CN105206841B - 一种用于锂硫电池正极中的黄铁矿类添加剂 - Google Patents
一种用于锂硫电池正极中的黄铁矿类添加剂 Download PDFInfo
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Abstract
本发明公开了一种用于锂硫电池正极中的黄铁矿类添加剂。所述黄铁矿类添加剂通过机械研磨或液相过滤组装掺入正极材料骨架中,或利用化学作用锚定于正极材料骨架上;所述黄铁矿类添加剂包括VIII族金属的二硫化物、VIII族金属的二硒化物、VIII族金属的二碲化物以及FexCo1‑xS2和CoyNi1‑yS2;其中,0<x<1,0<y<1。本发明利用黄铁矿类物质的表面极性和半金属性,在锂硫电池正极中加速了多硫化物中间产物的氧化还原反应速率,从而提升了正极的容量和稳定性。
Description
技术领域
本发明属于电化学技术领域,具体涉及一种用于锂硫电池正极中的黄铁矿类添加剂。
背景技术
移动电子设备、电动汽车和大规模储能等领域的发展对储能系统的能量密度提出了更高的要求,而常见的商用二次电池(铅酸电池、锂离子电池等)较低的能量密度(小于200Wh/kg)已无法适应此需求。近年来,锂硫电池以其高达2600Wh/kg的能量密度受到广泛关注。硫作为正极活性材料,具有1672mAh/g的高理论容量,且具备廉价、易获取、环境友好等优势。
由于硫本身的绝缘性,向锂硫电池正极中引入纳米化导电剂成为了重要的方法。纳米碳材料是这类导电剂中最常用的一种。纳米碳的高导电性、高比表面积和高孔体积使其与硫的复合成为了锂硫电池正极领域最受关注的研究思路,这一思路也较为有效地发挥了硫的容量优势。然而硫在充放电过程中产生的中间产物(多硫化物)可以溶于电解液并向外扩散。一方面,多硫化物脱离导电骨架后难以被利用,造成容量衰减;另一方面,多硫化物与锂发生副反应,造成电池循环效率降低。
抑制多硫化物的溶解和扩散是提升正极循环性能的核心。一些研究者通过对硫进行包覆以阻隔多硫化物的扩散。例如:Cui等在纳米硫颗粒外包覆TiO2形成空心核壳结构,阻碍多硫化物向外扩散,提升了正极的容量稳定性(She ZW et al.,Nat.Commun.,2013,4,1331);Manthiram等人以TiO2空心纳米球为模板,将聚多巴胺碳化形成中空碳球,其中间孔洞可用于储存硫并限制多硫化物的逸出(Zhou G et al.,Adv.Energy.Mater.2015,10.1002/aenm.201402263)。也有研究者利用极性物质对多硫化物的化学吸附限制多硫化物的向外迁移。Wang等人向介孔碳材料中掺入氮元素,提高了导电基体的表面极性,强化多硫化物的限域作用从而提升正极的循环稳定性(Song JX et al.,Adv.Funct.Mater.,2014,24(9),1243-1250)。尽管如此,上述物理包覆和化学吸附的方法仍无法实现接近实用化的正极性能。
近期,有研究者着眼于强化多硫化物氧化还原反应以提高正极循环性能。如果多硫化物能更快地参与氧化还原反应,那么其在电解液中的浓度将减小,从而其扩散也将削弱。例如,Nazar等人采用Magnéli相Ti4O7作为正极基体,与多硫化物产生强相互作用,加强多硫化物在其表面的反应活性,使得未参与反应而停留于电解液中的多硫化物相对减少,从而提升了循环稳定性(Pang Q et al.,Nat.Commun.,2014,5,4759)。然而这些基体材料合成复杂,且导电性偏低,对电池的容量和倍率性能不利。如果以纳米碳和硫的复合物为基础,向其中添入易获取的导电无机物,即可便捷而有效地削弱多硫化物扩散,提升锂硫电池正极的容量和循环性能,这将会对锂硫电池更广泛的应用产生积极的促进作用。
发明内容
本发明提供了一种用于锂硫电池正极中的黄铁矿类添加剂,具体技术方案如下:
一种用于锂硫电池正极中的黄铁矿类添加剂:所述黄铁矿类添加剂通过机械研磨或液相过滤组装掺入正极材料骨架中,或利用化学作用锚定于正极材料骨架上;
所述黄铁矿类添加剂包括VIII族金属的二硫化物、VIII族金属的二硒化物、VIII族金属的二碲化物以及FexCo1-xS2和CoyNi1-yS2;其中,0<x<1,0<y<1。
