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標題: | 利用電池等效電路探討鋰離子電池阻抗頻譜與放電行為 Analysis of Spectrum and Discharging Behavior of Lithium-ion Battery Using Equivalent Circuit Model |
作者: | Meng-Ting Chang 張孟婷 |
指導教授: | 陳國慶(Kuo-Ching Chen) |
關鍵字: | 鋰離子電池,電化學阻抗頻譜法,電池阻抗頻譜,鋰離子電池等效電路,模擬方法,等效電路,電化學參數,電池放電行為,開路電壓, lithium-ion battery,Electrochemical Impedance Spectroscopy,spectra,simulation method,equivalent-circuit model,electrochemical parameter,discharging behavior,open circuit voltage, |
出版年 : | 2014 |
學位: | 碩士 |
摘要: | 鋰離子電池之廣泛使用,促使相關研究也隨之展開。低成本、高性能、大功率、壽命長、安全性是鋰離子電池主要的研究方向。其中,使用相關電池檢測方法,以瞭解電池的內部情況為各研究中相當重要的一部分。而電化學阻抗頻譜法(EIS)即是常見的電池檢測方法之一,其主要優點為檢測時間短,且為一種非破壞性檢測法。
在本論文中,主要利用電化學交流阻抗法(EIS)來量測鋰離子電池阻抗頻譜,並藉由電池等效電路來模擬鋰離子電池阻抗頻譜。為了準確模擬阻抗頻譜,我們建構了一套兼具電化學理論與數學模擬的擬合方法。我們也根據模擬結果中,等效電路各參數的分析與探討,進而了解不同實驗條件對鋰離子電池內部阻抗的影響。再者,我們利用電池等效電路模型中的參數來取得電池電化學模型建立過程中重的要電化學參數,即電極表面鋰離子擴散係數,以利電化學模型之建構。此外,鋰離子電池等效電路可進一步用於模擬電池的放電行為。在模擬的過程中,我們也提出了一個電池開路電壓估算法,可成功減少電池開路電壓量測所需時間 。 Many studies of lithium-ion battery (LIB) has been carried out because of the wide use of it. Cost reduction, performance improvement, increase of power, excellent cycle life along with high safety are the main targets of those studies. During the process of LIBs research, it is important to inspect the inner condition of LIBs by making battery examinations. Electrochemical Impedance Spectroscopy (EIS) is one of the commonly used examinations, which is a nondestructive testing and famous for its rapidity. In this thesis, the EIS measurement was performed to obtain the spectra of LIBs. In addition, we simulated the spectra through the equivalent circuit model (ECM) of LIBs. In order to simulate the spectra precisely, we established a simulation method based on electrochemistry and mathematics. Besides, the parameters of the ECM, which were obtained from the simulation results, were analyzed and studied for understanding the effects on the impedance of LIBs caused by different experimental settings. Furthermore, one of the parameters in the ECM helped us gain an important electrochemical parameter--the diffusion coefficient of lithium-ion, which was critical for establishing electrochemical model of LIBs. The equivalent circuit model of LIBs could be further used to simulate the discharging behavior of LIBs. We also provided a method for estimating open-circuit voltage (OCV) of LIBs. This method could successfully predict the OCV of LIBs and thus decrease the time consumed during OCV measurement. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/18707 |
全文授權: | 未授權 |
顯示於系所單位: | 應用力學研究所 |
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