The poor thermal stability and high sensitivity severely hinder the practical application of hexanitrohexaazaisowurtzitane (CL-20). Herein, a kind of novel core@double-shell CL-20 based energetic composites were fabricated to address the above issues. The coordination complexes which consist of natural polyphenol tannic acid (TA) and FeIII<\/sup>\u00a0were chosen to construct the inner shell, while the graphene sheets were used to build the outer shell. The resulting CL-20\/TA-FeIII<\/sup>\/graphene composites exhibited simultaneously improved thermal stability and safety performance with only 1\u202fwt% double-shell content, which should be ascribed to the intense physical encapsulation effect from inner shell combined with the desensitization effect of carbon nano-materials from outer shell. The phase transition (\u03b5 to \u03b3) temperature increased from 173.70\u202f\u00b0C of pure CL-20 to 191.87\u202f\u00b0C of CL-20\/TA-FeIII<\/sup>\/graphene composites. Meanwhile, the characteristic drop height (H50<\/sub>) dramatically increased from 14.7\u202fcm of pure CL-20 to 112.8\u202fcm of CL-20\/TA-FeIII<\/sup>\/graphene composites, indicating much superior safety performance after the construction of the double-shell structure. In general, this work has provided an effective and versatile strategy to conquer the thermal stability and safety issues of CL-20 and contributes to the future application of high energy density energetic materials.<\/p>\n
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