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Li E, Wang M, Hu X, Huang S, Yang Z, Chen J, Yu B, Guo B, Ma Z, Huang Y, Cao G, Li X. NH 4 + Pre-Intercalation and Mo Doping VS 2 to Regulate Nanostructure and Electronic Properties for High Efficiency Sodium Storage. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2308630. [PMID: 38100208 DOI: 10.1002/smll.202308630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Revised: 11/24/2023] [Indexed: 05/30/2024]
Abstract
Sodium-ion hybrid capacitors (SIHCs) have attracted much attention due to integrating the high energy density of battery and high out power of supercapacitors. However, rapid Na+ diffusion kinetics in cathode is counterbalanced with sluggish anode, hindering the further advancement and commercialization of SIHCs. Here, aiming at conversion-type metal sulfide anode, taking typical VS2 as an example, a comprehensive regulation of nanostructure and electronic properties through NH4 + pre-intercalation and Mo-doping VS2 (Mo-NVS2) is reported. It is demonstrated that NH4 + pre-intercalation can enlarge the interplanar spacing and Mo-doping can induce interlayer defects and sulfur vacancies that are favorable to construct new ion transport channels, thus resulting in significantly enhanced Na+ diffusion kinetics and pseudocapacitance. Density functional theory calculations further reveal that the introduction of NH4 + and Mo-doping enhances the electronic conductivity, lowers the diffusion energy barrier of Na+, and produces stronger d-p hybridization to promote conversion kinetics of Na+ intercalation intermediates. Consequently, Mo-NVS2 delivers a record-high reversible capacity of 453 mAh g-1 at 3 A g-1 and an ultra-stable cycle life of over 20 000 cycles. The assembled SIHCs achieve impressive energy density/power density of 98 Wh kg-1/11.84 kW kg-1, ultralong cycling life of over 15000 cycles, and very low self-discharge rate (0.84 mV h-1).
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Affiliation(s)
- Enzhi Li
- School of New Energy and Materials, Southwest Petroleum University, Chengdu, Sichuan, 610500, P. R. China
| | - Mingshan Wang
- School of New Energy and Materials, Southwest Petroleum University, Chengdu, Sichuan, 610500, P. R. China
| | - Xi Hu
- School of New Energy and Materials, Southwest Petroleum University, Chengdu, Sichuan, 610500, P. R. China
| | - Siming Huang
- School of New Energy and Materials, Southwest Petroleum University, Chengdu, Sichuan, 610500, P. R. China
| | - Zhenliang Yang
- Institute of Materials, China Academy of Engineering Physics, Mianyang, Sichuan, 621908, P. R. China
| | - Junchen Chen
- School of New Energy and Materials, Southwest Petroleum University, Chengdu, Sichuan, 610500, P. R. China
| | - Bo Yu
- School of New Energy and Materials, Southwest Petroleum University, Chengdu, Sichuan, 610500, P. R. China
| | - Bingshu Guo
- School of New Energy and Materials, Southwest Petroleum University, Chengdu, Sichuan, 610500, P. R. China
| | - Zhiyuan Ma
- School of New Energy and Materials, Southwest Petroleum University, Chengdu, Sichuan, 610500, P. R. China
| | - Yun Huang
- School of New Energy and Materials, Southwest Petroleum University, Chengdu, Sichuan, 610500, P. R. China
| | - Guozhong Cao
- Department of Materials Science and Engineering, University of Washington, Seattle, WA, 98195, USA
| | - Xing Li
- School of New Energy and Materials, Southwest Petroleum University, Chengdu, Sichuan, 610500, P. R. China
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Comparative study of electrochemical properties of SnS and SnS2 as anode materials in lithium-ion batteries. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.141725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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