Nanometer-sized LiMn_0.8Fe_0.2PO₄ (nano-LMFP) is one of the most suitable LiMnPO₄ derived cathode materials to maximize gravimetric capacity and rate capability. However, the poor cycling performance, low volumetric energy density and safety hazards of nano-LMFP limit its large-scale commercialization. To overcome these development bottlenecks, a uniform three-dimensional interconnected conductive carbon network modified LiMn_0.8Fe_0.2PO₄ nanoporous micro-agglomerated (micro-LMFP/C) composite was synthesized via a three-step solid-state reaction (3S) combined with three-step carburizing (3C) and two-step pore-forming (2P). The novel micro-LMFP/C composite exhibits excellent gravimetric/volumetric reversible capacities, weak electrochemical polarization and high rate capability. Even if increased to 20C, a satisfactory discharge capacity of 92.5 mA h g⁻¹ (70.2% of the initial value at 0.1C) and an outstanding discharge plateau of 3.76 V can be observed. More importantly, for the 3S synthetic strategies, the novel 3C2P-assisted synthesis of micro-LMFP/C composites can simultaneously deliver 2.6 and 1.5 times higher volumetric capacity than that of synchronous and stepwise carburizing assisted synthesis of samples, respectively.

中文翻译：

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合理设计合成策略，渗碳方法和孔形成方式，以释放微团聚的LiMn _0.8 Fe _0.2 PO ₄正极材料的循环可逆性和速率能力†

纳米尺寸的LiMn _0.8 Fe _0.2 PO ₄（纳米LMFP）是最适合LiMnPO ₄衍生的阴极材料之一，可最大程度地提高重量分析能力和倍率分析能力。然而，纳米LMFP的不良循环性能，低体积能量密度和安全隐患限制了其大规模的商业化。为了克服这些发展瓶颈，通过以下方法合成了均匀的三维互连导电碳网络改性的LiMn _0.8 Fe _0.2 PO ₄纳米多孔微团聚（micro-LMFP / C）复合材料。三步固相反应（3S）与三步渗碳（3C）和两步成孔（2P）相结合。新型的微型LMFP / C复合材料表现出优异的重量/体积可逆容量，弱电化学极化和高倍率容量。即使增加到20C，也可以观察到令人满意的92.5 mA hg ^-1的放电容量（0.1C时为初始值的70.2％）和3.76 V的出色放电平稳性。更重要的是，对于3S合成策略，新型3C2P辅助的微型LMFP / C复合材料可以同时提供比同步和逐步渗碳辅助样品合成高2.6和1.5倍的容积。