發(fā)布時(shí)間：2018-01-10 00:00

  本文關(guān)鍵詞：二氧化錳超級(jí)電容器電極材料制備及電化學(xué)性能研究　出處：《北京交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 超級(jí)電容器 材料形貌 MnO_2 石墨烯 PVDF 氮摻雜

【摘要】：作為一種新型儲(chǔ)能體系,超級(jí)電容器的快速發(fā)展有望克服鋰離子電池固有局限性。以二氧化錳(MnO_2)為代表的超級(jí)電容器電極材料,由于低導(dǎo)電性和低結(jié)晶度等缺點(diǎn),限制了它們?cè)诟吣芰棵芏瘸?jí)電容器領(lǐng)域中的應(yīng)用�，F(xiàn)今主要通過對(duì)電極結(jié)構(gòu)的可控制備與制備復(fù)合材料提升MnO_2電極材料電學(xué)性能。因此,本文選擇MnO_2作為研究對(duì)象,通過不同方式進(jìn)一步提升電學(xué)性能并探索相關(guān)的儲(chǔ)能機(jī)制。本論文的研究?jī)?nèi)容如下:(1)探究制備條件對(duì)電化學(xué)性能的影響,通過控制水熱反應(yīng)條件可控制備二氧化錳電極材料。通過不同表征手段結(jié)合電化學(xué)性能測(cè)試,分析二氧化錳相變過程與反應(yīng)條件之間的內(nèi)在聯(lián)系,探究最佳制備方案。通過實(shí)驗(yàn)發(fā)現(xiàn)二氧化錳在反應(yīng)過程中存在一個(gè)α→δ相變的過程。在140 ℃下水熱6小時(shí)制備出花狀δ-MnO_2納米球,電流密度為0.5Ag~(-1)時(shí)比電容可達(dá)192.7Fg~(-1),并且在1Ag~(-1)循環(huán)1000次后比電容保持率為94.6%,表明它是一種具有良好前景的超級(jí)電容器電極材料。(2)設(shè)計(jì)和制造了石墨烯/聚偏二氟乙烯(GO/PVDF)復(fù)合粘結(jié)劑,提升二氧化錳超級(jí)電容器電學(xué)性能。相比于物理混合粘結(jié)劑,采用石墨烯復(fù)合粘結(jié)劑制備的二氧化錳電極比電容在0.5 Ag~(-1)電流密度下可達(dá)220.1 Fg~(-1)。此外,該電極顯示優(yōu)異的循環(huán)穩(wěn)定性,1 A g~(-1)電流密度下循環(huán)1000次后比電容為198.8 Fg~(-1),電容保持率為90.1%。(3)通過水熱法制備花狀氮摻雜石墨烯/二氧化錳納米復(fù)合材料(NG-MnO_2)。所制備的氮摻雜復(fù)合材料孔徑約為0.765cm3g~(-1),比表面積為201.8m2g~(-1)。該材料具有優(yōu)異的倍率性能,10Ag~(-1)電流密度下比電容可達(dá)189.1 Fg~(-1)。1000次循環(huán)后,比電容保持率為98.3%以上,與活性炭組裝成不對(duì)稱電容器后可點(diǎn)亮紅色發(fā)光二極管(LED),具有良好的電學(xué)性能。
[Abstract]:As a new energy storage system, the rapid development of supercapacitors is expected to overcome the inherent limitations of lithium ion batteries. Because of low conductivity and low crystallinity and other shortcomings. It limits their application in the field of high energy density supercapacitors. Nowadays, the electrical properties of MnO_2 electrode materials are improved by the controllable preparation and fabrication of composite materials. This paper chooses MnO_2 as the research object. Through different ways to further improve the electrical properties and explore the related mechanisms of energy storage. The research content of this paper is as follows: 1) to explore the preparation conditions on the electrochemical performance. Manganese dioxide electrode materials can be controlled by controlling hydrothermal reaction conditions, and the intrinsic relationship between phase transition process and reaction conditions of manganese dioxide is analyzed by means of different characterization means and electrochemical performance test. To explore the best preparation method. It is found that there is a 偽 in the reaction process of manganese dioxide by experiment. 鈫扵he process of 未 phase transition. The flower-like 未 -MnO _ 2 nanospheres were prepared at 140 鈩，

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