Electrochemical studies of substituted spinel LiAlyMn2−yO4−zFz for lithium secondary batteries

Wang, Xiaomei; Zong, Xu; Yang, Qian; Zhong-Kao, Jin; Wu, Hui

doi:10.1016/s0022-1139(00)00344-4

Cited by 19 publications

(5 citation statements)

References 20 publications

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“…Previous communications had shown the crucial impact of the spinel surface and interface with the liquid electrolyte on the resulting electrochemical performance. LiAl x Mn 2Àx O 4Àz F z exhibited lower resistance to charge transfer during room temperature cycling [45]. In addition, minimization of the interface with electrolyte was demonstrated to benefit elevated temperature storage and room temperature cycling, by lowering the catalytic effects of the spinel towards electrolyte oxidation and manganese dissolution [46].…”

Section: Fluorine-doped Intercalation Materialsmentioning

confidence: 99%

Fluoride based electrode materials for advanced energy storage devices

Amatucci

Pereira

2007

Journal of Fluorine Chemistry

396

280

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Section: Fluorine-doped Intercalation Materialsmentioning

confidence: 99%

Fluoride based electrode materials for advanced energy storage devices

Amatucci

Pereira

2007

Journal of Fluorine Chemistry

396

280

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“…[7][8][9][10] To improve the electrochemical performance of Li 4 Ti 5 O 12 , Al 3ϩ was chosen as an alternative dopant for its extreme stability in an octahedral environment and for its light weight. 11 In this paper, we report the results obtained for Li 4 Al y Ti 5Ϫy O 12 with various Al 3ϩ doping contents. The materials have been characterized by X-ray diffraction ͑XRD͒ and scanning electron microscopy ͑SEM͒ observations.…”

mentioning

confidence: 99%

Preparation and Electrochemical Performance of Spinel-Type Compounds Li[sub 4]Al[sub y]Ti[sub 5−y]O[sub 12] (y=0, 0.10, 0.15, 0.25)

Huang

Zhang

Zhu

et al. 2005

J. Electrochem. Soc.

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Ti 5Ϫy O 12 (y ϭ 0.10, 0.15, 0.25͒ were synthesized via solid-state reaction using TiO 2 -rutile, Li 2 CO 3 , and Al 2 O 3 as starting reagents. The charge-discharge cycling of the cells showed that the electrochemical performance of Li 4 Ti 5 O 12 prepared from rutile-type TiO 2 by our laboratory was as good as that produced by anatase-type TiO 2 . However, Al 3ϩ doped Li 4 Al y Ti 5Ϫy O 12 (y ϭ 0.10, 0.15) exhibited a much better electrochemical performance in comparison with undoped Li 4 Ti 5 O 12 . Among the three samples of Li 4 Al y Ti 5Ϫy O 12 (y ϭ 0, 0.10, 0.15), Li 4 Al 0.15 Ti 4.85 O 12 exhibited the largest reversible capacity and the highest coulombic efficiency. The discharge capacity values in the first and second cyclings were 195.6 and 173.6 mAh/g, respectively. The value remained 166.9 mAh/g after 30 cycles with a capacity loss of 3.86% compared to the second cycle, and the coulombic efficiency was 99.2% at the 30th cycle.Electrodes containing Li 4 Ti 5 O 12 have good Li-ion intercalation and deintercalation reversibility and exhibit no structural change ͑zero-strain insertion material͒ during charge-discharge cycling. This active material has a main discharge platform close to 1.55 V vs. Li ϩ /Li, which is very promising for use in electrodes in numerous battery applications. 1 So far, the spinel-type Li 4 Ti 5 O 12 has mainly been prepared by a solid-state reaction from TiO 2 and Li 2 CO 3 or LiOH. The reaction typically occurs within 12-24 h at 800-1000°C. [2][3][4] Titanium dioxide adopts eight different crystallographic structures. Relevant data on Li ϩ insertion exist only for anatase and rutile. Anatase is generally considered to be the most active Li ϩ insertion host; the insertion into rutile-type TiO 2 (r-TiO 2 ) is usually reported to be negligible. Thus, anatase-type TiO 2 (a-TiO 2 ) has been used in most studies as the starting material for Li 4 Ti 5 O 12 . 5 Because r-TiO 2 is a natural material, it has low cost and wide source, and a-TiO 2 changes to r-TiO 2 at high temperatures. In this paper, we use r-TiO 2 as the starting material and study its performance.Although Li 4 Ti 5 O 12 is an insulator, doping the structure with small amounts of Mg 2ϩ has been reported to improve the electronic conductivity of the spinel by many orders of magnitude. 6 Other doping ions such as Cr 3ϩ , V 3ϩ , Mn 2ϩ , Ba 2ϩ , and Sr 2ϩ have also been studied to improve the capacity and cycling property, but no satisfactory results have been obtained. 7-10 To improve the electrochemical performance of Li 4 Ti 5 O 12 , Al 3ϩ was chosen as an alternative dopant for its extreme stability in an octahedral environment and for its light weight. 11 In this paper, we report the results obtained for Li 4 Al y Ti 5Ϫy O 12 with various Al 3ϩ doping contents. The materials have been characterized by X-ray diffraction ͑XRD͒ and scanning electron microscopy ͑SEM͒ observations. The electrochemical cycling performance of Li 4 Al y Ti 5Ϫy O 12 (y ϭ 0, 0.10, 0.15, 0.25) in lithium cells was also studied. ExperimentalSample...

