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The defense date of the thesis is 2014-07-09
The current date is 2019-05-23
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URN etd-0708114-145325 Statistics This thesis had been viewed 957 times. Download 1 times. Author Ping Hung Lin Author's Email Address No Public. Department Chemical Engineering Year 2013 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 88 Title Storage Ageing and Diagnosis of Commercial Lithium Ion Battery Keyword Storage Ageing and Diagnosis of Commercial Lithi Storage Ageing and Diagnosis of Commercial Lithi Abstract Storage ageing effects and diagnosis of commercial lithium-ion battery with composite LMO-NMC cathode material has been studied. Sixteen sets of batteries were stored in four temperatures each with four depths of discharge for 12 months. The batteries were charged and discharged at a constant current every other month, and the impedances were determined in order to investigate the change inside the battery during charge and discharge, and to investigate the phenomenon of battery ageing. For diagnosis of composition of commercial battery, the V vs Q data of half cell established earlier were used to estimate the composition of the electrodes.
Mathematical models have been developed to predict the effect of ageing temperature, depth of discharge and ageing time on decrease of capacity and increase of impedance. The results show that model calculations agree well with experimental data, with R2 being 0.962 and 0.956.
Increasing storage temperature or decreasing depth of discharge increases the ageing of battery, including capacity decrease and impedance increase. Battery ageing results in the shift of peak (valley) of the plot of dQ/dV vs V towards high voltage side, as well as in the decrease of the height (depth) of the peak (valley).
By use of the half-cell data established earlier, we have developed a procedure to simulate the V vs Q plot and dQ/dV vs V plot of a full cell.The V vs Q plot of the simulated full cell agrees well with that of the commercial battery. However, there is a slight difference of 15mV for the position of part of the peaks in dQ/dV vs V plot. The reason is probably that the material used in our half cell is not exactly the same as that used in the commercial battery.
Advisor Committee none - advisor
She-huang Wu - co-chair
Files Date of Defense 2014-06-30 Date of Submission 2014-07-09