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A high-yield porous graphene/carbon nanowire (PG/CNW) composite is synthesized via in-situ chemical oxidative polymerization followed by carbonization and KOH activation.An easy and efficient vacuum-assisted impregnation followed by thermal treatment at a temperature of 350 ℃ is adopted to crystallize the SnO2 nanocrystals, realizing their embedment into the PG/CNW composite.When evaluated for the electrochemical properties in lithium ion batteries, the obtained SnO2-PG/CNW composite exhibits a high lithium storage capacity of up to 1200 mAh g-1, good cycling performance and outstanding rate capability.The preparation strategy is easy and efficient, providing a novel methodology for various types of heterogeneous nanocrystals embedded into porous matrix configuration for energy storage applications.