CN116247169B - 一种含Se掺杂的CoS2为负极的钠离子电池制备方法 - Google Patents
一种含Se掺杂的CoS2为负极的钠离子电池制备方法 Download PDFInfo
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- 229910001415 sodium ion Inorganic materials 0.000 title claims abstract description 28
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 17
- 238000009210 therapy by ultrasound Methods 0.000 claims abstract description 12
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims abstract description 10
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 8
- 239000002131 composite material Substances 0.000 claims abstract description 8
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 8
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- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000002033 PVDF binder Substances 0.000 claims abstract description 6
- 239000006230 acetylene black Substances 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- ZBYYWKJVSFHYJL-UHFFFAOYSA-L cobalt(2+);diacetate;tetrahydrate Chemical compound O.O.O.O.[Co+2].CC([O-])=O.CC([O-])=O ZBYYWKJVSFHYJL-UHFFFAOYSA-L 0.000 claims abstract description 6
- BVTBRVFYZUCAKH-UHFFFAOYSA-L disodium selenite Chemical compound [Na+].[Na+].[O-][Se]([O-])=O BVTBRVFYZUCAKH-UHFFFAOYSA-L 0.000 claims abstract description 6
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- YUKQRDCYNOVPGJ-UHFFFAOYSA-N thioacetamide Chemical compound CC(N)=S YUKQRDCYNOVPGJ-UHFFFAOYSA-N 0.000 claims abstract description 6
- DLFVBJFMPXGRIB-UHFFFAOYSA-N thioacetamide Natural products CC(N)=O DLFVBJFMPXGRIB-UHFFFAOYSA-N 0.000 claims abstract description 6
- SBLRHMKNNHXPHG-UHFFFAOYSA-N 4-fluoro-1,3-dioxolan-2-one Chemical compound FC1COC(=O)O1 SBLRHMKNNHXPHG-UHFFFAOYSA-N 0.000 claims abstract description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 4
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000011248 coating agent Substances 0.000 claims abstract description 4
- 238000000576 coating method Methods 0.000 claims abstract description 4
- 239000011889 copper foil Substances 0.000 claims abstract description 4
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims abstract description 4
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims abstract description 4
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 239000007772 electrode material Substances 0.000 description 4
