CN104701034A - 一种光波还原石墨烯膜电极的制备方法 - Google Patents
一种光波还原石墨烯膜电极的制备方法 Download PDFInfo
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Abstract
本发明公开了一种光波还原石墨烯膜电极的制备方法,其制备方法如下:按配比称取氧化石墨烯及溶剂,超声分散制成氧化石墨烯胶体溶液;利用高压静电喷雾装置在集流体上喷涂氧化石墨烯薄;在光波装置中还原为石墨烯薄膜;即得到本发明的光波还原石墨烯膜电极。本发明的优点是:本发明的光波还原石墨烯膜电极具有良好的导电性和三维结构,C/O比为6,而且无须添加任何导电剂和粘结剂,有利于提高超级电容和锂离子电池的克容量,而且没有牺牲其良好的倍率性能和循环性能。
Description
技术领域
本发明涉及电化学新能源领域,具体涉及一种光波还原石墨烯膜电极的制备方法。
背景技术
石墨烯是一种由碳原子构成的单层片状结构的新材料,是一种由碳原子以sp2杂化轨道组成六角型呈蜂巢晶格的平面薄膜。石墨烯是已知的世上最薄、最坚硬的纳米材料,导热系数高达5300 W/mK,高于碳纳米管和金刚石,常温下其电子迁移率超过15000 cm2/Vs,又比纳米碳管或硅晶体高,而电阻率只约10-8 Ωm,比铜或银更低,为世上电阻率最小的材料。因其电阻率极低,电子迁移的速度极快,因此被期待可用来发展更薄、导电速度更快的新一代电子元件或晶体管。
目前,石墨烯的主要生产方法主要有撕胶带法、轻微摩擦法、碳化硅表面外延生长、金属表面生长、氧化减薄石墨片法、肼还原法、切割碳纳米管法等。不断寻求简单有效的制备石墨烯并应用超级电容及电池中,一直是电化学新能源领域的研究工作者持续努力的方向。
发明内容
本发明提供了一种具有采用光波还原的石墨烯膜电极,该电极的制作过程无须添加任何导电剂和粘结剂,在锂离子电池及超级电容中应用具有良好的克容量、倍率性能及循环性能。
本发明采取的技术方案是:一种光波还原石墨烯膜电极的制备方法,其特征在于制备方法如下:
(1)按配比称取氧化石墨烯及溶剂,超声分散制成氧化石墨烯胶体溶液;
(2)利用高压静电喷雾装置在集流体上喷涂氧化石墨烯薄;
(3)在光波装置中还原为石墨烯薄膜;即得到本发明的光波还原石墨烯膜电极。
进一步,所述制成氧化石墨烯胶体溶液所用的溶剂是水或乙醇或二者混合溶液等环保溶剂。
进一步,所述高压电喷成膜的条件是:电压8-12KV,恒温温度40-60摄氏度。
进一步,所述光波还原石墨烯的光波生成装置可以是普通厨具的光波炉或卤素管加热装置;功率300-600W,加热时间3-10分钟。
进一步,所述电极的集流体是金属箔片或薄片。
优选:氧化石墨烯浓度6-10mg/ml,喷涂电压8-10KV,恒温60摄氏度,光波炉功率400W,加热时间6-9分钟。
更优选:氧化石墨烯浓度8 mg/ml,喷涂电压10KV,恒温60摄氏度,光波炉功率400W,加热时间7分钟。
本发明的积极效果如下:本发明的光波还原石墨烯膜电极具有良好的导电性和三维结构,C/O比为6,而且无须添加任何导电剂和粘结剂,有利于提高超级电容和锂离子电池的克容量,而且没有牺牲其良好的倍率性能和循环性能。
具体实施方式
下面的实施例是对本发明的进一步详细描述。
实施例1
制备方法具体如下:首先按配比称取氧化石墨烯及溶剂超声分散制成氧化石墨烯胶体溶液(水溶剂,6 mg/ml),然后利用高压静电喷雾装置(喷涂电压8KV,恒温40摄氏度)在集流体上喷涂氧化石墨烯薄,最后在光波装置中(光波炉,功率300W,加热6分钟)还原为石墨烯薄膜。即得到本发明的光波还原石墨烯膜电极。
实施例2
制备方法具体如下:首先按配比称取氧化石墨烯及溶剂超声分散制成氧化石墨烯胶体溶液(水溶剂,8 mg/ml),然后利用高压静电喷雾装置(喷涂电压10KV,恒温60摄氏度)在集流体上喷涂氧化石墨烯薄,最后在光波装置中(光波炉,功率600W,加热4分钟)还原为石墨烯薄膜。即得到本发明的光波还原石墨烯膜电极。
实施例3
制备方法具体如下:首先按配比称取氧化石墨烯及溶剂超声分散制成氧化石墨烯胶体溶液(水溶剂,8 mg/ml),然后利用高压静电喷雾装置(喷涂电压10KV,恒温60摄氏度)在集流体上喷涂氧化石墨烯薄,最后在光波装置中(光波炉,功率400W,加热10分钟)还原为石墨烯薄膜。即得到本发明的光波还原石墨烯膜电极。
实施例4
制备方法具体如下:首先按配比称取氧化石墨烯及溶剂超声分散制成氧化石墨烯胶体溶液(乙醇,6 mg/ml),然后利用高压静电喷雾装置(喷涂电压12KV,恒温50摄氏度)在集流体上喷涂氧化石墨烯薄,最后在光波装置中(光波炉,功率500W,加热8分钟)还原为石墨烯薄膜。即得到本发明的光波还原石墨烯膜电极。
实施例5
制备方法具体如下:首先按配比称取氧化石墨烯及溶剂超声分散制成氧化石墨烯胶体溶液(乙醇和水二者混合液,8 mg/ml),然后利用高压静电喷雾装置(喷涂电压9KV,恒温40摄氏度)在集流体上喷涂氧化石墨烯薄,最后在光波装置中(卤素管加热装置,功率300W,加热3分钟)还原为石墨烯薄膜。即得到本发明的光波还原石墨烯膜电极。
