發(fā)布時間：2018-04-27 20:28

  本文選題：鉛炭超級電池 + 負(fù)極�。� 參考：《浙江工業(yè)大學(xué)》2014年碩士論文

【摘要】：近幾年,鉛炭電池和超級電池的研究己逐漸得到業(yè)界重視。然而,碳材料的研究還存在著一些問題。尤其是碳材料與鉛粉混合均勻性差、結(jié)合力不理想以及引發(fā)負(fù)極析氫的問題。所以,碳材料的改性和加入方式是鉛炭電池和超級電池的研究關(guān)鍵。 本論文以碳材料和鉛粉復(fù)合材料的制備和改性為出發(fā)點,采用不同的碳材料與鉛粉進行復(fù)合得到不同結(jié)構(gòu)的復(fù)合材料；采用XRD、SEM、TEM等方法進行材料結(jié)構(gòu)的表征；采用三電極體系和LAND測試系統(tǒng)對材料進行電化學(xué)性能測試。研究內(nèi)容如下： 以改性的葡萄糖為碳源,通過液相包覆、高溫碳化方法,制備C@Pb復(fù)合材料,以此作為鉛炭超級電池的負(fù)極材料。XRD和TEM的表征,表明該復(fù)合材料表面的碳層包覆均勻,而且并不影響鉛粉的晶型結(jié)構(gòu)。CV掃描的測試,發(fā)現(xiàn)氧化銦和氧化鉍都有較好的析氫抑制效果,其中氧化銦效果最佳,而且復(fù)合材料的比電容明顯提升。通過LAND電池系統(tǒng)的測試,碳包覆的鉛粉負(fù)極材料的初始容量有了明顯的提升,而且充放電和循環(huán)性能上也得到了很大的提高。這歸因于鉛粉表面包覆均勻的碳層能夠抑制鉛活性物質(zhì)的團聚以及減小鉛活性物質(zhì)在電解液中裸露的面積。 針對上述的實驗研究,采用析氫抑制劑氧化銦對石墨進行改性。以少量的葡萄糖作為粘結(jié)劑,將改性石墨與鉛粉進行混合,通過高溫?zé)Y(jié)得到石墨/鉛粉復(fù)合材料,以此作為鉛炭超級電池的負(fù)極材料。XRD和TEM的表征,發(fā)現(xiàn)存在石墨特征峰,鉛粉的晶型結(jié)構(gòu)不受影響,而且鉛粉表面覆蓋有石墨片。CV掃描的測試,發(fā)現(xiàn)氧化銦抑制析氫的效果極佳,而且復(fù)合材料的比電容明顯提高；該組裝電池進行電化學(xué)性能的測試,結(jié)果表明電池的初始容量有了明顯的提升,并且充放電和循環(huán)性能上也得到了很大的提高。原因在于鉛粉間分散的石墨片,能夠形成龐大的石墨導(dǎo)電網(wǎng)絡(luò)結(jié)構(gòu),加速了電子傳輸。 采用十六烷基三甲基溴化銨(CTAB)對鉛粉進行改性,使之帶上正電荷,并與氧化石墨烯(帶負(fù)電荷)靜電吸附,形成GOS@Pb復(fù)合材料,通過高溫還原成GNS@Pb復(fù)合材料,以此作為鉛炭超級電池的負(fù)極材料。XRD譜圖說明復(fù)合材料有明顯的石墨烯和鉛粉特征峰。SEM和TEM的測試,發(fā)現(xiàn)該復(fù)合材料鉛粉表面包覆著不規(guī)則的石墨烯,而且石墨烯并沒有發(fā)生團聚現(xiàn)象。CV曲線的研究,發(fā)現(xiàn)添加有氧化銦的復(fù)合材料性能最佳,并將其組裝成電池。通過電化學(xué)性能測試,結(jié)果表明電池的初始容量有了明顯的提升,而且充放電和循環(huán)性能上也得到了很大的改善。主要原因在于通過靜電吸附使鉛粉和石墨烯相互雜亂的分散,提高了鉛粉的分散性和利用率,相互連接的石墨烯片構(gòu)成了一個龐大的石墨烯導(dǎo)電網(wǎng)絡(luò),加速了電子的轉(zhuǎn)移和電解液的滲透速度,加快了硫酸鉛和鉛的轉(zhuǎn)化。
[Abstract]:In recent years, the research of lead-carbon battery and super-battery has been paid more and more attention. However, there are still some problems in the research of carbon materials. Especially, the mixing uniformity of carbon material and lead powder is poor, the binding force is not ideal, and the problem of negative hydrogen evolution is caused. Therefore, the modification and addition of carbon materials is the key to the research of lead carbon batteries and super batteries. In this paper, the preparation and modification of carbon and lead powder composites are taken as the starting point, and different carbon materials and lead powder are used to composite to obtain different structure composites, and the structure of the composites is characterized by XRDX SEMTEM and other methods. Three-electrode system and LAND system were used to test the electrochemical performance of the materials. The contents of the study are as follows: Using modified glucose as carbon source, C@Pb composites were prepared by liquid phase coating and high temperature carbonization. The results showed that the carbon layer on the surface of the composite was uniform, which was used to characterize the anode material of lead-carbon super battery. The results show that both indium oxide and bismuth oxide have better hydrogen evolution inhibition effect, in which indium oxide is the best, and the specific capacitance of the composite is obviously increased. Through the test of LAND battery system, the initial capacity of carbon-coated lead negative electrode material has been obviously improved, and the charge-discharge and cycling properties have also been greatly improved. This is attributed to the fact that the uniform carbon layer on the surface of lead powder can inhibit the agglomeration of lead active substances and reduce the exposed area of lead active substances in electrolyte. The graphite was modified by indium oxide, a hydrogen evolution inhibitor. With a small amount of glucose as binder, the modified graphite and lead powder were mixed and sintered at high temperature to obtain graphite / lead powder composite, which was used as the anode material of lead-carbon super battery. XRD and TEM were used to characterize the graphite characteristic peak. The crystal structure of lead powder is not affected, and the surface of lead powder is covered with graphite sheet. CV scan test, it is found that indium oxide has excellent inhibition effect on hydrogen evolution, and the specific capacitance of composite material is obviously improved. The results show that the initial capacity of the battery has been obviously improved, and the charge-discharge and cycle performance has also been greatly improved. The reason is that the dispersed graphite sheet between the lead powder can form a large graphite conductive network structure and accelerate the electron transmission. The lead powder was modified by cetyltrimethylammonium bromide (CTAB), which was positively charged and electrostatic adsorbed with graphene oxide (with negative charge) to form GOS@Pb composite, which was reduced to GNS@Pb composite at high temperature. The results showed that the composite had obvious graphene and lead powder characteristic peak. SEM and TEM. It was found that the composite lead powder was covered with irregular graphene on the surface. Moreover, the agglomeration of graphene was not observed. It was found that the composite with indium oxide had the best properties and assembled into a battery. The results of electrochemical performance test show that the initial capacity of the battery has been obviously improved, and the charge-discharge and cycling performance has also been greatly improved. The main reason lies in the dispersion of lead powder and graphene by electrostatic adsorption, which improves the dispersion and utilization ratio of lead powder. The graphene sheets connected with each other form a large graphene conductive network. It accelerates electron transfer and electrolyte permeation, and accelerates the transformation of lead sulfate and lead.
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM912

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相關(guān)期刊論文 前1條

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本文編號：1812196