Effect of Na-substitution on the electrode properties of LiMn2O4

Sun, Feilong; Xu, Yanhui

doi:10.1016/j.jallcom.2013.09.114

Cited by 14 publications

(6 citation statements)

References 35 publications

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“…The mole ratio of 0.03 in Li 1−x Na x MnPO 4 was found to be the maximum level of doping that enhances cycling properties [31]. Beyond this the addition of Na (>0.03) deteriorates the capacitive nature due to structural instability and weak electrochemical performance [30,32]. Li 0.97 Na 0.03 MnPO 4 demonstrated the maximum cycling stability compared with other samples with moderate doping of Na.…”

Section: Resultsmentioning

confidence: 89%

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Na-doped LiMnPO4 as an electrode material for enhanced lithium ion batteries

et al. 2017

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We report the influence of sodium (Na)-incorporated lithium manganese phosphate as an active material on its performance in electrochemical study for energy storage application. Li 1−x Na x MnPO 4 with different mole ratios (0.00 ≤ x ≤ 0.05) of sodium is synthesized via a simple sol-gel method. The discharge capacity of Li 1−x Na x MnPO 4 varies with respect to mole ratios of sodium incorporated. The maximum discharge capacity of 92.45 mAh g −1 is observed in Li 0.97 Na 0.03 MnPO 4 , which is higher than that of pristine LiMnPO 4 and other Na-incorporated LiMnPO 4. The maximum cyclic stability is found to be 84.15% up to 60 cycles. These results demonstrate that Li 0.97 Na 0.03 MnPO 4 plays a significant role in future energy storage application.

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Section: Resultsmentioning

confidence: 89%

“…Here, Na substitution made Mn-Mn distance longer as Na + ions are larger compared with Li + ions. This weakens the Jahn Teller effect and also yields strong cycling stability [30].…”

Section: Resultsmentioning

confidence: 99%

Na-doped LiMnPO4 as an electrode material for enhanced lithium ion batteries

et al. 2017

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“…As known to us, the radius of Na + (0.098 nm) is greater than that of Li + (0.076 nm) and the radius of Mg 2+ (0.072 nm) is greater than that of Mn 3+ (0.064 nm) and Mn 4+ (0.054 nm), so the successful doping of Na + , Mg 2+ naturally led to changes in the lattice parameters. A large number of studies , have revealed that the increase in the cell volume can effectively expand the diffusion path of Li + , thereby reducing the diffusion resistance and increasing the diffusion rate of Li + . Therefore, double-cation doping should be an effective and promising method in improving the diffusion rate of Li + and the electrochemical performances of the material.…”

Section: Results and Discussionmentioning

confidence: 99%

LiMn₂O₄ Cathode Materials with Excellent Performances by Synergistic Enhancement of Double-Cation (Na⁺, Mg²⁺) Doping and 3DG Coating for Power Lithium-Ion Batteries

Liu

Chen

et al. 2020

J. Phys. Chem. C

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LiMn2O4 is a very important cathode material in the field of plug-in hybrids. However, it has limited large-scale practical application because of its severe electrode polarization and rapid capacity decay. By means of synergistic enhancement of double-cation (Na+, Mg2+) doping and three-dimensional graphene (3DG) coating, the Li0.94Na0.06Mg0.08Mn1.92O4/3DG composite cathode material was successfully synthesized via hydrothermal synthesis, high-temperature solid-phase sintering, and freeze-drying. Electrochemical test results display that the initial discharge specific capacity of the Li0.94Na0.06Mg0.08Mn1.92O4/3DG material reaches 146 mAh/g (137 mAh/g for LiMn2O4) at 0.5C, and the specific capacity remains at 130 mAh/g after 100 cycles (99 mAh/g for LiMn2O4). At 10C, the initial discharge specific capacity of the Li0.94Na0.06Mg0.08Mn1.92O4/3DG material is 90 mAh/g (69 mAh/g for Li0.94Na0.06Mg0.08Mn1.92O4 and 38 mAh/g for LiMn2O4), which should be resulted from the synergistic enhancement of double-cation (Na+, Mg2+) doping and 3DG coating. Na+, Mg2+ codoping effectively expands the Li+ diffusion path and the diffusion coefficient of Li0.94Na0.06Mg0.08Mn1.92O4/3DG, and inhibits the dissolution of Mn3+. 3DG coating effectively improves the conductivity and reduces electrode polarization during the charge and discharge course. In addition, 3DG coating also plays an important role in inhibiting the dissolution of Mn3+.

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“…High temperature solid-state, sol-gel, solution combustion, co-precipitation and so on methods are proposed to prepare this material. Controlling its structure and micromorphology, 11,12 doping other elements and coating other matters 13,14 are used to enhance its cycle performance.…”

Section: Introductionmentioning

confidence: 99%

Significant Improvement of LiMn<sub>2</sub>O<sub>4</sub> Cathode Capacity by Introducing Trace Ni During Rapid Microwave-induced Solution Combustion

Chen

Wen

et al. 2020

Electrochemistry

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HRTEM image and cycle curves at 5C and 20C of LiMn 1.975 Ni 0.025 O 4 sampleLiMn 2 O 4 cathodes are prepared by a rapid microwave-induced solution combustion method. Their initial discharge capacity is significantly improved by introducing trace Ni. For example, the LiMn 1.975 Ni 0.025 O 4 (LMNO-0.025) cathode releases an initial discharge capacity of 134.1 mAh g −1 at 1 C, even 144.5 mAh g −1 at 0.5 C, which is far higher than of the pristine LiMn 2 O 4 cathode (119.7 mAh g −1 at 1 C) and close to its theoretical capacity of 148.2 mAh g −1 . After 1000 cycles, the capacity retention of the LMNO-0.025 sample reaches 56.53% at 1 C, and it can be presented the higher capacity retentions of 66.79% at 5 C and 66.89% at 20 C. The robust structure stability proved by XRD, SEM and HRTEM data, and the good kinetics testified by CV and EIS data of the Ni-doped material are responsible to improve the high-rate capability and long cycle properties.

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Effect of Na-substitution on the electrode properties of LiMn2O4

Cited by 14 publications

References 35 publications

Na-doped LiMnPO4 as an electrode material for enhanced lithium ion batteries

Na-doped LiMnPO4 as an electrode material for enhanced lithium ion batteries

LiMn₂O₄ Cathode Materials with Excellent Performances by Synergistic Enhancement of Double-Cation (Na⁺, Mg²⁺) Doping and 3DG Coating for Power Lithium-Ion Batteries

Significant Improvement of LiMn<sub>2</sub>O<sub>4</sub> Cathode Capacity by Introducing Trace Ni During Rapid Microwave-induced Solution Combustion

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Effect of Na-substitution on the electrode properties of LiMn2O4

Cited by 14 publications

References 35 publications

Na-doped LiMnPO4 as an electrode material for enhanced lithium ion batteries

Na-doped LiMnPO4 as an electrode material for enhanced lithium ion batteries

LiMn2O4 Cathode Materials with Excellent Performances by Synergistic Enhancement of Double-Cation (Na+, Mg2+) Doping and 3DG Coating for Power Lithium-Ion Batteries

Significant Improvement of LiMn<sub>2</sub>O<sub>4</sub> Cathode Capacity by Introducing Trace Ni During Rapid Microwave-induced Solution Combustion

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LiMn₂O₄ Cathode Materials with Excellent Performances by Synergistic Enhancement of Double-Cation (Na⁺, Mg²⁺) Doping and 3DG Coating for Power Lithium-Ion Batteries