کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
819337 906553 2012 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Silicon nanowire reinforced by single-walled carbon nanotube and its applications to anti-pulverization electrode in lithium ion battery
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی (عمومی)
پیش نمایش صفحه اول مقاله
Silicon nanowire reinforced by single-walled carbon nanotube and its applications to anti-pulverization electrode in lithium ion battery
چکیده انگلیسی

Lithium (Li) ion batteries are in high demand by most of portable electronic devices. Silicon (Si), owing to its large theoretical energy density (4200 mA h g−1), is a promising candidate for anode material. However, loss of electrical contact caused by the pulverization that comes from the enormous volume changes during charging and discharging process hinders its application. The aim of the current work is to elucidate the possibility of using carbon nanotubes (CNTs) for the Si reinforcement to minimize the volume expansions. Firstly, ab initio simulations demonstrate that the Li ions can permeate CNT through the tube end freely under the normal charge voltage (∼3.6 V). Then, molecular dynamics simulations are adopted to analyze the strength improvement of silicon nanowires (SiNWs) encapsulated by CNT. The compression simulations of SiNW were performed to reveal the expansion processes during Li ion insertion into the electrode. The results show that the smaller the SiNW is, the better the reinforcing effect is. A phase transition appears in the SiNW encapsulated by CNT during compression, which makes SiNW more ductile. The simulation results provide an effective way for the SiNW reinforcement in the Li ion battery.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Composites Part B: Engineering - Volume 43, Issue 1, January 2012, Pages 76–82
نویسندگان
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