CN113054236A - 一种耐高温锂离子电池 - Google Patents
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Abstract
本发明涉及一种耐高温锂离子电池,极组的外层包覆活性碳固态胺纤维薄膜,其具有以下制作步骤:将聚丙烯腈纤维放入氢氧化钠反应后,再放入盐酸浸泡,得到的PAN‑COOH型纤维放入氯化亚砜和无水N,N‑二甲基酰胺中,反应烘干得到的PAN‑COOI型纤维放入聚乙烯亚胺和吡啶中,烘干得到PAN‑PEI固态胺纤维;将活性炭和粘结剂加入到溶剂中制成浆料,涂覆到PAN‑PEI固态胺纤维上,得到的涂炭固态胺纤维薄膜包覆在极组的外层,进行封装、注液、化成、老化。本发明通过在电池内部卷芯或叠片极组外层包覆活性碳固态胺纤维薄膜,用于吸附水、二氧化碳和甲烷气体,即锂离子高温存储过程中副反应产生的气体吸附在纤维薄膜上,可避免电池在高温下产气导致电池失效。
Description
技术领域
本发明涉及蓄电池技术领域,具体涉及一种耐高温锂离子电池。
背景技术
随着2019年5G元年的开始,通信锂电市场迎来新的发展机遇。从运营商来看,集采以锂电池为主,用于后备电源。部分基站为户外环境,其环境温度波动在-30℃~55℃。当锂电池在满电高温存储时,在负极与电解液之间会发生副反应,副反应伴随产生二氧化碳、烷烃为主的气体,产气后极片间间隙增大,电池迅速劣化,严重的导致整个锂电池无法使用。
发明内容
本发明的目的是克服现有技术的缺陷,提供一种耐高温锂离子电池。
实现本发明目的的技术方案是:一种耐高温锂离子电池,具有极组,所述极组的外层包覆活性碳固态胺纤维薄膜,所述活性碳固态胺纤维薄膜具有以下制作步骤:
S1,将聚丙烯腈纤维放入氢氧化钠溶液中反应后,再放入盐酸中浸泡,取出烘干得到PAN-COOH型纤维;
S2,将PAN-COOH型纤维放入氯化亚砜和无水N,N-二甲基酰胺混合溶液中反应,烘干得到PAN-COOI型纤维;
S3,将PAN-COOI型纤维放入聚乙烯亚胺和吡啶的混合溶液中,烘干得到PAN-PEI固态胺纤维;
S4,将90%~98%活性炭和2%~10%的粘结剂加入到溶剂中制成浆料,涂覆到PAN-PEI固态胺纤维上,烘干后得到涂炭固态胺纤维薄膜;
S5,将涂炭固态胺纤维薄膜包覆在极组的外层,进行封装、注液、化成、老化。
上述技术方案S1中,所述氢氧化钠溶液浓度为0.3~0.7mol/L,反应温度为75~95℃,反应时间为6~8h。
上述技术方案S1中,所述盐酸浓度为0.5~1.0mol/L。
上述技术方案S2中,所述氯化亚砜和无水N,N-二甲基酰胺混合溶液的反应温度为100~120℃,反应时间为5~7h。
上述技术方案S3中,所述聚乙烯亚胺和吡啶的混合溶液在氮气气氛环境中反应,反应温度85~95℃,反应时间5~7h。
上述技术方案S4中,所述溶剂为N-甲基吡咯烷酮。
上述技术方案S4中,所述粘结剂为聚偏氟乙烯。
上述技术方案所述极组为卷芯和叠片中的一种。
采用上述技术方案后,本发明具有以下积极的效果:
本发明通过在电池内部卷芯或叠片极组外层包覆活性碳固态胺纤维薄膜,用于吸附水、二氧化碳和甲烷气体,即锂离子高温存储过程中副反应产生的气体吸附在纤维薄膜上,可避免电池在高温下产气导致电池失效。
附图说明
为了使本发明的内容更容易被清楚地理解,下面根据具体实施例并结合附图,对本发明作进一步详细的说明,其中
图1为耐高温电池循环次数后的容量保持率示意图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚,下面将结合本发明实施例中,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例是本发明一部分实施例,而不是全部的实施例。
实施例1
本发明提供一种耐高温锂离子电池,具有极组,所述极组的外层包覆活性碳固态胺纤维薄膜,所述活性碳固态胺纤维薄膜具有以下制作步骤:
S1,将聚丙烯腈纤维放入氢氧化钠溶液中反应后,再放入盐酸中浸泡,取出烘干得到PAN-COOH型纤维;
