Issue 46, 2017

Tailoring the chemistry of blend copolymers boosting the electrochemical performance of Si-based anodes for lithium ion batteries

Abstract

Flexible and conductive carbon networks have been widely employed to overcome the stability degradation of highly sought-after Si-based anodes for Li-ion batteries (LIBs). However, little attention has been paid to the contact intimacy of such a network. In this contribution, we designed a polymer blend of polyvinylpyrrolidone (PVP) and polyacrylonitrile (PAN) which was self-assembled onto the surface of silicon nanoparticles (SiNPs) allowing for the generation of a very intimate coating of a silicon dioxide and nitrogen-rich carbon shell upon sluggish heat treatment. This methodology capitalizes on the surface interaction of PVP with SiNPs to provide a sturdy nanoarchitecture. The addition of PVP improves the stability and adhesion of PAN to the carbon-based matrix which surrounds the silicon particles leading to enhanced stability. In addition to being a very scalable fabrication process, our novel blend of PVP and PAN allowed for an electrode with high reversibility. When compared with a standard electrode Si/PVDF framework, this material demonstrated a significantly superior 1st discharge capacity of 2736 mA h g−1, high coulombic efficiency, and excellent cycling stability for 600 cycles at a high rate of 3 A g−1.

Graphical abstract: Tailoring the chemistry of blend copolymers boosting the electrochemical performance of Si-based anodes for lithium ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
21 sep. 2017
Accepted
26 oct. 2017
First published
26 oct. 2017

J. Mater. Chem. A, 2017,5, 24159-24167

Tailoring the chemistry of blend copolymers boosting the electrochemical performance of Si-based anodes for lithium ion batteries

Elhadi N. Attia, F. M. Hassan, M. Li, R. Batmaz, A. Elkamel and Z. Chen, J. Mater. Chem. A, 2017, 5, 24159 DOI: 10.1039/C7TA08369F

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