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

PVDF-HFP Based Gel Electrolyte for Lithium-ion Battery with LiNi_(0.5)Co_(0.2)Mn_(0.3)O_2 Cathode

作　　者：薛景元 侯博[1] 莫岩 曹博凯 陈大明[1] 李德[1,2] 陈永[1,2] 

机构地区：[1]海南大学材料与化工学院,南海海洋资源利用国家重点实验室,海南省硅锆钛资源综合开发与利用重点实验室,海口570228 [2]南开大学先进能源材料化学教育部重点实验室,天津300071

出　　处：《材料导报》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)

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.

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 

分 类 号：TM911.3[电气工程—电力电子与电力传动]