Premium
Achieving superiorly high heat‐dimensional stability, high strength, and good electrochemical performance for electrospun separators in power lithium‐ion battery through building unique condensed structure based on polyimide and poly (m‐phenylene isophthalamide)
Author(s) -
Xu Jiali,
Yuan Li,
Liang Guozheng,
Gu Aijuan
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.51233
Subject(s) - polyimide , materials science , thermal stability , electrospinning , membrane , electrochemistry , lithium (medication) , chemical engineering , nanofiber , ultimate tensile strength , composite material , chemistry , layer (electronics) , electrode , polymer , medicine , biochemistry , engineering , endocrinology
It is still a challenge for simultaneously achieving high heat resistance, high strength and outstanding electrochemical performance for separators in power lithium‐ion battery (PLB). Herein, new high performance electrospun separators are developed through building unique structure based on polyimide (PI) and poly (m‐phenylene isophthalamide) (PMIA). Orthogonal tests (4 4 ) show that the magnitude order of electrospinning factors on the morphology of membrane is concentration>injection rate>receiving distance>voltage. With the optimum factors, the electrospun membrane (PI/PMIA) was prepared, which was further pressed at 100°C for 10 min to get treated membrane (H‐PI/PMIA). Interestingly, the comprehensive performance of PI/PMIA is not a simple combination of those of PI and PMIA; instead, PI/PMIA has much better thermal and mechanical properties than both PI and PMIA, proving that PI/PMIA has a synergistic effect. PI/PMIA and H‐PI/PMIA not only have good ionic conductivity and electrochemical stability, but also have superiorly high properties including dimensional stability (thermal shrinkage temperature>300°C), tensile strengths (24.1 MPa for PI/PMIA, 34.3 MPa for H‐PI/PMIA) and capacity retentions (97.9%, 99.2%) compared with electrospun membranes for PLBs reported in the literature so far (SCI database). The mechanism behind these attractive performances is discussed from condensed structure of membranes.