Mass production of SiO x @C anode material in gas-solid fluidized bed

doi:10.19799/j.cnki.2095-4239.2022.0175

Abstract

Abstract:

Based on gas-solid phase regulation, this work has achieved mass production of high-performance silicon oxide carbon (SiO _x @C) anode materials for lithium-ion batteries using fluidized bed chemical vapor deposition (FB-CVD) technology. Ordinarily, for micron-sized silicon oxide carbon powder, significant interparticle van der Waals forces impede fluidization through severe agglomeration and island-like deposition on the surface. This behavior adversely affects the resulting electrochemical performance. To address this, first, particle phase pressure was introduced to construct the particle-like van der Waals state equation. Next, based on stability analysis, the gas-solid phase regulation diagram was used to guide secondary particle design. This allowed attainment of full fluidization in the FB for CVD carbon coating. Agglomeration was suppressed by virtue of stable fluidization. Additionally, high-efficiency mass- and heat-transfer ensured a change from island growth to near-layer growth for carbon deposition onto the surfaces of silicon oxide particles. As a result, uniform deposition of carbon onto silicon oxide was successfully accomplished. Through various electrochemical tests, characterization, and analyses, the as-prepared SiO _x @C anode material revealed outstanding cyclability and rate performance. This technology has achieved pilot production volumes at present, and it is expected to gain industrial scale-up to 100 tons in the near future.

Key words: gas-solid phase structure regulation, fluidized bed, chemical vapor deposition, stability analysis, secondary particle, SiO _x @C anode

CLC Number:

O 646.5

XIAO Zhexi, LU Feng, LIN Xianqing, ZHANG Chenxi, BAI Haolong, YU Chunhui, HE Ziying, JIANG Hairong, WEI Fei. Mass production of SiO _x @C anode material in gas-solid fluidized bed[J]. Energy Storage Science and Technology, 2022, 11(6): 1739-1748.

Figures/Tables 7

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