Data from: MnO2–graphene nanosheets wrapped mesoporous carbon/sulfur composite for lithium–sulfur batteries

The lithium-sulfur battery has received intense interest due to its achievable high energy density and low cost sulfur. However, fast capacity retention after a prolonged cycles is the main challenge. Here, we report to synthesis MnO2-graphene nanosheets coated mesoporous carbon/sulfur composite (MGN@MC/S) as cathodes in the Li-S battery. The MGN@MC/S electrode exhibits excellent electrochemical performance, with high reversible specific capacity and rate capability (1475 mA h g-1 at 0.1 C and 748 mA h g-1 at 1 C ), and long-cycle ability (0.042 % capacity decay per cycle over more than 450 cycles at 1 C).锂硫电池（lithium-sulfur battery）凭借其可实现的高能量密度与低成本的硫原料，受到了广泛关注。然而，长循环过程中快速的容量衰减是其面临的核心挑战。本文报道了一种合成二氧化锰（MnO₂）-石墨烯纳米片（graphene nanosheets）包覆介孔碳（mesoporous carbon）/硫复合物（MGN@MC/S）的方法，并将其作为锂硫电池的正极材料。该MGN@MC/S正极展现出优异的电化学性能，具备较高的可逆比容量与倍率性能：在0.1 C倍率下可达1475 mA·h·g⁻¹，1 C倍率下可达748 mA·h·g⁻¹；同时具备出色的长循环稳定性，在1 C倍率下进行超过450次循环后，每周期容量衰减仅为0.042%。