Structural defects in LiMn2O4 induced by gamma radiation and its influence on the Jahn-Teller effect

Rodríguez, Renier Arabolla; Pérez-Cappe, Eduardo L.; Laffita, Yodalgis Mosqueda; Ardanza, Armando Chávez; Salazar, Jaime Santoyo; Santos, Manuel Ávila; Frutis, M. A. Aguilar; Mohalem, Nelcy Della Santina; Alves, Oswaldo Luiz

doi:10.1016/j.ssi.2018.06.007

Cited by 22 publications

(6 citation statements)

References 21 publications

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“…According to the existing literature, the electrochemical performance of LiMn 2 O 4 can be severely affected by the Jahn–Teller distortion effect and Mn dissolution during the process of discharging and charging due to the fact that the Jahn–Teller distortion and Mn dissolution is closely related to the trivalent state (Mn 3+ ), which can seriously affect the discharging process and the discharged state [13,14,15,16]. In recent years, many optimization strategies (doping, coating, morphology control, etc.)…”

Section: Introductionmentioning

confidence: 99%

Improved Electrochemical Properties of LiMn2O4-Based Cathode Material Co-Modified by Mg-Doping and Octahedral Morphology

Zhao

Nie

Que³

et al. 2019

Materials

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In this work, the spinel LiMn2O4 cathode material was prepared by high-temperature solid-phase method and further optimized by co-modification strategy based on the Mg-doping and octahedral morphology. The octahedral LiMn1.95Mg0.05O4 sample belongs to the spinel cubic structure with the space group of Fd3m, and no other impurities are presented in the XRD patterns. The octahedral LiMn1.95Mg0.05O4 particles show narrow size distribution with regular morphology. When used as cathode material, the obtained LiMn1.95Mg0.05O4 octahedra shows excellent electrochemical properties. This material can exhibit high capacity retention of 96.8% with 100th discharge capacity of 111.6 mAh g−1 at 1.0 C. Moreover, the rate performance and high-temperature cycling stability of LiMn2O4 are effectively improved by the co-modification strategy based on Mg-doping and octahedral morphology. These results are mostly given to the fact that the addition of magnesium ions can suppress the Jahn–Teller effect and the octahedral morphology contributes to the Mn dissolution, which can improve the structural stability of LiMn2O4.

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Section: Introductionmentioning

confidence: 99%

Improved Electrochemical Properties of LiMn2O4-Based Cathode Material Co-Modified by Mg-Doping and Octahedral Morphology

Zhao

Nie

Que³

et al. 2019

Materials

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“…Hence, the improved rate performance of Fe‐doped LMO may be attributed to the enhanced ionic and electronic conducting behaviors resulting from doping in the transition metal‐oxide structure. Moreover, the Fe‐doped LMO cathodes exhibited improved recovery after the rate performance tests, suppressing the Jahn‐Teller distortion effect and preventing Mn dissolution [40,59] . Specifically, LFMO‐0.3, with an appropriate Fe dopant, exhibited superior rate performance and recovery even after cycling at various current densities.…”

Section: Resultsmentioning

confidence: 98%

“…Moreover, the Fe-doped LMO cathodes exhibited improved recovery after the rate performance tests, suppressing the Jahn-Teller distortion effect and preventing Mn dissolution. [40,59] Specifically, LFMO-0.3, with an appropriate Fe dopant, exhibited superior rate performance and recovery even after cycling at various current densities. On the other hand, LFMO-0.4 with an excessive amount of oxygen vacancies showed the deteriorated cycling and rate performances.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Cycling Performance of Fe‐doped LiMn₂O₄ Truncated Octahedral Cathodes for Li‐Ion Batteries

et al. 2022

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LiMn 2 O 4 (LMO) with a spinel crystal structure is a promising cathode for next-generation Li-ion batteries (LIBs), owing to its low cost and high operating voltage of ~4.4 V. However, due to the Jahn-Teller distortion effect, LMO typically exhibits deteriorated cycling performance, owing to the dissolution of Mn into a liquid electrolyte. In this study, Fe-doped truncated octahedral LMO cathodes with different concentrations were synthesized to improve LMO stability in LIBs. The Fe-doped truncated octahedral LMO was characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The Li + ion diffusion coefficients of the cathodes were measured using electrochemical impedance spectroscopy and the galvanostatic intermittent titration technique. Compared to the truncated octahedral undoped LMO, the Fe-doped LMO cathode with an appropriate amount of dopant exhibited the best LIB performance, with the highest Li + ion diffusivity resulting from the increased oxygen vacancy as the path of Li + ion.