经测试,本发明实施例1-5所制备的光波还原石墨烯膜电极,研制的超级电容器以电流密度0.2A/g充放电,材料比容量可达到320F/g, 以1A/g充放电10000次,容量保持94%以上;以该电极研制的锂离子电池以0.2C充放电,材料比容量可达到1460mAh/g, 以1C倍率充放电1000次,容量保持90%以上。而且在制作的过程中无须添加任何导电剂和粘合剂,与化学法还原的石墨烯膜电极相比,具有一定的优势。
尽管已经示出和描述了本发明的实施例,对于本领域的普通技术人员而言,可以理解在不脱离本发明的原理和精神的情况下可以对这些实施例进行多种变化、修改、替换和变型,本发明的范围由所附权利要求及其等同物限定。
Claims (10)
1.一种光波还原石墨烯膜电极的制备方法,所述电极的集流体是金属箔片或薄片,其特征在于制备方法如下:
(1)按配比称取氧化石墨烯及溶剂,超声分散制成氧化石墨烯胶体溶液;
(2)利用高压静电喷雾装置在集流体上喷涂氧化石墨烯薄;
(3)在光波装置中还原为石墨烯薄膜;即得到光波为还原石墨烯膜电极。
2.根据权利要求1所述的一种光波还原石墨烯膜电极的制备方法,其特征在于:所述制成氧化石墨烯胶体溶液所用的溶剂是水或乙醇或二者混合溶液。
3.根据权利要求1所述的一种光波还原石墨烯膜电极的制备方法,其特征在于:所述高压电喷成膜的条件是:喷涂电压8-12KV,恒温温度40-60摄氏度。
4.根据权利要求1所述的一种光波还原石墨烯膜电极的制备方法,其特征在于:所述光波还原石墨烯的光波生成装置为普通厨具的光波炉或卤素管加热装置;其功率为300-600W,加热时间3-10分钟。
5.根据权利要求1所述的一种光波还原石墨烯膜电极的制备方法,其特征在于:所述氧化石墨烯浓度6-10mg/ml。
6.根据权利要求3所述的一种光波还原石墨烯膜电极的制备方法,其特征在于:所述喷涂电压8-10KV,恒温60摄氏度。
7.根据权利要求4所述的一种光波还原石墨烯膜电极的制备方法,其特征在于:所述光波炉功率400W,加热时间6-9分钟。
8.根据权利要求5所述的一种光波还原石墨烯膜电极的制备方法,其特征在于:所述氧化石墨烯浓度8 mg/ml。
9.根据权利要求6所述的一种光波还原石墨烯膜电极的制备方法,其特征在于:所述喷涂电压10KV。
10.根据权利要求7所述的一种光波还原石墨烯膜电极的制备方法,其特征在于:所述加热时间7分钟。
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CN106684315A (zh) * | 2017-01-05 | 2017-05-17 | 戴雪青 | 一种石墨烯电池负极的制备方法 |
CN108963186A (zh) * | 2018-04-11 | 2018-12-07 | 浙江湖州中科新伏能源科技有限公司 | 一种石墨烯滤膜的制备方法及其在电池中的应用 |
CN110311110A (zh) * | 2019-06-30 | 2019-10-08 | 东莞理工学院 | 一种基于石墨烯的柔性锂离子电池负极材料及其测试方法 |
CN111725477A (zh) * | 2020-06-16 | 2020-09-29 | 深圳市信宇人科技股份有限公司 | 一种锂离子电池的干法电极材料的制备方法 |
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CN103508447A (zh) * | 2012-06-26 | 2014-01-15 | 海洋王照明科技股份有限公司 | 石墨烯的制备方法 |
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CN103508447A (zh) * | 2012-06-26 | 2014-01-15 | 海洋王照明科技股份有限公司 | 石墨烯的制备方法 |
CN102881907A (zh) * | 2012-10-16 | 2013-01-16 | 湖南大学 | 一种锂离子电池用石墨烯基电极材料的制备方法 |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN106684315A (zh) * | 2017-01-05 | 2017-05-17 | 戴雪青 | 一种石墨烯电池负极的制备方法 |
CN108963186A (zh) * | 2018-04-11 | 2018-12-07 | 浙江湖州中科新伏能源科技有限公司 | 一种石墨烯滤膜的制备方法及其在电池中的应用 |
CN110311110A (zh) * | 2019-06-30 | 2019-10-08 | 东莞理工学院 | 一种基于石墨烯的柔性锂离子电池负极材料及其测试方法 |
CN111725477A (zh) * | 2020-06-16 | 2020-09-29 | 深圳市信宇人科技股份有限公司 | 一种锂离子电池的干法电极材料的制备方法 |
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