發(fā)布時(shí)間：2018-06-12 05:58

  本文選題：刺狀二氧化硅球 + 花型結(jié)構(gòu)碳納米球��； 參考：《溫州大學(xué)》2017年碩士論文

【摘要】：采用刺狀二氧化硅球作為模板,水熱可控制備構(gòu)建新穎三維花型結(jié)構(gòu)碳納米球作為硫宿主材料,擔(dān)載硫應(yīng)用于鋰硫電池正極�；谄涓弑缺砻娣e、大孔容以及互通介孔通道的結(jié)構(gòu)特點(diǎn),增加硫裝載量、抑制多硫化物溶解、利于電解液離子擴(kuò)散和遷移,以期改善電池性能。詳細(xì)探究宿主碳材料的結(jié)構(gòu)對(duì)鋰硫電池性能影響,揭示構(gòu)效關(guān)系。具體內(nèi)容如下:(1)采用水熱法合成刺狀二氧化硅納米球,探究影響二氧化硅納米球尺寸、形貌的關(guān)鍵因素,實(shí)現(xiàn)制備的可控性,并提出不同尺寸二氧化硅球形成的可能機(jī)理。(2)以刺狀二氧化硅納米球?yàn)槟０?葡萄糖為碳源,水熱法合成花型結(jié)構(gòu)碳納米球。通過(guò)控制碳源和模板的投料比、碳化溫度、碳化氣氛等實(shí)現(xiàn)對(duì)碳納米球的形貌、結(jié)構(gòu)調(diào)控。探究不同結(jié)構(gòu)碳納米球、擔(dān)載硫含量等因素對(duì)鋰硫電池容量、倍率性能以及循環(huán)穩(wěn)定性的影響,結(jié)合碳材料對(duì)多硫離子吸附、循環(huán)前后材料結(jié)構(gòu)和電解液的分析,揭示碳材料結(jié)構(gòu)與性能之間的關(guān)系。(3)以刺狀二氧化硅納米球?yàn)槟０?以殼聚糖為碳源和氮源,水熱法合成花型結(jié)構(gòu)氮摻雜碳納米球。研究不同碳化溫度、碳源和模板的投料比對(duì)碳材料結(jié)構(gòu)的影響,并進(jìn)一步探究不同結(jié)構(gòu)硫宿主碳材料對(duì)鋰硫電池性能的影響。另外,我們拓展該類花型結(jié)構(gòu)氮摻雜碳納米球在電催化氧還原中的應(yīng)用,詳細(xì)研究碳材料比表面積和氮摻雜含量對(duì)電催化氧還原性能的影響。
[Abstract]:Using spiny silica ball as a template, water and heat can be controlled to construct a novel three-dimensional flower type carbon nanosphere as a sulfur host material. The load of sulfur should be used as the cathode of lithium sulfur battery. Based on its high specific surface area, large pore volume and the structure characteristics of interconnected mesoporous channels, the amount of sulfur loading can be increased, the dissolution of polysulfide is inhibited and the electrolyte ion is favorable. Diffusion and migration in order to improve the performance of the battery. The influence of the structure of the host carbon material on the performance of the lithium sulfur battery is detailed. The specific contents are as follows: (1) the key factors affecting the size and morphology of the silica nanospheres are investigated by the hydrothermal method, and the controllability of the preparation is realized. The possible mechanism of the formation of SiO2 spheres. (2) the morphology and structure of carbon nanospheres are controlled by controlling the feeding ratio of the carbon source and the template, the temperature of the carbonization and the carbonization atmosphere, and the different structure carbon nanospheres and the carrying sulfur are carried out by the template of the spiny silica nanosphere and the glucose as the carbon source. The influence of content and other factors on the capacity, ratio performance and cyclic stability of lithium sulfur batteries, the relationship between structure and properties of carbon materials was revealed by the adsorption of polysulfide ions and the analysis of the structure and electrolyte of carbon materials before and after the cycle. (3) the preparation of chitosan as a template and chitosan as carbon source and nitrogen source, and hydrothermal synthesis of chitosan as a carbon source and nitrogen source. The effects of different carbonization temperatures, carbon sources and templates on the structure of carbon materials were investigated, and the effects of carbon materials on the properties of lithium sulfur batteries were further investigated. In addition, the application of this type of flower type nitrogen doped carbon nanospheres in the electrocatalytic oxygen reduction was studied in detail. The influence of specific surface area and nitrogen doping content of carbon materials on the performance of electrocatalytic reduction of oxygen.
【學(xué)位授予單位】：溫州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TQ127.11;TM912

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 Jin Won Kim;Joey D. Ocon;Dong-Won Park;Jaeyoung Lee;;Enhanced reversible capacity of Li-S battery cathode based on graphene oxide[J];Journal of Energy Chemistry;2013年02期

相關(guān)博士學(xué)位論文 前1條

1 苗力孝;網(wǎng)絡(luò)結(jié)構(gòu)碳/硫復(fù)合材料的制備及其在鋰硫電池中的電化學(xué)性能研究[D];北京理工大學(xué);2014年

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本文編號(hào)：2008620