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Polymer‐Derived and Sodium Hydroxide‐Treated Silicon Carbonitride Material as Anodes for High Electrochemical Performance Li–ion Batteries
Author(s) -
Feng Yan,
Wei Yuzhen,
Jia Zhe,
Zhang Yuliang,
Battaglia Vincent,
Liu Gao
Publication year - 2016
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201600046
Subject(s) - materials science , electrochemistry , anode , silicon , sodium hydroxide , lithium (medication) , hydroxide , chemical engineering , aqueous solution , polymer , sodium ion battery , extraction (chemistry) , composite material , electrode , chemistry , metallurgy , faraday efficiency , organic chemistry , medicine , engineering , endocrinology
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 Si 3 N 4 phase elimination from SiCN matrix by NaOH treatment, and lithium ion transfer channel enrichment by the formation of micro‐cracks.