【正文】 摘 要 電化學阻抗譜是研究電極 /電解質界面發(fā)生的電化學過程的最有力工具之一，廣泛應用于研究鋰離子在鋰離子電池嵌合物電極活性材料中的嵌入和脫出過程。本文講述了阻抗模型的研究背景和研究意義。選用正極材料為 LiFePO4 的鋰離子電池作為實際的研究對象，通過對電池的內部結構和工作原理的分析，結合電極動力學原理，采用基于電子運動理論的電極等效電路，同時考慮除電極以外的其他組成部分的等效元件，建立了電池阻抗模型。使用電化學測量儀器測量電池的電化學阻抗譜，通過對圖譜曲線的特征分析，采用專業(yè)的電化學阻抗譜分析軟件 ，對所測得的阻抗數(shù)據(jù)進行數(shù)據(jù)擬合、分析。 關鍵詞 鋰離子電池 阻抗模型 電化學阻抗譜 等效電路 Abstract Electrochemical impedance spectroscopy is one of the most powerful tools to analyze electrochemical processes occurring at electrode / electrolyte interfaces， and has been widely used to analyze the insertion / desertion process of lithium ion in the intercalation electrode for lithium ion battery. This paper presents the research background and meaning of the Impedance model. Lithium ion battery of LiFePO4 as positive electrode material is chosen as the research object， Through the analysis of internal structure and work principle of battery and binatio， with electrode dynamics theory， the equivalent circuit of electrode based on electron movement theory is adopted and the impedance model of battery is established ， with other apartment considered ． Measuring the electrochemical impedance spectroscopy of battery through electrochemical instrument . according to the character of impedance spectroscopy curve and frequency response of equivalent element. Impedance spectroscopy data is fitted and analyzed by special electrochemical software． Key words： lithium ion battery。 impedance model。 electrochemical impedance spectroscopy。 equivalent circuit 目 錄 1．緒論 ................................................................................................... 1 ........................................................................... 1 ........................................................................... 1 ................................................................... 1 2．電化學阻抗譜與等效電路 ................................................................ 2 ................................................................................. 2 條件 ................................................................................. 2 ................................................................................. 3 3．電池的制備 ....................................................................................... 7 ................................................................................. 7 實驗電池的制備 ................................................................................. 7 4．模擬與分析 ....................................................................................... 9 .......................................................................................... 9 ......................................................................... 12 ......................................................................... 13 .............................................................................................. 15 5．設計總結 ......................................................................................... 16 參考文獻 ............................................................................................... 17 1 1．緒論 鋰離子電池應用現(xiàn)狀 隨著科技的發(fā)展，人們對生活環(huán)境質量的要求愈來愈高，對相應的電池材料提出了更高的要求。 目前，在日常生活和工業(yè)化領域中， 鋰離子電池是廣泛應用的二次電池之一，與現(xiàn)有的可充放電池相比，它具有工作電壓高，體積小，能量效率高，循環(huán)壽命長，不含重金屬及有害物質，不污染環(huán)境等優(yōu)點，是 真正意義上的綠色電源，而且手機、手提電腦等數(shù)碼產(chǎn)品的日益普遍使鋰離子電池得到迅速的發(fā)展。已成為人們日常生活中必需品。小到從電子表、 CD 唱機、移動電話、 MP MP照相機、攝像機、各種遙控器、兒童玩具等。大到從醫(yī)院、賓館、超