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•“Two birds with one stone” strategy is raised to obtain the balanced properties.•3D micro-nanostructure of CoS2/doped carbon aerogel is rationally designed.•Such structure shows superior cycling and rate property than many metal sulfides.•Utilizing this micro-nanostructure dramatically promotes the thermal safety of cell.•The favorable Li+/Na+ storage actions and related reaction kinetics are discerned.
Up to now, lithium/sodium ion batteries (LIBs/SIBs) are deemed as the ideal candidates for traditional fossil energy. However, the absence of suitable Li+/Na+ reservoirs and the hazard of thermal runway have plagued their usages. Using Li4Ti5O12 or TiO2 anode promotes the thermal safety of LIBs/SIBs but reduce their electrochemical property. How to achieve the balanced performances has been an urgency. Here, we have delicately designed a 3D micro-nanostructure of CoS2/doped carbon aerogel (CoS2@NCA), via “killing two birds with one stone” strategy. When used as LIBs anode, CoS2@NCA delivers a high capacity of 639.5 mAh g−1 after operating at 1 A g−1 for 250 cycles, giving a low-capacity attenuation rate of 0.048 % per cycle. Meanwhile, the reduced maximum temperature and maximum heating rate of thermal runaway (TR) are observed for cell. When used as SIBs anode, CoS2@NCA delivers a high capacity of 620.9 mAh g−1 at 100th cycle as working at 1 A g−1. Likewise, the activation energy for TR is promoted. Overall, the utilization of CoS2@NCA enables the superior and safe energy storage.
The cell with CoS2@NCA anode shows better electrochemical property and superior thermal safety.
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