Li metal coated with amorphous Li3PO4 via magnetron sputtering for stable and long-cycle life lithium metal batteries

JOURNAL OF POWER SOURCES

卷:342

Article

Wang, Liping¹  Wang, Qingji¹  Jia, Weishang¹  Chen, Shulin²  Gao, Peng²  Li, Jingze¹ 

[1] Univ Elect Sci & Technol China, State Key Lab Elect Thin Films & Integrated Devic, Chengdu 610054, Peoples R China

[2] Peking Univ, Sch Phys, Beijing 100871, Peoples R China

关键词: Amorphous;    Lithium metal anode;    Lithium phosphate;    Lithium sulfur battery;    Magnetron sputtering;    Thin film;   

DOI  :  10.1016/j.jpowsour.2016.11.097

来源: Elsevier

【 摘 要 】

Lithium metal with high theoretical capacity (3860 mAh/g) and low operational voltage (-3.04 V vs. standard hydrogen electrode) reflects to be one of the most high energy density anodes for energy storage devices. While, its high chemical activity to continuously react with electrolytes causing low coulombic efficiency and formation of lithium dendrites leading safety concern limits practical applications. To conquer these challenges, amorphous Li3PO4 thin films with thickness of 0-200 nm are directly coated on the surface of Li metal foil via magnetron sputtering. The as-prepared Li3PO4 has almost insulated property with electronic conductivity of 1.4 x 10(-10) S/cm and ionic conductivity of 2.8 x 10(-8) S/cm. The conformal coating layer Li3PO4 can successfully suppress the lithium dendrites growth and improve its life span. The remarkable improvements of the Li3PO4-coated Li electrodes are mainly attributed to high chemical stability as well as amorphous nature of Li3PO4, which leads layer-by-layer growth Li film rather than islands form dendrites. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

Free