Enhancing the electron/ion transfer ability of Li₄Ti₅O₁₂ materials is very important to achieve advanced high-rate and long-life anode in lithium ion batteries (LIBs). Here, for the first time, we report Li₄Ti₅O₁₂/nitrogen, sulfur co-doped porous graphene composites (LTO/N, S-PG) via one-step facile calcination and activation process by using LiOH as Li source and activating agent. Mechanisms underlying the beneficial effects of N, S co-doped graphene for LTO anode were substantiated by the Density Functional Theory (DFT) calculations, revealing that co-doped N and S atoms not only significantly facilitate Li⁺ adsorption, but also ameliorate Li⁺ diffusion in graphene. Furthermore, the synergistic effects of nanosized LTO and porous graphene endow the composites with efficient Li⁺ diffusion channels and electron-conductive networks. Therefore, the LTO/N, S-PG can deliver extraordinarily high rate capability (e.g. 130 mA h g^-1 at 80 C and 123 mA h g^-1 at 100 C), and excellent cycling stability (83.1% capacity retention after 4000 cycles at 20 C). In addition, their superior electrochemical performance was also demonstrated in the full cells with LiNi_0.5Mn_1.5O₄ cathode, which displayed 89.5% capacity retention after 500 cycles at 5 C. These results suggest the great promise of using the LTO/N, S-PG as a novel anode material for high-rate and long-life LIBs.

增强Li ₄ Ti ₅ O ₁₂材料的电子/离子转移能力对于实现锂离子电池（LIBs）中先进的高速率，长寿命阳极非常重要。在这里，我们首次使用LiOH作为Li源，通过一步煅烧和活化过程，报告了Li ₄ Ti ₅ O ₁₂ /氮，硫共掺杂多孔石墨烯复合材料（LTO / N，S-PG）。活化剂。密度泛函理论（DFT）计算证实了N，S共掺杂石墨烯对LTO阳极有益作用的机理，揭示了N，S共掺杂原子不仅显着促进了Li ^+的吸附，而且改善了Li⁺在石墨烯中的扩散。此外，纳米级LTO和多孔石墨烯的协同作用使复合材料具有有效的Li ⁺扩散通道和电子导电网络。因此，LTO / N，S-PG可以提供超高的倍率能力（例如，在80 C时为130 mA hg ^-1和在100 C时为123 mA hg ^-1），以及出色的循环稳定性（在40℃循环4000次后，容量保持率为83.1％ 20 C）。此外，在LiNi _0.5 Mn _1.5 O ₄的全电池中也证明了其优异的电化学性能。 阴极，在5 C下500次循环后显示89.5％的容量保持率。这些结果表明使用LTO / N，S-PG作为高倍率和长寿命LIB的新型阳极材料的巨大前景。