CN104658769A - 一种扣式双电层电容器的制备方法 - Google Patents
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- 229910002804 graphite Inorganic materials 0.000 claims abstract description 56
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- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000007864 aqueous solution Substances 0.000 claims abstract description 7
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- 239000003792 electrolyte Substances 0.000 claims abstract description 4
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- 229910017604 nitric acid Inorganic materials 0.000 abstract 1
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- H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
- H01G11/84—Processes for the manufacture of hybrid or EDL capacitors, or components thereof
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Abstract
本发明涉及材料化学制备技术领域,具体涉及一种扣式双电层电容器的制备方法。一种扣式双电层电容器的制备方法,采用如下步骤:配制浓硫酸-浓硝酸混合液,倒入装有天然鳞片石墨的烧杯中,静置24h,滤出石墨,水洗至pH值大于5,烘干;快速膨胀lmin。将活性炭粉末与膨胀石墨混合,搅拌下滴加无水乙醇,浸润,超声波振荡,真空干燥,即得膨胀石墨/活性炭(EP/AC)复合材料。将上述成品与导电炭黑、粘结剂聚四氟乙烯混合,滴加无水乙醇调至浆状,干燥,将固体混合物与泡沫镍压制电极片;电极片面对面放置,以KOH水溶液为电解液,组装成扣式电容器。本发明在大电流放电条件下可以保持较高的比电容,比电容下降率低于7%。制备的扣式双电层电容器性能优良。
Description
技术领域
本发明涉及材料化学制备技术领域,具体涉及一种扣式双电层电容器的制备方法。
背景技术
膨胀石墨(EP)又称柔性石墨,是纯石墨的一个分支。以天然鳞片石墨为原料,先经过化学处理生成石墨插层化合物,经水洗干燥后即为可膨胀石墨,再经高温处理制成膨胀石墨。膨胀石墨既保持了石墨原有的优良特性,同时又克服了天然石墨硬而脆的缺陷,并具有新的柔韧性。膨胀石墨复合法通常用于提高高分子材料的导电性,即把膨胀石墨添加到高分子材料基体中形成多相复合材料,它具有质量轻、易成型、成本低的特点,并可在大范围内通过调节膨胀石墨的用量来改变材料的电性能。随着膨胀石墨含量的增加,导电粒子之间的距离变小,最终产生了可以让电子自由运动的导电通道,形成了导电网络,即当加入足够量的导电组分时,就达到了渗域滤理论中的渗域滤值,也就是在基体中形成导电网络所需的最小值。目前,复合材料领域的研究重点主要在高分子材料体系,研究的目的是通过复合导电物质使得本身绝缘的高分子材料
具有导电性,并通过改变填料的比例来改善复合材料的导电性能;而对于载炭材料,利用膨胀石墨复合法来研究其复合材料电性能的变化鲜见报道。
发明内容
本发明旨在提出一种膨胀石墨复合法来作为基础制备双电层电容器的制备方法。
本发明的技术方案在于:
一种扣式双电层电容器的制备方法,采用如下步骤:
步骤1:膨胀石墨的制备:
在搅拌和冷却的情况下,配制浓硫酸-浓硝酸混合液,并将其倒入装有天然鳞片石墨的烧杯中,静置24h,将石墨滤出,水洗至pH值大于5,在85℃烘干2h;将干燥好的石墨快速膨胀lmin,即得膨胀石墨。
步骤2: 膨胀石墨/活性炭复合材料的制备:
将活性炭粉末与膨胀石墨在烧杯中混合,在搅拌条件下滴加无水乙醇,将固体粉末混合物浸润,然后进行超声波振荡处理.真空90℃干燥20h后,即得膨胀石墨/活性炭(EP/AC)复合材料。
步骤3:扣式双电层电容器的制备:
将上述膨胀石墨/活性炭(EP/AC)复合材料与导电炭黑、粘结剂聚四氟乙烯(PTFE)混合,滴加无水乙醇后调至浆状,在70℃干燥2h,将固体混合物与泡沫镍压制成面积为lcm2的圆形电极片;将2个质量相等的电极片面对面放置,以KOH水溶液为电解液,组装成扣式电容器。
