Impacts of lean electrolyte on cycle life for rechargeable Li metal batteries

JOURNAL OF POWER SOURCES

卷:407

Article

Nagpure, Shrikant C.¹  Tanim, Tanvir R.¹  Dufek, Eric J.¹  Viswanathan, Vilayanur V.²  Crawford, Alasdair J.²  Wood, Sean M.¹  Xiao, Jie²  Dickerson, Charles C.¹  Liaw, Boryann¹ 

[1] Idaho Natl Lab, Energy Storage & Adv Vehicles Dept, Idaho Falls, ID 83415 USA

[2] Pacific Northwest Natl Lab, Electrochem Mat & Syst Grp, Richland, WA 99352 USA

关键词: Lithium metal battery;    Electrolyte;    High specific energy;    Cycle life;    Energy storage;   

DOI  :  10.1016/j.jpowsour.2018.10.060

来源: Elsevier

【 摘 要 】

Strong demand for higher energy batteries for extended range electric vehicles has driven battery technology development toward Li metal batteries. One limitation of Li metal batteries is cycle life. At odds are the amount of electrolyte to fulfill high energy and the amount needed to achieve long cycle life. Here we employ an electrochemical model and design of experiment to understand impacts on cycle life and failure as electrolyte content is reduced to levels needed to achieve reasonably high specific energy. With lean electrolyte, a gap exists in achieving long cycle life with a reduction by a factor of 6.5 when electrolyte amount is reduced from 37.0 g Ah(-1) to 6.0 g Ah(-1). Two primary failure routes are identified with differences between lean and high electrolyte quantities. The results suggest that reporting and performing experiments for high energy cell designs requires that amount of electrolyte be considered a critical parameter.

【 授权许可】

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