Abstract To notably improve the cycling stability of high-capacity SiO anode, an ingenious carbon dual coating structure was proposed, utilizing the high conductivity of 1D carbon (1D-C) and the excellent buffering of amorphous carbon (a-C). The carbon deposition pattern by regulating process temperatures was explored. An evolutive carbon deposition mechanism between 1D-C and a-C was deduced, which was a competitive mode between low-temperature catalytic growth and high-temperature pyrolysis deposition. Motivated by the deduced carbon deposition mechanism, a novel two-step coating process via fluidized bed chemical vapor deposition was proposed to fabricate the SiO/1D-C/a-C composite. The grown thickened 1D-C and deposited a-C were heterogeneously coated on the SiO particle surface, forming an ingenious dual coating structure. The synthesized SiO/1D-C/a-C exhibited extremely significant enhanced cycling stability, which showed a reversible capacity of 1012 mAh g−1 (capacity retention of 88.3%) after 120 cycles. The thickened 1D-C is entangled with each other to form a three-dimensional conductive network, while the deposited a-C formed a shell-like coating to buffer the volume expansion during cycling. The unique carbon dual coating structure achieved synergistic strengthening, which guarantees the superior electrochemical performance of the SiO/1D-C/a-C.

中文翻译：

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通过流化床化学气相沉积原位制备双涂层结构的 SiO/1D-C/aC 复合材料作为高性能锂离子电池负极

摘要 为了显着提高高容量SiO负极的循环稳定性，利用一维碳（1D-C）的高电导率和无定形碳（aC）的优异缓冲性，提出了一种巧妙的碳双涂层结构。通过调节工艺温度探索了碳沉积模式。推导出1D-C和aC之间演化的碳沉积机制，这是低温催化生长和高温热解沉积之间的竞争模式。受推导的碳沉积机制的启发，提出了一种通过流化床化学气相沉积的新型两步涂覆工艺来制造 SiO/1D-C/aC 复合材料。生长增厚的 1D-C 和沉积的 aC 异质涂覆在 SiO2 颗粒表面，形成巧妙的双涂层结构。合成的 SiO/1D-C/aC 表现出极其显着增强的循环稳定性，在 120 次循环后显示出 1012 mAh g-1 的可逆容量（容量保持率为 88.3%）。增厚的1D-C相互缠绕形成三维导电网络，而沉积的aC形成壳状涂层以缓冲循环过程中的体积膨胀。独特的碳双涂层结构实现了协同强化，保证了SiO/1D-C/aC优异的电化学性能。而沉积的活性炭形成壳状涂层以缓冲循环过程中的体积膨胀。独特的碳双涂层结构实现了协同强化，保证了SiO/1D-C/aC优异的电化学性能。而沉积的活性炭形成壳状涂层以缓冲循环过程中的体积膨胀。独特的碳双涂层结构实现了协同强化，保证了SiO/1D-C/aC优异的电化学性能。