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首页> 外文期刊>RSC Advances >High rate capabilities of HF-etched SiOC anode materials derived from polymer for lithium-ion batteries
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High rate capabilities of HF-etched SiOC anode materials derived from polymer for lithium-ion batteries

机译：锂离子电池聚合物衍生的HF蚀刻的SiOC阳极材料的高倍率能力

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摘要

Polymer-derived silicon oxycarbide (SiOC) composites have recently attracted considerable attention because of their potential as high capacity electrode for rechargeable lithium ion batteries. However, low discharge capacity at large current densities hinders its practicality. In this work, SiOC compound as anode materials is synthesized by pyrolyzing polycarbosilane with a cyclic tetramethyl tetravinyl cyclotetrasiloxane, followed by etching with HF. The obtained SiOC delivers high reversible capacities of 321, 274 and 206 mA h g(-1) and high capacity retention of 100%, 93.4% and 68% at current densities of 1000, 2000 and 4000 mA g(-1) after 200 cycles, respectively. The excellent electrochemical properties can be attributed to the increased specific surface area, enlarged volume of nano-sized pores and F-doped silicon unit in the HF-etching process, which benefit the contact between active material and electrolyte, alleviate the volume change during discharge/charge process and raise the ionic conductivity.
机译：聚合物衍生的碳氧化硅（SiOC）复合材料由于其作为可再充电锂离子电池的高容量电极的潜力而备受关注。但是，大电流密度下的低放电容量阻碍了其实用性。在这项工作中，通过将聚碳硅烷与环状四甲基四乙烯基环四硅氧烷热解，然后用HF蚀刻，来合成作为负极材料的SiOC化合物。所获得的SiOC在200次循环后的电流密度分别为1000、2000和4000 mA g（-1）时可提供321、274和206 mA hg（-1）的高可逆容量，以及100％，93.4％和68％的高容量保持率， 分别。优异的电化学性能可归因于HF蚀刻过程中增加的比表面积，纳米孔的增大体积和F掺杂的硅单元，这有利于活性材料与电解质之间的接触，减轻了放电过程中的体积变化/充电过程并提高离子电导率。

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