Journal
JOURNAL OF POWER SOURCES
Volume 196, Issue 16, Pages 7021-7024Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2010.09.111
Keywords
Lithium ion battery; Overcharge protection; Voltage-sensitive separator; Poly(3-decylthiophene)
Funding
- National Science Foundation of China [20773095]
- National 863 Program of China [2007AA03Z224]
- National 973 Program of China [2009CB220103]
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A voltage-sensitive separator is prepared simply by impregnating electroactive poly(3-decylthiophene) (P3DT) polymer into a commercial porous separator and tested for a self-actuating control of overcharge voltage of LiFePO4/C lithium-ion batteries. The experimental results demonstrate that this type of separator can be reversibly p-doped and dedoped to maintain the cell's voltage at a safe value of <= 4 V even at high rate overcharge of 3 C current, effectively protecting the batteries from voltage runaway. Since this P3DT-modified separator has no obvious negative impact on the normal charge-discharge performance of the batteries, it may be adopted for practical application in commercial lithium ion batteries. (C) 2010 Elsevier B.V. All rights reserved.
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