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Uniform Mesoporous MnO2 Nanospheres as a Surface Chemical Adsorption and Physical Confinement Polysulfide Mediator for Lithium-Sulfur Batteries.

The actual implementation of lithium-sulfur batteries is hindered by the inferior cyclic stability and poor coulombic efficiency, stemming from the notorious shuttling of soluble polysulfide intermediates. Herein, uniform mesoporous MnO2 nanospheres were prepared using a facile self-assembly and room-temperature reaction method. As a sulfur carrier of sulfur cathodes, the versatile architecture of MnO2 not only provides a powerful chemical adsorption to anchor polysulfide intermediates on the large polar surface area but also restrains them within the nanopores by physical confinement. The mesoporous MnO2 stabilized sulfur cathode demonstrates a high initial reversible capacity of 1349.3 mAh g-1 and a capacity fading rate of 0.073% at 1.0C over 500 cycles. Furthermore, a reversible areal capacity of 2.5 mAh cm-2 was achieved with stable cycling performance at a sulfur content of 80.7%. Our work offers a facile method to build efficient sulfur cathodes for high performance sulfur cathodes.

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