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1397—Processes of manufacture of electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
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- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/054—Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
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- H—ELECTRICITY
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- H01M10/058—Construction or manufacture
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/581—Chalcogenides or intercalation compounds thereof
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- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
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- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
本发明公开了一种含Se掺杂的CoS2为负极的钠离子电池制备方法,S1:将氧化石墨烯悬浊液加入四水合乙酸钴和十二烷基硫酸钠,加入硫代乙酰胺,超声后加入亚硒酸钠再超声;S2:将溶液转移至四氟乙烯反应釜中反应;S3:洗涤三次后冷冻干燥,得到CoSeS2/C;S4:与聚偏氟乙烯和乙炔黑混合研磨,然后加入1‑甲基‑2吡咯烷酮搅拌成浆料状,涂在铜箔上制成电极片,真空烘干;S5:将钠离子电池负极、钠片、玻璃纤维膜与高氯酸钠、碳酸二甲酯、碳酸乙烯酯、碳酸甲乙酯和氟代碳酸乙烯酯的混合液组装。本发明制备复合材料CoSeS2/C,结构稳定、形貌均匀,具有良好的循环倍率性能,工艺流程短,便于操作。
Description
技术领域
本发明涉及一种电池负极材料的制备方法,具体为一种含Se掺杂的CoS2为负极的钠离子电池制备方法,属于电池材料制备领域。
背景技术
近年来,锂离子电池由于高能量密度和长循环寿命等优点,已成为了众多能量存储设备的重要电源。然而,锂元素的资源稀少、价格昂贵和安全性差等问题制约着锂离子电池的大规模应用。与锂元素相比,钠元素的储量丰富,价格低廉,而且和锂元素处于同一主族,具有非常相似的储能机理,在大规模储能中极具应用前景。过渡金属硫化物(TMDs)由于大的理论容量和低廉的成本,是极具应用潜力的钠离子电池负极材料之一。另外,与过渡金属氧化物相比,过渡金属硫化物中存在的M-S键具有更低的键能和反应势垒,有利于转化反应,从而提高钠离子的扩散动力学。
二硫化钴(CoS2)作为一种与黄铁矿同晶结构的过渡金属硫化物,因其高的理论容量(870mAh g-1)和丰富的储量,非常适合作为下一代高能量的钠离子电池负极材料。但是与其他硫化物一样,二硫化钴在钠离子的嵌入/脱出过程中伴随着大的体积膨胀,致使电极材料在充放电过程中损耗过快,造成循环寿命的严重退化和电极动力学缓慢;同时,本征二硫化钴的电导率过低,严重影响电极的循环和倍率性能,且硫化物的表面原子惰性,会导致其电化学活性的降低。
近年来,有研究通过制备同晶黄铁矿/碳基质复合材料提高了钠离子电池的存储性能,其中碳基体可以用来提供快速的电子传递,同时作为缓冲层来适应同晶黄铁矿材料CoS2的体积变化。石墨烯等碳质材料具有较大的比表面积和良好的导电性,常被用于构建碳基体,负载活性纳米颗粒作为电极材料。另外,过渡金属硫化物与石墨烯耦合时可以产生较大的界面面积,这极大地缩短了离子扩散路径,在界面创建高效可达的通道,促进Na+扩散动力学。然而,通常CoS2的合成和石墨烯纳米片的合成是分开的,这导致了合成过程的复杂化。除此之外,引入石墨烯对于缓解体积膨胀和电导率的提高有显著作用,但是对于电极材料电化学活性的提高有限。因此,需要一种更加有效的方法制备出晶黄铁矿/碳基质复合材料,来开发更高性能的钠离子电池阳极。
发明内容
针对上述现有技术存在的问题,本发明的目的是提供一种含Se掺杂的CoS2为负极的钠离子电池制备方法,以解决现有同晶黄铁矿/碳基质复合材料合成过程复杂化和电化学活性较低的问题。
为实现上述目的,本发明采用的技术方案是:
一种含Se掺杂的CoS2为负极的钠离子电池制备方法,包括以下步骤:
S1:将氧化石墨烯悬浊液超声至完全均匀后,加入四水合乙酸钴和十二烷基硫酸钠,超声15min;加入硫代乙酰胺,超声15min;之后加入亚硒酸钠,超声15min;
S2:将得到的超声均匀的溶液转移至四氟乙烯反应釜中,在180℃下反应12h,随炉冷却;
