Improvement in the cycling performance of LiMn2O4 by the substitution of Fe for Mn

Song, Myoung Youp; Ahn, Deuk Soo

doi:10.1016/s0167-2738(98)00233-1

Cited by 41 publications

(16 citation statements)

References 5 publications

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“…To improve the electrochemical properties of LiNiO 2 , Co [20][21][22][23][24], Al [25][26][27][28], Ti [29][30][31][32], Ga [33], Mn [34] and Fe [35][36][37][38][39] ions were substituted for nickel ions by synthesis in oxygen. Reimers et al [35] studied solid solution series of LiFe y Ni 1-y O 2 (0.1 B y B 0.5).…”

Section: Introductionmentioning

confidence: 99%

Electrochemical properties of Li1−z (Ni1−y Fe y )1+z O2 synthesized by the combustion method in an air atmosphere

Song

Kwon

Song³

et al. 2008

J Appl Electrochem

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For the syntheses of LiNi 1-y Fe y O 2 (0.000 B y B 0.300), mixtures of the starting materials with the desired compositions were preheated in an air atmosphere at 400°C for 30 min and calcined in air at 700°C for 48 h. The phases appearing in the intermediate reaction steps for the formation of lithium nickel oxide are deduced from the DTA analysis. XRD analysis, FE-SEM observation, FTIR analysis and electrochemical measurement were performed for the synthesized Li 1-z (Ni 1-y Fe y ) 1?z O 2 (0.000 B y B 0.300) samples. The samples of Li 1-z (Ni 1-y Fe y ) 1?z O 2 with y = 0.025 and 0.050 have higher first discharge capacities than Li 1-z (Ni 1-y Fe y ) 1?z O 2 with y = 0.000 and better or similar cycling performance at the 0.1 C rate in the voltage range of 2.7-4.2 V. Similar results have not previously been reported except for Co-substituted LiNiO 2 . The sample Li 1-z (Ni 0.975 Fe 0.025 ) 1?z O 2 has the highest first discharge capacity (176.5 mAh g -1 ). Rietveld refinement of the XRD patterns of LiNi 1-y Fe y O 2 (0.000 \ y B 0.100) from a starting structure model [Li,Ni] 3b [Li,Ni,Fe] 3a [O 2 ] 6c showed that cation disordering occurred in the samples.

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Section: Introductionmentioning

confidence: 99%

Electrochemical properties of Li1−z (Ni1−y Fe y )1+z O2 synthesized by the combustion method in an air atmosphere

Song

Kwon

Song³

et al. 2008

J Appl Electrochem

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“…The doping elements are metals: either non-transition, e.g. Al, Mg [14][15][16][17][18][19], or transition metals Ni [20][21][22][23][24][25][26][27][28][29][30][31], Fe [14,[32][33][34][35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Formation of Fe and Ni substituted LiMn_2–XM_XO₄nanopowders and their crystal and electronic structure and magnetic properties

Talik

Lipińska

Guzik

et al. 2017

Materials Science-Poland

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The Pechini sol-gel method was applied to obtain LiMn 2 − x T x O 4 (T = Ni, Fe; x = 0.1 to 0.5) nanopowders. Crystal and electronic structures, chemical composition and magnetic properties of the materials were characterized by X-ray diffraction, XPS, SEM/EDX microscopy, prompt gamma-ray activation analysis (PGAA), Mössbauer spectroscopy and magnetic susceptibility, respectively. XRD measurements showed that the LiMn 2 − x Ni x O 4 were single phase for x = 0.1 and 0.2. Three samples with higher Ni content contained some addition of a second phase. Analysis of the oxidation state of the dopants by XPS revealed ionic Ni 2+ and Fe 3+ . Mössbauer spectroscopy also confirmed 3+ oxidation state of iron and its location in octahedral sites, which excluded the inverse spinel configuration. XPS examinations showed that Mn 3+ ions dominated in the iron substituted series whereas the Mn 4+ was dominant in the nickel series.

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“…Transition metal oxides such as LiMn 2 O 4 [1][2][3], LiCoO 2 [4][5][6], and LiNiO 2 [7][8][9][10] have been intensively investigated in order to use them as the cathode materials of lithium secondary batteries. LiMn 2 O 4 is comparatively inexpensive and does not bring about any environmental pollution, but its cycling performance is not adequate.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical properties of LiNi1−y M y O2 (M=Ni, Ga, Al and/or Ti) cathodes synthesized by the combustion method

et al. 2008

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LiNiO 2 , LiNi 0.995 Al 0.005 O 2 , LiNi 0.975 Ga 0.025 O 2 , LiNi 0.990 Ti 0.010 O 2 and LiNi 0.990 Al 0.005 Ti 0.005 O 2 were synthesized by preheating at 400°C for 30 min in air and calcination at 750°C for 36 h in an O 2 stream with excess lithium amount z = 0.10 in Li 1?z Ni 1-y M y O 2 . For these samples, the discharge capacities and discharge capacity degradation rate are compared. LiNiO 2 has the largest discharge capacity at the 20th cycle (n = 20) and the 50th cycle (n = 50). LiNiO 2 and LiNi 0.995 Al 0.005 O 2 have relatively good cycling performances and their discharge capacities at n = 50 are 134 and 123 mAh/g, respectively, at 0.1 C rate. The crystallite sizes and strains were calculated by the Williamson-Hall method with XRD patterns and compared for the samples as prepared and after 50 charge-discharge cycles.

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Improvement in the cycling performance of LiMn2O4 by the substitution of Fe for Mn

Cited by 41 publications

References 5 publications

Electrochemical properties of Li1−z (Ni1−y Fe y )1+z O2 synthesized by the combustion method in an air atmosphere

Electrochemical properties of Li1−z (Ni1−y Fe y )1+z O2 synthesized by the combustion method in an air atmosphere

Formation of Fe and Ni substituted LiMn_2–XM_XO₄nanopowders and their crystal and electronic structure and magnetic properties

Electrochemical properties of LiNi1−y M y O2 (M=Ni, Ga, Al and/or Ti) cathodes synthesized by the combustion method

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Improvement in the cycling performance of LiMn2O4 by the substitution of Fe for Mn

Cited by 41 publications

References 5 publications

Electrochemical properties of Li1−z (Ni1−y Fe y )1+z O2 synthesized by the combustion method in an air atmosphere

Electrochemical properties of Li1−z (Ni1−y Fe y )1+z O2 synthesized by the combustion method in an air atmosphere

Formation of Fe and Ni substituted LiMn2–XMXO4nanopowders and their crystal and electronic structure and magnetic properties

Electrochemical properties of LiNi1−y M y O2 (M=Ni, Ga, Al and/or Ti) cathodes synthesized by the combustion method

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Formation of Fe and Ni substituted LiMn_2–XM_XO₄nanopowders and their crystal and electronic structure and magnetic properties