Lithiated poly (ether ether ketone) separators with excellent thermal stability and electrolyte wettability for lithium-ion battery

Li, Longhui; Xiong, Ruoyu; Wang, Xuyang; Zhou, Mengyuan; Sun, Shi‐Gang; Shen, Guancheng; Lan, Song; Zhang, Yun; Zhou, Huamin

doi:10.1007/s10853-022-07761-0

Cited by 4 publications

(2 citation statements)

References 43 publications

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“…X-ray photoelectron spectroscopy (XPS) estimated the weight percentage of S in the PEEK layer to be 0.68% (as shown in Figure b). The sulfonated porous PEEK, with polar groups in its backbone chains, is expected to have a favorable affinity with highly polar electrolytes. − …”

Section: Resultsmentioning

confidence: 99%

“…The sulfonated porous PEEK, with polar groups in its backbone chains, is expected to have a favorable affinity with highly polar electrolytes. 17 Additionally, the PEEK coatings only slightly reduced the mechanical strength of the polyolefin separators, which may have been caused by the corrosive effects of sulfuric acid. As seen in Figures 2c,d and S5, the tensile strength of the PEEKcoated separators was decreased by approximately 10% compared to their polyolefin counterparts and the tensile moduli of PE and PP were reduced from 750 and 1036 MPa to 695 and 878 MPa for PE-PEEK and PP-PEEK, respectively.…”

Section: Morphology and Physicalmentioning

confidence: 99%

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Poly(ether ether ketone) Conferred Polyolefin Separators with High Dimensional Thermal Stability for Lithium-Ion Batteries

Liu

Zhang

et al. 2023

ACS Appl. Mater. Interfaces

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The traditional polyolefin separators used in lithium-ion batteries (LIBs) are plagued by limitations such as poor wetting of electrolytes and insufficient thermal stability, hindering the progress of LIBs. To overcome these limitations, we have developed a modified phase inversion technique to efficiently and durably coat polyolefin separators with poly(ether ether ketone) (PEEK). The resulting PEEK-coated polyolefin separators exhibit mechanical properties similar to those of unmodified polyolefin separators, with comparable tensile strength and modulus. Furthermore, the PEEK coating provides outstanding thermal stability, as the modified separators maintain their stability even at temperatures up to 200 °C, which is among the best results reported for polyolefin-based separators. In addition, the PEEK coating enhances ionic conductivity by more than 100% compared to polyolefin counterparts, leading to significant improvement in the electrochemical performance of prototype half cells. The modified phase inversion technique presented here offers a practical solution for coating polyolefin separators with functional polymers, paving the way for next-generation separator materials.

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