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“…In addition, the water in the crystal lattice is further removed, reducing the hydrogen bond attraction in the crystal lattice. These factors together lead to the crystal cell tends to increase 32 …”

Section: Resultsmentioning

confidence: 99%

“…These factors together lead to the crystal cell tends to increase. 32 Figure 2B shows the cycle performance curves of LiMn 2 O 4 prepared at different calcination temperatures. At the calcination temperatures of 730 C, 780 C, and 830 C, the initial discharge specific capacities of LiMn 2 O 4 were 109, 115, and 105.5 mAh g À1 , respectively.…”

Section: Calcination Temperaturesmentioning

confidence: 99%

Preparation and electrochemical properties of Al‐F co‐doped spinel LiMn ₂ O ₄ single‐crystal material for lithium‐ion battery

Luo

Wang

et al. 2021

Intl J of Energy Research

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Summary Spinel LiMn2O4 has the advantages of high voltage, high safety, low pollution, low cost, and rich resources. However, its low initial capacity, rapid‐cycle decay, and other factors hinder its commercialization process. In this paper, a pure phase LiMn2O4 is synthesized by a high‐temperature solid‐phase method, and the element doping is used to modify it to improve its cycle performance. The results show that the optimal process conditions for preparing LiMn2O4 are: the Li/Mn ratio is 1.05:2, the calcination temperature is 780°C, and the calcination time is 15 hours. X‐ray diffractometer reveals that the samples prepared by Al3+ and F− co‐doping are still typical spinel structures. Scanning electron microscope shows that the sample is single‐crystal Li1.05Al0.02Mn1.98F0.02O3.98 with uniform grain distribution and regular morphology. The sample has excellent cycle performance, and its initial discharge specific capacity is 115.5 mAh g−1 at 0.1C. The capacity retention rate is still above 80% after 367 cycles, and the specific capacity is 90.3 mAh g−1. The Al‐F co‐doped LiMn2O4 single‐crystal material can effectively inhibit the Jahn‐Teller effect, alleviate the dissolution of Mn, as well as increase the diffusion channel of Li+. This work provides a theoretical basis for promoting the development of LiMn2O4 cathode materials for lithium‐ion batteries.

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Electrochemical studies of substituted spinel LiAlyMn2−yO4−zFz for lithium secondary batteries

Cited by 19 publications

References 20 publications

Fluoride based electrode materials for advanced energy storage devices

Fluoride based electrode materials for advanced energy storage devices

Preparation and Electrochemical Performance of Spinel-Type Compounds Li[sub 4]Al[sub y]Ti[sub 5−y]O[sub 12] (y=0, 0.10, 0.15, 0.25)

Preparation and electrochemical properties of Al‐F co‐doped spinel LiMn ₂ O ₄ single‐crystal material for lithium‐ion battery

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Electrochemical studies of substituted spinel LiAlyMn2−yO4−zFz for lithium secondary batteries

Cited by 19 publications

References 20 publications

Fluoride based electrode materials for advanced energy storage devices

Fluoride based electrode materials for advanced energy storage devices

Preparation and Electrochemical Performance of Spinel-Type Compounds Li[sub 4]Al[sub y]Ti[sub 5−y]O[sub 12] (y=0, 0.10, 0.15, 0.25)

Preparation and electrochemical properties of Al‐F co‐doped spinel LiMn 2 O 4 single‐crystal material for lithium‐ion battery

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Preparation and electrochemical properties of Al‐F co‐doped spinel LiMn ₂ O ₄ single‐crystal material for lithium‐ion battery