Supercritical CO2-Assisted SiOx/Carbon Multi-Layer Coating on Si Anode for Lithium-Ion Batteries

Rahmandhika Firdauzha Hary Hernandha, Purna Chandra Rath, Bharath Umesh, Jagabandhu Patra, Chih Yang Huang, Wen Wei Wu, Quan Feng Dong, Ju Li, Jeng Kuei Chang

研究成果: Article同行評審

67 引文 斯高帕斯(Scopus)

摘要

Supercritical CO2 (SCCO2), characterized by gas-like diffusivity, low surface tension, and excellent mass transfer properties, is applied to create a SiOx/carbon multi-layer coating on Si particles. Interaction of SCCO2 with Si produces a continuous SiOx layer, which can buffer Si volume change during lithiation/delithiation. In addition, a conformal carbon film is deposited around the Si@SiOx core. Compared to the carbon film produced via a conventional wet-chemical method, the SCCO2-deposited carbon has significantly fewer oxygen-containing functional groups and thus higher electronic conductivity. Three types of carbon precursors, namely, glucose, sucrose, and citric acid, in the SCCO2 syntheses are compared. An eco-friendly, cost-effective, and scalable SCCO2 process is thus developed for the single-step production of a unique Si@SiOx@C anode for Li-ion batteries. The sample prepared using the glucose precursor shows the highest tap density, the lowest charge transfer resistance, and the best Li+ transport kinetics among the electrodes, resulting in a high specific capacity of 918 mAh g−1 at 5 A g−1. After 300 charge–discharge cycles, the electrode retains its integrity and the accumulation of the solid electrolyte interphase is low. The great potential of the proposed SCCO2 synthesis and composite anode for Li-ion battery applications is demonstrated.

原文English
文章編號2104135
期刊Advanced Functional Materials
31
發行號40
DOIs
出版狀態Published - 2021 10月 1

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 一般化學
  • 凝聚態物理學
  • 一般材料科學
  • 電化學
  • 生物材料

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