Effect of silicon configurations on the mechanical integrity of silicon-carbon nanotube heterostructured anode for lithium ion battery: A computational study

JOURNAL OF POWER SOURCES

卷:304

Article

Damle, Sameer S.¹  Pal, Siladitya²  Kumta, Prashant N.^1,3,4,5  Maiti, Spandan^1,3,4,6 

[1] Univ Pittsburgh, Dept Chem Engn, Pittsburgh, PA 15261 USA

[2] Indian Inst Technol Roorkee, Mech & Ind Engn Dept, Roorkee 247667, Uttrakhand, India

[3] Univ Pittsburgh, Dept Bioengn, Pittsburgh, PA 15261 USA

[4] Univ Pittsburgh, Ctr Complex Engn Multifunct Mat, Pittsburgh, PA 15261 USA

[5] Univ Pittsburgh, Dept Mech Engn & Mat Sci, Pittsburgh, PA 15261 USA

[6] 207 CNBIO,300 Technol Dr, Pittsburgh, PA 15219 USA

关键词: Li-ion battery;    Silicon;    Si-CNT heterostructured anode;    Plastic deformation;    Void nucleation and growth;    Mechanical integrity;   

DOI  :  10.1016/j.jpowsour.2015.11.027

来源: Elsevier

【 摘 要 】

Heterostructures of silicon and carbon nanotubes (CNT) have been widely studied as Li-ion battery anodes. The focus of the current study is to investigate the role of silicon configurations on the mechanical integrity of the Si-CNT heterostructured anodes during electrochemical cycling. We hypothesize that void nucleation and growth in silicon during electrochemical cycling of Li can induce fracture and eventual failure. To test this hypothesis, we utilized a custom developed multiphysics finite element modeling framework considering the lithium diffusion induced elasto-plastic deformation of silicon. We systematically varied the silicon component configuration and enumerated the stress field within it for one complete electrochemical cycle. Resulting evolution of stress state reveals that reducing the mechanical constraints on Si reduces the plastic flow of the material, and thus possibility of void nucleation and growth. We find that the Si droplet configuration is mechanically stable while the continuous Si coating configuration is prone to void growth induced mechanical failure. Present analysis provides a mechanistic understanding of the effect of Si configurations in heterostructured electrodes on its mechanical integrity, which can help in design of next-generation hetersostructured electrodes with improved capacity retention. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

Free