Improvement in the Electrochemical Lithium Storage Performance of MgH2

Inorganics

Min Zhu¹  Jiangwen Liu²  Hui Wang³  Liuzhang Ouyang³  Shuo Yang³ 

[1] Environmental Material, South China University of Technology, Guangdong 510641, China;;China-Australia Joint Laboratory for Energy &School of Materials Science and Engineering and Key Laboratory of Advanced Energy Storage Materials of Guangdong Province, South China University of Technology, Guangzhou 510641, China;

关键词: hydrogen storage materials;    MgH2;    anode material;    electrochemical performance;   

DOI  :  10.3390/inorganics6010002

来源: DOAJ

【 摘 要 】

Magnesium hydride (MgH2) exhibits great potential for hydrogen and lithium storage. In this work, MgH2-based composites with expanded graphite (EG) and TiO2 were prepared by a plasma-assisted milling process to improve the electrochemical performance of MgH2. The resulting MgH2–TiO2–EG composites showed a remarkable increase in the initial discharge capacity and cycling capacity compared with a pure MgH2 electrode and MgH2–EG composite electrodes with different preparation processes. A stable discharge capacity of 305.5 mAh·g−1 could be achieved after 100 cycles for the 20 h-milled MgH2–TiO2–EG-20 h composite electrode and the reversibility of the conversion reaction of MgH2 could be greatly enhanced. This improvement in cyclic performance is attributed mainly to the composite microstructure by the specific plasma-assisted milling process, and the additives TiO2 and graphite that could effectively ease the volume change during the de-/lithiation process as well as inhibit the particle agglomeration.

【 授权许可】

Unknown