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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >LiFePO4/NaFe3V9O19/porous glass nanocomposite cathodes for Li+/Na+ mixed-ion batteries
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LiFePO4/NaFe3V9O19/porous glass nanocomposite cathodes for Li+/Na+ mixed-ion batteries

机译：用于Li + / Na +混合离子电池的LiFePO4 / NaFe3V9O19 /多孔玻璃纳米复合阴极

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摘要

The discovery and optimisation of high performance cathode materials are critical to future breakthroughs for next-generation rechargeabEe batteries. LiFePO4 (LFP)/NaFe3V9O19 (NFV)/Na2O-FeO-V2O3-P2O5 biocarbon (NFVPB) porous glass nanocomposites (LFP/NFV/NFVPB) offer new possibilities for Li+/Na+ mixed-ion batteries with high-rate capability and high discharge voltage plateaus. Here we have successfully synthesized these nanocomposites via self-assembEy of adenosine disodium triphosphate (Na(2)ATP) biotempEates and a carbon thermal reduction method. As a novel cathode materiat LFP/NFV/NFVPB delivers a reversible capacity of 202.8 mA h g(-1) at 0.1C in the Li+/Na+ mixed-ion cell with the electrochemically active redox reactions of Fe2+/Fe3+ and V3+/V4+, which is far higher than the theoretical capacity of LiFePO4 (170 mA h g-1). The cell exhibits two high voltage plateaus with well-defined discharge voltage near 3.4 and 3.7 volts, and a coulombic efficiency of approximately 90 percent. Because the low-energy nonequilibrium paths of the fast phase transformation process in LFP/NFV composite nanoparticles can improve the high-rate performance, the cell still exhibits a higher specific capacity of about 100.4 mA h g(-1) at 10C. These resuEts are attributed to the nanocomposite structure of LiFePO4 and NaFe3V9O19 and better percolation of electrochemically active glass with a hierarchical pore structure. This work will contribute to the development of Li+/Na+ mixed-ion batteries.
机译：高性能阴极材料的发现和优化对于下一代可充电电池的未来突破至关重要。 LiFePO4（LFP）/ NaFe3V9O19（NFV）/ Na2O-FeO-V2O3-P2O5生物碳（NFVPB）多孔玻璃纳米复合材料（LFP / NFV / NFVPB）为具有高倍率性能和高放电率的Li + / Na +混合离子电池提供了新的可能性电压高原。在这里，我们已经通过三磷酸腺苷二钠（Na（2）ATP）生物模板的自组装和碳热还原方法成功地合成了这些纳米复合材料。作为一种新型的阴极材料LFP / NFV / NFVPB在Li + / Na +混合离子电池中于0.1C时可提供202.8 mA hg（-1）的可逆容量，并且具有Fe2 + / Fe3 +和V3 + / V4 +的电化学活性氧化还原反应，远高于LiFePO4的理论容量（170 mA h g-1）。该电池具有两个高电压平稳区，其放电电压明确定义在3.4和3.7伏附近，库仑效率约为90％。由于LFP / NFV复合纳米粒子中快速相变过程的低能量非平衡路径可以改善高速率性能，因此该电池在10C时仍具有约100.4 mA h g（-1）的较高比容量。这些结果归因于LiFePO4和NaFe3V9O19的纳米复合结构以及具有分级孔结构的电化学活性玻璃的更好的渗透性。这项工作将有助于发展Li + / Na +混合离子电池。

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