Magnesium hydride (MgH₂) is a high-capacity anode material for lithium ion batteries, which suffers from poor cycling stability. In this study, we describe a thermal plasma-based approach to prepare homogeneous MgH₂/C nanocomposites with very high cycling stability. In this process, magnesium evaporation is coupled with carbon generation from the plasma decomposition of acetylene, leading to a homogeneous Mg/C nanocomposite, which can be easily converted to MgH₂/C by hydrogenation. The MgH₂/C nanocomposite achieves a high reversible capacity of up to 620 mAh•g^–1 after 1,000 cycles with an ultralow decay rate of only 0.0036% per cycle, which represents a significantly improved performance compared to previous results.

中文翻译：

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等离子处理的均质氢化镁/碳纳米复合材料，可实现高度稳定的锂存储

氢化镁（MgH ₂）是用于锂离子电池的高容量负极材料，其循环稳定性差。在这项研究中，我们描述了一种基于热等离子体的方法来制备具有非常高的循环稳定性的均相MgH ₂ / C纳米复合材料。在此过程中，镁的蒸发与乙炔的等离子分解产生的碳结合在一起，导致形成均质的Mg / C纳米复合材料，该复合材料很容易通过氢化转化为MgH ₂ / C。MgH ₂ / C纳米复合材料可实现高达620 mAh•g ^–1的高可逆容量 经过1,000次循环后，每个循环的超低衰减率仅为0.0036％，与以前的结果相比，它的性能大大提高。