本文關(guān)鍵詞：基于石墨烯柔性超級(jí)電容器電極材料及器件研究　出處：《電子科技大學(xué)》2016年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 石墨烯薄膜 復(fù)合材料 儲(chǔ)能材料 器件結(jié)構(gòu) 柔性超級(jí)電容器

【摘要】：近年來(lái),隨著可穿戴電子產(chǎn)品的不斷發(fā)展,作為其重要功能組件的柔性?xún)?chǔ)能器件受到了國(guó)內(nèi)外研究者的強(qiáng)烈關(guān)注和廣泛研究。柔性超級(jí)電容器因其工作原理簡(jiǎn)單、儲(chǔ)能效率高、循環(huán)壽命長(zhǎng)、成本低、環(huán)境友好以及良好的可植入性等優(yōu)點(diǎn),有望在下一代可穿戴電子產(chǎn)品中得到廣泛應(yīng)用�？纱┐麟娮赢a(chǎn)品特殊的應(yīng)用環(huán)境要求儲(chǔ)能元件須具備安全性高、便攜性好以及儲(chǔ)能量大的特點(diǎn)。而柔性超級(jí)電容器的儲(chǔ)能性能和實(shí)用性受電極材料、電解質(zhì)、器件結(jié)構(gòu)以及其他因素的影響。本論文從制備比電容高的石墨烯及其復(fù)合材料出發(fā),探究其作為柔性超級(jí)電容器電極材料的性能,成功地制備了高性能的柔性超級(jí)電容器,并初步考察了將其應(yīng)用于可穿戴電子設(shè)備的可行性。同時(shí),系統(tǒng)地研究了電極材料、電解質(zhì)、器件結(jié)構(gòu)對(duì)柔性超級(jí)電容器性能的影響。本論文的研究?jī)?nèi)容主要包括以下三個(gè)部分:(1)采用一種新型石墨烯薄膜制備方法,將氧化石墨烯的還原和石墨烯的成膜過(guò)程同步完成,可在低溫、短時(shí)間內(nèi)制備出高導(dǎo)電性(約為17Ωsq~(-1))的大面積石墨烯薄膜,并以該石墨烯薄膜為電極材料制備了高性能的柔性薄膜超級(jí)電容器(比電容可達(dá)152.4 m F cm~(-2))。同時(shí)還研究了薄膜電極厚度、器件面積等參數(shù)對(duì)器件儲(chǔ)能性能的影響。另外,對(duì)固態(tài)柔性超級(jí)電容器也進(jìn)行了系統(tǒng)的探索。(2)通過(guò)浸染和高溫處理兩個(gè)過(guò)程將石墨烯與棉纖維復(fù)合,制備了質(zhì)量輕、導(dǎo)電性好(約為900Ωsq~(-1))、電化學(xué)活性高的復(fù)合薄膜材料,并以其為電極材料制備了高性能的三明治—叉指結(jié)構(gòu)柔性超級(jí)電容器(比電容可達(dá)5.53 F cm~(-3))。此外,還提出一種可有效提升超級(jí)電容器儲(chǔ)能效率的三明治—叉指型器件結(jié)構(gòu),并系統(tǒng)地研究了器件結(jié)構(gòu)對(duì)超級(jí)電容器儲(chǔ)能性能的影響。(3)以線型棉纖維為骨架,經(jīng)過(guò)一步水熱法將其與石墨烯水凝膠/CNTs原位復(fù)合,制備了高機(jī)械性能的線型柔性電極。再結(jié)合聚合物電解質(zhì),制備了高性能的線型固態(tài)柔性超級(jí)電容器(比電容可達(dá)97.73μF cm~(-1),上萬(wàn)次的循環(huán)壽命),并初步探究了將其應(yīng)用于可穿戴電子設(shè)備的可行性。
[Abstract]:In recent years, with the continuous development of wearable electronic products. Flexible energy storage devices, which are important functional components of flexible supercapacitors, have been paid close attention to and widely studied by researchers at home and abroad. Flexible supercapacitors have the advantages of simple working principle, high energy storage efficiency, long cycle life and low cost. It is expected to be widely used in the next generation wearable electronic products due to its environmental friendliness and good implantability. The special application environment of wearable electronic products requires high safety of energy storage components. Good portability and large energy storage. The energy storage performance and practicability of flexible supercapacitors are determined by electrode materials, electrolytes. Based on the preparation of graphene with high capacitance and its composite materials, the properties of graphene as electrode materials for flexible supercapacitors were investigated. The high performance flexible supercapacitors were successfully prepared, and the feasibility of their application in wearable electronic devices was preliminarily investigated. At the same time, electrode materials and electrolytes were systematically studied. The effect of device structure on the performance of flexible supercapacitors. The main contents of this thesis include the following three parts: 1) A novel graphene thin film preparation method is used. The reduction of graphene oxide and the film forming process of graphene oxide were simultaneously completed, and a large area graphene thin film with high electrical conductivity (about 17 惟 sql-1) could be prepared at low temperature and in a short time. A high performance flexible thin film supercapacitor with a specific capacitance of up to 152.4 MF / cm ~ (-2) was prepared using the graphene film as the electrode material. The thickness of the thin film electrode was also studied. The influence of device area and other parameters on the energy storage performance of the device. In addition, the solid state flexible supercapacitors were also systematically explored. 2) graphene and cotton fiber were combined by soaking and high temperature treatment. The composite thin films with light weight, good electrical conductivity (about 900 惟 sql-1) and high electrochemical activity were prepared. A high performance sandwich / cross finger structure flexible supercapacitor with a specific capacitance of 5.53 F cm ~ (-1) ~ (3) was prepared by using it as an electrode material. A sandwich-cross-finger device structure which can effectively improve the energy storage efficiency of supercapacitors is proposed. The effect of device structure on the energy storage performance of supercapacitors is studied systematically. 3) the linear cotton fiber is used as the skeleton. The linear flexible electrode with high mechanical properties was prepared by one step hydrothermal method and in situ composite with graphene hydrogel / CNTs. Then the polymer electrolyte was bonded. A high performance linear solid state flexible supercapacitor with a specific capacitance of 97.73 渭 F / cm ~ (-1) and a cycle life of ten thousand times was prepared. The feasibility of applying it to wearable electronic devices is discussed.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：TM53

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