Volume 9, Issue 2 2000899
Full Paper

Sulfur-Implanted Carbon Dots-Embedded Graphene as Ultrastable Anode for Li-Ion Batteries

Ramesh Gottam

Ramesh Gottam

Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002 China

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Xiangxin Zhang

Xiangxin Zhang

Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002 China

Dalian National Laboratory for Clean Energy, Chinese Academy of Sciences, Dalian, 161000 China

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Jiang Chen

Jiang Chen

University of Chinese Academy of Sciences, Beijing, 100049 China

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Xilai Xue

Xilai Xue

Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002 China

University of Chinese Academy of Sciences, Beijing, 100049 China

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Yining Zhang

Corresponding Author

Yining Zhang

Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002 China

Dalian National Laboratory for Clean Energy, Chinese Academy of Sciences, Dalian, 161000 China

University of Chinese Academy of Sciences, Beijing, 100049 China

Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, Fujian, 350108 P. R. China

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First published: 23 December 2020
Citations: 3

Abstract

Sulfur doping in carbonaceous materials is an effective approach to improve the performance of Li-ion batteries (LIBs). Herein, sulfur-implanted carbon dots-embedded graphene (S-CDs/rGO) as an anode material for LIBs is reported. A facile method is used to prepare S-CDs/rGO by annealing the mixture of benzyl disulfide (BDS) and graphene oxide (GO). Herein, BDS serves as both the sulfur source and precursor of CDs. S-CDs/rGO as an anode material for LIB delivers initial specific capacities of 938.8 mAh g−1 (first cycle) and 598.6 mAh g−1 (second cycle) at a current density of 100 mA g−1. S-CDs/rGO exhibits superior cycling performance with good capacity retentions of 78.8% (500 cycles), 61.5% (2000 cycles), and 75.7% (2000 cycles) at higher current densities of 1000, 2000, and 3000 mA g−1, respectively. Moreover, the full cell assembly of the prepared S-CDs/rGO as an anode and commercial LiFePO4 as a cathode in the voltage range of 1.5–3.9 V delivers a high reversible capacity of 203.3 mAh g−1 after extensive 1000 cycles at 500 mA g−1 with 51.8% retention (a low fading rate of 0.049% per cycle), rendering it as a promising anode material for application in high-performance LIBs.

Conflict of Interest

The authors declare no conflict of interest.

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