Large-Scale Production of a Silicon Nanowire/Graphite Composites Anode via the CVD Method for High-Performance Lithium-Ion Batteries,Energy & Fuels

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Large-Scale Production of a Silicon Nanowire/Graphite Composites Anode via the CVD Method for High-Performance Lithium-Ion Batteries
Energy & Fuels ( IF 5.2 ) Pub Date : 2021-01-22 , DOI: 10.1021/acs.energyfuels.0c03725
Bei Liu ₁ , Peng Huang ₁ , Zhiyong Xie ₁ , Qizhong Huang ₁

Affiliation

Aiming at preparing a cheap and high-performance anode material, a novel carbon-coated silicon nanowire on a surface of graphite microsphere composites was fabricated by employing a new silicon precursor via the chemical vapor deposition method. The chemical vapor deposition method could further reduce the cost and realize the large-scale preparation of silicon/graphite composites and simultaneously enhance the bonding strength between silicon and graphite. Due to the lower cost and lower requirement on equipment compared with silane, chloromethylsilane was selected to produce pure silicon as the content of carrier gas is 25 vol %. Deposited with silicon and carbon for 15 and 30 min, respectively, the carbon/silicon nanowire/graphite microsphere composites display outstanding electrochemical performance with a specific capacity of 580 mA h g^–1 at a current density of 0.2 C after 100 cycles and high-rate performance of 300 mA h g^–1 at 5 C. Besides, the adsorption and deposition mechanisms of silicon on a graphite surface are expounded. This new preparation process is an alternative route for promoting the practical application of silicon/graphite composites.

中文翻译：

通过CVD方法大规模生产高性能锂离子电池硅纳米线/石墨复合材料阳极

为了制备廉价且高性能的阳极材料，通过化学气相沉积法采用新型硅前驱体，在石墨微球复合材料表面制备了一种新型的碳包覆硅纳米线。化学气相沉积法可以进一步降低成本，实现硅/石墨复合材料的大规模制备，同时可以提高硅与石墨的结合强度。由于与硅烷相比成本较低且对设备的要求较低，因此选择氯甲基硅烷生产纯硅，因为载气的含量为25 vol％。碳/硅纳米线/石墨微球复合材料分别沉积有15分钟和30分钟的硅和碳，显示出出色的电化学性能，比容量为580 mA hg^-1在100个循环和300毫安汞的高倍率性能后0.2C的电流密度^-1在5℃另外，硅的一个石墨表面吸附和沉积机制进行了阐述。这种新的制备方法是促进硅/石墨复合材料实际应用的替代途径。

更新日期：2021-02-04

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