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“…LiMn 2 O 4 is one of the materials used as cathode lithium active material. LiMn 2 O 4 has a relatively inexpensive price and good thermal stability, but has a weakness on low specific capacities [1,2]. For this reason, various efforts have been made by scientists to increase their specific capacity, one of which is to convert it to Li 1+x Mn 2 O 4 .…”

Section: Introductionmentioning

confidence: 99%

FORMATION OF SPINEL STRUCTURE IN SYNTHESIS PROCESS OF Li1.37Mn2O4 USING HYDROTHERMAL METHOD

Purawiardi

Wigayati

2018

jsmi

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FORMATION OF SPINEL STRUCTURE IN SYNTHESIS PROCESS OF Li1.37Mn2O4 USING HYDROTHERMAL METHOD. Li1.37Mn2O4 is one form of Li1+xMn2O4 which is engineered from LiMn2O4 phase which is commonly used as a lithium cathode active ingredient. The crucial thing from Li1.37Mn2O4 synthesis is the spinel structure that is formed. This study aims to observe when the spinel structure of Li1.37Mn2O4 starts and when the transformation from a tetragonal structure into spinel occurs. The raw materials used are tetragonal LiOH and tetragonal MnO2. The synthesis was carried out using a hydrothermal method with a temperature of 200 oC with a variation of holding times of 50, 70, 90 and 110 hours. Observation of spinel structure was carried out using XRD and TEM. The results obtained were at the holding times of 50 and 70 hours, the spinel structure had not been formed. The spinel structure begins to form at 90 hours holding time which also indicates that the transformation from the tetragonal structure to spinel occurs at such holding time. The result of a 90-hour holding time is a regular spinel structure but there are still many Mn and Mn-O –based impurities. While the results of the 110-hour holding time produce a perfect yet irregular transformation of the spinel structure.

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Structural defects in LiMn2O4 induced by gamma radiation and its influence on the Jahn-Teller effect

Cited by 22 publications

References 21 publications

Improved Electrochemical Properties of LiMn2O4-Based Cathode Material Co-Modified by Mg-Doping and Octahedral Morphology

Improved Electrochemical Properties of LiMn2O4-Based Cathode Material Co-Modified by Mg-Doping and Octahedral Morphology

Enhanced Cycling Performance of Fe‐doped LiMn₂O₄ Truncated Octahedral Cathodes for Li‐Ion Batteries

FORMATION OF SPINEL STRUCTURE IN SYNTHESIS PROCESS OF Li1.37Mn2O4 USING HYDROTHERMAL METHOD

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Structural defects in LiMn2O4 induced by gamma radiation and its influence on the Jahn-Teller effect

Cited by 22 publications

References 21 publications

Improved Electrochemical Properties of LiMn2O4-Based Cathode Material Co-Modified by Mg-Doping and Octahedral Morphology

Improved Electrochemical Properties of LiMn2O4-Based Cathode Material Co-Modified by Mg-Doping and Octahedral Morphology

Enhanced Cycling Performance of Fe‐doped LiMn2O4 Truncated Octahedral Cathodes for Li‐Ion Batteries

FORMATION OF SPINEL STRUCTURE IN SYNTHESIS PROCESS OF Li1.37Mn2O4 USING HYDROTHERMAL METHOD

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Enhanced Cycling Performance of Fe‐doped LiMn₂O₄ Truncated Octahedral Cathodes for Li‐Ion Batteries