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Solvothermal synthesis of pyrite FeS2 nanocubes and their superior high rate lithium storage properties

机译：溶剂热合成黄铁矿FeS2纳米晶及其优异的高速率锂储能性能

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Iron pyrite nanocubes with particle sizes of around 80-120 nm have been synthesized via a facile solvothermal method. Time-dependent characterization found that the iron(II) chloride and sulfur precursors first react to form sheet-like amorphous Fe1-xS, which transforms into pyrite FeS2 nanocubes upon further heating. As an anode material for lithium ion batteries, the as-synthesized pyrite FeS2 nanocubes were found to deliver a reversible discharge capacity of 540 mA h g(-1) after cycling for 150 cycles at a current density of 1 A g(-1). Even at higher current density of 5 A g(-1), the pyrite FeS2 electrode still managed to give a stable discharge capacity of about 220 mA h g(-1). The enhanced lithium storage properties are attributed to its higher specific surface area that can provide more lithium ion (Li+) reaction sites, leading to less polarization and better cycling performance.
机译：通过简便的溶剂热法合成了粒径约为80-120 nm的黄铁矿纳米晶。随时间变化的特征发现，氯化铁（II）和硫的前体首先反应形成片状无定形Fe1-xS，然后进一步加热将其转变为黄铁矿FeS2纳米立方体。作为锂离子电池的负极材料，发现合成后的黄铁矿FeS2纳米立方体在1 A g（-1）的电流密度下循环150次后可提供540 mA h g（-1）的可逆放电容量。即使在5 A g（-1）的较高电流密度下，黄铁矿FeS2电极仍设法提供约220 mA h g（-1）的稳定放电容量。增强的锂存储性能归因于其较高的比表面积，可以提供更多的锂离子（Li +）反应位点，从而减少极化和改善循环性能。

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