Surface modification of polyolefin separators for lithium ion batteries to reduce thermal shrinkage without thickness increase

doi:10.1016/S2095-4956(15)60294-7

能源化学(英文) ›› 2015, Vol. 21 ›› Issue (2): 138-144.DOI: 10.1016/S2095-4956(15)60294-7

Surface modification of polyolefin separators for lithium ion batteries to reduce thermal shrinkage without thickness increase

Peng Zhao^a, Juping Yang^a, Yuming Shang^a,c, Li Wang^a,b, Mou Fang^a, Jianlong Wang^a, Xiangming He^a,c

a. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;
b. State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China;
c. Huadong Institute of Lithium Ion Battery, Zhangjiagang 215600, Jiangsu, China

收稿日期:2014-08-30 修回日期:2014-11-12 出版日期:2015-03-23 发布日期:2015-03-23
通讯作者: Li Wang, Xiangming He
基金资助:
This work is supported by the MOST (Grant No. 2013CB934000, 2014DFG71590, 2011CB935902, 2010DFA72760, 2011CB711202, 2013AA050903, 2011AA11A257 and 2011AA11A254), China Postdoctoral Science Foundation (Grant No. 2013M530599 and 2013M540929), Tsinghua University Initiative Scientific Research Program (Grant No. 2010THZ08116, 2011THZ08139, 2011THZ01004 and 2012THZ08129), the State Key Laboratory of Automotive Safety and Energy (No. ZZ2012-011) and Suzhou (Wujiang) Automotive Research Institute, Tsinghua University, Project No. 2012WJ-A-01.

Surface modification of polyolefin separators for lithium ion batteries to reduce thermal shrinkage without thickness increase

Peng Zhao^a, Juping Yang^a, Yuming Shang^a,c, Li Wang^a,b, Mou Fang^a, Jianlong Wang^a, Xiangming He^a,c

a. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;
b. State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing 100084, China;
c. Huadong Institute of Lithium Ion Battery, Zhangjiagang 215600, Jiangsu, China

Received:2014-08-30 Revised:2014-11-12 Online:2015-03-23 Published:2015-03-23
Contact: Li Wang, Xiangming He
Supported by:
This work is supported by the MOST (Grant No. 2013CB934000, 2014DFG71590, 2011CB935902, 2010DFA72760, 2011CB711202, 2013AA050903, 2011AA11A257 and 2011AA11A254), China Postdoctoral Science Foundation (Grant No. 2013M530599 and 2013M540929), Tsinghua University Initiative Scientific Research Program (Grant No. 2010THZ08116, 2011THZ08139, 2011THZ01004 and 2012THZ08129), the State Key Laboratory of Automotive Safety and Energy (No. ZZ2012-011) and Suzhou (Wujiang) Automotive Research Institute, Tsinghua University, Project No. 2012WJ-A-01.

摘要/Abstract

摘要： Surface chemical modification of polyolefin separators for lithium ion batteries is attempted to reduce the thermal shrinkage, which is important for the battery energy density. In this study, we grafted organic/inorganic hybrid crosslinked networks on the separators, simply by grafting polymerization and condensation reaction. The considerable silicon-oxygen crosslinked heat-resistance networks are responsible for the reduced thermal shrinkage. The strong chemical bonds between networks and separators promise enough mechanical support even at high temperature. The shrinkage at 150℃ for 30 min in the mechanical direction was 38.6% and 4.6% for the pristine and present graft-modified separators, respectively. Meanwhile, the grafting organic-inorganic hybrid crosslink networks mainly occupied part of void in the internal pores of the separators, so the thicknesses of the graft-modified separators were similar with the pristine one. The half cells prepared with the modified separators exhibited almost identical electrochemical properties to those with the commercial separators, thus proving that, in order to enhance the thermal stability of lithium ion battery, this kind of grafting-modified separators may be a better alternative to conventional silica nanoparticle layers-coated polyolefin separators.

关键词: thermal shrinkage, organic/inorganic hybrid crosslinked network, chemical grafting, separator, lithium ion battery

Abstract: Surface chemical modification of polyolefin separators for lithium ion batteries is attempted to reduce the thermal shrinkage, which is important for the battery energy density. In this study, we grafted organic/inorganic hybrid crosslinked networks on the separators, simply by grafting polymerization and condensation reaction. The considerable silicon-oxygen crosslinked heat-resistance networks are responsible for the reduced thermal shrinkage. The strong chemical bonds between networks and separators promise enough mechanical support even at high temperature. The shrinkage at 150℃ for 30 min in the mechanical direction was 38.6% and 4.6% for the pristine and present graft-modified separators, respectively. Meanwhile, the grafting organic-inorganic hybrid crosslink networks mainly occupied part of void in the internal pores of the separators, so the thicknesses of the graft-modified separators were similar with the pristine one. The half cells prepared with the modified separators exhibited almost identical electrochemical properties to those with the commercial separators, thus proving that, in order to enhance the thermal stability of lithium ion battery, this kind of grafting-modified separators may be a better alternative to conventional silica nanoparticle layers-coated polyolefin separators.

Key words: thermal shrinkage, organic/inorganic hybrid crosslinked network, chemical grafting, separator, lithium ion battery

Peng Zhao, Juping Yang, Yuming Shang, Li Wang, Mou Fang, Jianlong Wang, Xiangming He. Surface modification of polyolefin separators for lithium ion batteries to reduce thermal shrinkage without thickness increase[J]. 能源化学(英文), 2015, 21(2): 138-144.

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Surface modification of polyolefin separators for lithium ion batteries to reduce thermal shrinkage without thickness increase

Surface modification of polyolefin separators for lithium ion batteries to reduce thermal shrinkage without thickness increase

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