Electrochemical performances of MgH2 and MgH2-C films for lithium ion battery anode

标题

Electrochemical performances of MgH2 and MgH2-C films for lithium ion battery anode

作者

作者:Peng, X (Peng, Xiang)^[1,2,3 ]; Wang, H (Wang, Hui)^[1,2,3 ]; Hu, RZ (Hu, Renzong)^[1,2,3 ]; Ouyan, LZ (Ouyan, Liuzhang)^[1,2,3 ]; Liu, JW (Liu, Jiangwen)^[1,2,3 ]; Zhu, M (Zhu, Min)^[1,2,3 ]

期刊信息

摘要

As a high-capacity hydrogen storage material, MgH2 also shows specific advantages for LIB anode. In this work, MgH2 and MgH2-C films were prepared by magnetron sputtering and hydrogenation treatment, and their microstructural and electrochemical properties were investigated. Through the conversion reaction of MgH2 with lithium (MgH2 + 2Li(+) -> Mg + 2LiH), the reversible lithium storage was achieved in the MgH2 and MgH2-C films. The MgH2 film delivers the initial discharge capacity of 313.9 Ah cm(-2) (similar to 2956 mAh g(-1)), the discharge and charge capacities related to the conversion process are respectively 150.0 mu Ah cm(-2) (similar to 1412 mAh g(-1)) and 55.0 mu Ah cm(-2) (similar to 518 mAh g(-1)), with the inefficiency of 63.3%. The GITT measurement determined the equilibrium potential of this conversion reaction to be 0.55 V vs. Li/Li+, and the voltage hysteresis between discharge and charge is only 10 mV vs. Li/Li+. In comparison with the MgH2 film, the MgH2-C film has smaller crystallite size, lower polarization effect and structural stability, but exhibiting lower capacity and equally poor cyclic performance. The poor cycle life of MgH2-C film electrode is due to the large irreversibility of conversion reaction of MgH2 instead of structural damage of film electrode during cycling. (C) 2017 Elsevier B.V. All rights reserved.

关键词

作者关键词:Lithium ion battery; Anode materials; MgH2; Film; Magnetron sputtering; Electrochemical properties

作者信息

作者信息

通讯作者地址:Wang, H (通讯作者)

South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510641, Peoples R China.   增强组织信息的名称     South China University of Technology

通讯作者地址:Wang, H (通讯作者)

South China Univ Technol, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Peoples R China.   增强组织信息的名称     South China University of Technology

地址:

	[ 1 ] South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510641, Peoples R China   增强组织信息的名称     South China University of Technology
	[ 2 ] South China Univ Technol, Key Lab Adv Energy Storage Mat Guangdong Prov, Guangzhou 510641, Peoples R China   增强组织信息的名称     South China University of Technology
	[ 3 ] South China Univ Technol, China Australia Joint Lab Energy & Environm Mat, Guangzhou 510641, Guangdong, Peoples R China   增强组织信息的名称     South China University of Technology

电子邮件地址:mehwang@scut.edu.cn

出版商

ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND

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