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Silicon oxycarbide-antimony nanocomposites for high-performance Li-ion battery anodes.
Nanoscale ( IF 5.8 ) Pub Date : 2020-06-10 , DOI: 10.1039/d0nr02930k Romain J-C Dubey 1 , Pradeep Vallachira Warriam Sasikumar 2 , Noemi Cerboni 1 , Marcel Aebli 1 , Frank Krumeich 3 , Gurdial Blugan 2 , Kostiantyn V Kravchyk 1 , Thomas Graule 2 , Maksym V Kovalenko 1
Nanoscale ( IF 5.8 ) Pub Date : 2020-06-10 , DOI: 10.1039/d0nr02930k Romain J-C Dubey 1 , Pradeep Vallachira Warriam Sasikumar 2 , Noemi Cerboni 1 , Marcel Aebli 1 , Frank Krumeich 3 , Gurdial Blugan 2 , Kostiantyn V Kravchyk 1 , Thomas Graule 2 , Maksym V Kovalenko 1
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Silicon oxycarbide (SiOC) has recently regained attention in the field of Li-ion batteries, owing to its effectiveness as a host matrix for nanoscale anode materials alloying with Li. The SiOC matrix, itself providing a high Li-ion storage capacity of 600 mA h g−1, assists in buffering volumetric changes upon lithiation and largely suppresses the formation of an unstable solid-electrolyte interface. Herein, we present the synthesis of homogeneously embedded Sb nanoparticles in a SiOC matrix with the size of 5–40 nm via the pyrolysis of a preceramic polymer. The latter is obtained through the Pt-catalyzed gelation reaction of Sb 2-ethylhexanoate and a poly(methylhydrosiloxane)/divinylbenzene mixture. The complete miscibility of these precursors was achieved by the functionalization of poly(methylhydrosiloxane) with apolar divinyl benzene side-chains. We show that anodes composed of SiOC/Sb exhibit a high rate capability, delivering charge storage capacity in the range of 703–549 mA h g−1 at a current density of 74.4–2232 mA g−1. The impact of Sb on the Si–O–C bonding and on free carbon content of SiOC matrix, along with its concomitant influence on Li-ion storage capacity of SiOC was assessed by Raman and 29Si and 7Li solid-state NMR spectroscopies.
中文翻译：
碳氧化锑锑纳米复合材料，用于高性能锂离子电池阳极。
碳氧化硅（SiOC）由于其作为与Li合金化的纳米级阳极材料的主体基质而有效，最近在锂离子电池领域受到了关注。SiOC基体本身可提供600 mA hg -1的高锂离子存储容量，有助于缓冲锂化时的体积变化，并在很大程度上抑制了不稳定的固体电解质界面的形成。在本文中，我们介绍了通过5–40 nm的尺寸在SiOC基质中均匀嵌入Sb纳米颗粒的合成陶瓷前聚合物的热解。后者通过Sb 2-乙基己酸酯和聚（甲基氢硅氧烷）/二乙烯基苯混合物的Pt催化胶凝反应获得。这些前体的完全可混溶性是通过将聚（甲基氢硅氧烷）与非极性二乙烯基苯侧链官能化来实现的。我们表明，由SiOC / Sb组成的阳极具有较高的倍率能力，在74.4–2232 mA g -1的电流密度下可提供703–549 mA hg -1的电荷存储容量。拉曼，29 Si和7评估了Sb对Si-O-C键和SiOC基质中游离碳含量的影响，以及其对SiOC锂离子存储能力的影响。Li固体NMR光谱学。
更新日期：2020-07-02
中文翻译：
碳氧化锑锑纳米复合材料，用于高性能锂离子电池阳极。
碳氧化硅（SiOC）由于其作为与Li合金化的纳米级阳极材料的主体基质而有效，最近在锂离子电池领域受到了关注。SiOC基体本身可提供600 mA hg -1的高锂离子存储容量，有助于缓冲锂化时的体积变化，并在很大程度上抑制了不稳定的固体电解质界面的形成。在本文中，我们介绍了通过5–40 nm的尺寸在SiOC基质中均匀嵌入Sb纳米颗粒的合成陶瓷前聚合物的热解。后者通过Sb 2-乙基己酸酯和聚（甲基氢硅氧烷）/二乙烯基苯混合物的Pt催化胶凝反应获得。这些前体的完全可混溶性是通过将聚（甲基氢硅氧烷）与非极性二乙烯基苯侧链官能化来实现的。我们表明，由SiOC / Sb组成的阳极具有较高的倍率能力，在74.4–2232 mA g -1的电流密度下可提供703–549 mA hg -1的电荷存储容量。拉曼，29 Si和7评估了Sb对Si-O-C键和SiOC基质中游离碳含量的影响，以及其对SiOC锂离子存储能力的影响。Li固体NMR光谱学。
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