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arXiv 2303.14908cond-mat.mtrl-sci
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通过粘合剂和电解质的组合作用实现的高能量和高功率一次Li-CF $_x$电池

High energy and high power primary Li-CF$_x$ batteries enabled by the combined effects of the binder and the electrolyte

Haobin Huo, Leon L. Shaw, Karoly Nemeth

摘要:

近年来,人们开发了几种有效的方法来证明锂-碳氟化物(CF $_x$)电池同时具有高能量和高功率密度。这些方法可以在纽扣电池中在60-70 kW/kg功率密度(40-50 C速率)下实现高达1000 Wh/kg能量密度,并且在软包电池中在12.5 kW/kg功率密度(20 C速率)下实现750 Wh/kg能量密度。这种性能是通过巧妙的纳米结构设计、可控孔隙率、硼掺杂和电解质添加剂实现的。在本研究中,我们表明,通过在锂-石墨氟化物纽扣电池中使用聚丙烯腈粘合剂和LiBF 4电解质,可以实现类似的高性能,即在59 kW/kg功率密度下931 Wh/kg能量密度。我们还证明,所观察到的效果是粘合剂和电解质的正确组合的结果。我们建议,所观察到的现象的机械起源是由聚丙烯腈粘合剂的电催化效应。虽然我们提出的方法具有竞争力的性能,它也提供了一个简单的实施和高能量和高功率的初级锂-CF $_x$电池的可扩展的生产。

英文摘要:

Several effective methods have been developed recently to demonstrate simultaneous high energy and high power density in Li - carbon fluoride (CF$_x$) batteries. These methods can achieve as high as 1000 Wh/kg energy density at 60-70 kW/kg power density (40-50 C rate) in coin cells and 750 Wh/kg energy density at 12.5 kW/kg power density (20 C rate) in pouch cells. This performance is made possible by ingenious nano-architecture design, controlled porosity, boron doping and electrolyte additives. In the present study, we show that a similarly great performance, 931 Wh/kg energy density at 59 kW/kg power density, can be achieved by using a polyacrylonitrile binder and a LiBF4 electrolyte in Li - graphite fluoride coin cells. We also demonstrate that the observed effect is the result of the right combination of the binder and the electrolyte. We propose that the mechanistic origin of the observed phenomena is an electro-catalytic effect by the polyacrylonitrile binder. While our proposed method has a competitive performance, it also offers a simple implementation and a scalable production of high energy and high power primary Li-CF$_x$ cells.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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