畢業(yè)設(shè)計(jì)-鋰離子電池交流阻抗(已修改)
2024-12-19 18:13 本頁(yè)面
【正文】 摘 要 電化學(xué)阻抗譜是研究電極 /電解質(zhì)界面發(fā)生的電化學(xué)過(guò)程的最有力工具之一，廣泛應(yīng)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(guò)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(shí)際的研究對(duì)象，通過(guò)對(duì)電池的內(nèi)部結(jié)構(gòu)和工作原理的分析，結(jié)合電極動(dòng)力學(xué)原理，采用基于電子運(yùn)動(dòng)理論的電極等效電路，同時(shí)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(xué)測(cè)量?jī)x器測(cè)量電池的電化學(xué)阻抗譜，通過(guò)對(duì)圖譜曲線的特征分析，采用專(zhuān)業(yè)的電化學(xué)阻抗譜分析軟件 ，對(duì)所測(cè)得的阻抗數(shù)據(jù)進(jìn)行數(shù)據(jù)擬合、分析。 關(guān)鍵詞 鋰離子電池 阻抗模型 電化學(xué)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(xué)阻抗譜與等效電路 ................................................................ 2 ................................................................................. 2 條件 ................................................................................. 2 ................................................................................. 3 3．電池的制備 ....................................................................................... 7 ................................................................................. 7 實(shí)驗(yàn)電池的制備 ................................................................................. 7 4．模擬與分析 ....................................................................................... 9 .......................................................................................... 9 ......................................................................... 12 ......................................................................... 13 .............................................................................................. 15 5．設(shè)計(jì)總結(jié) ......................................................................................... 16 參考文獻(xiàn) ............................................................................................... 17 1 1．緒論 鋰離子電池應(yīng)用現(xiàn)狀 隨著科技的發(fā)展，人們對(duì)生活環(huán)境質(zhì)量的要求愈來(lái)愈高，對(duì)相應(yīng)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(lǐng)域中， 鋰離子電池是廣泛應(yīng)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(zhǎng)，不含重金屬及有害物質(zhì)，不污染環(huán)境等優(yōu)點(diǎn)，是 真正意義上的綠色電源，而且手機(jī)、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?nèi)粘Ｉ钪斜匦杵?。小到從電子表?CD 唱機(jī)、移動(dòng)電話、 MP MP照相機(jī)、攝像機(jī)、各種遙控器、兒童玩具等。大到從醫(yī)院、賓館、超
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