S2,将PAN-COOH型纤维放入氯化亚砜和无水N,N-二甲基酰胺混合溶液中反应,烘干得到PAN-COOI型纤维;
S3,将PAN-COOI型纤维放入聚乙烯亚胺和吡啶的混合溶液中,烘干得到PAN-PEI固态胺纤维;
S4,将90%~98%活性炭和2%~10%的粘结剂加入到溶剂中制成浆料,涂覆到PAN-PEI固态胺纤维上,烘干后得到涂炭固态胺纤维薄膜;
S5,将涂炭固态胺纤维薄膜包覆在极组的外层,进行封装、注液、化成、老化。
S1中,所述氢氧化钠溶液浓度为0.3~0.7mol/L,反应温度为75~95℃,反应时间为6~8h。
S1中,所述盐酸浓度为0.5~1.0mol/L。
S2中,所述氯化亚砜和无水N,N-二甲基酰胺混合溶液的反应温度为 100~120℃,反应时间为5~7h。
S3中,所述聚乙烯亚胺和吡啶的混合溶液在氮气气氛环境中反应,反应温度85~95℃,反应时间5~7h。
S4中,所述溶剂为N-甲基吡咯烷酮。
S4中,所述粘结剂为聚偏氟乙烯。
极组为卷芯和叠片中的一种。
实施例2
将耐高温三元软包电池和普通三元软包电池满充电后,测试满电态电压和内阻,在60℃±3℃下储存7d后再次测试电压内阻;在25℃±3℃下恢复5h后,以1C电流放电,直到放电终止电压2.5V,取得保持容量数据;将电池再次满充电,然后在室温下下以1C电流放电,直到放电终止电压 2.5V,取得恢复容量数据。
从表中可知,使用了包覆活性碳固态胺纤维薄膜的电池比未使用该膜的普通电池高温存储性能好,耐高温电池存储后的容量保持率和恢复率高,内阻增加小。
实施例3
将耐高温三元软包电池和普通三元软包电池在55℃环境下进行1C充放电循环,进行高温循环后如图1所示。
从图1可知,耐高温电池高温循环453次后,容量保持率为91.4%;普通电池高温循环452次后,容量保持率为87.9%;耐高温电池的高温循环性能比普通电池的高温循环性能好。
以上所述的具体实施例,对本发明的目的、技术方案和有益效果进行了进一步详细说明,所应理解的是,以上所述仅为本发明的具体实施例而已,并不用于限制本发明,凡在本发明的精神和原则之内,所做的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
Claims (8)
1.一种耐高温锂离子电池,具有极组,其特征在于,所述极组的外层包覆活性碳固态胺纤维薄膜,所述活性碳固态胺纤维薄膜具有以下制作步骤:
S1,将聚丙烯腈纤维放入氢氧化钠溶液中反应后,再放入盐酸中浸泡,取出烘干得到PAN-COOH型纤维;
S2,将PAN-COOH型纤维放入氯化亚砜和无水N,N-二甲基酰胺混合溶液中反应,烘干得到PAN-COOI型纤维;
S3,将PAN-COOI型纤维放入聚乙烯亚胺和吡啶的混合溶液中,烘干得到PAN-PEI固态胺纤维;
S4,将90%~98%活性炭和2%~10%的粘结剂加入到溶剂中制成浆料,涂覆到PAN-PEI固态胺纤维上,烘干后得到涂炭固态胺纤维薄膜;
S5,将涂炭固态胺纤维薄膜包覆在极组的外层,进行封装、注液、化成、老化。
2.根据权利要求1所述的一种耐高温锂离子电池,其特征在于:S1中,所述氢氧化钠溶液浓度为0.3~0.7mol/L,反应温度为75~95℃,反应时间为6~8h。
3.根据权利要求1所述的一种耐高温锂离子电池,其特征在于:S1中,所述盐酸浓度为0.5~1.0mol/L。
4.根据权利要求1所述的一种耐高温锂离子电池,其特征在于:S2中,所述氯化亚砜和无水N,N-二甲基酰胺混合溶液的反应温度为100~120℃,反应时间为5~7h。
5.根据权利要求1所述的一种耐高温锂离子电池,其特征在于:S3中,所述聚乙烯亚胺和吡啶的混合溶液在氮气气氛环境中反应,反应温度85~95℃,反应时间5~7h。
6.根据权利要求1所述的一种耐高温锂离子电池,其特征在于:S4中,所述溶剂为N-甲基吡咯烷酮。
7.根据权利要求1所述的一种耐高温锂离子电池,其特征在于:S4中,所述粘结剂为聚偏氟乙烯。
8.根据权利要求1所述的一种耐高温锂离子电池,其特征在于:所述极组为卷芯和叠片中的一种。
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