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The advance of nickel-cobalt-sulfide as ultra-fast/high sodium storage materials: The influences of morphology structure, phase evolution and interface property

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成果类型:
期刊论文
作者:
SijieLi;PengGe;FengJiang;HongleiShuai;WeiXu;YunlingJiang;YangZhang;JiugangHu;HongshuaiHou;XiaoboJi
作者机构:
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China
State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
语种:
英文
关键词:
NiCo2S4;N-doped carbon;Electrolyte;Cut-off voltage;Sodium-ion batteries
期刊:
Energy Storage Materials
ISSN:
2405-8297
年:
2019
卷:
16
页码:
267-280
机构署名:
本校为第一机构
院系归属:
化学化工学院
粉末冶金研究院
资源加工与生物工程学院
摘要:
Numerous interests have been captured for bimetallic NiCo2S4 ascribed to its excellent electrical conductivity, whilst its sluggish sodium-ion kinetics at high-rate limits the advancement of reversible sodium storage. Herein, NiCo2S4 nanodots (~ 9 nm) uniformly incorporated with N-doped carbon are prepared (NiCo2S4@NC) through bottom-up strategy from 0D to stable structure. Considering that the suitable ether-based electrolyte (NaCF3SO3/DEGDME) may well promote faster sodium-ion transportation due to flexible one-dimensional chain structure and favorable solvent-salt interaction, and the optimal voltage region (0.4–3.0 V) could effectively successfully sidestep the side reaction and maintain reversible phase transformation. Such multi-factors tuned NiCo2S4@NC offers remarkable electrochemical performance as anode for SIBs. It delivers a stable capacity of 570.1 mAh g−1 after 200 cycles at 0.2 A g−1, and still retains 395.6 mAh g−1 at 6.0 A g−1 after 5,000 loops. Significantly, the mechanism and dynamics explorations by cyclic voltammetry (CV) profoundly reveal the dominant surface-capacitive behaviors of NiCo2S4@NC. A suite of in-situ electrochemical impedance spectroscopy (EIS) analyses further explore the regular dual-interface resistances of NiCo2S4@NC during the sodiation/desodiation process, corresponding to the reversible phase evolution and stable carbon matrix. This systematic study establishes a firm foundation for the later research of TMDs as excellent energy-storage anode materials for SIBs.

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