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Analysis of Capacity Fading for High-power Lithium Ion Rechargeable Batteries

Article of Honda R&D Technical Review Vol.30 No.2


An analysis for elucidating the mechanism of capacity loss due to calendar aging in high-power lithium ion rechargeable batteries have been performed. The degradation of the batteries used in this research did not follow any particular trend with storage time, so that it could not be explained by the general, simple square root law. Electrochemical measurements revealed two factors that lead to degradation by a capacity balancing shift among the electrodes. The two factors are: the loss of active lithium which flows between anode and cathode, and cathode capacity fading. In order to identify the above two factors, we performed some material analyses of the battery. The results clearly showed that the loss of active lithium is caused by the formation of a solid electrolyte interphase due to reduction of solvent in electrolyte on the anode surface, and cathode capacity loss due to partial crystalline structure transition of the active material. A further detailed chemical composition analysis of the solid electrolyte interphase showed clearly that as the electrolyte components undergo electrochemical reductive degradation on the anode surface, an initial film largely dominated by organic components is first formed, then change in chemical composition and structure occurs whereby those organic components transform into inorganic components. However, the total amount of lithium in the film that was measured by material analysis did not match with the amount of cyclable lithium lost between the cathode and anode as obtained by electrochemical measurement techniques. We newly showed that there is the crucial need to determine the amount of the active lithium loss using electrochemical measurement techniques.


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Author (organization or company)

Pu QIAN(Automobile R&D Center)、Tomohiro KINOSHITA(Automobile R&D Center)、Hiroshi SAKAI(Automobile R&D Center)、Terumi FURUTA(Automobile R&D Center)、Mitsumoto KAWAI(Automobile R&D Center)

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