Abstract: A tin oxide-containing polymer composite material, a process for production thereof, and use thereof for production of tin-carbon composite material containing: an inorganic tin-containing phase; and a carbon phase. Additionally, a compound of formula (I): R1—X—Sn—Y—R2 (I), wherein: R1 is an Ar—C(Ra,Rb)— radical where Ar is an aromatic or heteroaromatic ring optionally containing 1 or 2 substituents; Ra and Rb are each independently hydrogen or methyl, or together are an oxygen atom or a methylidene group (?CH2); R2 is C1-C10-alkyl, C3-C8-cycloalkyl, or R1; or R1 together with R2 is a radical of the formula A: wherein: A is an aromatic or heteroaromatic ring fused to the double bond; m is 0-2; each R radical is independently selected from halogen, CN, C1-C6-alkyl, C1-C6-alkoxy, and phenyl, Ra, Rb are as in formula (1); X is O, S or NH; and Y is O, S or NH.