cui, Zhonghui,Sun, Jiyang,et al. Formation of Nanosized Defective Lithium Peroxides through Si-Coated Carbon Nanotube Cathodes for High Energy Efficiency Li-O-2 Batteries[J]. ACS APPLIED MATERIALS & INTERFACES,2018,10(22):18754, 18760.
APA	Lin, Qi,Cui, Zhonghui,Sun, Jiyang,Huo, Hanyu,Chen, Cheng,&Guo, Xiangxin.(2018).Formation of Nanosized Defective Lithium Peroxides through Si-Coated Carbon Nanotube Cathodes for High Energy Efficiency Li-O-2 Batteries.ACS APPLIED MATERIALS & INTERFACES,10(22),18754.
MLA	Lin, Qi,et al."Formation of Nanosized Defective Lithium Peroxides through Si-Coated Carbon Nanotube Cathodes for High Energy Efficiency Li-O-2 Batteries".ACS APPLIED MATERIALS & INTERFACES 10.22(2018):18754.