Robust Micron-Sized Silicon Secondary Particles Anchored by Polyimide as High-Capacity, High-Stability Li-Ion Battery Anode

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

6 Scopus Citations
View graph of relations

Detail(s)

Original languageEnglish
Pages (from-to)34132−34139
Journal / PublicationACS Applied Materials and Interfaces
Volume10
Issue number40
Online published14 Sep 2018
Publication statusPublished - 10 Oct 2018

Abstract

Silicon is an attractive high-capacity anode material for lithium-ion battery. With the help of nanostructures, cycling performance of silicon anode has improved significantly in the past couple of years. However, three major shortcomings associated with nanostructures still need to be addressed, namely, their high surface area, low tap density, and poor scalability. Herein, we present a facile and practical method to produce micron-sized Si secondary particle cluster (SiSPC) with a high tap density and a low surface area from bulk Si by high-energy ball-milling. By coupling SiSPC with a mechanically robust polyimide binder, more than 95% of the initial capacity is retained after 500 cycles at 3500 mA g-1 (1C rate). Reversibility of electrode thickness change is confirmed by in situ dilatometry. In addition, the polyimide binder suppresses the surface reaction of the particles with electrolyte, resulting in a high Coulombic efficiency of 99.7%. Excellent cycling performance is obtained even for thick electrodes with an areal capacity of 3.57 mAh cm-2, similar to those in commercial lithium-ion batteries. The presented Si electrode system has a high volumetric capacity of 598 mAh cm-3, which is higher than that of the commercial graphite anode materials.

Research Area(s)

  • high-energy ball-mill, lithium-ion battery, mechanical stability, polyimide, secondary silicon particle

Citation Format(s)

Robust Micron-Sized Silicon Secondary Particles Anchored by Polyimide as High-Capacity, High-Stability Li-Ion Battery Anode. / Lee, Pui-Kit; Tan, Tian; Wang, Shuo; Kang, Wenpei; Lee, Chun-Sing; Yu, Denis Y. W.

In: ACS Applied Materials and Interfaces, Vol. 10, No. 40, 10.10.2018, p. 34132−34139.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal