Volume 132, Issue 7 pp. 2676-2680
Zuschrift

An Organic–Inorganic Hybrid Cathode Based on S–Se Dynamic Covalent Bonds

Jiawei Zhao

Jiawei Zhao

College of Chemistry, Zhengzhou University, Zhengzhou, 450001 P. R. China

These authors contributed equally to this work.

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Dr. Yubing Si

Dr. Yubing Si

College of Chemistry, Zhengzhou University, Zhengzhou, 450001 P. R. China

These authors contributed equally to this work.

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Zixiao Han

Zixiao Han

College of Chemistry, Zhengzhou University, Zhengzhou, 450001 P. R. China

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Dr. Junjie Li

Dr. Junjie Li

Research Technologies, Indiana University, Indianapolis, IN, 46202 USA

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Prof. Wei Guo

Prof. Wei Guo

College of Chemistry, Zhengzhou University, Zhengzhou, 450001 P. R. China

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Prof. Yongzhu Fu

Corresponding Author

Prof. Yongzhu Fu

College of Chemistry, Zhengzhou University, Zhengzhou, 450001 P. R. China

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First published: 21 November 2019
Citations: 6

Abstract

A diphenyl trisulfide–selenium nanowire (DPTS-Se) organic–inorganic hybrid cathode material is presented for rechargeable lithium batteries. During discharge, three voltage plateaus associated with three lithiation processes are observed. During recharge, the combination of the radicals formed upon delithiation leads to several new phenyl sulfoselenide compounds which are confirmed by HPLC-QTof-MS. The hybrid cathode exhibits superior cycling stability over pristine Se or DPTS as cathode alone. The first discharge shows a capacity of 96.5 % of the theoretical specific capacity and the cell retains 69.2 % of the initial capacity over 250 cycles. The hybrid cathode also shows a high Coulombic efficiency of over 99 % after 250 cycles. This study demonstrates that the combination of organic polysulfide and selenium can not only improve the utilization of active materials but also enhance the cycling performance.

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