Addition of PVDF to LiTFSI–PEO solid electrolytes enables preparation of free-standing films with the compositions within the so called “crystallinity gap” of LiTFSI–PEO system. Such films possess ionic conductivity of about 0.3 mS cm−1 at 60 °C.
The types of heat accumulation and the types of heat-accumulating materials are considered. It is shown that the most promising as heat-accumulating materials for heating and hot water are the salts hydrates. Based on the conducted factor analysis, a number of criteria are excluded from further consideration, which significantly reduces the list of criteria considered for selecting phase change materials (PCM) and simplifies further work on the selection of the most promising materials. There were selected from over 160 salt hydrates as PCM for the future of composite synthesis for the heating and hot water the Na (CH3COO) •3H2O, Ba (OH)2•8H2O, Mg (NO3)2 •6H2O and Zn (NO3)2•6H2O.
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