Hybrid lithium-ion capacitor with LiFePO4/AC composite cathode - Long term cycle life study, rate effect and charge sharing analysis

JOURNAL OF POWER SOURCES

卷:392

Article

Shellikeri, A.^1,2  Yturriaga, S.²  Zheng, J. S.^3,4  Cao, W.⁵  Hagen, M.^1,2  Read, J. A.⁶  Jow, T. R.⁶  Zheng, J. P.^1,2,7 

[1] Florida State Univ, Florida A&M Univ, Coll Engn, Dept Elect & Comp Engn, Tallahassee, FL 32304 USA

[2] Florida State Univ, Aeroprop Mechatron & Energy Ctr, Tallahassee, FL 32310 USA

[3] Tongji Univ, Clean Energy Automot Engn Ctr, Shanghai 201804, Peoples R China

[4] Tongji Univ, Sch Automot Studies, Jiading Campus, Shanghai 201804, Peoples R China

[5] Gen Capacitor LLC, Tallahassee, FL 32304 USA

[6] US Army, Res Lab, Adelphi, MD 20783 USA

[7] Florida State Univ, CAPS, Tallahassee, FL 32310 USA

关键词: Hybrid energy storage device;    Composite cathode;    Li-ion capacitor;    Lithium iron phosphate;    Pre-lithiation;    Long cycle life;   

DOI  :  10.1016/j.jpowsour.2018.05.002

来源: Elsevier

【 摘 要 】

Energy storage devices, which can combine the advantages of lithium-ion battery with that of electric double layer capacitor, are of prime interest. Recently, composite cathodes, which combine a battery material with capacitor material, have shown promise in enhancing life cycle and energy/power performances. Lithium-ion capacitor (LIC), with unique charge storage mechanism of combining a pre-lithiated battery anode with a capacitor cathode, is one such device which has the potential to synergistically incorporate the composite cathode to enhance capacity and cycle life. We report here a hybrid LIC consisting of a lithium iron phosphate (LiFePO4-LFP)/Activated Carbon composite cathode in combination with a hard carbon anode, by integrating the cycle life and capacity enhancing strategies of a dry method of electrode fabrication, anode pre-lithiation and a 3:1 anode to cathode capacity ratio, demonstrating a long cycle life, while elaborating on the charge sharing between the faradaic and non-faradaic mechanism in the battery and capacitor materials, respectively in the composite cathode. An excellent cell capacity retention of 94% (1000 cycles at 1C) and 92% (100,000 cycles at 60C) were demonstrated, while retaining 78% (over 6000 cycles at 2.7C) and 67% (over 70,000 cycles at 43C) of the LFP capacity in the composite cathode.

【 授权许可】

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