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SJTU Prof. Chen Jiesheng Team Made Important Progress in Organic Anode materials for Na-ion Batteries

June 06, 2018      Author: Ma Chao

The team led by Prof. Chen Jiesheng and Wang Kaixue research group from School of Chemistry and Chemical Engineering, SJTU, together with the team led by Prof. Liu Jianjun from Shanghai Institute of Ceramics, Chinese Academy of Sciences, has made important progress in research on non-conjugated carboxylate compounds as anode materials for Na-ion batteries. Their work offered a new idea for developing new high-capacity and highly-reversible anode materials for Na-ion batteries and also provided a new strategy for determining redox reactive centers of organic electrode materials.

This research result has recently been published on the Angew. Chem. Int. Ed. with the title “Non-Conjugated Dicarboxylate Anode Materials for Electrochemical Cells”. Its first authors include Ma Chao, a SJTU doctoral student, and Zhao Xiaolin, a master student from the Shanghai Institute of Ceramics, and researcher Wang Kaixue is the corresponding author. This research was supported by the National Natural Science Foundation of China (51432010, 51472158, 21573272, 21720102002) and the Foundation for Open Projects in State Key Lab of High Performance Ceramics and Superfine Microstructure (SKL201703SIC).

 

Classical organic anode materials for Na-ion batteries are mostly based on conjugated carboxylate compounds which can stabilize added electrons by double-bond reformation mechanism. However, the variation of such organic compounds is quite limited. Based on experiment and computation results, we here report 1,4- Cyclohexanedicarboxylic acid (C8H12O4, CHDA) with non-conjugated ring (-C6H10-) connected with carboxylates can undergo electrochemical reactions with two Na ions, delivering a high charge specific capacity of 284 mA h g-1 (249 mA h g-1 after 100 cycles), and good rate performance. First-principles calculations indicate that hydrogen-transfer-mediated orbital conversion from anti-bonding π* to bonding σ stabilize two added electrons, and reactive intermediate with unpaired electron is suppressed by localization of σ-bonds and steric hindrance. A noteworthy advantage of CHDA as anode material is good reversibility and relative constant voltage. A large variety of organic non-conjugated compounds are predicted to be promising anode materials for Na-ion batteries. The work sheds new light on the development of novel organic anode materials for Na-ion batteries.

 

Translated by Chen Qianqian   Reviewd by Wang Bingyu