The present invention relates to an allyl phosphazene-based cross-linking agent, and a semi-interpenetrating polymer network (IPN)-type all-solid-state polymer electrolyte composition including the same. The semi-IPN-type all-solid-state polymer electrolyte composition according to the present invention reduces crystallization of an ethylene oxide group of a plasticizer even at low (room) temperature, so ion conductivity is remarkably improved and electrochemical stability and battery properties are excellent. Accordingly, the semi-IPN-type all-solid-state polymer electrolyte composition may be usefully used as an all-solid-state polymer electrolyte of a lithium-polymer secondary battery, a dye-sensitized solar cell, etc.
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