Preparation of Highly Porous PAN-LATP Membranes as Separators for Lithium Ion Batteries

Abstract

Separators are a vital component to ensure the safety of lithium-ion batteries. However, the commercial separators employed in lithium ion batteries are inefficient due to their low porosity. In the present study, a simple electrospinning technique is adopted to prepare highly porous polyacrylonitrile (PAN)-based membranes with a higher concentration of lithium aluminum titanium phosphate (LATP) ceramic particles, as a viable alternative to the commercialized separators used in lithium ion batteries. The effect of the LATP particles on the morphology of the porous membranes is demonstrated through Field emission scattering electron microscopy. X-ray diffraction and Fourier transform infrared spectra studies suitably demonstrate the mixing of PAN and LATP particles in the polymer matrix. PAN with 30 wt% LATP (P-L30) exhibits an enhanced porosity of 90% and is more thermally stable, with the highest electrolyte uptake among all the prepared membranes. Due to better electrolyte uptake, the P-L30 membrane demonstrates an improved ionic conductivity of 1.7 mS/cm. A coin cell prepared with a P-L30 membrane and a LiFePO4 cathode demonstrates the highest discharge capacity of 158 mAh/g at 0.5C rate. The coin cell with the P-L30 membrane also displays good cycling stability by retaining 87% of the initial discharge capacity after 200 cycles of charging and discharging at 0.5C rate.

Sulfide and Oxide Inorganic Solid Electrolytes for All-Solid-State Li Batteries: A Review

“…Sodium zirconium phosphate (NaZr 2 (PO 4 ) 3 (NZP) is the parent compound of the Na-based super ionic conductor named NASICON [ 359 , 360 , 361 , 362 , 363 , 364 , 365 , 366 , 367 , 368 , 369 , 370 , 371 , 372 , 373 , 374 , 375 , 376 , 377 , 378 , 379 , 380 , 381 , 382 , 383 , 384 , 385 , 386 , 387 , 388 , 389 , 390 , 391 , 392 , 393 , 394 , 395 , 396 , 397 , 398 , 399 , 400 , 401 , 402 , 403 , 404 , 405 , 406 ,…”

“…Recently, Case et al [ 384 ] performed computational studies of LATP and Binninger et al [ 276 ] analyzed the electrochemical stability window of the LATP electrolyte using computational methods. Furthermore, Siyal et al [ 385 ] analyzed a gel polymer electrolyte with 15 wt.% LATP composite, and few other researchers studied bare and LATP composite electrodes [ 379 , 386 , 387 , 388 ]. Yen et al [ 389 ] characterized LATP powders prepared by hydrothermal synthesis followed by calcination (900–1100 °C), cold pressing (90 MPa), and post sintering, which exhibit ionic conductivity of grain and grain boundary of 6.57 × 10 −4 and 4.59 × 10 −4 S cm −1 , respectively.…”

Progress and perspective of Li1 + xAlxTi2‐x(PO4)3 ceramic electrolyte in lithium batteries

“…In addition, the high ionic conductivity of LATP may also partially contribute to the overall ionic conductivity, which needs further research to quantification. Similarly, Jagdeep et al 128 studied the effect of LATP particles on the porosity of LATP/PAN composite membrane. When LATP content is 30 wt%, the composite membrane exhibits the maximum electrolyte uptake of 600% and the corresponding GPE show the highest ionic conductivity of 1.7 mS cm À1 .…”

Electrospun Polyetherimide-Graphene Oxide Nanofiber Electrodes for Enhanced Conductivity

“…The porosity of the electrospun nanofiber membrane was analyzed by following n-butanol soaked-up method [32,33]. In this method, the nanofiber mat was cut into small rectangular shapes (2 cm × 2 cm), individually weighed, and soaked into nbutanol for about 2 hours at room temperature.…”

“…The nanofiber film was then removed from the solution and wiped with tissue to remove excess solvent on it before weighing it. Eventually, the porosity of the nanofiber membrane was calculated using the following equation (1) [33,34];…”