本文關(guān)鍵詞：鋰空氣電池多孔負(fù)極結(jié)構(gòu)及雙功能正極催化材料電化學(xué)性能分析　出處：《渤海大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 鋰空氣電池 多孔負(fù)極 雙功能催化劑 比容量 循環(huán)壽命

【摘要】：隨著環(huán)境污染日益嚴(yán)重,不可再生能源短缺日益加劇,開發(fā)一種新型環(huán)保的可持續(xù)能源勢在必行。鋰空氣電池由于具有高的理論比能量在全世界受到廣泛的關(guān)注。但是,在鋰空氣電池實現(xiàn)商業(yè)化的道路上還存在下列問題:電解液溶劑易揮發(fā)、電解液充電時易分解、鋰金屬負(fù)極易腐蝕、鋰枝晶的生長、正極空隙堵塞等。這些問題是目前鋰空氣電池研究的熱點,其中如何對鋰陽極進(jìn)行有效的保護(hù),如何提高陰極催化劑的催化性能是改善鋰空氣電池性能的關(guān)鍵。本文提出了一種雙氣體通道多孔陽極結(jié)構(gòu)的鋰空氣電池,能在電池內(nèi)部形成一個動態(tài)的氣相平衡,有效抑制了氧氣向陽極的滲透,從而保護(hù)了鋰陽極。通過對放電結(jié)束后陽極片的電子掃描顯微鏡和拉曼光譜分析,確定陽極腐蝕受到抑制。通過循環(huán)伏安,交流阻抗,恒流充放電及功率能量特性分析,這種新型的鋰空氣電池均具有良好表現(xiàn),首次放電容量能達(dá)到2910 mAh g~(-1),比能量達(dá)到7200 Wh kg~(-1),循環(huán)壽命能達(dá)到38次。本文還對鋰空氣電池陰極催化劑進(jìn)行了研究。用真空直流電弧法制備了一種納米催化材料Mn_3O_4/MnO。使用XRD、SEM、BET等手段對這種新型材料進(jìn)行了表征,結(jié)果顯示這種材料具有晶格缺陷和空位,大大提高了材料的電子電導(dǎo)率和催化活性,且顆粒尺寸與孔徑大小都適用于鋰空氣電池。將其制成電極組裝成鋰空氣電池,通過循環(huán)伏安、交流阻抗、恒流充放電等方法對其催化性能進(jìn)行了測試分析,發(fā)現(xiàn)這種催化劑在氧氧化和氧還原中均有很好的表現(xiàn),能大幅提高電池的循環(huán)壽命,在0.100 mA cm-2電流密度1000 mAh g~(-1)容量限制下可以穩(wěn)定工作29個循環(huán)。
[Abstract]:With the increasingly serious environmental pollution, the shortage of non-renewable energy is becoming more and more serious. It is imperative to develop a new kind of sustainable energy for environmental protection. Lithium air batteries have attracted wide attention all over the world because of their high theoretical specific energy. The following problems still exist in the commercialization of lithium-air batteries: the solvent of electrolyte is volatile, the electrolyte is easy to decompose when charging, the negative electrode of lithium metal is easy to corrode, and the growth of lithium dendrite. These problems are the focus of lithium air battery research, and how to protect the lithium anode effectively. How to improve the catalytic performance of cathode catalyst is the key to improve the performance of lithium-air battery. It can form a dynamic gas equilibrium in the battery, effectively inhibit the oxygen permeation to the anode, thus protecting the lithium anode. The anode is analyzed by scanning electron microscope and Raman spectroscopy after the discharge. It is determined that the anode corrosion is restrained. Through the analysis of cyclic voltammetry, AC impedance, constant current charge and discharge and power energy characteristics, this new type of lithium-air battery has good performance. The initial discharge capacity can reach 2910 mAh / g ~ (-1) and the specific energy reaches 7200 Wh / kg ~ (-1). The cycle life can reach 38 times. The cathode catalyst for lithium-air battery was studied in this paper. A nanometer catalytic material MnTi3O4 / MNO was prepared by vacuum DC arc method. XRD was used. The new material was characterized by means of SEMP-BET. The results show that the material has lattice defects and vacancies, which greatly improves the electronic conductivity and catalytic activity of the material. The particle size and pore size are suitable for lithium-air battery. The electrode is made into a lithium air battery, and its catalytic performance is tested by cyclic voltammetry, AC impedance, constant current charge and discharge and so on. It is found that the catalyst has a good performance in oxygen oxidation and oxygen reduction, and can greatly improve the cycle life of the battery. Under the limit of 0.100mA cm-2 current density 1000 mAh / g ~ (-1), 29 cycles can be stably operated.
【學(xué)位授予單位】：渤海大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：O643.36;TM911.41

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 蔡克迪;趙雪;仝鈺進(jìn);肖堯;高勇;王誠;;鋰氧電池關(guān)鍵技術(shù)研究[J];化學(xué)進(jìn)展;2015年12期

2 張棟;張存中;穆道斌;吳伯榮;吳鋒;;鋰空氣電池研究述評[J];化學(xué)進(jìn)展;2012年12期

，

本文編號：1410422