Enhanced cycling stability of LiMn2O4 cathode by amorphous FePO4 coating

Qing, Chunbo; Bai, Ying; Yang, Jueming; Zhang, Weifeng

doi:10.1016/j.electacta.2011.04.131

Cited by 95 publications

(42 citation statements)

References 53 publications

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“…Among the surface modification studies, it has been found that the improved electrochemical behavior can be attributed to the suppression of the growth of SEI film and the partial suppression of stress caused by the volume change during cycling [20]. FePO 4 has been advanced to be a novel cathode candidate for LIBs because of its various advantages such as environmental friendliness, low cost and thermal stability [22,23]. As a modification material, FePO 4 has been coated on the surface of LiCoO 2 [22], Li x Ni 0.9 Co 0.1 O 2 [24] and LiMn 2 O 4 [25].…”

Section: Introductionmentioning

confidence: 99%

Improved cycling performance of 5 V spinel LiMn1.5Ni0.5O4 by amorphous FePO4 coating

Liu

Bai

Zhao

et al. 2012

Journal of Power Sources

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Section: Introductionmentioning

confidence: 99%

Improved cycling performance of 5 V spinel LiMn1.5Ni0.5O4 by amorphous FePO4 coating

Liu

Bai

Zhao

et al. 2012

Journal of Power Sources

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“…It is believed that thick coatings may hinder the transportation of lithium ions, leading to the evident decay of the specific capacity [9]. As a result, most concerns were focused on the tuning of the amount or the thickness of coating layers [10,11].…”

Section: Introductionmentioning

confidence: 99%

Nano-TiO2(B) coated LiMn2O4 as cathode materials for lithium-ion batteries at elevated temperatures

Shang

Lin

et al. 2015

Electrochimica Acta

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“…The procedure to determine the average manganese valence consisted in directly transferring [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] . In this case, the blank was a solution containing only NaCH 3 COO and 1,10-phenanthroline, obtained by adding 10 mL of aqueous 10% (m/m) NaCH 3 COO and 0.1% (m/m) 1,10-phenanthroline solutions to a 50 mL volumetric flask and completing its volume with deionized water.…”

Section: Methodsmentioning

confidence: 99%

“…7 This capacity loss is usually correlated with the (i) Jahn-Teller effect, which occurs mainly during charge-discharge at 3 V vs. Li/Li + , 3,8 (ii) manganese dissolution caused by the disproportionation reaction 2Mn 3+ (s) → Mn 4+ (s) + Mn 2+ (slv), 3,9 and (iii) instability of the spinel structure at the end of the charging process due to oxygen loss. 3 Different experimental strategies have been employed to minimize these possible problems: change of precursors and synthesis conditions, 10,11 change of size and morphology of the spinel particles, 12,13 coating of the spinel particles to prevent manganese dissolution, [14][15][16] trapping of the Mn cation, 17 and doping of the spinel Li x Mn 2 O 4 with different cations and anions. 3,7,18 This last strategy is one of the most employed and cited in the current literature.…”

Section: Introductionmentioning

confidence: 99%

A New, Friendlier Methodology to Determine the Average Manganese Valence in LixMn2O4 Spinels Using Atomic Absorption Spectrometry and Molecular Absorption Spectrophotometry

Silva¹,

Silva²,

Biaggio³

et al. 2017

J. Braz. Chem. Soc.

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An alternative, friendlier methodology for the determination of the average manganese valence (ν) of manganese oxides (mainly pure and doped spinels) is presented. This methodology is based on the facile determination of the concentration of Mn 2+ and Fe 2+ ions by atomic absorption spectrometry (AAS) and molecular absorption spectrophotometry (MAS), respectively. Prior to this determination, the manganese oxides are reacted with an acidic solution containing Fe 2+ ions, when all Mn ν+ ions are reduced to Mn 2+. Then, the concentration of Mn 2+ ions is obtained directly by AAS, whereas that of Fe 2+ ions is obtained by MAS after their complexation with o-phenanthroline. Using this methodology, the obtained mean (n = 3) ν values for the stoichiometric oxides Mn 2 O 3 and Mn 3 O 4 are 2.98 ± 0.01 and 2.66 ± 0.01, respectively; their precision is a clear evidence of the suitability of the here-proposed methodology. Additionally, a precise mean ν value (3.46 ± 0.01; n = 3) is also obtained for the spinel Li 1.05 Mn 2 O 4 , whereas a higher ν value (3.52 and 3.53; n = 2) is obtained for the doped spinel Li 1.05 Mn 1.98 Al 0.02 O 3.98 S 0.02 , evidencing that effective doping has been indeed attained. This novel methodology is easily applicable for Mn oxides in electrode materials of many energy storage devices. Keywords IntroductionIn the last decade, the popularization of portable electronic devices has increased, leading to a growing demand for lithium ion batteries (LIBs). In this scenario, some oxides have been targeted for studying and testing as cathode materials in LIBs; the spinel lithium manganese oxide (Li x Mn 2 O 4 ) is one of these oxides.1,2 The use of this spinel is favored by factors such as the manganese abundance, non-toxicity, and low cost, as well as the possibility of insertion of two lithium ions per formula unit.3 When 0 ≤ x ≤ 1, Li 3 Therefore, the average manganese valence of doped spinels is a useful parameter because it can provide information on their effective doping and structural changes.As far as we could ascertain, the most common approach to determine the average manganese valence of manganese oxides has been the Vetter and Jaeger's method, 33 employs an acid solution of potassium iodide to reduce all Mn ions in the manganese oxides to Mn 2+ ions. In this process, iodine is formed and quantified by titration with a sodium thiosulfate solution, while Mn 2+ ions are determined by titration with an EDTA solution. Titration of iodine was also proposed by Licci et al. 34 to determine the average manganese valence in Mn-La complexes. Firstly, after the Mn-La complex is dissolved in dilute H 2 SO 4 , the Mn ions are oxidized to permanganate ions by adding an excess of solid bismuthate, followed by the addition of an iodide solution (also in excess) that converts all permanganate ions into Mn 2+ ions, yielding iodine. In a parallel step, the Mn-La complex is reacted directly with an iodide solution, also yielding iodine. In both cases, the iodine is amperometrically titrated with a thio...

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Enhanced cycling stability of LiMn2O4 cathode by amorphous FePO4 coating

Cited by 95 publications

References 53 publications

Improved cycling performance of 5 V spinel LiMn1.5Ni0.5O4 by amorphous FePO4 coating

Improved cycling performance of 5 V spinel LiMn1.5Ni0.5O4 by amorphous FePO4 coating

Nano-TiO2(B) coated LiMn2O4 as cathode materials for lithium-ion batteries at elevated temperatures

A New, Friendlier Methodology to Determine the Average Manganese Valence in LixMn2O4 Spinels Using Atomic Absorption Spectrometry and Molecular Absorption Spectrophotometry

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