CN113429570B - 一种锂硫电池用磺化聚酰胺粘结剂、正极片 - Google Patents
一种锂硫电池用磺化聚酰胺粘结剂、正极片 Download PDFInfo
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- JDZCKJOXGCMJGS-UHFFFAOYSA-N [Li].[S] Chemical compound [Li].[S] JDZCKJOXGCMJGS-UHFFFAOYSA-N 0.000 title claims abstract description 32
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- 239000006230 acetylene black Substances 0.000 description 4
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 4
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- 229920003235 aromatic polyamide Polymers 0.000 description 4
- 229910001628 calcium chloride Inorganic materials 0.000 description 4
- 239000001110 calcium chloride Substances 0.000 description 4
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 4
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- MBJAPGAZEWPEFB-UHFFFAOYSA-N 5-amino-2-(4-amino-2-sulfophenyl)benzenesulfonic acid Chemical compound OS(=O)(=O)C1=CC(N)=CC=C1C1=CC=C(N)C=C1S(O)(=O)=O MBJAPGAZEWPEFB-UHFFFAOYSA-N 0.000 description 3
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- RTBFRGCFXZNCOE-UHFFFAOYSA-N 1-methylsulfonylpiperidin-4-one Chemical compound CS(=O)(=O)N1CCC(=O)CC1 RTBFRGCFXZNCOE-UHFFFAOYSA-N 0.000 description 2
- 239000004953 Aliphatic polyamide Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 2
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- JFCQEDHGNNZCLN-UHFFFAOYSA-N anhydrous glutaric acid Natural products OC(=O)CCCC(O)=O JFCQEDHGNNZCLN-UHFFFAOYSA-N 0.000 description 2
- 239000006256 anode slurry Substances 0.000 description 2
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- 239000003054 catalyst Substances 0.000 description 2
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- IIPYXGDZVMZOAP-UHFFFAOYSA-N lithium nitrate Chemical compound [Li+].[O-][N+]([O-])=O IIPYXGDZVMZOAP-UHFFFAOYSA-N 0.000 description 2
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- WLJVNTCWHIRURA-UHFFFAOYSA-N pimelic acid Chemical compound OC(=O)CCCCCC(O)=O WLJVNTCWHIRURA-UHFFFAOYSA-N 0.000 description 2
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- 125000006091 1,3-dioxolane group Chemical group 0.000 description 1
- -1 MXene Chemical compound 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