优选地,所述的浓硫酸-浓硝酸混合液的配比为体积比4:1。
优选地,所述的膨胀石墨/活性炭(EP/AC)复合材料与导电炭黑、粘结剂聚四氟乙烯(PTFE)的混合质量比为0.85:0.1:0.05。
或者优选地,所述的将固体混合物与泡沫镍压制时的压力为10MPa。
或者优选地,所述的KOH水溶液的质量比为30%。
本发明的技术效果在于:
本发明膨胀石墨孔隙尺寸匹配的活性炭微球及石油焦基活性炭在膨胀石墨模板中的分散状况较好,优于小粒径的椰壳基活性炭,颗粒周围存在大量的导电石墨片层,在大电流放电条件下依然可以保持较高的比电容,比电容下降率低于7%。制备的扣式双电层电容器性能优良。
具体实施方式
一种扣式双电层电容器的制备方法,采用如下步骤:
步骤1:膨胀石墨的制备:
在搅拌和冷却的情况下,配制浓硫酸-浓硝酸混合液,并将其倒入装有天然鳞片石墨的烧杯中,静置24h,将石墨滤出,水洗至pH值大于5,在85℃烘干2h;将干燥好的石墨快速膨胀lmin,即得膨胀石墨。
步骤2: 膨胀石墨/活性炭复合材料的制备:
将活性炭粉末与膨胀石墨在烧杯中混合,在搅拌条件下滴加无水乙醇,将固体粉末混合物浸润,然后进行超声波振荡处理.真空90℃干燥20h后,即得膨胀石墨/活性炭(EP/AC)复合材料。
步骤3:扣式双电层电容器的制备:
将上述膨胀石墨/活性炭(EP/AC)复合材料与导电炭黑、粘结剂聚四氟乙烯(PTFE)混合,滴加无水乙醇后调至浆状,在70℃干燥2h,将固体混合物与泡沫镍压制成面积为lcm2的圆形电极片;将2个质量相等的电极片面对面放置,以KOH水溶液为电解液,组装成扣式电容器。
其中,浓硫酸-浓硝酸混合液的配比为体积比4:1。膨胀石墨/活性炭(EP/AC)复合材料与导电炭黑、粘结剂聚四氟乙烯(PTFE)的混合质量比为0.85:0.1:0.05。固体混合物与泡沫镍压制时的压力为10MPa。KOH水溶液的质量比为30%。
Claims (5)
1. 一种扣式双电层电容器的制备方法,其特征在于:采用如下步骤:
步骤1:膨胀石墨的制备:
在搅拌和冷却的情况下,配制浓硫酸-浓硝酸混合液,并将其倒入装有天然鳞片石墨的烧杯中,静置24h,将石墨滤出,水洗至pH值大于5,在85℃烘干2h;将干燥好的石墨快速膨胀lmin,即得膨胀石墨;
步骤2: 膨胀石墨/活性炭复合材料的制备:
将活性炭粉末与膨胀石墨在烧杯中混合,在搅拌条件下滴加无水乙醇,将固体粉末混合物浸润,然后进行超声波振荡处理.真空90℃干燥20h后,即得膨胀石墨/活性炭(EP/AC)复合材料;
步骤3:扣式双电层电容器的制备:
将上述膨胀石墨/活性炭(EP/AC)复合材料与导电炭黑、粘结剂聚四氟乙烯(PTFE)混合,滴加无水乙醇后调至浆状,在70℃干燥2h,将固体混合物与泡沫镍压制成面积为lcm2的圆形电极片;将2个质量相等的电极片面对面放置,以KOH水溶液为电解液,组装成扣式电容器。
2.如权利要求1一种扣式双电层电容器的制备方法,其特征在于:所述的浓硫酸-浓硝酸混合液的配比为体积比4:1。
3.如权利要求1一种扣式双电层电容器的制备方法,其特征在于:所述的膨胀石墨/活性炭(EP/AC)复合材料与导电炭黑、粘结剂聚四氟乙烯(PTFE)的混合质量比为0.85:0.1:0.05。
4.如权利要求1一种扣式双电层电容器的制备方法,其特征在于:所述的将固体混合物与泡沫镍压制时的压力为10MPa。
5.如权利要求1一种扣式双电层电容器的制备方法,其特征在于:所述的KOH水溶液的质量比为30%。
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CN110282625A (zh) * | 2019-07-31 | 2019-09-27 | 上海应用技术大学 | 一种超级电容器电极材料的制备方法及应用 |
CN112723486A (zh) * | 2020-11-30 | 2021-04-30 | 河南开炭新材料设计研究院有限公司 | 一种用于废水处理三维多孔炭基材料的制备方法 |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN110282625A (zh) * | 2019-07-31 | 2019-09-27 | 上海应用技术大学 | 一种超级电容器电极材料的制备方法及应用 |
CN112723486A (zh) * | 2020-11-30 | 2021-04-30 | 河南开炭新材料设计研究院有限公司 | 一种用于废水处理三维多孔炭基材料的制备方法 |
CN112723486B (zh) * | 2020-11-30 | 2023-09-29 | 开封平煤新型炭材料科技有限公司 | 一种用于废水处理三维多孔炭基材料的制备方法 |
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