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Novel Hoberman Sphere Design for Interlaced Mn3O4@CNT Architecture with ALD Coated TiO2 Overlayer as Advanced Anodes in Li-ion Battery.

Hoberman Sphere is a stable and stretchable spacial structure with unique design concept, which can be taken as the ideal prototype of the internal mechanical/conductive skeleton for the anode with large volume change. Herein, Mn3O4 nanoparticles are interlaced with Hoberman Sphere-like interconnected CNT-network via a facile self-assembly strategy, in which Mn3O4 can "local expansion" in the CNT network, limit the volume expansion to the interior space, and maintain a stable outer surface of the hybrid particle. Furthermore, an ultra-thin uniform ALD coated TiO2 shell is adopted to stabilize the solid-electrolyte interphase (SEI), provide high electron conductivity and lithium ion (Li+) diffusivity with lithiated LixTiO2, as well as enhance the reaction kinetics of the Mn3O4 by a "electron-density enhancement effect". With this design, the Mn3O4@CNT/TiO2 exhibit a high capacity of 1064 mAh g-1 at 0.1 A g-1, a stable cycling stability over 200 cycles, a superior rate capability, and a commercial-level areal capacity of 4.9 mAh cm-2. In this way, a novel electrode design strategy is achieved by the Hoberman Sphere-like CNT design along with the in-situ porous formation, which can not only achieve a high-performance anode for LIBs, but can be widely adapted in a variety of advanced electrode materials for alkali metal ion batteries.