What is it about?
High-performance of Si anode was synthesized in this work by adopting a PVP/PAN polymer blend followed by a facile and economical slow heat treatment process. This process created a uniformly distributed Si nanoparticles coated with both a SiO2 and carbon layer. Different characteristics of samples with and without PVP eludicated interesting mechanism of the formation of the coatings on Si. The self-assembled PVP shell around the Si allowed for an amplified oxidation of Si producing a robust SiO2 shell while the decomposition of PAN introduced a nitrogen-rich carbon coating over the SiO2.
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Why is it important?
When combined with a conductive graphene network, PVP with PAN binder was able to deliver excellent cycle stability with a cycle retention of 60 % over 600 cycles at a higher current density of 3 A g-1 as well as good rate capability.
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This page is a summary of: Tailoring the chemistry of blend copolymers boosting the electrochemical performance of Si-based anodes for lithium ion batteries, Journal of Materials Chemistry A, January 2017, Royal Society of Chemistry, DOI: 10.1039/c7ta08369f.
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