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PVDF-HFP基凝胶电解质用于LiNi0.5Co0.2Mn0.3O2三元正极锂离子电池 被引量:7

PVDF-HFP Based Gel Electrolyte for Lithium-ion Battery with LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2 Cathode
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摘要 以聚偏氟乙烯-六氟丙烯(Poly(vinylidene fluoride-hexafluoropropylene),PVDF-HFP)为聚合物基体,新戊二醇二丙烯酸酯(Neopentyl glycol diacrylate,NPGDA)为交联剂,在引发剂偶氮二异丁腈(2,2′-Azobis(2-methylpropionitrile),AIBN)的作用下通过室温现场聚合法制备凝胶电解质用于锂离子电池。探索不同质量比PVDF-HFP/NPGDA对凝胶电解质性能和LiNi_(0.5)-Co_(0.2)Mn_(0.3)O_2三元正极锂离子电池性能的影响。结果表明,当质量比为1∶1时,凝胶电解质具有较高的离子电导率,为8.45mS·cm^(-1),锂离子迁移数为0.78,电化学窗口为4.5V。在电流密度30mA·g^(-1)恒流充放电,首次放电比容量为143mAh·g^(-1),循环50次后仍高达135.3mAh·g^(-1)。电流密度为300mA·g^(-1)时,放电比容量为100.2mAh·g^(-1)。 Gel electrolyte for lithium ion battery was prepared via room-temperature in-situ polymerization using poly(vinyli denefluoride-co-hexafluoro-propylene) (PVDF-HFP) as polymer matrix, neopentylglycoldiacrylate (NPGDA) as crosslinking agent, 2,2'-azobis(2-methylpropionitrile) (AIBN) as initiator. The effects of the mass ratio of PVDF-HFP/NPGDA on the performances of gel electrolyte and lithium ion batteries were investigated. The results showed that the gel electrolyte with the PVDF-HFP/NP(;I)A mass ratio of 1 : 1 had a high ionic conductivity of 8. 45 mS cm-1 , a lithium ion transport number of 0. 78 and an electrochemical potential window of 4. 5 V, as well as a good compatibility with lithium anode. The initial discharge specific capacity was 143 mAh g-1 at a current density of 30 mA g-1, and the retention capacity was up to 135.3 mAh g-1 after 50 cycles. The discharge speci- fic capacity of the battery was 100. 2 mAh g-1 at a current density of 300 mA g-1.
出处 《材料导报》 EI CAS CSCD 北大核心 2017年第12期6-10,共5页 Materials Reports
基金 国家自然科学基金(51162006 51362009) 海南省重点项目(ZDXM2015118) 国际科技合作专项(KJHZ2015-02) 中央引导地方科技发展专项资金项目(ZY2016HN07) 海南大学科研启动基金(kyqd1539)
关键词 聚偏氟乙烯-六氟丙烯 凝胶电解质 LiNi0.5Co0.2Mn0.3O2 锂离子电池 电化学性能 PVDF-HFP, gel electrolyte, LiNi0. 5Co0. 2Mn0. 3O2, lithium-ion battery, electrochemical performance
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