Battery
separators play a vital role in the safety, sustainability,
and electrochemical performance of lithium ion batteries (LIBs). In
this work, thermally resistant composite membranes were fabricated
by a wet-laid process using northern bleached softwood kraft (NBSK)
fibers, polysulfonamide (PSA) fibers, and nanofibrillated cellulose
(NFC), for lithium ion battery applications. NFC functioned as a mediator
to control and optimize pore size in the composite membranes, while
the PSA fibers provided superior heat resistance to the membranes.
The as-prepared composite separator membranes have more uniform micropores
and superior thermal stability and electrolyte absorption in comparison
with a commercial separator membrane (Celgard 2350).
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