發(fā)布時間：2018-03-12 21:37

  本文選題：廢舊鋰離子電池　切入點(diǎn)：磷酸亞鐵鋰　出處：《河南師范大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：二十一世紀(jì)被稱為能源的時代，全人類面臨著能源枯竭的世界性難題，伴隨著日益尖銳的能源問題，環(huán)境污染的問題也愈發(fā)嚴(yán)峻。近年來為了同時緩解能源與環(huán)境問題，世界各國都在大力推行高效清潔的電動汽車。隨著電動汽車的發(fā)展，以磷酸鐵鋰作為正極材料的動力電池得到了廣泛的應(yīng)用，導(dǎo)致廢舊磷酸亞鐵鋰電池的數(shù)量逐年遞增。對這些廢舊電池的回收利用，不僅可以減少對環(huán)境的污染，同時還能推動新興產(chǎn)業(yè)的發(fā)展，帶來非�？捎^的經(jīng)濟(jì)效益。然而目前在回收廢舊磷酸亞鐵鋰電池再利用方面的研究較少。 廢舊鋰電池的回收再利用主要集中在對其中正極活性物的回收再利用。本論文研究了廢舊磷酸鐵鋰電池正極活性物與金屬集流體的分離回收；經(jīng)鹽酸溶解正極活性材料為原料，采用溶膠-凝膠法制成附加值較高的鋰鐵氧體材料；在此基礎(chǔ)上進(jìn)一步提出了摻雜Mn、Zn來提高產(chǎn)品的性能。并借助于XRD、IR、SEM、TG-DSC和VSM等技術(shù)，對制備過程進(jìn)行跟蹤檢測并對鐵氧體產(chǎn)品的微觀結(jié)構(gòu)、形貌和磁性能等進(jìn)行表征。 通過研究表明：廢舊磷酸亞鐵鋰電池正極片氮?dú)夥諊?00℃煅燒2h，可以很好的去除正極活性材料和金屬集流體間的膠黏劑——PVDF。鹽酸溶解廢舊磷酸亞鐵鋰電池正極活性材料的最佳條件：鹽酸濃度采用Vol（HCl）:Vol（H2O）=1:5，固液比為100g/L，溫度為60℃，，反應(yīng)時間為30min。采用溶膠-凝膠法制備鋰鐵氧體的最佳條件是：金屬離子與檸檬酸的摩爾比是1:1，溶膠pH為6，干凝膠煅燒溫度為800℃，煅燒時間3h。該條件下所制備鋰鐵氧體的磁性能參數(shù)是：飽和磁化強(qiáng)度（Ms）為53.372emu/g，矯頑力（Hc）為101.07G，剩余磁化強(qiáng)度（Mr）為13.387emu/g。Mn2+、Zn2+的摻雜不僅沒有改變鋰鐵氧體的尖晶石結(jié)構(gòu)，而且提高了鋰鐵氧體的磁性能，其中Zn2+的摻入對其磁性能的改善比較明顯。 本論文的創(chuàng)新點(diǎn)是：以廢舊磷酸亞鐵鋰電池為原料采用溶膠-凝膠法制備出具有尖晶石結(jié)構(gòu)的鋰鐵氧體；同時以廢舊磷酸亞鐵鋰電池為原料制備了摻雜取代鋰鐵氧體，來改善材料的各方面性能，研究了不同摻雜元素與不同摻雜量對鋰鐵氧體性能的影響。 本文為廢舊磷酸亞鐵鋰回收再資源化提出了新的發(fā)展方向，對廢舊磷酸亞鐵鋰的回收再利用具有一定的指導(dǎo)意義。為廢舊磷酸亞鐵鋰離子電池再資源化的工業(yè)化生產(chǎn)提供有益的基礎(chǔ)數(shù)據(jù)，具有良好的應(yīng)用前景，對資源的充分利用以及環(huán)境保護(hù)意義重大。
[Abstract]:In 21th century, called the era of energy, all mankind is faced with the worldwide problem of energy depletion. With the increasingly acute energy problem, the problem of environmental pollution is becoming more and more serious. In recent years, in order to alleviate the energy and environment problems at the same time, With the development of electric vehicles, the power battery with lithium iron phosphate as cathode material has been widely used. The number of waste lithium ferrous phosphate batteries is increasing year by year. The recycling of these batteries can not only reduce pollution to the environment, but also promote the development of new industries. However, little research has been done on recycling waste lithium ferrous phosphate batteries. The recovery and reuse of the waste lithium battery is mainly focused on the recovery and reuse of the cathode active material. In this paper, the separation and recovery of the cathode active material from the metal collector of the waste lithium iron phosphate battery are studied. Lithium ferrite materials with high added value were prepared by sol-gel method by using hydrochloric acid dissolved positive active materials as raw materials, and further improved the properties of the products by doping Mn-Zn. The TG-DSC and VSM techniques were also used to improve the properties of the products. The microstructure, morphology and magnetic properties of ferrite products were characterized. The results show that after calcined at 400 鈩

本文編號：1603390