Polymer‐Derived and Sodium Hydroxide‐Treated Silicon Carbonitride Material as Anodes for High Electrochemical Performance Li–ion Batteries

Publisher: John Wiley & Sons Inc

E-ISSN: 2365-6549|1|2|309-317

ISSN: 2365-6549

Source: ChemistrySelect, Vol.1, Iss.2, 2016-02, pp. : 309-317

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Abstract

Polymer‐derived and micro‐cracked silicon carbonitride (SiCN) materials have been successfully synthesized via pyrolyzing from poly(diphenylcarbondiimide) and post‐treating with different molar concentration of sodium hydroxide (NaOH) aqueous solution (0.2‐5.0 mol L−1). The as‐prepared SiCN materials have been used as anodes for lithium ion batteries. Electrochemical charge‐discharge measurements indicate that the SiCN with the 0.5 mol L−1 of NaOH treating (SiCN‐0.5‐NaOH) shows the best electrochemical performance. It exhibits a high initial specific extraction capacity of 1159.5 mAh g−1 and stable capacity of 900 mAh g−1 at current density of 40 mA g−1. The morphology and structure measurements show its surface is rough, and many micro‐sized cracks are formed. The special performances of NaOH‐treated SiCN anodes are attributed to non‐conductive Si3N4 phase elimination from SiCN matrix by NaOH treatment, and lithium ion transfer channel enrichment by the formation of micro‐cracks.

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