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5 years ago

Adjusting the Chemical Bonding of SnO2@CNT Composite for Enhanced Conversion Reaction Kinetics

Adjusting the Chemical Bonding of SnO2@CNT Composite for Enhanced Conversion Reaction Kinetics
Jiayin Li, Qiao Xi, Hui Qi, Xiaomin Luo, Jianfeng Huang, Jun Yang, Kazumichi Yanagisawa, Yayi Cheng, Liyun Cao
Carbon nanotubes (CNTs) with excellent electron conductivity are widely used to improve the electrochemical performance of the SnO2 anode. However, the chemical bonding between SnO2 and CNTs is not clearly elucidated despite it may affect the lithiation/delithiation behavior greatly. In this work, an SnO2@CNT composite with SnC and SnOC bonds as a linkage bridge is reported and the influence of the SnC and SnOC bonds on the lithium storage properties is revealed. It is found that the SnC bond can act as an ultrafast electron transfer path, facilitating the reversible conversion reaction between Sn and Li2O to form SnO2. Therefore, the SnO2@CNT composite with more SnC bond shows high reversible capacity and nearly half capacity contributes from conversion reaction. It is opposite for the SnO2@CNT composite with more SnOC bond that the electrons cannot be transferred directly to CNTs, resulting in depressed conversion reaction kinetics. Consequently, this work can provide new insight for exploration and design of metal oxide/carbon composite anode materials in lithium-ion battery. SnC bonds provide a more direct e− transfer path than SnOC bonds, resulting in enhanced conversion reaction kinetics that Sn and Li2O can reverse back to SnO2. Different content of SnC and SnOC bonds is controlled in the synthesis of a SnO2@CNT composite. It is found that the SnO2@CNTs with more SnC bond display a highly reversible conversion reaction. Since the SnC bond can provide an ultrafast electron transfer path during lithiation/delithiation, the reversible conversion reaction between Sn and Li2O to form SnO2 is facilitated.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/smll.201700656

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