S3:用无水乙醇和去离子水交替抽滤洗涤三次后冷冻干燥48小时,得到三维石墨烯负载Se掺杂CoS2颗粒的复合材料,即CoSeS2/C;
S4:将制得的CoSeS2/C与聚偏氟乙烯和乙炔黑混合研磨,然后加入1-甲基-2吡咯烷酮搅拌成浆料状,均匀的涂在铜箔上制成电极片,60-70℃真空烘干,得到钠离子电池负极;
S5:在无水无氧的手套箱中,将制备得到的钠离子电池负极、钠片、玻璃纤维膜与高氯酸钠、碳酸二甲酯、碳酸乙烯酯、碳酸甲乙酯和氟代碳酸乙烯酯的混合液组装,得到钠电池。
更进一步的,步骤S1中四水合乙酸钴、十二烷基硫酸钠、硫代乙酰胺和亚硒酸钠的质量比为5:1:6:2.8。
更进一步的,步骤S1中氧化石墨烯悬浊液的浓度为1mg/ml,且氧化石墨烯悬浊液的体积与十二烷基硫酸钠的质量之比为2000ml:1g。
更进一步的,步骤S4中CoSeS2/C与聚偏氟乙烯和乙炔黑的质量比为8:1:1。
更进一步的,步骤S4中1-甲基-2吡咯烷酮与十二烷基硫酸钠的质量比为1.2:1。
本发明制备方法的有益效果为:
(1)本发明通过一步水热方法制备在三维石墨烯上原位负载CoSeS2颗粒的复合材料CoSeS2/C,该材料的结构稳定、形貌均匀,性能更加稳定;
(2)本发明利用Se原子调控缺陷浓度,增加活性位点,改善Co S2电化学活性;构筑三维石墨烯有助于提高电导率,同时实现空间限域,设计的CoSeS2/C电极材料应用于钠离子电池阳极,具有良好的循环倍率性能;
(3)本发明所述制备工艺流程短,实验方法简单便于操作,易于控制且重复性好,适用性强,为同晶黄铁矿材料应用于钠离子电池负极提供了新的思路。
附图说明
图1为CoSeS2/C材料的X射线衍射图;
图2为CoSeS2/C材料的扫描电镜图;
图3为CoSeS2/C电极在0.1Ag-1电流密度下的循环性能图;
图4为CoSeS2/C电极在不同电流密度下的倍率性能图。
具体实施方式
下面结合附图对本发明作进一步详细说明。
一种含Se掺杂的CoS2为负极的钠离子电池制备方法,包括以下步骤:
S1:将25ml氧化石墨烯悬浊液超声至完全均匀后,加入0.0625g四水合乙酸钴和0.0125g十二烷基硫酸钠,超声15min;加入0.075g硫代乙酰胺,超声15min;之后加入0.035g亚硒酸钠,超声15min;
S2:将得到的超声均匀的溶液转移至50ml四氟乙烯反应釜中,在180℃下反应12h,随炉冷却;
S3:用无水乙醇和去离子水交替抽滤洗涤三次后冷冻干燥48小时,得到三维石墨烯负载Se掺杂CoS2颗粒的复合材料,即CoSeS2/C;
S4:将制得的CoSeS2/C与聚偏氟乙烯和乙炔黑按质量比8:1:1混合研磨,然后加入0.015g 1-甲基-2吡咯烷酮搅拌成浆料状,均匀的涂在铜箔上制成电极片,60-70℃真空烘干,得到钠离子电池负极;
S5:在无水无氧的手套箱中,将制备得到的钠离子电池负极、钠片、玻璃纤维膜与高氯酸钠、碳酸二甲酯、碳酸乙烯酯、碳酸甲乙酯和氟代碳酸乙烯酯的混合液组装,得到钠电池。
对制备得到的CoSeS2/C材料做X射线衍射图和扫描电镜图,如图1、2所示,CoSeS2材料颗粒的粒径为40-60nm,且形貌均匀,这样制备的材料结构稳定、可靠。图3为CoSeS2/C电极在0.1Ag-1电流密度下的循环性能图,如图3所示,在0-3V电压范围内,0.1Ag-1电流密度下,经过100圈循环后,放电比容量可达350mAh g-1。如图4所示,该电极在5Ag-1的电流密度下有285.5mAh g-1的可逆容量。
Claims (5)
1.一种含Se掺杂的CoS2为负极的钠离子电池制备方法,其特征在于,包括以下步骤:
S1:将氧化石墨烯悬浊液超声至完全均匀后,加入四水合乙酸钴和十二烷基硫酸钠,超声15min;加入硫代乙酰胺,超声15min;之后加入亚硒酸钠,超声15min;
S2:将得到的超声均匀的溶液转移至四氟乙烯反应釜中,在180℃下反应12h,随炉冷却;
S3:用无水乙醇和去离子水交替抽滤洗涤三次后冷冻干燥48小时,得到三维石墨烯负载Se掺杂CoS2颗粒的复合材料,即CoSeS2/C;
S4:将制得的CoSeS2/C与聚偏氟乙烯和乙炔黑混合研磨,然后加入1-甲基-2吡咯烷酮搅拌成浆料状,均匀的涂在铜箔上制成电极片,60-70℃真空烘干,得到钠离子电池负极;
S5:在无水无氧的手套箱中,将制备得到的钠离子电池负极、钠片、玻璃纤维膜与高氯酸钠、碳酸二甲酯、碳酸乙烯酯、碳酸甲乙酯和氟代碳酸乙烯酯的混合液组装,得到钠电池。
2.根据权利要求1所述的一种含Se掺杂的CoS2为负极的钠离子电池制备方法,其特征在于,步骤S1中四水合乙酸钴、十二烷基硫酸钠、硫代乙酰胺和亚硒酸钠的质量比为5:1:6:2.8。
3.根据权利要求1所述的一种含Se掺杂的CoS2为负极的钠离子电池制备方法,其特征在于,步骤S1中氧化石墨烯悬浊液的浓度为1mg/ml,且氧化石墨烯悬浊液的体积与十二烷基硫酸钠的质量之比为2000ml:1g。
4.根据权利要求1或2所述的一种含Se掺杂的CoS2为负极的钠离子电池制备方法,其特征在于,步骤S4中CoSeS2/C与聚偏氟乙烯和乙炔黑的质量比为8:1:1。
5.根据权利要求1或2所述的一种含Se掺杂的CoS2为负极的钠离子电池制备方法,其特征在于,步骤S4中1-甲基-2吡咯烷酮与十二烷基硫酸钠的质量比为1.2:1。
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