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Nano Research

Article Title

Flower-like NiCo2S4 nanosheets with high electrochemical performance for sodium-ion batteries

Authors

Yongqiang Miao, Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), Jilin Key Engineering Laboratory of New Energy Materials and Technologies, College of Physics, Jilin University, Changchun 130012, China
Xiaosen Zhao, Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), Jilin Key Engineering Laboratory of New Energy Materials and Technologies, College of Physics, Jilin University, Changchun 130012, China
Xin Wang, Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), Jilin Key Engineering Laboratory of New Energy Materials and Technologies, College of Physics, Jilin University, Changchun 130012, China
Chenhui Ma, Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), Jilin Key Engineering Laboratory of New Energy Materials and Technologies, College of Physics, Jilin University, Changchun 130012, China
Lu Cheng, Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), Jilin Key Engineering Laboratory of New Energy Materials and Technologies, College of Physics, Jilin University, Changchun 130012, China
Gang Chen, Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), Jilin Key Engineering Laboratory of New Energy Materials and Technologies, College of Physics, Jilin University, Changchun 130012, China
Huijuan Yue, State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, China
Lei Wang, Key Laboratory of Eco-Chemical Engineering (Ministry of Education), College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
Dong Zhang, Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), Jilin Key Engineering Laboratory of New Energy Materials and Technologies, College of Physics, Jilin University, Changchun 130012, China

Keywords

NiCo2S4, sodium-ion batteries, anode materials, sodium storage mechanism, pseudocapacitance

Abstract

A three-dimensional flower-like NiCo2S4 formed by two-dimensional nanosheets is synthesized by a facile hydrothermal method and utilized as the anode for sodium-ion batteries. Studies have shown that materials can achieve the best performance under the ether-based electrolyte system with voltage ranging from 0.3 to 3 V, which could effectively avoid the dissolution of polysulfides and over-discharge of the material. Here, sodium storage mechanism and charge compensation behaviors of this ternary metal sulfide are comprehensively investigated by ex situ X-ray diffraction. Moreover, ex situ Raman spectra, ex situ X-ray photoelectron spectroscopy and transmission electron microscopy measurements are used to related tests for the first time. Additionally, quantitative kinetic analysis unravels that sodium storage partially depends on the pseudocapacitance mechanism, resulting in good specific capacity and excellent rate performance. The initial discharge capacity is as high as 748 mAh·g−1 at a current density of 0.1 A·g−1 with the initial coulomb efficiency of 94%, and the capacity can still maintain at 580 mAh·g−1 with the Coulomb efficiency close to 100% after following 50 cycles. Moreover, by the long cycle test at a high current density of 2 A·g−1, the capacity can still reach at 376 mAh·g−1 after over 500 cycles.

Graphical Abstract

Publisher

Tsinghua University Press

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