进一步地,所述VIII族金属的二硫化物为FeS2,CoS2,NiS2,RhS2或IrS2;所述VIII族金属的二硒化物为FeSe2,CoSe2或NiSe2。
所述添加剂在锂硫电池正极中的质量分数为0.1-50%。
所述添加剂通过以下方法制备:天然矿物直接研磨法、直接加热化合法、水热法或常温液相合成法。
所述正极材料骨架为硫和纳米碳材料组成的复合正极。
所述纳米碳材料为微孔碳材料、介孔碳材料、多级孔纳米碳、石墨烯及其衍生物、碳纳米管、碳纳米纤维及其杂化物。
本发明的原理是:本发明利用黄铁矿类物质的表面极性和半金属性,在锂硫电池正极中加速了多硫化物中间产物的氧化还原反应速率。在较少的加入量下,黄铁矿类物质即可显著改善纳米碳材料或导电高分子基体与多硫化物不亲和的问题。
本发明具有如下优点及突出效果:本发明向纳米碳-硫复合正极中引入黄铁矿类物质,加快了多硫化物的电化学反应速率,从而提升了正极的容量和稳定性。所述黄铁矿类添加剂获取容易、制备方便、价格低廉,甚至可以通过黄铁矿类矿石直接研磨得到。该添加剂可以与多种碳材料适配,如微孔碳材料、介孔碳材料、多级孔纳米碳、石墨烯及其衍生物、碳纳米管、碳纳米纤维及其杂化物等,且适配方法可调,包括直接机械混入、液相组装或化学结合等。因此,本发明有较强的实用性和可操作性。
具体实施方式
从以下实施例可进一步理解本发明,但本发明不仅仅局限于以下实施例。
实施例1
将天然黄铁矿FeS2研磨至毫米级颗粒,通过共研磨混入硫/介孔碳复合物中作为正极材料,其中FeS2质量分数为5%。同时采用金属锂片作为负极,聚乙烯膜作为隔膜,二(三氟甲基磺酰)亚胺锂的1,3-二氧戊环、乙二醇二甲醚溶液作为电解液,制作锂硫电池。在0.05C的充放电速率下,加入FeS2的正极初始容量达1328mAh/g,前100个循环单圈衰减率约0.06%。若将FeS2替换为等质量介孔碳,则初始容量仅为1045mAh/g,且容量衰减率更高(约0.25%)。
实施例2
利用水热法在氧化石墨烯片层上合成CoS2,得到相互结合的CoS2-氧化石墨烯复合物,再与硫复合形成正极材料,其中CoS2质量分数为15%。同时采用金属锂片作为负极,聚丙烯膜作为隔膜,二(三氟甲基磺酰)亚胺锂、硝酸锂的乙二醇二甲醚溶液作为电解液,制作锂硫电池。在0.5C的充放电速率下,引入CoS2的正极初始容量达1285mAh/g,前1000个循环单圈衰减率约0.04%。若将CoS2替换为等质量氧化石墨烯,则初始容量仅为956mAh/g,且容量衰减率更高(约0.5%)。
实施例3
将纳米化镍与硫共热得到NiS2,与碳纳米管在溶剂中共分散后抽滤进行组装,再与硫复合得到正极,其中NiS2质量分数为50%。同时采用锂硼合金作为负极,聚丙烯-聚乙烯-聚丙烯多层膜作为隔膜,六氟磷酸锂的碳酸二甲酯、碳酸二乙酯溶液作为电解液,制作锂硫电池。在2.0C的充放电速率下,加入NiS2的正极初始容量达1054mAh/g,前2000个循环单圈衰减率约0.03%。若将NiS2替换为等质量碳纳米管,则初始容量仅为876mAh/g,且容量衰减率更高(约0.1%)。
实施例4
利用水热法合成Fe0.5Co0.5S2悬浊液,与纳米硫颗粒悬浮液混匀后过滤,滤饼与多孔炭黑共混用作正极,其中Fe0.5Co0.5S2质量分数为8%。同时采用金属锂片作为负极,聚丙烯膜作为隔膜,二(三氟甲基磺酰)亚胺锂、二(氟磺酰)亚胺锂的1,3-二氧戊环溶液作为电解液,制作锂硫电池。在1.0C的充放电速率下,引入Fe0.5Co0.5S2的正极初始容量达1123mAh/g,前500个循环单圈衰减率约0.05%。若将Fe0.5Co0.5S2替换为等质量多孔炭黑,则初始容量仅为866mAh/g,且容量衰减率更高(约0.6%)。
实施例5
将钴和硒直接共热得到CoSe2,与硫、化学气相生长石墨烯共同球磨得到正极材料,其中CoSe2质量分数为0.1%。同时采用金属锂片作为负极,聚乙烯膜作为隔膜,高氯酸锂的碳酸乙烯酯、碳酸二甲酯作为电解液,制作锂硫电池。在0.1C的充放电速率下,引入CoSe2的正极初始容量达1281mAh/g,前200个循环单圈衰减率约0.07%。若将CoSe2替换为等质量的石墨烯,则初始容量为1098mAh/g,且容量衰减率更高(约0.12%)。
