Si has been regarded as a hopeful advanced anode of lithium-ion batteries due to its features such as ultrahigh theoretical specific capacity and high natural abundance. But, it suffers from electrochemical irreversibility because of large volumetric change and poor conductivity during cycle. In spite of obtaining enhanced lithium storage performance after compositing with carbon materials, most of the reported Si/C composite anodes lack a simple preparation process. For the new anode materials, the simple preparation process is as important as showing high performance. Herein, an efficient simple method is developed to prepare a composite of N-doped carbon embedding Si nanoparticles (Si@C) to response to the above Si faced challenges. Its preparation process just consists of very simple ball milling and pyrolysis carbonization, showing great simplicity. The findings confirm that the combination of the ball-milling mixing and the use of PVP carbon precursor enables the optimal Si@C-2 composite to have a N-doped carbon embedding structure and a robust interface Si-O-C chemical bond bonding, hence obtaining enhanced conductivity, high electrochemical kinetics and superb structure stability during cycling process. Therefore, the Si@C-2 anode exhibits excellent performance, with 1542 and 794.7 mA h g−1 after 100 and 1000 cycles at 100 and 1000 mA g−1, respectively, superior to many reported Si/C composites. The simple, scalable preparation method and superb performances offer Si@C-2 great promising in advanced LIB anode applications.

中文翻译：

---

简单的球磨辅助方法，可实现用于高性能锂离子电池负极的 N 掺杂碳嵌入硅


Si 因其超高的理论比容量和高自然丰度等特点，一直被认为是一种有前途的锂离子电池先进负极。但是，由于循环过程中体积变化大和导电性差，它受到电化学不可逆性的影响。尽管在与碳材料合成后获得了增强的储锂性能，但大多数报道的 Si/C 复合负极缺乏简单的制备过程。对于新型负极材料，简单的制备过程与表现出高性能同样重要。在此，开发了一种高效简单的方法来制备 N 掺杂碳嵌入 Si 纳米颗粒 （Si@C） 的复合材料，以应对上述 Si 面临的挑战。它的制备过程只是由非常简单的球磨和热解碳化组成，表现出极大的简单性。研究结果证实，球磨混合与 PVP 碳前驱体的使用相结合，使最佳的 Si@C-2 复合材料具有 N 掺杂碳嵌入结构和坚固的界面 Si-O-C 化学键合，从而在循环过程中获得增强的导电性、高电化学动力学和卓越的结构稳定性。因此，Si@C-2 负极表现出优异的性能，在 100 和 1000 mA g-1 下循环 100 次和 1000 次循环后，分别达到 1542 和 794.7 mA h g-1，优于许多已报道的 Si/C 复合材料。简单、可扩展的制备方法和卓越的性能为高级 LIB 负极应用提供了 Si@C-2 的巨大前景。