LiOH·H2O (Wako Pure
Chemical Industries, Ltd.), LiCl·H2O (99.9%, Wako
Pure Chemical Industries, Ltd.), Li2CO3 (Wako
Pure Chemical Industries, Ltd.), and Ca(OH)2 (99.9%, FUJIFILM
Wako Pure Chemical Corporation) were used to prepare
Ca(OH)2 with Li compounds being added. LiOH/Ca(OH)2, LiCl/Ca(OH)2, Li2CO3/Ca(OH)2, LiOH/LiCl/Ca(OH)2, LiCl/Li2CO3/Ca(OH)2, and LiCl/Li2CO3/Ca(OH)2 were prepared by the impregnation method.14 (link)−18 (link),32 (link),33 (link) First, an aqueous solution of Li compounds was prepared from LiOH
and/or LiCl and/or Li2CO3 and ultrapure water.
The solution was impregnated with pure Ca(OH)2 powder and
stirred for 30 min. After this, water was evaporated at 40 °C
using a rotary evaporator. Finally, the samples were dried overnight
at 120 °C. All the samples were obtained as a white powder. For
comparison, Ca(OH)2 and Mg(OH)2 without Li compound
addition were also prepared in the same way. Ca(OH)2 and
Mg(OH)2 without added Li compounds are expressed as Ca(OH)2-w and Mg(OH)2-w, respectively. Table 6 shows the prepared samples
and the ratio of the additive.