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1. 发明授权

US06197205B1 Electrolytic solution for lithium cell and method for producing same 有权
标题翻译：锂电池用电解液及其制造方法
公开(公告)号：US06197205B1
公开(公告)日：2001-03-06
申请号：US09572887
申请日：2000-05-18
申请人： Shouichi Tsujioka , Mituo Takahata , Hisakazu Itou , Tadayuki Kawashima , Keiji Sato , Hiromi Sasaki , Sunao Yamamoto
发明人： Shouichi Tsujioka , Mituo Takahata , Hisakazu Itou , Tadayuki Kawashima , Keiji Sato , Hiromi Sasaki , Sunao Yamamoto
IPC分类号： C02F176
CPC分类号： H01M10/052 , C01D15/005 , H01M6/162 , H01M6/164 , H01M6/166 , H01M6/168 , H01M10/0566
摘要： The present invention relates to a method for producing an electrolytic solution containing a solute of lithium hexafluorophosphate. This method includes a step of (a) reacting lithium fluoride with phosphorus pentafluiride, in a nonaqueous organic solvent that is used for producing a lithium cell's electrolytic solution, thereby to form the lithium hexafluorophosphate dissolved in the solvent. According to this method, both yield and purity of the reaction product are sufficiently high, and the reaction can easily be managed. According to need, after the step (a), the nonaqueous organic solvent may be replaced with another nonaqueous organic solvent. The present invention further relates to a method for purifying an electrolytic solution used for a lithium cell. This electrolytic solution contains an acid impurity having at least one hydrogen atom in the molecule. this method includes steps of (a) adding at least one hydrogen-free halide selected from chlorides, bromides and iodides, to the electrolytic solution, such that the acid impurity is reacted with the at least one hydrogen-free halide, thereby to form at least one hydrogen halide selected from hydrogen chloride, hydrogen bromide and hydrogen iodide; and (b) purging the at least one hydrogen halide from the electrolytic solution to purify the electrolytic solution. The acid impurity concentration of the electrolytic solution is substantially reduced by this method.
摘要翻译：本发明涉及含有六氟磷酸锂的溶质的电解液的制造方法。该方法包括以下步骤：（a）在用于制备锂电池的电解液的非水有机溶剂中使氟化锂与五氟乙酸磷反应，从而形成溶解在溶剂中的六氟磷酸锂。根据该方法，反应产物的产率和纯度均足够高，反应容易。根据需要，在（a）工序之后，非水系有机溶剂可以用其他非水有机溶剂代替。本发明还涉及用于锂电池的电解液的净化方法。该电解液含有分子中具有至少一个氢原子的酸性杂质。该方法包括以下步骤：（a）将至少一种选自氯化物，溴化物和碘化物的无氢卤化物加入到电解溶液中，使得酸杂质与至少一种无氢卤化物反应，从而形成选自氯化氢，溴化氢和碘化氢中的至少一种卤化氢; 和（b）从所述电解液中清除所述至少一种卤化氢以净化所述电解液。通过该方法，电解液的酸性杂质浓度明显降低。

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