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Preparation of a PVdF-HFP/polyethylene composite gel electrolyte with shutdown function for lithium-ion secondary battery by Xingjiang Liu; Hiroaki Kusawake; Saburo Kuwajima is a Engineering article available to read on EtoBox.

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In order to improve the safety of lithium-ion secondary battery, a PVdF-HFP/polyethylene (PE) composite gel electrolyte with thermal shutdown function was prepared as an internal safety device. The composite gel electrolyte consists of a PVdF-HFP polymer, PE thermoplastic resin, and 1.0 mol/dm 3 LiClO 4 /PC EC (or LiPF 6 /GBL EC) plasticizer. When the PE content is over 23 wt.%, the electrical impedance of the composite gel electrolyte can increase rapidly by several orders, around the melting point of PE (mp: 90 or 104À1158C). By the SEM observation it was found that the PE particles uniformly dispersed in the PVdF-HFP gel electrolyte could be fused and formed into a continuous ®lm at or near the PE melting point. The continuous PE ®lm exhibits an ability to cut off the ion diffusion between cathode and anode, thus preventing the cell from thermal runaway. Also, a three-layered ®lm of pure PVdF-HFP gel/ composite gel/pure PVdF-HFP with a higher ionic conductivity and good mechanical strength was prepared for assembling a coin-type lithium-ion cell.

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Author

Xingjiang Liu; Hiroaki Kusawake; Saburo Kuwajima

Publisher

Elsevier BV

Published

2001

Language

EN

Field

Engineering (Physical Sciences)