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Preparation and performance of a novel polyarylethersulfone separator for lithium-ion batteries

Authors： Chu Jian1, Wang Lihua2*,Yu Xinhai 1*

Units： 1. Department of Applied Chemistry, Donghua University, Shanghai 201620, China Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China

KeyWords： a new-structure polyarylethersulfone (BDD); lithium-ion battery; separator; non-solvent induced phase separation method

ClassificationCode：352.7

year,volume(issue):pagination： 2021,41(6):75-84

Abstract：

By using the non-solvent induced phase separation(NIPS) method to prepare a new-structure polyarylethersulfone (BDD) lithium ion battery separator, this paper has a detailed exploration of the factors such as the type of solvent, polymer concentration, coagulation bath composition and the residence time of the casting liquid in the air (T) on the microstructure and performance of the separator film, which helps to work out the best film forming conditions : the solvent should be TEP, the polymer concentration should be 20%, the coagulation bath should be water and isopropanol in the proportion of 4:6, and the residence time of the casting liquid in the air should be 20 seconds. The separator is tested under the optimal film-forming conditions, and it is found that, compared with the PP separator, the BDD separator has higher porosity, liquid-absorbing ratio and ionic conductivity reaching 90.52%, 377.76% and 0.92 mS cm-1 as well as excellent thermal stability. The lithium-ion battery assembled by the polyarylethersulfone separator has reached a discharge specific capacity of 141.2 mAh g-1 at a current density of 0.2C, which is higher than the 123.7 mAh g-1 of PP, showing excellent rate performance. Meanwhile, the capacity retention rate reaches 92.3% after 100 cycles under 0.5 C, showing excellent cycle performance.

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AuthorIntro：

储健（1997-），安徽安庆人，硕士研究生，主要从事锂离子电池隔膜的制备.

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