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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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高性能锂离子电池隔膜的结构设计及其制备与表征
DOI: 10.11777/j.issn1000-3304.2015.15138, PP. 1271-1279
Keywords: 静电纺丝,复合纳米纤维膜,锂离子电池,界面稳定性
Abstract:
设计并采用高压静电纺丝法制备了单层结构的聚偏氟乙烯(PVDF)/偏氟乙烯与六氟丙烯的共聚物(PVDF-HFP)纳米纤维膜及三层结构、二层结构的PVDF/PVDF-HFP/Al2O3复合纳米纤维膜.复合膜的表面形貌、热物理性质和电化学性能通过扫描电子显微镜(SEM)、示差扫描量热法(DSC)、高温尺寸收缩率、交流阻抗法进行了表征.单层结构的PVDF/PVDF-HFP纳米纤维膜的纤维表面光滑,平均纤维直径2μm,纤维分布较均匀,而PVDF与Al2O3复合后的纤维表面粗糙,平均纤维直径变小,结晶度降低,吸液率增大.二层结构的PVDF/PVDF-HFP/Al2O3复合隔膜在170℃下受热1h收缩率为3%.将3种结构的复合膜在1mol/LLiPF6/(EC+DMC+DEC,111,W/W/W)电解质溶液中活化得到聚合物电解质.25℃时,二层结构的PVDF/PVDF-HFP/Al2O3复合隔膜吸液率高达497wt%,离子电导率可达5.04×10-3S/cm,电化学稳定窗口达到4.62V(Li/Li+).组装成LiFePO4/Li电池测试其电池性能,结果表明,二层结构的PVDF/PVDF-HFP/Al2O3复合膜朝向锂负极时,电池的循环性能更好,且与锂金属负极具有更好的相容性和界面稳定性.
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