A poly(3-decyl thiophene)-modified separator with self-actuating overcharge protection mechanism for LiFePO4-based lithium ion battery
✍ Scribed by S.L. Li; L. Xia; H.Y. Zhang; X.P. Ai; H.X. Yang; Y.L. Cao
- Publisher
- Elsevier Science
- Year
- 2011
- Tongue
- English
- Weight
- 647 KB
- Volume
- 196
- Category
- Article
- ISSN
- 0378-7753
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✦ Synopsis
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 LiFePO 4 /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.