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    • 1. 发明申请
    • Solid polycrystalline potassium ion conductor having a beta
    • 具有β“-Al 2 O 3结构的固体多晶钾离子导体,其生产和使用该钾离子导体制备金属钾
    • US20060131181A1
    • 2006-06-22
    • US11300473
    • 2005-12-15
    • Kerstin Schierle-ArndtGunther HuberStephen HeavensJohn BlackburnIvor Jones
    • Kerstin Schierle-ArndtGunther HuberStephen HeavensJohn BlackburnIvor Jones
    • C25C3/02
    • C25C3/02C04B35/113C04B2235/3201C04B2235/3203C04B2235/3206C04B2235/3217C04B2235/3244C04B2235/94C04B2235/96
    • A solid polycrystalline potassium ion conductor having a β″-Al2O3 structure is obtainable by means of ion exchange of the alkali metal ions of a polycrystalline alkali metal β″-Al2O3 moulding, in which the alkali metal ions are sodium ions or a mixture of sodium and potassium ions and the molar ratio M2O (M=alkali metal) to Al2O3 is 1: x, x being an integer or non-integer number within the range 5 to 11, for potassium ions, the ion exchange being effected by a method wherein neither chloride-containing nor liquid potassium ion sources are used, the method comprising the steps of: embedding the polycrystalline alkali metal β″-Al2O3 moulding in an oxidic powder containing potassium and aluminium of a molar K2O: Al2O3 ratio within the range of 1: (x−1) to 1: (x+1), the weight of oxidic powder amounting to at least two times the weight of the moulding; heating the embedded moulding at a rate of at least 100° C. per hour to at least 1100° C.; and further heating to at least 1300° C., this temperature being maintained for at least one hour prior to cooling. Potassium metal is obtained, starting from potassium amalgam, by electrolysis using an anode containing potassium amalgam, liquid potassium metal as a cathode and this solid potassium ion conductor as a membrane separating cathode and anode spaces.
    • 通过离子交换多晶碱金属β'的碱金属离子获得具有β“-Al 2 O 3结构的固体多晶钾离子导体, 其中碱金属离子是钠离子或钠离子和钾离子的混合物,摩尔比M 2 O 3 / O(M =碱金属)至Al 2 O 3 3为1:x,x为5至11范围内的整数或非整数,对于 钾离子,离子交换通过其中不使用含氯化物或液体钾离子源的方法进行,该方法包括以下步骤:将多晶碱金属β“-Al 2 O 在含有摩尔K 2 O 3:O 2 Al 3 O 3比例的钾和铝的氧化粉末中成型3次/ 在1:(x-1)至1:(x + 1)的范围内,氧化粉末的重量至少为模具重量的两倍 ; 以至少100℃/小时的速度将嵌入的模制件加热至至少1100℃; 并进一步加热至至少1300℃,该温度在冷却之前保持至少1小时。 从汞齐汞合金开始,通过使用含有汞齐汞合金,液态金属钾作为阴极的阳极进行电解,得到金属钾,该固体钾离子导体作为隔离阴极和阳极空间的膜。