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Nano Research

Article Title

Construction and electrochemical mechanism investigation of hierarchical core-shell like composite as high performance anode for potassium ion batteries

Authors

Nadeem Hussain, Key Laboratory of Colloid & Interface Chemistry, Ministry of Education and School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, China;; International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology (Ministry of Education), Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen, 518060, China;
Suyuan Zeng, Shandong Provincial Key Laboratory/Collaborative Innovation Center of Chemical Energy Storage & Novel Cell Technology, Liaocheng University, Liaocheng, 252059, China;
Zhenyu Feng, Key Laboratory of Colloid & Interface Chemistry, Ministry of Education and School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, China;
Yanjun Zhai, Shandong Provincial Key Laboratory/Collaborative Innovation Center of Chemical Energy Storage & Novel Cell Technology, Liaocheng University, Liaocheng, 252059, China;
Chunsheng Wang, Key Laboratory of Colloid & Interface Chemistry, Ministry of Education and School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, China;
Mingwen Zhao, School of Physics, Shandong University, Jinan, 250100, China;
Yitai Qian, Key Laboratory of Colloid & Interface Chemistry, Ministry of Education and School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, China;
Liqiang Xu, Key Laboratory of Colloid & Interface Chemistry, Ministry of Education and School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, China;; Shandong Provincial Key Laboratory/Collaborative Innovation Center of Chemical Energy Storage & Novel Cell Technology, Liaocheng University, Liaocheng, 252059, China;

Keywords

core-shell, pseudocapacitance, first principle calculations, potassium-ion batteries

Abstract

Potassium-ion batteries (PIBs) are promising candidates for next-generation energy storage devices due to the earth abundance of potassium, low cost, and stable redox potentials. However, the lack of promising high-performance electrode materials for the intercalation/deintercalation of large potassium ions is a major challenge up to date. Herein, we report a novel uniform nickel selenide nanoparticles encapsulated in nitrogen-doped carbon (defined as pNiSe@NCq) as an anode for PIBs, which exhibits superior rate performance and cyclic stability. Benefiting from the unique hierarchical core-shell like nanostructure, the intrinsic properties of metal-selenium bonds, synergetic effect of different components, and a remarkable pseudocapacitance effect, the anode exhibits a very high reversible capacity of 438 mAdhdg-1 at 50 mAdg-1, an excellent rate capability, and remarkable cycling performance over 2, 000 cycles. The electrochemical mechanism were investigated by the in-situ X-ray diffraction, ex-situ high-resolution transmission electron microscopy, selected area electron diffraction, and first principle calculations. In addition, NiSe@NC anode also shows high reversible capacity of 512 mAdhdg-1 at 100 mAdg-1 with 84% initial Coulombic efficiency, remarkable rate performance, and excellent cycling life for sodium ion batteries. We believe the proposed simple approach will pave a new way to synthesize suitable anode materials for secondary ion batteries.

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