全氟二异丙基膦酸锂的合成及其电化学性能研究

以合成的氯代二异丙基膦为原料, 利用电化学全氟化方法, 得到全氟二异丙基膦酸锂(Li(C3F7)2PF4]), 并对其物理和电化学性能进行了研究.

Synthesis and Electrochemical Properties of Lithium Bis(heptafluoroisopropyl)tetrafluorophosphate

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(C_3F_7)_2PF_4] was received by Simons process from diisopropylchlorophosphane in this paper.As an electrolyte of Li ion secondary cell,Li(C_3F_7)_2PF_4] had lower vapor pressure than LiPF_6 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(C_3F_7)_2PF_4] has an excellent stability towards hydrolysis.The synthesis process is safe and easily controlled.