Facile fabrication of multilayer separators for lithium-ion battery via multilayer coextrusion and thermal induced phase separation
Facile fabrication of multilayer separators for lithium-ion battery via multilayer coextrusion and thermal induced phase separation
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DOI：
10.1016/j.jpowsour.2018.02.086
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发表时间：
2018-04
影响因子：
9.2
通讯作者：
Yajie Li;H. Pu
中科院分区：
文献类型：
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作者：
Yajie Li;H. Pu
通过多层共挤（MC）和热诱导相分离（TIPS）的结合，有效地制备了用于锂离子电池的具有蜂窝状亚微米孔结构的聚丙烯（PP）/聚乙烯（PE）多层隔膜。所制备的隔膜（称为 MC-TIPS PP/PE）不仅表现出有效的热关断功能和更宽的关断温度窗口，而且还表现出比具有 PP 和 PE 三层结构的商业隔膜（Celgard®2325）更高的热稳定性。 MC-TIPS PP/PE 的尺寸收缩在 160°C 之前可以忽略不计。此外，与商用隔膜相比，MC-TIPS PP/PE 具有更高的孔隙率和电解质吸收率，从而实现更高的离子电导率和更好的电池性能。上述令人着迷的特性和便捷的制备工艺使得MC-TIPS PP/PE成为高性能锂离子电池隔膜应用的有希望的候选者。
Polypropylene (PP)/polyethylene (PE) multilayer separators with cellular-like submicron pore structure for lithium-ion battery are efficiently fabricated by the combination of multilayer coextrusion (MC) and thermal induced phase separation (TIPS). The as-prepared separators, referred to as MC-TIPS PP/PE, not only show efficacious thermal shutdown function and wider shutdown temperature window, but also exhibit higher thermal stability than the commercial separator with trilayer construction of PP and PE (Celgard®2325). The dimensional shrinkage of MC-TIPS PP/PE can be negligible until 160 °C. In addition, compared to the commercial separator, MC-TIPS PP/PE exhibits higher porosity and electrolyte uptake, leading to higher ionic conductivity and better battery performances. The above-mentioned fascinating characteristics with the convenient preparation process make MC-TIPS PP/PE a promising candidate for the application as high performance lithium-ion battery separators.