CN104979527A - 一种柔性锂-硫电池正极的制备方法 - Google Patents
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Abstract
一种柔性锂-硫电池正极的制备方法,按以下步骤:首先碳纳米管石墨化后加入蒸馏水、乙醇等溶剂中,剪切和分散得碳纳米管分散液;将纸纤维粉碎和打散,得纸纤维浆料;两者均匀混合,真空抽滤,制成碳纳米管-纸纤维复合导电纸,真空干燥。将硫溶解在苯或二流化碳溶剂中,调硫溶度为5%-40%;将上述复合导电纸浸入硫溶剂溶液中充分润湿,取出、真空干燥,扎制和裁剪成锂-硫电池正极极片。本发明活性材料和集流体一体化制作,简化了锂-硫电池的制备工艺。产品具有大量微孔和巨大表面积,提高了硫在极片中装载量和密度及锂-硫电池能量密度。碳材料和硫的亲和性,增加了硫和碳纳米管的接触界面,使得界面电阻大幅减小。
Description
技术领域
本发明属于电化学和功能材料领域,涉及碳纳米管、纸纤维、硫的溶解与吸附及三者的分散混合技术。
背景技术
锂-硫电池具有突出的高比能量优势和原料廉价、环境友好等优点,有望成为新一代高能电池体系,但循环性能差是制约其实用化的主要障碍。以金属锂为负极、单质硫为正极的锂-硫电池的理论比能量可达到2600 Wh / kg( 锂和硫的理论比容量分别为3860 mAh / g 和1675 mAh / g) ,远大于现阶段所使用的商业化二次电池,单质硫廉价、环境友好的特性又使该体系极具商业价值。
发明内容
本发明的目的是提出一种柔性锂-硫电池正极的制备方法,使用纳米分散技术和传统造纸技术,将碳纳米管、纸纤维和硫三组分组合在一起,通过造纸技术制成锂-硫电池正极所用包含碳纳米管、纸纤维和硫的片状板材,扎制和裁剪后用于制造各种规格锂-硫电池的正极极片。
本发明是通过以下技术方案实现的。
(1)碳纳米管经3000℃高温石墨化处理,然后将石墨化后的碳纳米管加入到蒸馏水、乙醇、苯、二甲苯或丙酮等溶剂中,再经高速剪切和砂磨机分散处理,制成碳纳米管分散液。
(2)用高速剪分散设备将纸纤维粉碎和打散,制成纸纤维浆料。
(3)将碳纳米管分散液和纸纤维浆料均匀混合,采用真空抽滤工艺制成碳纳米管-纸纤维复合导电纸,然后真空干燥去除水分。
(4)将硫溶解在苯或二流化碳等有机溶剂中,调节硫在有机溶剂中的溶度至5%-40%。
(5)将真空干燥后的碳纳米管-纸纤维复合导电纸浸入步骤(4)的硫的有机溶剂溶液中,待硫溶液对复合导电纸充分润湿后,取出吸附了硫溶液的纸张,再经真空干燥处理。
(6)干燥后的碳纳米管-纸纤维-硫三元正极材料在经过扎制和裁剪制成锂-硫电池正极极片。
本发明的产品可裁剪成需要的形状和大小,或者直接制造成特定的形状和大小的锂-硫电池正极极片产品。本发明充分利用新的工艺方法制造锂-硫电池正极,活性材料和集流体一体化制做,简化了锂-硫电池的制造工艺。该发明制备的碳纳米管/纸纤维复合导电纸中具有大量微小孔洞,和巨大表面积,硫元素很容易填充其中,从而提高硫在极片中的装载量和密度,提高锂-硫电池的能量密度。碳材料和硫具有很好的亲和性,硫吸附在碳纳米管表面,增加了硫和碳纳米管的接触界面,使得界面电阻大幅减小,电子的传输更为容易,电池的性能得以有效提高。
本发明所述的锂-硫电池正极的用途如下:(1)用做锌锰纸电池正极,(2)用作锂离子纸电池正极;(3)用于制造超级电容器;用作锂电池正极。
附图说明
附图1为本发明的正极极片的SEM照片。
具体实施方式
本发明将通过以下实施例作进一步说明。
实施例1。
(1)取经3000℃高温石墨化处理的1克碳纳米管加入500ml蒸馏水中,分别经高速剪切和砂磨处理1小时,使碳纳米管均匀分散在液体中。
(2)将1克纸纤维加入500ml蒸馏水中,高速剪切2小时,将纸纤维打碎并均匀分散在水溶液中,制成纸纤维浆料。
(3)将分散好的碳纳米管浆料及纸纤维浆料混合均匀,采用真空抽滤工艺制成碳纳米管-纸纤维复合导电纸,然后真空干燥去除水分。
(4)真空干燥后用对辊轧机将纸电池正极压实,制备成复合导电纸。
(5)配置含5%硫的苯溶液,然后将复合导电纸浸入苯溶液中10小时,取出真空干燥处理,裁剪成所需尺寸用于锂-硫电池正极制作。
实施例2。
(1)取经3000℃高温石墨化处理的2克碳纳米管加入500ml乙醇中,分别经高速剪切和砂磨处理1小时,使碳纳米管均匀分散在液体中。
(2)将1克纸纤维加入500ml l蒸馏水中,高速剪切2小时,将纸纤维打碎并均匀分散在水溶液中,制成纸浆。
