Synthesis and Electrochemical Properties of Lithium Bis(heptafluoroisopropyl)tetrafluorophosphate

Chem. J. Chinese Universities

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Synthesis and Electrochemical Properties of Lithium Bis(heptafluoroisopropyl)tetrafluorophosphate

GUO Ai-Hong^1,2, BI Cheng-Liang^1,3, JIAO Li-Fang³, ZHANG Bao-Gui¹

1. College of Environmental Science and Engineering,
2. College of Resource and Environment, Hebei Polytechnic University, Tangshan 063009, China;
3. Institute of New Energy Material Chemistry, Nankai University, Tianjin 300071, China

Received:2005-12-19 Revised:1900-01-01 Online:2007-01-10 Published:2007-01-10
Contact: ZHANG Bao-Gui

Abstract

Abstract: Lithium-ion secondary cell has a high energy desity, stable and high working voltage, wide working temperature and long working term. It is a safe and clean energy resource without pollution. At present, lithium hexafluorophosphate is used as a conducting electrolyte lithium salt in lithium-ion secondary batteries. But lithium hexafluorophosphate as conducting electrolyte lithium salt has some disadvantages such as hydrolysis and instability. Lithium bis(heptafluoroisopropyl) tetrafluorophosphate Li[(C₃F₇)₂PF₄] was received by Simons process from diisopropylchlorophosphane in this paper. As an electrolyte of Li ion secondary cell, Li[(C₃F₇)₂PF₄] had lower vapor pressure than LiPF₆ in the solvent at the same temperature, comparable conductivity and oxidation stability in the same concentration at room temperature. It was worth mentioning that Li[(C₃F₇)₂PF₄] has an excellent stability towards hydrolysis. The synthesis process is safe and easily controlled.

Key words: Simons process, Lithium ion secondary cell, Electrolyte

CLC Number:

O621

TrendMD:

GUO Ai-Hong^1,2, BI Cheng-Liang^1,3, JIAO Li-Fang³, ZHANG Bao-Gui¹. Synthesis and Electrochemical Properties of Lithium Bis(heptafluoroisopropyl)tetrafluorophosphate[J]. Chem. J. Chinese Universities, doi: .

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Synthesis and Electrochemical Properties of Lithium Bis(heptafluoroisopropyl)tetrafluorophosphate

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