本文關(guān)鍵詞：基于海藻酸雙金屬氧化物氣凝膠的鋰離子電池負極材料的研究　出處：《青島大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 海藻酸鈉 氣凝膠 混合過渡金屬氧化物 鋰離子電池

【摘要】：高性能鋰離子電池需要具有理想微觀結(jié)構(gòu)的電極材料,以便實現(xiàn)快速的離子傳輸,短距離的固態(tài)離子擴散,較大的表面積,和較高的電導(dǎo)率。電極材料的微觀結(jié)構(gòu)決定了鋰離子電池的綜合性能。以可再生資源—海藻酸鈉為前驅(qū)體,制備的雙金屬氧化物(MTMOs)納米顆粒和碳納米管復(fù)合而成的高孔隙度三維氣凝膠成為研究熱點。本論文利用海藻酸通過離子交換過程,可以與金屬離子發(fā)生螯合,形成特殊的 蛋盒‖結(jié)構(gòu),制備二元金屬氧化物雜化氣凝膠。在復(fù)合氣凝膠中,雙金屬氧化物納米顆粒通過碳納米管互相連接,并嵌入碳氣凝膠基質(zhì)中,形成三維網(wǎng)絡(luò)結(jié)構(gòu),可以提供大的表面積、緩沖體積膨脹的空間、離子及電子快速傳輸?shù)穆窂?從而成為理想的高性能鋰離子電池負極材料。本文主要利用海藻酸鈉為基質(zhì),通過簡易的方法制備了具有多孔結(jié)構(gòu)的雙金屬氧化物/碳納米管復(fù)合氣凝膠材料。相比傳統(tǒng)的MTMOs/C材料,復(fù)合氣凝膠材料表現(xiàn)出優(yōu)異的電化學(xué)性能:鐵酸鈷摻雜碳納米管氣凝膠(CFO/CNT)在0.1 A g~(-1)的電流密度下循環(huán)160圈,容量高達1033 m Ah g~(-1);增加至1A g~(-1)循環(huán)160圈,容量仍可保持874 m Ah g~(-1)。鈷酸鋅摻雜碳納米管氣凝膠(ZCO/CNT)在0.1 A g~(-1)的電流密度下循環(huán)300圈,容量高達922 m Ah g~(-1);增加至1A g~(-1)循環(huán)300圈,容量仍可保持829 m Ah g~(-1)。鐵酸鋅摻雜碳納米管氣凝膠(ZFO/CNT)在0.1 A g~(-1)的電流密度下循環(huán)300圈,容量高達750 m Ah g~(-1);增加至1A g~(-1)循環(huán)300圈,容量仍可保持698 m Ah g~(-1)。該優(yōu)異的性能歸因于MTMO納米顆粒和CNT嵌入海藻酸制備的碳氣凝膠基質(zhì)中,形成三維網(wǎng)狀結(jié)構(gòu),產(chǎn)生的協(xié)同效應(yīng)對電池性能的提高具有重要意義。由此,我們研發(fā)了一種高效、環(huán)保、經(jīng)濟且可以大規(guī)模生產(chǎn)過渡金屬氧化物/碳納米管復(fù)合電極材料的新型方法。
[Abstract]:High performance lithium ion batteries need electrode materials with ideal microstructure in order to achieve fast ion transport, short distance solid ion diffusion and large surface area. The composite performance of lithium ion battery is determined by the microstructure of electrode material. The precursor is sodium alginate, a renewable resource. The preparation of bimetallic oxide (MTMOs) nanoparticles and carbon nanotubes (CNTs) composite three-dimensional aerogels with high porosity has become a research hotspot. In this thesis alginate is used through the process of ion exchange. Metal ions can be chelated to form a special egg box structure to prepare binary metal oxide hybrid aerogels. In the composite aerogel, the bimetallic oxide nanoparticles are connected with each other through carbon nanotubes. And embedded in the carbon aerogel matrix to form a three-dimensional network structure, can provide large surface area, buffer volume expansion space, ion and electron fast transport path. Thus it is an ideal anode material for lithium ion batteries with high performance. In this paper, sodium alginate is used as the base material. Bimetallic oxide / carbon nanotube composite aerogels with porous structure were prepared by a simple method compared with traditional MTMOs/C materials. The composite aerogel material showed excellent electrochemical performance: the carbon nanotube aerogel (CFO / CNT) of cobalt ferrate doped with carbon nanotube (CFO / CNT) cycle 160 cycles at the current density of 0.1 A g ~ (-1). Its capacity is as high as 1033mAh / g ~ (-1); Increase to 1 A g / L) cycle 160 laps. The capacity can still be maintained at 874 mAh / g ~ (-1). Zinc cobalt-doped carbon nanotube aerogel (ZCO / CNT) cycles 300 cycles at a current density of 0.1 A g / g ~ (-1). Its capacity is up to 922 mAh / g ~ (-1); Increase to 1 A g / L) cycle 300 laps. The capacity can still be maintained at 829 mAh / g ~ (-1). Zinc ferrate doped carbon nanotube aerogel ZFO-CNT can cycle 300 cycles at a current density of 0.1 A g ~ (-1). Its capacity is up to 750 mAh / g ~ (-1); Increase to 1 A g / L) cycle 300 laps. The MTMO nanoparticles and CNT were embedded in the carbon aerogel matrix prepared by alginic acid to form a three-dimensional network structure. The synergistic effect is of great significance to the improvement of battery performance. As a result, we have developed a kind of high efficiency and environmental protection. A new method for producing transition metal oxide / carbon nanotube composite electrode materials on a large scale.
【學(xué)位授予單位】：青島大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ427.26;TM912

【參考文獻】

相關(guān)期刊論文 前4條

1 王雨生;傅建祥;;生物質(zhì)能源的應(yīng)用技術(shù)研究[J];青島農(nóng)業(yè)大學(xué)學(xué)報(自然科學(xué)版);2015年03期

2 李偉善;;儲能鋰離子電池關(guān)鍵材料研究進展[J];新能源進展;2013年01期

3 馬君;馬興元;劉琪;;生物質(zhì)能源的利用與研究進展[J];安徽農(nóng)業(yè)科學(xué);2012年04期

4 蔣劍春;生物質(zhì)能源應(yīng)用研究現(xiàn)狀與發(fā)展前景[J];林產(chǎn)化學(xué)與工業(yè);2002年02期

，

本文編號：1401277