基于交流阻抗谱的锂离子电池老化模式量化方法
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摘要
针对锂离子电池老化实验过程中交流阻抗谱呈现2种不同变化趋势的现象,加入了双等效电路模型分析的思路,设计了一种能适用于2种交流阻抗谱特性的老化模式量化方法 .根据这种老化模式量化方法,进行不同条件的电池老化实验,并研究了3种老化模式的变化趋势,指出一个适用于本实验电池的多种老化条件下的统一规律:活性锂离子损失和活性材料损失在老化过程中影响比较明显,其中活性材料损失影响最为明显,与活性材料损失相比,电导率损失与活性锂离子损失在老化过程中的影响较弱.
The electrochemical impedance spectroscopy of lithium-ion battery shows two different trends during the aging experiment. The idea of using two equivalent circuit models is add in the article. And the quantization method for degradation mode which can be applied to the two trends of electrochemical impedance spectrum is designed. According to the method, the battery aging experiments are performed under different conditions and the trends of three degradation modes are analyzed. And the phenomenon suitable for the battery used in the article is pointed out. The loss of lithium inventory and the loss of active material prove to be important in battery aging process, and the loss of active material proves to be more important. However, the conductivity loss has a little effect compared with the loss of lithium inventory and the loss of active material.
The electrochemical impedance spectroscopy of lithium-ion battery shows two different trends during the aging experiment. The idea of using two equivalent circuit models is add in the article. And the quantization method for degradation mode which can be applied to the two trends of electrochemical impedance spectrum is designed. According to the method, the battery aging experiments are performed under different conditions and the trends of three degradation modes are analyzed. And the phenomenon suitable for the battery used in the article is pointed out. The loss of lithium inventory and the loss of active material prove to be important in battery aging process, and the loss of active material proves to be more important. However, the conductivity loss has a little effect compared with the loss of lithium inventory and the loss of active material.
引文
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[14]Pastor F C,Uddin K,Chouchelamane G,et al.Acomparison between electrochemical impedance spectroscopy and incremental capacity-differential voltage as Li-ion diagnostic techniques to identify and quantify the effects of degradation modes within battery management systems[J].Journal of Power Sources,2017,360(31):301-318.
[2]Dubarry M,Liaw B Y,Chen M S,et al.Identifying battery aging mechanisms in large format Li ion cells[J].Journal of Power Sources,2011,196(7):3420-3425.
[3]Schindler S,Danzer M A.A novel mechanistic modeling framework for analysis of electrode balancing and degradation modes in commercial lithium-ion cells[J].Journal of Power Sources,2017,343(1):226-236.
[4]Dubarry M,Truchot C,Liaw B Y.Synthesize battery degradation modes via a diagnostic and prognostic model[J].Journal of Power Sources,2012,219(1):204-216.
[5]Lewerenz M,Warnecke A,Sauer D U,et al.Postmortem analysis on LiFePO4graphite cells describing the evolution&composition of covering layer on anode and their impact on cell performance[J].Journal of Power Sources,2017,369(1):122-132.
[6]Pastor F C,Dhammika W,Marco J,et al.Identification and quantification of ageing mechanisms in lithium-ion batteries using the EIS technique[C]//IEEE Transportation Electrification Conference and Expo,2016:1-6.
[7]Sethuraman V A,Hardwick L J,Srinivasan V,et al.Surface structural disordering in graphite upon lithium intercalation/deintercalation[J].Journal of Power Sources,2010,195(11):3655-3660.
[8]Zavalis T G,Klett M,Kjell M H,et al.Aging in lithium-ion batteries:Model and experimental investigation of harvested LiFePO4and mesocarbon microbead graphite electrodes[J].Electrochimica Acta,2013,110(1):335-348.
[9]Petzl M,Kasper M,Danzer M A.Lithium plating in a commercial lithium-ion battery-A low-temperature aging study[J].Journal of Power Sources,2015,275(1):799-807.
[10]Christensen J,Newman J.Stress generation and fracture in lithium insertion materials[J].Journal of Solid State Electrochemistry,2006,10(5):293-319.
[11]Klett M,Svens P,Tengstedt C,et al.Uneven film formation across depth of porous graphite electrodes in cycled commercial Li-ion batteries[J].Journal of Physical Chemistry C,2016,119(1):90-100.
[12]Braithwaite J W,Gonzales A,Nagasubramanian G,et al.Corrosion of lithium-ion battery current collectors[J].Journal of the Electrochemical Society,1999,146(2):448-456.
[13]Boukamp B A.Electrochemical impedance spectroscopy in solid state ionics:recent advances[J].Solid State Ionics,2004,169(1):65-73.
[14]Pastor F C,Uddin K,Chouchelamane G,et al.Acomparison between electrochemical impedance spectroscopy and incremental capacity-differential voltage as Li-ion diagnostic techniques to identify and quantify the effects of degradation modes within battery management systems[J].Journal of Power Sources,2017,360(31):301-318.