实施例6
以水为溶剂,直接合成得到Co0.8Ni0.2S2悬液,逐滴加入硫/碳纳米纤维复合物,烘干后得到正极材料,其中Co0.8Ni0.2S2质量分数为25%。同时采用锂/石墨烯复合物作为负极,聚丙烯-聚乙烯-聚丙烯多层膜作为隔膜,硝酸锂、多硫化锂的三乙二醇二甲醚溶液作为电解液,制作锂硫电池。在5C的充放电速率下,引入Co0.8Ni0.2S2的正极初始容量达979mAh/g,前500个循环单圈衰减率约0.02%。若将Co0.8Ni0.2S2替换为等质量碳纳米纤维,则初始容量仅为561mAh/g,且容量衰减率更高(约0.4%)。
实施例7
利用水热法制备得到NiSe2,与多级孔碳、硫共同研磨后共热复合,其中CoSe2质量分数为10%。同时采用金属锂片作为负极,聚丙烯膜作为隔膜,二(三氟甲基磺酰)亚胺锂、硝酸锂的1,3-二氧戊环、乙二醇二甲醚溶液作为电解液,制作锂硫电池。在3.0C的充放电速率下,引入NiSe2的正极初始容量达994mAh/g,前1500个循环单圈衰减率约0.04%。若将NiSe2替换为等质量的多级孔碳,则初始容量为679mAh/g,且容量衰减率更高(约0.14%)。
实施例8
利用加热化合法制备得到RhS2,通过球磨掺入硫/微孔碳复合物中得到锂硫电池正极材料,其中RhS2质量分数为2%。同时采用锂硼合金作为负极,聚丙烯-聚乙烯-聚丙烯多层膜作为隔膜,二草酸硼酸锂、二(三氟甲基磺酰)亚胺锂的二甲基亚砜溶液作为电解液,制作锂硫电池。在0.02C的充放电速率下,引入RhS2的正极初始容量达1321mAh/g,前100个循环单圈衰减率约0.1%。若将RhS2替换为等质量的多级孔碳,则初始容量为1127mAh/g,且容量衰减率更高(约0.4%)。
实施例9
利用加热化合法制备得到IrS2,与硫、垂直阵列碳纳米管共热后分散抽滤得到柔性正极材料,其中IrS2质量分数为0.5%。同时采用金属锂片作为负极,聚丙烯膜作为隔膜,高氯酸锂的聚乙二醇二甲醚溶液作为电解液,制作锂硫电池。在1.5C的充放电速率下,引入IrS2的正极初始容量达1108mAh/g,前500个循环单圈衰减率约0.06%。若将IrS2替换为等质量的垂直阵列碳纳米管,则初始容量为956mAh/g,且容量衰减率更高(约0.2%)。
实施例10
利用水热法在纳米碳球中合成FeSe2,再与硫共热用作正极材料,其中FeSe2质量分数为12%。同时采用金属锂片作为负极,聚丙烯膜作为隔膜,六氟磷酸锂的碳酸乙烯酯、碳酸二甲酯、碳酸二乙酯溶液作为电解液,制作锂硫电池。在2.5C的充放电速率下,引入FeSe2的正极初始容量达1094mAh/g,前1000个循环单圈衰减率约0.04%。若将FeSe2替换为等质量纳米碳球,则初始容量仅为902mAh/g,且容量衰减率更高(约0.25%)。
Claims (5)
1.一种用于锂硫电池正极中的黄铁矿类添加剂,其特征在于,所述黄铁矿类添加剂通过机械研磨或液相过滤组装掺入正极材料骨架中,或利用化学作用锚定于正极材料骨架上;
所述黄铁矿类添加剂包括VIII族金属的二硫化物、VIII族金属的二硒化物或VIII族金属的二碲化物;
所述添加剂在锂硫电池正极材料中的质量分数为0.1-50%。
2.根据权利要求1所述的添加剂,其特征在于,所述VIII族金属的二硫化物为FeS2,CoS2,NiS2,RhS2,IrS2,FexCo1-xS2或CoyNi1-yS2,其中,0<x<1,0<y<1;所述VIII族金属的二硒化物为FeSe2,CoSe2或NiSe2。
3.根据权利要求1所述的添加剂,其特征在于,所述添加剂通过以下方法制备:天然矿物直接研磨法、直接加热化合法、水热法或常温液相合成法。
4.根据权利要求1所述的添加剂,其特征在于,所述正极材料骨架为硫和纳米碳材料组成的复合正极。
5.根据权利要求4所述的添加剂,其特征在于,所述纳米碳材料为微孔碳材料、介孔碳材料、多级孔纳米碳、石墨烯及其衍生物、碳纳米管、碳纳米纤维及其杂化物。
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