Roll-to-roll prelithiation of Sn foil anode suppresses gassing and enables stable full-cell cycling of lithium ion batteries

被引:179
作者
Xu, Hui [1 ,2 ]
Li, Sa [1 ,2 ]
Zhang, Can [1 ,2 ]
Chen, Xinlong [1 ,2 ]
Liu, Wenjian [1 ,2 ]
Zheng, Yuheng [1 ,2 ]
Xie, Yong [1 ,2 ]
Huang, Yunhui [1 ,2 ]
Li, Ju [3 ,4 ]
机构
[1] Tongji Univ, Sch Mat Sci & Engn, Shanghai 201804, Peoples R China
[2] Tongji Univ, Inst New Energy Vehicles, Shanghai 201804, Peoples R China
[3] MIT, Dept Nucl Sci & Engn, Cambridge, MA 02139 USA
[4] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA
基金
中国国家自然科学基金;
关键词
LEIDENFROST PHENOMENON; ELECTROLYTE ADDITIVES; IRREVERSIBLE CAPACITY; THERMAL-STABILITY; C COMPOSITE; BEHAVIOR; REDUCTION; INTERFACE; CATALYST;
D O I
10.1039/c9ee01404g
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Tin foil should have outstanding volumetric capacity as a Li-ion battery anode; however, it suffers from an unacceptable initial coulombic efficiency (ICE) of 10-20%, which is much poorer than that of Si or SnO2 nanoparticles. Herein, we demonstrate that bare Sn catalyzes liquid electrolyte decomposition at intermediate voltages to generate gas bubbles and Leidenfrost gas films, which hinder lithium-ion transport and erode the solid-electrolyte interphase (SEI) layer. By metallurgically pre-alloying Li to make LixSn foil, the lower initial anode potential simultaneously suppresses gassing and promotes the formation of an adherent passivating SEI. We developed a universally applicable roll-to-roll mechanical prelithiation method and successfully prelithiated Sn foil, Al foil and Si/C anodes. The as-prepared LixSn foil exhibited an increased ICE from 20% to 94% and achieved 200 stable cycles in LiFePO4//LixSn full cells at 2.65 mA h cm(-2). Surprisingly, the LixSn foil also exhibited excellent air-stability, and its cycling performance sustained slight loss after 12 h exposure to moist air. In addition to LiFePO4, the LixSn foil cycled well against a lithium nickel cobalt manganese oxide (NMC) cathode (4.3 V and B4-5 mA h cm(-2)). The volumetric capacity of the LixSn alloy in the LFP//LixSn pouch cell was up to B650 mA h cm(-3), which is significantly better than that of the graphite anode on a copper collector, with a rate capability as high as 3C.
引用
收藏
页码:2991 / 3000
页数:10
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