Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 5, Pages 4320-4325Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b07961
Keywords
cobaltosic oxide; ultrathin nanosheet; encapsulation matrix; lithium-sulfur battery; affinity to polysulfides; DFT calculations
Funding
- Australian Research Council (ARC) Discovery project [DP1094261]
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Two-dimensional ultrathin cobaltosic oxide nanosheets with numerous geometrical holes were synthesized by the hydrothermal method, and further used as an effective encapsulation matrix for sulfur and polysulfides in lithium sulfur batteries. The cobaltosic oxide/sulfur nanosheet composite electrode exhibits high Coulombic efficiency (99%), a suppressed shuttle effect, and a reversible capacity of 656 mA h g(-1) at 0.2 C after 200 cycles, with small capacity fading of 0.219% per cycle, whereas its carbon sulfur electrode counterpart only retains a capacity of 386 mA h g(-1) after 100 cycles. The improved performance is attributed to the strong chemical interaction between polysulfides and cobaltosic oxide, and its facile ionic transport and enhanced reaction kinetics, which can effectively control the diffusion of polysulfides and keep them within the cathode region, leading to good electrochemical stability.
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