Abstract Silicon–carbon composites, which exhibit the advantages of both carbon and silicon materials, are regarded as the most promising anode for lithium ion battery. In this work, a composite of 3D graphene-like nanosheets/silicon wrapped by catalytic graphite (G-3DGNs-Si) was prepared via a chemical oxidation–thermal expansion strategy and high-temperature sintering method. The obvious interlinked 3D-layered spaces in 3DGNs arranged orderly can uniformly accommodate silicon nanoparticles (SiNPs). 3DGNs can relieve the volume expansion and improve the electrical conductivity of SiNPs. In addition, the catalytic graphite evenly coated on the 3DGNs-Si can further improve electrochemical performance. The G-3DGNs-Si composite anode can achieve 90% reversible capacity retention (957.2 mAh g−1) at 0.2 A g−1 after 100 cycles (78.9% after 300 cycles). The method is effective and easy to operate. This work provides a novel idea for designing silicon–carbon composites.

中文翻译：

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由催化石墨包裹的 3D 类石墨烯纳米片/硅作为优异的锂存储阳极

摘要 硅碳复合材料兼具碳和硅材料的优点，被认为是最有前途的锂离子电池负极。在这项工作中，通过化学氧化-热膨胀策略和高温烧结方法制备了由催化石墨包裹的 3D 类石墨烯纳米片/硅的复合材料（G-3DGNs-Si）。有序排列的 3DGN 中明显的相互关联的 3D 层状空间可以均匀地容纳硅纳米粒子 (SiNP)。3DGNs 可以缓解体积膨胀并提高 SiNPs 的导电性。此外，催化石墨均匀涂覆在 3DGNs-Si 上可以进一步提高电化学性能。G-3DGNs-Si 复合负极在 0.2 A g-1 下 100 次循环后可实现 90% 的可逆容量保持率（957.2 mAh g-1）（300 次循环后为 78.9%）。该方法有效且易于操作。这项工作为设计硅碳复合材料提供了一个新的思路。