Premium
A Thermally Stable, Combustion‐Resistant, and Highly Ion‐Conductive Separator for Lithium‐Ion Batteries Based on Electrospun Fiber Mats of Crosslinked Polybenzoxazine
Author(s) -
Li HsiehYu,
Li GuoAn,
Lee YunYang,
Tuan HsingYu,
Liu YingLing
Publication year - 2016
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201500368
Subject(s) - separator (oil production) , materials science , electrolyte , ion , chemical engineering , electrospinning , membrane , composite material , electrical conductor , ionic conductivity , polymer , chemistry , electrode , organic chemistry , biochemistry , physics , engineering , thermodynamics
Porous and thermally stable membranes are attractive materials as separators in lithium‐ion batteries. This work reports a new class of high‐performance separators for Li‐ion batteries based on a crosslinked polybenzoxazine electrospun fiber mat (CR‐PBz‐FbM). The CR‐PBz‐FbM separator shows a high ion conductivity of 2.92 mS cm −1 (5.2 times the value recorded for Celgard 2300), a low MacMullin number of 3.35, ultrahigh electrolyte uptake (≈825 %), and near‐zero shrinkage at 150 °C. Consequently, the CR‐PBz‐FbM separator shows a high C‐rate capacity and good cycle retention in the half‐cell test. At a C‐rate of 2.0, the CR‐PBz‐FbM‐based Li‐ion cell only exhibits a capacity loss of 16 % compared to a 40 % capacity loss found with the cell based on Celgard 2300. The results demonstrate that CR‐PBz‐FbM is an inexpensive, non‐shutdown‐type, thermally stable, and highly ion‐conductive separator for Li‐ion batteries.