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Crossover Effects in Batteries with High-Nickel Cathodes and Lithium-Metal Anodes

机译：高镍阴极和锂金属阳极电池中的交叉影响

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摘要

It is well understood that cathode-to-anode crossover, especially of transition-metal ions, can significantly impact the long-term cycling of lithium-ion batteries. The dissolved transition-metal ions in lithium-ion cells deposit on the graphite anode, disrupt the solid-electrolyte interphase (SEI), and catalyze further side reactions. Meanwhile, crossover effects in lithium-metal batteries have rarely been studied. This study is the first to investigate crossover effects in lithium-metal batteries with high-nickel layered-oxide cathodes. It is shown that the crossover of transition-metal ions from LiNi0.9Mn0.05Co0.05O2 has minimal effect on the lithium-metal anode (LMA) due to the following reasons. The catalytic transition metals 1) have less effect on an inherently reactive LMA, 2) are diluted in a thicker SEI, and 3) are produced in overall lower quantity due to the limited cycle life of the LMA. Conversely, the LMA generates soluble decomposition products that cross over to the cathode even during early cycling. This crossover accelerates impedance growth and capacity fade at the cathode and is partially responsible for the mismatch between the performance of half and full-cells with layered-oxide cathodes. This study highlights the need for better battery design with LMA, potentially including electrolyte or cell modifications.
机译：但是很好理解的是，阴极与阳极交叉，尤其是过渡金属离子，可以显著影响的锂离子电池的长期循环。在石墨阳极的锂离子电池存款溶解的过渡金属离子，破坏固体电解质界面（SEI），和催化进一步的副反应。与此同时，在金属锂电池交叉影响却很少被研究。本研究是首次以调查金属锂电池具有高镍层状氧化物阴极的交叉影响。结果表明，过渡金属离子从LiNi0.9Mn0.05Co0.05O2交叉对锂金属阳极（LMA）的影响最小，由于以下的原因。催化过渡金属1）具有的影响较小上固有的反应性LMA，2）更厚的SEI稀释，以及3）在整体较低的量产生由于LMA的有限循环寿命。相反地​​，LMA生成，即使在早期循环跨越到阴极可溶性分解产物。此交叉在阴极加速阻抗生长和容量衰减和部分地负责一半和全电池的性能与层状氧化物阴极之间的不匹配。该研究强调了更好的电池设计与LMA，其中可能包含电解质或细胞的修改的需要。

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