The present disclosure relates to organosilicon preceramic resin compositions for forming porous polymer-derived ceramic materials. It also relates to porous organosilicon polymer-derived ceramic materials, and methods for forming porous organosilicon polymer-derived ceramic materials.

A single-ion conducting material comprising a plurality of units of formula (I): (I) wherein X is Al or B; M is a cation; the single-ion conducting material comprises X groups of formula (I) linked by a group of formula (II) wherein n is greater than 1 and each R1 independently is an organic residue: (II) and the single-ion conducting material comprises X groups of formula (I) substituted with at least one group of formula OR.sup.2 wherein R.sup.2 is an organic substituent which is not bound a further X. The single-ion conductive material may be used in a metal battery or metal ion battery.

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