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- 229910021389 graphene Inorganic materials 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 description 1
- GLNWILHOFOBOFD-UHFFFAOYSA-N lithium sulfide Chemical compound [Li+].[Li+].[S-2] GLNWILHOFOBOFD-UHFFFAOYSA-N 0.000 description 1
- QSZMZKBZAYQGRS-UHFFFAOYSA-N lithium;bis(trifluoromethylsulfonyl)azanide Chemical compound [Li+].FC(F)(F)S(=O)(=O)[N-]S(=O)(=O)C(F)(F)F QSZMZKBZAYQGRS-UHFFFAOYSA-N 0.000 description 1
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 description 1
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- 229910052751 metal Inorganic materials 0.000 description 1
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G69/00—Macromolecular compounds obtained by reactions forming a carboxylic amide link in the main chain of the macromolecule
- C08G69/42—Polyamides containing atoms other than carbon, hydrogen, oxygen, and nitrogen
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Abstract
发明公开了一种锂硫电池用磺化聚酰胺粘结剂,由2,6‑萘二羧酸、脂肪族二酸和芳香二胺直接缩聚反应得到。本发明还公开了一种正极片,包括集流体和粘附在集流体表面的正极材料,所述正极材料包括上述锂硫电池用磺化聚酰胺粘结剂。本发明具有良好的粘结性能,能有效抑制极片在充放电过程中的体积变化;且能避免穿梭效应,提高电池循环性能。
Description
技术领域
本发明涉及粘结剂技术领域,尤其涉及一种锂硫电池用磺化聚酰胺粘结剂、正极片。
背景技术
锂硫电池是锂电池的一种。锂硫电池是以含硫物质作为电池正极,金属锂作为负极的一种锂电池。硫元素来源广泛,价格低廉、且环境友好。锂硫电池的理论比容量和电池理论比能量较高,分别达到1675mAh/g和2600Wh/kg,远远高于商业上广泛应用的钴酸锂电池的容量(<150mAh/g)。
锂硫电池在放电过程中产生的易溶于电解液的长链多硫化物,容易产生“穿梭效应”,会造成容量衰减;且硫和硫化锂的密度分别为2.07g/ml和1.66g/ml,在充放电过程中有高达79%的体积膨胀/收缩,这种膨胀会导致正极形貌和结构的改变,导致硫与集流体的脱离,从而造成容量的衰减。
粘结剂是锂硫电池正极材料中重要的组成部分,其用量虽少,但对电极的结构和形貌具有至关重要的影响。目前锂硫电池正极用粘结剂有聚偏氟乙烯(PVDF)等。但是其聚偏氟乙烯对极片组分与集流体的粘结性能不高,对“穿梭效应”、充放电过程中体积变化等问题的改善效果并不太好。
发明内容
基于背景技术存在的技术问题,本发明提出了一种锂硫电池用磺化聚酰胺粘结剂及其制备方法、锂硫电极正极片,本发明具有良好的粘结性能,能有效抑制极片在充放电过程中的体积变化;且能避免穿梭效应,提高电池循环性能。
本发明提出了一种锂硫电池用磺化聚酰胺粘结剂,由2,6-萘二羧酸、脂肪族二酸和芳香二胺直接缩聚反应得到,其结构如式(I)所示:
其中,R1为如下基团中的任意一种:
优选地,n为40-700中的任一整数,m为60-1000中的任一整数。
上述直接缩聚反应为Yamazaki-Higashi直接缩聚反应,其具体步骤可以为:在惰性气体氛围中,在吡啶、亚磷酸三苯酯、催化剂(氯化钙或/和氯化锂)、三乙胺存在条件下,二酸和芳香二胺进行直接缩聚反应得到,其中,反应溶剂优选N-甲基吡咯烷酮;吡啶、亚磷酸三苯酯、三乙胺的体积比优选1:1.1:0.9;芳香二胺、催化剂的摩尔比优选1:2.2;芳香二胺、吡啶的摩尔比优选1:6;直接缩聚反应的程序优选:于80℃反应2h,100℃反应12h,110℃反应12h。
优选地,脂肪族二酸为戊二酸、己二酸、庚二酸、壬二酸、辛二酸、癸二酸中的一种。
优选地,芳香二胺为具有如下结构式的物质中的任意一种:
优选地,2,6-萘二羧酸、脂肪族二酸的摩尔比为1.8-2.2:3。
优选地,芳香二胺的摩尔数、2,6-萘二羧酸和脂肪族二酸的摩尔总数的比值为1-1.05:1。
本发明还提出了一种正极片,包括集流体和粘附在集流体表面的正极材料,所述正极材料包括上述锂硫电池用磺化聚酰胺粘结剂。
优选地,所述正极材料还包括含硫活性物质和导电剂。
优选地,含硫活性物质、导电剂和上述锂硫电池用磺化聚酰胺粘结剂的重量比为3:1.7-1.9:0.7-0.9。
