Ionic liquid electrolyte for room to intermediate temperature operating Li metal batteries: Dendrite suppression and improved performance

JOURNAL OF POWER SOURCES

卷:453

Article

Hwang, Jinkwang¹  Okada, Haruki¹  Haraguchi, Ryutaro¹  Tawa, Shinya¹  Matsumoto, Kazuhiko¹  Hagiwara, Rika¹ 

[1] Kyoto Univ, Grad Sch Energy Sci, Sakyo Ku, Kyoto 6068501, Japan

关键词: Lithium metal anode;    Secondary batteries;    Ionic liquids;    Dendrite suppression;    Li deposition/dissolution;   

DOI  :  10.1016/j.jpowsour.2020.227911

来源: Elsevier

【 摘 要 】

Lithium metal is considered to be the ultimate negative electrode material to maximize the energy density of lithium secondary batteries based on its high theoretical specific capacity and low redox potential. Despite these outstanding features, lithium metal is facing difficulties in overcoming of dendritic lithium growth, low coulombic efficiency, and poor cycle performance. In this study, the Li [FSA]41-ethy1-3-methylimidazoliuml [FSA] (FSA(-) = bis(fluorosulfonyl)amide) ionic liquid system is proposed to be an electrolyte for wide temperature operable Li metal batteries. The ionic liquid presents unique properties of suppressing Li dendrite growth, dead Li accumulation, and long-life cycling performance across 25 and 90 degrees C. Full-cell tests with Li2FeP2O7 positive electrode and this ionic liquid electrolyte demonstrate the feasibility of operating lithium metal batteries from room to intermediate temperature. The full cell retained 99.1% of its initial capacity after 200 cycles with an average coulombic efficiency of 99.97%.

【 授权许可】

Free