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首页> 外文期刊>Advanced energy materials >High-Rate and Long Cycle-Life Alloy-Type Magnesium-Ion Battery Anode Enabled Through (De)magnesiation-Induced Near-Room-Temperature Solid–Liquid Phase Transformation
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High-Rate and Long Cycle-Life Alloy-Type Magnesium-Ion Battery Anode Enabled Through (De)magnesiation-Induced Near-Room-Temperature Solid–Liquid Phase Transformation

机译：通过（去）放大倍率引起的近室温固液相变实现高速率和长寿命的合金型镁离子电池阳极

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摘要

Resources used in lithium-ion batteries are becoming more expensive due to their high demand, and the global cobalt market heavily depends on supplies from countries with high geopolitical risks. Alternative battery technologies including magnesium-ion batteries are therefore desirable. Progress toward practical magnesium-ion batteries are impeded by an absence of suitable anodes that can operate with conventional electrolyte solvents. Although alloy-type magnesium-ion battery anodes are compatible with common electrolyte solvents, they suffer from severe failure associated with huge volume changes during cycling. Consequently, achieving more than 200 cycles in alloy-type magnesium-ion battery anodes remains a challenge. Here an unprecedented long-cycle life of 1000 cycles, achieved at a relatively high (dis)charge rate of 3 C (current density: 922.5 mA g(-1)) in Mg2Ga5 alloy-type anode, taking advantage of near-room-temperatures solid-liquid phase transformation between Mg2Ga5 (solid) and Ga (liquid), is demonstrated. This concept should open the way to the development of practical anodes for next-generation magnesium-ion batteries.
机译：锂离子电池中使用的资源由​​于需求量大而变得越来越昂贵，全球钴市场严重依赖来自地缘政治风险高的国家的供应。因此，期望包括镁离子电池的替代电池技术。由于缺少可以与常规电解质溶剂一起使用的合适的阳极，阻碍了向实用镁离子电池的发展。尽管合金型镁离子电池负极可与常见的电解质溶剂兼容，但它们会因循环过程中体积发生巨大变化而遭受严重破坏。因此，在合金型镁离子电池阳极中实现200个以上的循环仍然是一个挑战。在此情况下，Mg2Ga5合金型阳极在3 C的较高（放电）放电速率（电流密度：922.5 mA g（-1））下实现了1000次循环的空前长寿命，并利用了接近室温的优势。证明了Mg2Ga5（固体）和Ga（液体）之间的固-液相转变。这个概念应该为开发下一代镁离子电池的实际阳极开辟道路。

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