Carbon nanomaterials with 3D structures as sulfur hosts have been widely developed in lithium–sulfur batteries because of their high specific surface area, high conductivity and structural stability. However, sulfur, loaded by melting-diffusion method, is usually attached to the outside surface of carbon host, resulting in weak adsorption to expose polysulfide. Herein, we report a template-free method for synthesizing graphene-like nano-cell (GLC) with high in situ sulfur loading (S@GLC). The GLC is expected to provide physical adsorption by enclosed graphene cell architecture and chemical adsorption by pyridinic N-doping and oxygen functional group. With these merits, the S@GLC cathode owned high sulfur content (72%) and also, it exhibited a reversible specific capacity of 1253 mA h g⁻¹ at 0.2C, excellent rate performance, and long cycling stability (502 mA h g⁻¹ after 400 cycles at 1C).

中文翻译：

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Li-S电池的无模板法原位加载石墨烯状纳米电池中的硫†

具有3D结构作为硫主体的碳纳米材料因其高的比表面积，高的电导率和结构稳定性而在锂硫电池中得到了广泛的开发。然而，通过熔融扩散法负载的硫通常附着在碳主体的外表面上，导致吸附较弱，从而暴露出多硫化物。在此，我们报告了一种无模板的方法，用于合成具有高原位硫载量（S @ GLC）的石墨烯样纳米电池（GLC）。预计GLC将通过封闭的石墨烯电池结构提供物理吸附，并通过吡啶N掺杂和氧官能团提供化学吸附。凭借这些优点，S @ GLC阴极具有较高的硫含量（72％），并且其可逆比容量为1253 mA hg ^-1在0.2C的温度下，具有出色的倍率性能，并且具有长的循环稳定性（在1C下经过400次循环后，502 mA hg ^-1）。