Aging Mechanisms of LiFePO4 Batteries Deduced by Electrochemical and Structural Analyses

被引:301
作者
Liu, Ping [1 ]
Wang, John [1 ]
Hicks-Garner, Jocelyn [1 ]
Sherman, Elena [1 ]
Soukiazian, Souren [1 ]
Verbrugge, Mark [2 ]
Tataria, Harshad [2 ]
Musser, James [3 ]
Finamore, Peter [3 ]
机构
[1] HRL Labs LLC, Malibu, CA 90265 USA
[2] Gen Motors Corp, Warren, MI 48092 USA
[3] John Deere SE Engn Ctr, Charlotte, NC 28241 USA
关键词
ageing; crystal morphology; electrochemical analysis; electrochemical electrodes; lithium compounds; secondary cells; X-ray diffraction; LITHIUM-ION CELLS; DIFFERENTIAL VOLTAGE ANALYSES; ELECTRODE-SOLUTION INTERACTIONS; HIGH-POWER; CYCLE-LIFE; CALENDAR-LIFE; CRYSTAL-STRUCTURE; CAPACITY LOSS; DEGRADATION; CATHODES;
D O I
10.1149/1.3294790
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
The performance loss of lithium-ion batteries with lithium iron phosphate positive chemistry was analyzed using electrochemical characterization techniques such as galvanostatic charge-discharge at different rates, ac impedance, and hybrid pulse power characterization measurements. Differentiation analysis of the discharge profiles as well as in situ reference electrode measurement revealed loss of lithium as well as degradation of the carbon negative; the cell capacity, however, was limited by the amount of active lithium. Destructive physical analyses and ex situ electrochemical analyses were performed at test completion on selected cells. While no change in positive morphology and performance was detected, significant cracking and delamination of the carbon negative was observed. In addition, X-ray diffraction analysis confirmed the changes in the crystal structure of the graphite during cycling. The degradation of the carbon negative is consistent with the observations from the electrochemical analysis. Ex situ electrochemical analysis confirmed that active lithium controlled cell capacity and its loss with cycling directly correlated with cell degradation. The relationship between carbon negative degradation and loss of active lithium is discussed in the context of a consistent overall mechanism.
引用
收藏
页码:A499 / A507
页数:9
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