Micro-sized porous silicon@PEDOT with high rate capacity and stability for Li-ion battery anode

• Published in: Materials letters Vol. 293; p. 129712
• Main Authors: Li, Shuangfu, Huang, Jinhua, Wang, Jue, Han, Kai
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.06.2021; Elsevier BV
• Subjects: Anode effect; Anodic coatings; Anodic protection; Composite materials; Conducting polymers; Conductive polymer; Energy storage and conversion; Flux density; Lithium; Lithium-ion batteries; Low conductivity; Materials science; Porous material; Porous silicon; Protective structures; Rechargeable batteries; Si anode; Synergistic effect; Conductive polymer; Composite materials; Si anode; Porous material; Energy storage and conversion
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2021.129712

[Display omitted] •Micro-sized porous Si@PEDOT composite anode was synthesized.•NaOH etching of AlSi powder is prefer to HCl to maintain the micro morphology.•Si@PEDOT exhibited a high rate capacity of 1168 mAh g−1 at 2000 mA g−1. To address the serious volume expansion and poor conductivity of silicon anode in lithium ion batteries (LIBs), a strategy through coating conductive polymer on the surface of micro-Si via a facile wet chemical process is proposed. In this way, a porous micro-Si anode coated with poly (3, 4-ethylenedioxythiophene) (PEDOT) was synthesized. This material shows a capacity as high as 1168 mAh g−1 at high current rate of 2000 mA g−1 for anode of LIBs. The synergistic effect of porous structure and PEDOT protective layer could not only relieve the volume expansion, but also enhance the conductivity of Si. This study provides an attractive strategy to deal with volume expansion and low conductivity of Si, which could be very meaningful for the development of high energy density LIBs.