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  本文關鍵詞：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》2017年碩士論文　論文類型：學位論文

  更多相關文章： 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構的電極材料,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,和較高的電導率。電極材料的微觀結構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‖結構,制備二元金屬氧化物雜化氣凝膠。在復合氣凝膠中,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)絡結構,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構的雙金屬氧化物/碳納米管復合氣凝膠材料。相比傳統(tǒng)的MTMOs/C材料,復合氣凝膠材料表現(xiàn)出優(yōu)異的電化學性能: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)狀結構,產(chǎn)生的協(xié)同效應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.
【學位授予單位】：青島大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TQ427.26;TM912

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本文編號：1401277