上述导电剂可以为:石墨烯、碳纳米管、导电炭黑、MXene、乙炔黑、碳纤维、碳纳米纤维、金属涂覆的碳纤维等。
有益效果:
本发明通过对芳香聚酰胺进行磺化处理,并引入脂肪族聚酰胺结构,改善芳香聚酰胺的溶解性,将其作为粘结剂使用,其具有良好的粘结性能,可以提高含硫活性物质、导电剂和集流体之间良好的接触,防止活性物质和导电剂的脱落;并且脂肪族聚酰胺结构的引入,使得聚酰胺具有良好粘结性能的同时,具有适宜的柔韧性,可以有效抑制锂硫正极片在充放电过程中的体积膨胀问题;另外聚酰胺中具有较多的酰胺活性基团,可以固定多硫化物,避免穿梭效应;本发明可以提高锂硫电池的循环性能。
具体实施方式
下面,通过具体实施例对本发明的技术方案进行详细说明。
实施例1
一种锂硫电池用磺化聚酰胺粘结剂,其制备方法包括如下步骤:
在氮气氛围中,将0.25g氯化钙、0.1g氯化锂、1ml吡啶、10ml N-甲基吡咯烷酮混匀,加热搅拌至溶解,冷却至室温,然后加入0.8mmol 2,6-萘二羧酸、1.2mmol己二酸、2.06mmol 4,4’-二氨基二苯醚-2,2’-二磺酸、1.1ml亚磷酸三苯酯、0.9ml三乙胺混匀,然后于80℃搅拌保温反应2h,接着于100℃搅拌反应12h,再于110℃搅拌反应12h,然后冷却至室温,缓慢倒入甲醇中,浸泡12h后,过滤,用去离子水浸泡12h,过滤,真空干燥得到锂硫电池用磺化聚酰胺粘结剂。
实施例1所得粘结剂的结构式如下所示:
实施例2
一种锂硫电池用磺化聚酰胺粘结剂,其制备方法包括如下步骤:
在氮气氛围中,将0.25g氯化钙、0.1g氯化锂、1ml吡啶、10ml N-甲基吡咯烷酮混匀,加热搅拌至溶解,冷却至室温,然后加入0.75mmol 2,6-萘二羧酸、1.25mmol戊二酸、2mmol 4,4’-二氨基二苯醚-2,2’-二磺酸、1.1ml亚磷酸三苯酯、0.9ml三乙胺混匀,然后于80℃搅拌保温反应2h,接着于100℃搅拌反应12h,再于110℃搅拌反应12h,然后冷却至室温,缓慢倒入甲醇中,浸泡12h后,过滤,用去离子水浸泡12h,过滤,真空干燥得到锂硫电池用磺化聚酰胺粘结剂。
实施例2所得粘结剂的结构式如下所示:
实施例3
一种锂硫电池用磺化聚酰胺粘结剂,其制备方法包括如下步骤:
在氮气氛围中,将0.25g氯化钙、0.1g氯化锂、1ml吡啶、10ml N-甲基吡咯烷酮混匀,加热搅拌至溶解,冷却至室温,然后加入0.85mmol 2,6-萘二羧酸、1.15mmol癸二酸、2mmol 4,4’-二氨基二苯醚-2,2’-二磺酸、1.1ml亚磷酸三苯酯、0.9ml三乙胺混匀,然后于80℃搅拌保温反应2h,接着于100℃搅拌反应12h,再于110℃搅拌反应12h,然后冷却至室温,缓慢倒入甲醇中,浸泡12h后,过滤,用去离子水浸泡12h,过滤,真空干燥得到锂硫电池用磺化聚酰胺粘结剂。
实施例3所得粘结剂的结构式如下所示:
实施例4
一种锂硫电池用磺化聚酰胺粘结剂,芳香二胺为4,4'-二氨基-2,2'-联苯二磺酸,其他同实施例1,所得粘结剂的结构式如下所示:
实施例5
一种锂硫电池用磺化聚酰胺粘结剂,芳香二胺为4,4'-二氨基-2,2'-联苯二磺酸,其他同实施例2,所得粘结剂的结构式如下所示:
实施例6
一种锂硫电池用磺化聚酰胺粘结剂,芳香二胺为4,4'-二氨基-2,2'-联苯二磺酸,其他同实施例3,所得粘结剂的结构式如下所示:
实验
取实施例1-6制得的粘结剂,用N-甲基吡咯烷酮作为溶剂,分别配置质量分数为1%的粘结剂溶液;然后按照升华硫粉、乙炔黑、粘结剂的重量比为3:1.8:0.8,称取升华硫粉和乙炔黑,分别加入到粘结剂溶液中搅拌8h混匀得到6个正极浆料,然后将正极浆料分别均匀涂覆在涂炭铝箔表面,真空干燥,然后冲压得到6个正极圆片(直径14mm);并以传统粘结剂聚偏氟乙烯(PVDF),按照相同方法制备对照正极片。
分别取上述正极片,在氩气氛围的手套箱中组装获得扣式电池(隔膜为PE/PP/PE复合膜,电解液为:1wt%硝酸锂溶液、1mol/l双三氟甲烷磺酰亚胺锂,溶剂为等体积的1,3-二氧戊环和乙二醇二甲醚)。
对各个扣式电池进行性能检测,结果如表1所示。
表1检测结果
以上所述,仅为本发明较佳的具体实施方式,但本发明的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,根据本发明的技术方案及其发明构思加以等同替换或改变,都应涵盖在本发明的保护范围之内。
Claims (6)
2.根据权利要求1所述锂硫电池用磺化聚酰胺粘结剂,其特征在于,2,6-萘二羧酸、脂肪族二酸的摩尔比为1.8-2.2:3。
3.根据权利要求1所述锂硫电池用磺化聚酰胺粘结剂,其特征在于,芳香二胺的摩尔数、2,6-萘二羧酸和脂肪族二酸的摩尔总数的比值为1-1.05:1。
4.一种正极片,其特征在于,包括集流体和粘附在集流体表面的正极材料,所述正极材料包括如权利要求1-3任一项所述锂硫电池用磺化聚酰胺粘结剂。
5.根据权利要求4所述正极片,其特征在于,所述正极材料还包括含硫活性物质和导电剂。
6.根据权利要求5所述正极片,其特征在于,含硫活性物质、导电剂和锂硫电池用磺化聚酰胺粘结剂的重量比为3:1.7-1.9:0.7-0.9。
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