(3)将分散好的碳纳米管浆料及纸纤维浆料混合均匀,采用真空抽滤工艺制成碳纳米管-纸纤维复合导电纸,然后真空干燥去除水分。
(4)真空干燥后用对辊轧机将纸电池正极压实,制备成复合导电纸。
(5)配置含20%硫的二硫化碳溶液,然后将复合导电纸浸入溶液中16小时,取出真空干燥处理,裁剪成所需尺寸用于锂-硫电池正极制作。
实施例3。
(1)取经3000℃高温石墨化处理的3克碳纳米管加入500ml蒸馏水中,分别经高速剪切和砂磨处理1小时,使碳纳米管均匀分散在液体中。
(2)将1克纸纤维加入500ml l蒸馏水中,高速剪切2小时,将纸纤维打碎并均匀分散在水溶液中,制成纸浆。
(3)将分散好的碳纳米管浆料及纸纤维浆料混合均匀,采用真空抽滤工艺制成碳纳米管-纸纤维复合导电纸,然后真空干燥去除水分。
(4)真空干燥后用对辊轧机将纸电池正极压实,制备成复合导电纸。
(5)配置含20%硫的苯溶液,然后将复合导电纸浸入苯溶液中18小时,然后取出真空干燥处理,裁剪成所需尺寸用于锂-硫电池正极制作。
Claims (1)
1.一种柔性锂-硫电池正极的制备方法,其特征是按以下步骤:
(1)碳纳米管经3000℃高温石墨化处理,然后将石墨化后的碳纳米管加入到蒸馏水、乙醇、苯、二甲苯或丙酮溶剂中,再经高速剪切和砂磨机分散处理,制成碳纳米管分散液;
(2)用高速剪分散设备将纸纤维粉碎和打散,制成纸纤维浆料;
(3)将碳纳米管分散液和纸纤维浆料均匀混合,采用真空抽滤工艺制成碳纳米管-纸纤维复合导电纸,然后真空干燥去除水分;
(4)将硫溶解在苯或二流化碳有机溶剂中,调节硫在有机溶剂中的溶度至5%-40%;
(5)将真空干燥后的碳纳米管-纸纤维复合导电纸浸入步骤(4)的硫的有机溶剂溶液中,待硫溶液对复合导电纸充分润湿后,取出吸附了硫溶液的纸张,再经真空干燥处理;
(6)干燥后的碳纳米管-纸纤维-硫三元正极材料在经过扎制和裁剪制成锂-硫电池正极极片。
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Cited By (5)
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CN105449167A (zh) * | 2015-12-25 | 2016-03-30 | 南昌大学 | 一种用碳纳米管纸作集流体的锂离子电池正极极片的制备方法 |
CN106374113A (zh) * | 2016-10-31 | 2017-02-01 | 南昌大学 | 石墨化碳纳米管柔性膜作锂硫电池集流体制备锂硫电池的方法 |
CN108987796A (zh) * | 2018-09-10 | 2018-12-11 | 江西克莱威纳米碳材料有限公司 | 一种柔性锂离子电池及其制备方法 |
CN109167093A (zh) * | 2018-09-03 | 2019-01-08 | 江西克莱威纳米碳材料有限公司 | 一种羟基化晶须碳纳米管纸及其制备方法和一种锂硫电池 |
CN113106782A (zh) * | 2021-03-26 | 2021-07-13 | 华南理工大学 | 一种负载银纳米线的柔性导电纸及其制备方法与应用 |
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CN105449167A (zh) * | 2015-12-25 | 2016-03-30 | 南昌大学 | 一种用碳纳米管纸作集流体的锂离子电池正极极片的制备方法 |
CN106374113A (zh) * | 2016-10-31 | 2017-02-01 | 南昌大学 | 石墨化碳纳米管柔性膜作锂硫电池集流体制备锂硫电池的方法 |
CN109167093A (zh) * | 2018-09-03 | 2019-01-08 | 江西克莱威纳米碳材料有限公司 | 一种羟基化晶须碳纳米管纸及其制备方法和一种锂硫电池 |
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CN113106782A (zh) * | 2021-03-26 | 2021-07-13 | 华南理工大学 | 一种负载银纳米线的柔性导电纸及其制备方法与应用 |
CN113106782B (zh) * | 2021-03-26 | 2022-05-24 | 华南理工大学 | 一种负载银纳米线的柔性导电纸及其制备方法与应用 |
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