首页|Multilayer polyethylene separator with enhanced thermal properties for safe lithium-ion batteries

Multilayer polyethylene separator with enhanced thermal properties for safe lithium-ion batteries

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The separator plays an important part in battery safety and performance.Polyolefin separators are widely used in commercial Lithium-ion batteries(LIBs),owing to their excellent properties,but they suffer from serious thermal shrinkage and poor electrolyte wettability.Thus,a multilayer separator(ASPESA)is developed by coating two thin layers of low-density polyethylene(LDPE)and Al2O3 on both sides of a polyethylene membrane using a facile and environmentally friendly casting technique.The ASPESA separator demonstrates a shutdown function at 120 ℃ and shows enhanced thermal stability under 185 ℃,with a small thermal shrinkage of 1％.Meanwhile,the LDPE and Al2O3 layers can improve the electrolyte wettability and electrolyte uptake(407.23％).The multilayer ASPESA separator delivers an excellent cycle performance in LiFePO4‖Li cells with a discharge capacity of 144.5 mAh g-1 after 900 cycles,with a high-capacity retention of 98.9％(compared to the 5th cycle).Therefore,the multilayer ASPESA separator has great utilization potential as a high-safety separator in LIBs.

Low-density polyethylene microspheresAl2O3 particlesThermal shutdownHigh safetyLithium-ion batteries

Ying Jiang、Chen Sun、Feilong Dong、Haiming Xie、Liqun Sun

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National & Local United Engineering Laboratory for Power Battery,Department of Chemistry,Northeast Normal University,Changchun,130024,China

Jilin Province Science and Technology Department major science and technology projectJilin Province Science and Technology Department major science and technology projectKey Subject Construction of Physical Chemistry of Northeast Normal UniversityEducation Department of Jilin Province science and technology project of"13th Five-Year"Fundamental Research Funds for the Central Universities

20220301004GX20220301005GXJJKH20200764KJ135113014

2024

10.1016/j.partic.2023.12.017

颗粒学报(英文版)
中国颗粒学会　中国科学院过程工程研究所

颗粒学报(英文版)

CSTPCD
影响因子：0.632
ISSN：1674-2001
年,卷(期)：2024.91(8)