Journal
JOURNAL OF ENERGY CHEMISTRY
Volume 24, Issue 2, Pages 138-144Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S2095-4956(15)60294-7
Keywords
thermal shrinkage; organic/inorganic hybrid crosslinked network; chemical grafting; separator; lithium ion battery
Funding
- MOST [2013CB934000, 2014DFG71590, 2011CB935902, 2010DFA72760, 2011CB711202, 2013AA050903, 2011AA11A257, 2011AA11A254]
- China Postdoctoral Science Foundation [2013M530599, 2013M540929]
- Tsinghua University Initiative Scientific Research Program [2010THZ08116, 2011THZ08139, 2011THZ01004, 2012THZ08129]
- State Key Laboratory of Automotive Safety and Energy [ZZ2012-011]
- Suzhou (Wujiang) Automotive Research Institute, Tsinghua University [2012WJ-A-01]
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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 degrees C 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.
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