CN108878955B - 一种石墨烯钛酸锂电池 - Google Patents
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 35
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 33
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 33
- 239000003792 electrolyte Substances 0.000 claims abstract description 26
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- ZUOUZKKEUPVFJK-UHFFFAOYSA-N diphenyl Chemical compound C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 claims description 14
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 12
- 239000002904 solvent Substances 0.000 claims description 11
- FSSPGSAQUIYDCN-UHFFFAOYSA-N 1,3-Propane sultone Chemical compound O=S1(=O)CCCO1 FSSPGSAQUIYDCN-UHFFFAOYSA-N 0.000 claims description 7
- VAYTZRYEBVHVLE-UHFFFAOYSA-N 1,3-dioxol-2-one Chemical compound O=C1OC=CO1 VAYTZRYEBVHVLE-UHFFFAOYSA-N 0.000 claims description 7
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 claims description 7
- 239000011149 active material Substances 0.000 claims description 7
- 235000010290 biphenyl Nutrition 0.000 claims description 7
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- 229910003002 lithium salt Inorganic materials 0.000 claims description 7
- 159000000002 lithium salts Chemical class 0.000 claims description 7
- 239000011230 binding agent Substances 0.000 claims description 5
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 5
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 claims description 5
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- 238000002156 mixing Methods 0.000 claims description 4
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 3
- ZYXUQEDFWHDILZ-UHFFFAOYSA-N [Ni].[Mn].[Li] Chemical compound [Ni].[Mn].[Li] ZYXUQEDFWHDILZ-UHFFFAOYSA-N 0.000 claims description 2
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
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- FRMOHNDAXZZWQI-UHFFFAOYSA-N lithium manganese(2+) nickel(2+) oxygen(2-) Chemical compound [O-2].[Mn+2].[Ni+2].[Li+] FRMOHNDAXZZWQI-UHFFFAOYSA-N 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
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Abstract
本发明以含有高石墨化度的膨胀石墨烯膜为正极材料,钛酸锂为负极材料制备石墨烯钛酸锂电池,电解液包括电解质锂盐、碳酸乙烯酯、碳酸亚乙烯酯、丙磺酸内酯、双草酸硼酸酯、冠醚、联苯,以及溶剂。石墨烯在电极材料中分散均匀,提高了电极的电子导电性,石墨化膨胀石墨烯用于钛酸锂电池电极,提高电池比容量和倍率性能,有利于钛酸锂电池的商业化应用,而本发明的电解液也能够降低钛酸锂电池的内阻,提高电解液与钛酸锂材料的相容性,进而提高钛酸锂电池的倍率性能和安全性。
Description
技术领域
本发明属于电池领域,涉及一种石墨烯钛酸锂电池。
背景技术
石墨烯是由碳原子组成的二维单层层状材料。石墨烯具有优异的光学、电学、力学特性,在材料学、微纳加工、能源、生物医学和药物传递等方面具有重要的应用前景,被认为是一种未来革命性的材料。石墨烯自身拥有高强度、高导热率以及良好的气体阻隔性等特性,钛酸锂作为一种新的锂离子电池负极材料,在电池充放电过程中几乎没有结构变化,被称为“零应变材料”,在于结构变化较为严重的正极材料如锰酸锂、三元材料等配合制成锂离子电池时,能够抵消正极材料结构变化对电池性能的影响。但是钛酸锂材料的导电性较差,制成的电池内阻较大,在充放电过程中,如果充放电倍率较大,则在电池内部引起的发热较为严重,影响了钛酸锂电池的倍率性能和安全性能。目前已经有将石墨烯材料用于电池的尝试,但石墨烯价格昂贵,所得效果欠佳,无法工业化使用。而本发明针对上述问题将石墨烯材料与钛酸锂电池相结合对电池性能进行改进。
