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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Phenyl-rich silicone oil as a precursor for SiOC anode materials for long-cycle and high-rate lithium ion batteries
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Phenyl-rich silicone oil as a precursor for SiOC anode materials for long-cycle and high-rate lithium ion batteries

机译：富含苯基的硅油作为长寿命和高倍率锂离子电池SiOC负极材料的前体

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摘要

Silicon oxycarbide (SiOC) is gaining increasing attention as a promising anode material for lithium ion batteries due to its higher reversible capacity compared to incumbent graphite. The kinetic processes at a SiOC anode result in rapid capacity fading even at a relatively low current density, thereby hindering its commercialization. Herein, a distinctive, phenyl-rich silicone oil is used as a precursor for producing SiOC anode materials via simple pyrolysis. We find that only silicone oil with phenyl-rich rings can be converted into SiOC materials. The phenyl group was crucial for carbon incorporation to allow Si-O-C bonding and the formation of a free-carbon phase. The resulting SiOC anode exhibited stable cyclability up to 250 cycles, with a discharge capacity of 800 mA h g(-1) at a current density of 200 mA g(-1). The remarkable cycle performance of SiOC was correlated with its low dimensional expansion (7%) during lithiation, which maintains its structure over cycling. Rate capability tests showed a highly stable performance with a maximum discharge capacity of 852 mA h g(-1) at a current density of 100 mA g(-1). When the discharge current density was increased 64-fold, the reversible capacity of the SiOC anode was 90% of its maximum capacity, 772 mA h g(-1). The excellent electrochemical performance of SiOC could be attributed to the rapid mobility of Li+ within the SiOC matrix, as indicated by a Li+ diffusion coefficient of 5.1 x 10(-6) cm(2) s(-1).
机译：碳氧化硅（SiOC）作为锂离子电池的有希望的负极材料，由于与现有的石墨相比具有更高的可逆容量，因此越来越受到关注。即使在相对较低的电流密度下，SiOC阳极上的动力学过程也会导致快速容量衰减，从而阻碍其商业化。在本文中，独特的，富含苯基的硅油被用作通过简单的热解生产SiOC阳极材料的前体。我们发现只有具有富苯基环的硅油才能转化为SiOC材料。苯基对于碳结合至关重要，以允许Si-O-C键和形成自由碳相。所得的SiOC阳极在250个循环中表现出稳定的循环能力，在200 mA g（-1）的电流密度下的放电容量为800 mA h g（-1）。 SiOC出色的循环性能与其在锂化过程中的低尺寸膨胀（7％）相关，这可以保持其在循环过程中的结构。速率能力测试显示出高度稳定的性能，在100 mA g（-1）的电流密度下的最大放电容量为852 mA h g（-1）。当放电电流密度增加64倍时，SiOC阳极的可逆容量为其最大容量772 mA h g（-1）的90％。 SiOC优异的电化学性能可归因于Li +在SiOC基质中的快速迁移，如Li x扩散系数为5.1 x 10（-6）cm（2）s（-1）所示。

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