A simple, low-cost and eco-friendly approach to synthesize single-crystalline LiMn2O4 nanorods with high electrochemical performance for lithium-ion batteries

Zhao, Hongyuan; Li, Fang; Liu, Xingquan; Xiong, Weiqiang; Chen, Bing; Shao, Huailing; Que, Dongyang; Zhang, Zheng; Wu, Yue

doi:10.1016/j.electacta.2015.03.040

Cited by 79 publications

(27 citation statements)

References 42 publications

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“…This is principally because the Er 3+ ions in the ErO 6 octahedra showed stronger bonding energy (615 kJ/mol) than that of the Mn 3+ ions in the MnO 6 octahedra (402 kJ/mol) [50]. In addition, it should be noted that the Er-doped LiMn 2 O 4 samples showed higher (311)/(400) peak intensity ratios, which have much to do with the cycling life of LiMn 2 O 4 [21,51]. An analysis of the previously published results indicated that the introduction of erbium ions may play a constructive role in enhancing the electrochemical properties.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Cycling Stability through Erbium Doping of LiMn2O4 Cathode Material Synthesized by Sol-Gel Technique

et al. 2018

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In this work, LiMn2−xErxO4 (x ≤ 0.05) samples were obtained by sol-gel processing with erbium nitrate as the erbium source. XRD measurements showed that the Er-doping had no substantial impact on the crystalline structure of the sample. The optimal LiMn1.97Er0.03O4 sample exhibited an intrinsic spinel structure and a narrow particle size distribution. The introduction of Er3+ ions reduced the content of Mn3+ ions, which seemed to efficiently suppress the Jahn–Teller distortion. Moreover, the decreased lattice parameters suggested that a more stable spinel structure was obtained, because the Er3+ ions in a ErO6 octahedra have stronger bonding energy (615 kJ/mol) than that of the Mn3+ ions in a MnO6 octahedra (402 kJ/mol). The present results suggest that the excellent cycling life of the optimal LiMn1.97Er0.03O4 sample is because of the inhibition of the Jahn-Teller distortion and the improvement of the structural stability. When cycled at 0.5 C, the optimal LiMn1.97Er0.03O4 sample exhibited a high initial capacity of 130.2 mAh g−1 with an excellent retention of 95.2% after 100 cycles. More significantly, this sample showed 83.1 mAh g−1 at 10 C, while the undoped sample showed a much lower capacity. Additionally, when cycled at 55 °C, a satisfactory retention of 91.4% could be achieved at 0.5 C after 100 cycles with a first reversible capacity of 130.1 mAh g−1.

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Section: Resultsmentioning

confidence: 99%

Enhanced Cycling Stability through Erbium Doping of LiMn2O4 Cathode Material Synthesized by Sol-Gel Technique

et al. 2018

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“…The poor cycling performance of LMO spinel can be ascribed to a reversible phase transition from cubic to orthorhombic near room temperature, derived from the Jahn–Teller distortion of Mn 3+ ions [12,13,14], as well as partial manganese dissolution from the spinel according to the disproportionation of Mn 3+ into Mn 2+ and Mn 4+ [15,16,17]. In order to surmount these obstacles, strategies including cation or anion doping [18,19,20], surface modification [21,22,23], and preparation of nanostructured spinels [24,25,26] were investigated. In our previous work, we revealed that sulphur substitution in the oxygen sublattice of lithium manganese oxide spinel can also be successfully implemented to promote its structural stability and electrochemical characteristic [27].…”

Section: Introductionmentioning

confidence: 99%

Nature of the Electrochemical Properties of Sulphur Substituted LiMn2O4 Spinel Cathode Material Studied by Electrochemical Impedance Spectroscopy

et al. 2016

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In this work, nanostructured LiMn2O4 (LMO) and LiMn2O3.99S0.01 (LMOS1) spinel cathode materials were comprehensively investigated in terms of electrochemical properties. For this purpose, electrochemical impedance spectroscopy (EIS) measurements as a function of state of charge (SOC) were conducted on a representative charge and discharge cycle. The changes in the electrochemical performance of the stoichiometric and sulphur-substituted lithium manganese oxide spinels were examined, and suggested explanations for the observed dependencies were given. A strong influence of sulphur introduction into the spinel structure on the chemical stability and electrochemical characteristic was observed. It was demonstrated that the significant improvement in coulombic efficiency and capacity retention of lithium cell with LMOS1 active material arises from a more stable solid electrolyte interphase (SEI) layer. Based on EIS studies, the Li ion diffusion coefficients in the cathodes were estimated, and the influence of sulphur on Li+ diffusivity in the spinel structure was established. The obtained results support the assumption that sulphur substitution is an effective way to promote chemical stability and the electrochemical performance of LiMn2O4 cathode material.

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“…The LiMnO 2 sample synthesized at 180 °C present stronger diffraction peak, corresponding to the better crystallinity. It is important to note that the excessive 6 hydrothermal temperature leads to the formation of the impurity phase Li 2 MnO 3 , which can be ascribed to the oxidation of LiMnO 2 by oxygen and the further lithium incorporation under excessive temperature [21]. Furthermore, it can be seen from Fig.…”

Section: Methodsmentioning

confidence: 97%

“…As a kind of cathode material, lithium manganese oxide has been attracting significant attention from academies and enterprises for the great advantages such as abundant manganese resources, lower cost and nontoxicity [4]. The Li-Mn-O compounds can present different stoichiometries, such as Li 2 MnO 3 , LiMnO 2 and LiMn 2 O 4 , etc [5,6].…”

Section: Introductionmentioning

confidence: 99%

A simple and facile one-step strategy to synthesize orthorhombic LiMnO2 nano-particles with excellent electrochemical performance

Zhao

Chen

Cheng

et al. 2015

Ceramics International

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A simple, low-cost and eco-friendly approach to synthesize single-crystalline LiMn2O4 nanorods with high electrochemical performance for lithium-ion batteries

Cited by 79 publications

References 42 publications

Enhanced Cycling Stability through Erbium Doping of LiMn2O4 Cathode Material Synthesized by Sol-Gel Technique

Enhanced Cycling Stability through Erbium Doping of LiMn2O4 Cathode Material Synthesized by Sol-Gel Technique

Nature of the Electrochemical Properties of Sulphur Substituted LiMn2O4 Spinel Cathode Material Studied by Electrochemical Impedance Spectroscopy

A simple and facile one-step strategy to synthesize orthorhombic LiMnO2 nano-particles with excellent electrochemical performance

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