发明内容
本发明的目的是,提供一种石墨烯钛酸锂电池,解决现有技术中存在的问题,提高钛酸锂电池的倍率性能、安全性和使用性能。
本发明所采用的技术方案是:一种石墨烯钛酸锂电池,正极材料包括高石墨化度的膨胀石墨烯膜,负极材料含有钛酸锂,电解液组成为电解质锂盐、碳酸乙烯酯、碳酸亚乙烯酯、丙磺酸内酯、双草酸硼酸酯、冠醚、联苯,以及溶剂。
进一步地,电解液中各组分的质量份为:电解质锂盐15-25份、碳酸乙烯酯10-30份、碳酸亚乙烯酯10-15份、丙磺酸内酯5-8份、双草酸硼酸酯3-7份、冠醚1-5份和联苯3-8份,溶剂70-100份。
进一步的,电解液中所述溶剂由如下体积比的组分组成:碳酸乙烯酯:碳酸二甲酯:碳酸丙烯酯:碳酸甲乙酯=13-30:35-60:20-30:3-6。
进一步地,所述正极材料由活性材料、高石墨化度的膨胀石墨烯膜、活性材料和粘合剂组成,具体制备方法为:将膨胀石墨经2000-3000℃温度下保温5分钟-10小时后,混合活性材料及粘结剂,再经1.5-35MPa的压力压制成膜。
进一步地,所述正极材料中的活性材料为磷酸铁锂、锰酸锂或三元材料、镍锰酸锂中的一种。
本发明的有益效果在于:经高温石墨化处理的膨胀石墨烯,可以除去膨胀石墨烯中原有的非碳杂原子,提高膨胀石墨烯的石墨化度,同时,石墨烯在电极材料中分散均匀,提高了电极的电子导电性,石墨化膨胀石墨烯用于钛酸锂电池电极,提高电池比容量和倍率性能,有利于钛酸锂电池的商业化应用,而本发明的电解液也能够降低钛酸锂电池的内阻,提高电解液与钛酸锂材料的相容性,进而提高钛酸锂电池的倍率性能和安全性。
附图说明
图1为含膨胀石墨烯的正极材料扫描电镜图。
具体实施方式
实施例1:
一种石墨烯钛酸锂电池,正极材料由膨胀石墨烯经2500℃温度下保温5分钟后,混合锰酸锂及粘结剂,再经1.5-35MPa的压力压制成膜得到,负极材料含有钛酸锂,电解液中各组分的质量份为:电解质锂盐20份、碳酸乙烯酯15份、碳酸亚乙烯酯13份、丙磺酸内酯6份、双草酸硼酸酯6份、冠醚2份、联苯5份、溶剂为70份,其中溶剂由如下体积比的组分组成:碳酸乙烯酯:碳酸二甲酯:碳酸丙烯酯:碳酸甲乙酯=15:40:28:5。
将实施例1所得正极、隔膜、负极按次序叠放装配制成电芯,60℃干燥24h,装入电池壳体,注入27g上述电解液,浸润,封口,化成,分容,制得的石墨烯钛酸锂电池,内阻为0.4-0.8mΩ,循环次数超过10000次,针刺试验和挤压试验全部合格,倍率性能和安全性能都得到了大幅的提高。
实施例2:
一种石墨烯钛酸锂电池,正极材料由膨胀石墨烯经2500℃温度下保温60分钟后,混合磷酸铁锂及粘结剂,再经1.5-35MPa的压力压制成膜,负极材料含有钛酸锂,电解液中各组分的质量份为:电解质锂盐22份、碳酸乙烯酯13份、碳酸亚乙烯酯15份、丙磺酸内酯5份、双草酸硼酸酯6份、冠醚3份、联苯5份、溶剂为80份,其中溶剂由如下体积比的组分组成:碳酸乙烯酯:碳酸二甲酯:碳酸丙烯酯:碳酸甲乙酯=17:38:25:6。
将实施例2所得正极、隔膜、负极按次序叠放装配制成电芯,60℃干燥24h,装入电池壳体,注入27g上述电解液,浸润,封口,化成,分容,制得的石墨烯钛酸锂电池,内阻为0.4-0.8mΩ,循环次数超过10000次,针刺试验和挤压试验全部合格,倍率性能和安全性能都得到了大幅的提高。
实施例3:
一种石墨烯钛酸锂电池,正极材料由膨胀石墨烯经2500℃温度下保温15分钟后,混合镍锰酸锂及粘结剂,再经1.5-35MPa的压力压制成膜,负极材料含有钛酸锂,电解液中各组分的质量份为:电解质锂盐21份、碳酸乙烯酯18份、碳酸亚乙烯酯15份、丙磺酸内酯7份、双草酸硼酸酯7份、冠醚3份、联苯5份,溶剂为100份,其中溶剂由如下体积比的组分组成:碳酸乙烯酯:碳酸二甲酯:碳酸丙烯酯:碳酸甲乙酯=16:38:25:5。
将实施例3所得的正极、隔膜、负极按次序叠放装配制成电芯,60℃干燥24h,装入电池壳体,注入27g上述电解液,浸润,封口,化成,分容,制得的石墨烯钛酸锂电池,内阻为0.5-1.0mΩ,循环次数超过10000次,针刺试验和挤压试验全部合格,倍率性能和安全性能都得到了大幅的提高。
以上所述,仅为本发明的具体实施方式,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,可轻易想到变化或替换,都应涵盖在本发明的保护范围之内。因此,本发明的保护范围应以所述权利要求的保护范围为准。
Claims (1)
1.一种石墨烯钛酸锂电池,由正极材料、负极材料、电解液和隔膜组成,其中,正极材料包括高石墨化度的膨胀石墨烯膜,负极材料含有钛酸锂,电解液组成为电解质锂盐、碳酸乙烯酯、碳酸亚乙烯酯、丙磺酸内酯、双草酸硼酸酯、冠醚、联苯以及溶剂;
电解液中各组分的质量份为:电解质锂盐15-25份、碳酸乙烯酯10-30份、碳酸亚乙烯酯10-15份、丙磺酸内酯5-8份、双草酸硼酸酯3-7份、冠醚1-5份和联苯3-8份,溶剂70-100份;
电解液中所述溶剂由如下体积比的组分组成:碳酸乙烯酯:碳酸二甲酯:碳酸丙烯酯:碳酸甲乙酯=13-30:35-60:20-30:3-6;
所述正极材料由活性材料、高石墨化度的膨胀石墨烯膜和粘合剂组成,所述正极材料的具体制备方法为:将膨胀石墨烯经2500℃温度下保温5分钟-60分钟后,混合活性材料及粘结剂,再经1.5-35MPa的压力压制成膜;
所述正极材料中的活性材料为磷酸铁锂、锰酸锂或三元材料、镍锰酸锂中的一种;
所述隔膜位于正极与负极之间,由1-6层的玻璃纤维构成;
所述石墨烯钛酸锂电池的内阻为0.4-1mΩ,循环次数超过10000次。
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