Semimicro-size agglomerate structured silicon-carbon composite as an anode material for high performance lithium-ion batteries

JOURNAL OF POWER SOURCES

卷:334

Article

Sohn, Hiesang¹  Kim, Dong Hyeon²  Yi, Ran¹  Tang, Duihai¹  Lee, Sang-Eui³  Jung, Yoon Seok²  Wang, Donghai¹ 

[1] Penn State Univ, Dept Mech & Nucl Engn, University Pk, PA 16802 USA

[2] Ulsan Natl Inst Sci & Technol, Sch Energy & Chem Engn, Dept Energy Engn, Ulsan 689798, South Korea

[3] Univ Calif Los Angeles, Mech & Aerosp Engn Dept, Los Angeles, CA 90095 USA

关键词: Semimicro-size silicon-carbon composite;    Agglomerate structure;    Aerosol process;    Lithium-ion battery anode;   

DOI  :  10.1016/j.jpowsour.2016.09.096

来源: Elsevier

【 摘 要 】

A semimicro-size agglomerate structured silicon-carbon (mSi-C) composite is constructed by an aggregation of silicon nanoparticles (similar to 100 nm) coated with conductive carbon layer through a facile and scalable aerosol-assisted process to be employed as an anode material for lithium-ion batteries (LIBs). As formed mSi-C composite delivers good electrochemical performances of high reversible capacity (2084 mAh/g) between 0.01 and 1.50 V (vs. Li/Li+) at 0.4 A/g, 96% capacity retention (1999 mAh/g) after 50 cycles and good rate capability (906 mAh/g) at 12 A/g. Such good performances can be attributed to 1) unique composite structure which accommodates the stress induced by volume change of silicon during lithiation/delithiation and facilitates ion transport, and 2) conformally formed carbon layer which enhances conductivity of the composite and helps to form a stable SEI layer. In addition, a high tap density (0.448 g/cm(3)) of mSi-C composite leads to high volumetric capacity (933 mAh/cm(3)), allowing its practical applications as an anode material towards high performance LIBs. (C) 2016 Published by Elsevier B.V.

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