Electrolyte design for LiF-rich solid-electrolyte interfaces to enable high-performance microsized alloy anodes for batteries

被引:884
作者
Chen, Ji [1 ]
Fan, Xiulin [1 ]
Li, Qin [1 ]
Yang, Hongbin [2 ]
Khoshi, M. Reza [3 ]
Xu, Yaobin [4 ]
Hwang, Sooyeon [5 ]
Chen, Long [1 ]
Ji, Xiao [1 ]
Yang, Chongyin [1 ,4 ]
He, Huixin [3 ]
Wang, Chongmin [4 ]
Garfunkel, Eric [2 ]
Su, Dong [5 ]
Borodin, Oleg [6 ]
Wang, Chunsheng [1 ,7 ]
机构
[1] Univ Maryland, Dept Chem & Biomol Engn, College Pk, MD 20742 USA
[2] Rutgers State Univ, Dept Chem, New Brunswick, NJ USA
[3] Rutgers State Univ, Dept Chem, Newark, NJ USA
[4] Pacific Northwest Natl Lab, Environm Mol Sci Lab, Richland, WA 99352 USA
[5] Brookhaven Natl Lab, Ctr Funct Nanomat, Upton, NY 11973 USA
[6] US Army Combat Capabil Dev Command Army Res Lab, Battery Sci Branch, Sensor & Electron Devices Directorate, Adelphi, MD 20783 USA
[7] Univ Maryland, Dept Chem & Biochem, College Pk, MD 20742 USA
关键词
SILICON MICROPARTICLE ANODES; LITHIUM METAL BATTERIES; ION BATTERY; MOLECULAR-DYNAMICS; ETHER ELECTROLYTES; INTERPHASE SEI; CHEMISTRY; EFFICIENCY; STABILITY; TRANSPORT;
D O I
10.1038/s41560-020-0601-1
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Lithium batteries with Si, Al or Bi microsized (>10 mu m) particle anodes promise a high capacity, ease of production, low cost and low environmental impact, yet they suffer from fast degradation and a low Coulombic efficiency. Here we demonstrate that a rationally designed electrolyte (2.0 M LiPF6 in 1:1 v/v mixture of tetrahydrofuran and 2-methyltetrahydrofuran) enables 100 cycles of full cells that contain microsized Si, Al and Bi anodes with commercial LiFePO4 and LiNi0.8Co0.15Al0.05O2 cathodes. Alloy anodes with areal capacities of more than 2.5 mAh cm(-2) achieved >300 cycles with a high initial Coulombic efficiency of >90% and average Coulombic efficiency of >99.9%. These improvements are facilitated by the formation of a high-modulus LiF-organic bilayer interphase, in which LiF possesses a high interfacial energy with the alloy anode to accommodate plastic deformation of the lithiated alloy during cycling. This work provides a simple yet practical solution to current battery technology without any binder modification or special fabrication methods. Chunsheng Wang and colleagues develop an electrolyte strategy to enable the use of commercially available microsized alloys, such as Si-Li, as high-performance battery anodes. They ascribe its success to the formation of robust LiF-rich layers as the solid-electrolyte interface.
引用
收藏
页码:386 / 397
页数:12
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