發(fā)布時(shí)間：2018-05-04 21:07

  本文選題：Ni-MnLDH + Ni-MnLDO�。� 參考：《上海應(yīng)用技術(shù)大學(xué)》2017年碩士論文

【摘要】：超級電容器因具有快速充放電、功率密度高、循環(huán)穩(wěn)定性好等優(yōu)點(diǎn)成為人們研究的熱點(diǎn),而其性能的好壞主要由電極材料決定,因此,研發(fā)性能優(yōu)異的電極材料備受人們的關(guān)注。超級電容器工作電極主要由碳、金屬氧化物/氫氧化物、導(dǎo)電聚合物以及他們的復(fù)合材料幾類,其中碳材料具有較好的導(dǎo)電性、功率密度和循環(huán)穩(wěn)定性,但其比容量較低;金屬氧化物/氫氧化物具有較高的比容量,但功率密度較小,且導(dǎo)電性不好。此外,過渡金屬氧化物/氫氧化物具有獨(dú)特的二維柱狀結(jié)構(gòu),同時(shí)具備雙電層和贗電容兩種性質(zhì)的電容,但單一的過渡金屬氧化物/氫氧化物能量密度較低,不能滿足人們對電容器性能的要求。針對其缺陷,近年來人們努力研發(fā)其與碳、導(dǎo)電聚合物等物質(zhì)的復(fù)合材料。本論文主要研究了過渡金屬Ni-Mn LDH和Ni-Mn LDO的復(fù)合電極材料,具體研究內(nèi)容如下:(1)以三維大孔網(wǎng)狀結(jié)構(gòu)的泡沫鎳為基底,以廉價(jià)的葡萄糖為碳源,通過簡單的兩步水熱法得到柔性LNC復(fù)合電極材料。LNC可以直接用作工作電極,不需要粘合劑和導(dǎo)電劑的加入。通過在三電極體系中測試發(fā)現(xiàn),在0.5 A g-1的電流密度條件下,比容量達(dá)到1916Fg-1。將其組裝成不對稱電容器器件,在0.5 Ag-1的電流密度條件下,比容量達(dá)到121 F g-1,并且在5 A g-1的電流密度條件下充放電循環(huán)5000圈后,比容量仍然保持在84.3%,具有良好的循環(huán)穩(wěn)定性和功率密度,這在實(shí)際應(yīng)用中具有很大的意義。(2)通過簡單的水熱-碳化操作處理,得到三維石墨烯溶洞花球狀Ni-Mn LDO復(fù)合材料(GL)。GL具有很好的階層結(jié)構(gòu),在三電極體系中測試表明,在0.5 Ag-1的電流密度條件下,比容量達(dá)到1648 Fg-1,即使在大電流密度10 A g-1條件下比容量仍然可以達(dá)到1252 Fg-1,并且在循環(huán)充放電6000圈后,比容量保持率仍在96%,具有很好的循環(huán)穩(wěn)定性,這在實(shí)際應(yīng)用中具有重要的意義。在不對稱電容器器件測試中,也具有很好的電化學(xué)性能。
[Abstract]:Supercapacitors with the advantages of rapid charge and discharge, high power density and good cycle stability have become the focus of research, and the performance of supercapacitors is mainly determined by electrode materials. The research and development of electrode materials with excellent performance has attracted people's attention. The working electrodes of supercapacitor are mainly composed of carbon, metal oxide / hydroxide, conductive polymer and their composite materials. The carbon materials have good electrical conductivity, power density and cyclic stability, but their specific capacity is low. Metal oxide / hydroxide has high specific capacity, but low power density and poor conductivity. In addition, transition metal oxide / hydroxide has a unique two-dimensional columnar structure, and a double layer and pseudo-capacitance capacitors, but a single transition metal oxide / hydroxide has a low energy density. It can not meet the requirements of capacitor performance. Due to its defects, people have been developing composites with carbon, conductive polymers and other materials in recent years. In this paper, the composite electrode materials of transition metal Ni-Mn LDH and Ni-Mn LDO are studied. The main contents are as follows: 1) the nickel foam with three dimensional macroporous network structure is used as the substrate, and the cheap glucose is used as the carbon source. The flexible LNC composite electrode material. LNC can be directly used as the working electrode by a simple two step hydrothermal method without the addition of binder and conductive agent. It was found that the specific capacity reached 1916 Fg-1 at the current density of 0.5 A g ~ (-1) in a three-electrode system. The device is assembled into an asymmetric capacitor. The specific capacity of the device is 121F g-1 at the current density of 0.5 Ag-1, and the charge / discharge cycle is 5000 cycles at the current density of 5 A g ~ (-1). The specific capacity remains at 84.3, with good cyclic stability and power density, which is of great significance in practical applications. Three dimensional graphene cavernous spherical Ni-Mn LDO composite (GLN. GL) has a good hierarchical structure. The results of three-electrode system show that at the current density of 0. 5 Ag-1, the structure of GLN / GL is very good. The specific capacity can reach 1648 Fg-1, even under the condition of high current density 10 A g ~ (-1), the specific capacity can still reach 1252 Fg-1, and the specific capacity retention rate is still 96% after the cycle charge and discharge of 6000 cycles, which has good cycle stability. This is of great significance in practical application. It also has good electrochemical performance in the measurement of asymmetric capacitor devices.
【學(xué)位授予單位】：上海應(yīng)用技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TB331;TM53

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本文編號：1844652