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High rate capability by sulfur-doping into LiFePO4 matrix

机译：通过硫掺杂到LiFePO4基体中实现高倍率生产

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摘要

Enhanced electrochemical performance of LiFePO _(4) for Li-ion batteries has been anticipated by anion doping at the O-site rather than cation doping at the Fe-site. We report on the electrochemical performance of S-doped LiFePO _(4) nanoparticles synthesized by a solvothermal method using thioacetamide as a sulfur source. S-doping into the LiFePO _(4) matrix expands the lattice due to the larger ionic radius of S ~(2?) than that of O ~(2?) . The lattice parameters a and b increase by around 0.2% with sulfur content, while that of c remains almost unchanged with only 0.03% increase. The S-doping also contributes to the suppression of antisite defects (Fe occupying Li sites), which facilitates the easy migration of Li in the diffusion channels without blockage. Owing to these effects of S-doping, the S-doped LiFePO _(4) nanoparticles show enhanced electrochemical properties with a high discharge capacity of ～113 mA h g ~(?1) even at a high rate of 10C.
机译：通过在O部位掺杂阴离子而不是在Fe部位掺杂阳离子，可以预见LiFePO_（4）用于锂离子电池的电化学性能会提高。我们报告了通过溶剂热法使用硫代乙酰胺作为硫源合成的S掺杂LiFePO _（4）纳米粒子的电化学性能。由于S〜（2？）的离子半径大于O〜（2？）的离子半径，所以将S掺杂到LiFePO_（4）矩阵中会使晶格扩展。晶格参数a和b随着硫含量增加约0.2％，而c的晶格参数几乎保持不变，仅增加0.03％。 S掺杂还有助于抑制反位缺陷（Fe占据Li位），这有助于Li容易地在扩散通道中迁移而不会被阻塞。由于S掺杂的这些影响，即使在10C的高速率下，S掺杂的LiFePO_（4）纳米颗粒也表现出增强的电化学性能，具有约113 mA h g〜（？1）的高放电容量。

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