Enhanced electrochemical performance of La- and Zn-co-doped LiMn2O4 spinel as the cathode material for lithium-ion batteries

Iqbal, Azhar; Iqbal, Yaseen; Chang, Lin; Ahmed, Safeer; Tang, Zhiyong; Gao, Yan

doi:10.1007/s11051-012-1206-9

Cited by 30 publications

(12 citation statements)

References 40 publications

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“…This demonstrates the importance of developing electrochemical cells for operando studies using laboratory X-rays, where it is easier to conduct slow charge/discharge experiments. The charge/discharge profile of the Li/LiMn 2 O 4 cell shows a typical three-region behavior as also observed in other studies using coin cells 31,32 confirming that the as-designed electrochemical cell provides reliable electrochemical data. Rietveld refinement results (see the supplementary material 23 ) show that the unit cell dimension is reduced from 8.23787(3) Å to 8.05838(2) Å upon complete removal of Li, resulting in a ∼2.18% contraction of the unit cell volume at the end of the first charge.…”

Section: A Limn 2 Osupporting

confidence: 85%

An electrochemical cell for in operando studies of lithium/sodium batteries using a conventional x-ray powder diffractometer

Shen

Pedersen

Christensen

et al. 2014

Review of Scientific Instruments

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An electrochemical cell has been designed for powder X-ray diffraction studies of lithium ion batteries (LIB) and sodium ion batteries (SIB) in operando with high time resolution using a conventional powder X-ray diffractometer. The cell allows for studies of both anode and cathode electrode materials in reflection mode. The cell design closely mimics that of standard battery testing coin cells and allows obtaining powder X-ray diffraction patterns under representative electrochemical conditions. In addition, the cell uses graphite as the X-ray window instead of beryllium, and it is easy to operate and maintain. Test examples on lithium insertion/extraction in two spinel-type LIB electrode materials (Li4Ti5O12 anode and LiMn2O4 cathode) are presented as well as first results on sodium extraction from a layered SIB cathode material (Na0.84Fe0.56Mn0.44O2).

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Section: A Limn 2 Osupporting

confidence: 85%

An electrochemical cell for in operando studies of lithium/sodium batteries using a conventional x-ray powder diffractometer

Shen

Pedersen

Christensen

et al. 2014

Review of Scientific Instruments

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“…Multiple cation-substituted LiMn 2 O 4 has been well reported [7,8], and it has been pointed out that co-doping of metal ions has a synergistic effect on the improvement of the cycle life. Our previous results [9] showed that dual doping of La and Zn into the LiMn 2 O 4 cathode material significantly enhanced the electrochemical performance such as cycling stability and charge capacity at high current. However, La as a rare metal is quite expensive.…”

Section: Introductionmentioning

confidence: 95%

Low content Ni and Cr co-doped LiMn2O4 with enhanced capacity retention

Iqbal

Khan

2017

Ionics

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Nanoparticles of the pure and Ni-Cr co-doped lithium manganese oxides Li[Ni x Cr y Mn 2-x-y ]O 4 (x = y = 0.01-0.05) have been synthesized by sol-gel method using citric acid as a chelating agent. The effect of low-content doping was noted reflecting the faster ionic movement in the cathode material. The phase structure and morphology of the materials are characterized by XRD, FTIR, SEM and TEM. Electrochemical and impedance measurements established that low-content Ni-Cr substitution substantially improves the structural stability and high rate cycling performance of LiMn 2 O 4 . Among all the investigated compositions, LiNi 0.01 Cr 0.01 Mn 1.98 O 4 demonstrated the best electrochemical performance. At a substantially high current rate of 5 C, 82% of the initial discharge capacity at 0.1 C is retained. Remarkably, after deep cycling at high rates, a discharge capacity of 104 mAhg −1 is resumed upon reducing the current rate to 0.1 C which is 91% of the specific capacity in the first cycle.

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“…This mainly results from (1) Jahn-Teller distortion inducing the irreversible phase transition from the cubic phase to tetrahedral phase; and (2) the dissolution of Mn 2+ into the electrolyte solution resulting from the disproportional reaction, 2Mn 3+ →Mn 2+ + Mn 4+ . 33 The results revealed that the LiLa 0.01 Zn 0.01 Mn 1.98 O 4 sample achieved a higher discharge capacity of 92 mAh/g and 78% of the initial discharge capacity at 5 C compared to values of 51 mAh/g and 41% for the undoped LiMn 2 O 4 sample. Surface modification can decrease the contact areas between the LiMn 2 O 4 particles and the electrolyte solution, and therefore inhibit the manganese dissolution.…”

Section: Introductionmentioning

confidence: 88%

“…9,10 Up to now, two main strategies, surface modification 11,12 and doping technology 13,14 , have been developed to solve the aforementioned capacity fading issue. 26,33,34 Moreover, the heavy element, bismuth, has been found to partially substitute manganese as a dopant. However, surface modification technology usually impairs the capacity and scarcely alleviates the Jahn-Teller distortion.…”

Section: Introductionmentioning

confidence: 99%

Improved electrochemical properties of LiMn₂O₄ with the Bi and La co-doping for lithium-ion batteries

et al. 2015

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A series of LiBi x La x Mn 2-2x O 4 (x=0, 0.002, 0.005, 0.010, 0.020) samples were synthesized by solution combustion synthesis in combination with calcination. The phase structure and morphology of the products were characterized by X-ray diffraction, scanning electron microscopy, and transition electron microscopy. The results demonstrated that a single-phase LiMn 2 O 4 spinel structure was obtained for the LiBi x La x Mn 2-2x O 4 (x=0, 0.002, 0.005) samples, whereas impurities were observed for the LiBi x La x Mn 2-2x O 4 (x=0.010, 0.020) samples as a result of the doping limit. The electrochemical properties were investigated by galvanostatic charge-discharge cycling and cycling voltammetry in a voltage range of 3.2-4.4 V. The substitution of Mn 3+ by equimolar Bi 3+ and La 3+ could significantly improve the structural stability and suppress the Jahn-Teller distortion, thereby resulting in improved electrochemical properties for the Bi and La co-doped samples in contrast with the pristine LiMn 2 O 4 sample.In particular, the LiBi 0.005 La 0.005 Mn 1.99 O 4 sample delivered a high initial discharge capacity of 130.2 mAh/g at 1 C, and following 80 cycles, the capacity retention was as high as 95.0%. Moreover, it also presented the best rate capability among all the samples, in which a high discharge capacity of 98.3 mAh/g was still maintained at a high rate of 7 C compared with that of 75.8 mAh/g for the pristine LiMn 2 O 4 sample.

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Enhanced electrochemical performance of La- and Zn-co-doped LiMn2O4 spinel as the cathode material for lithium-ion batteries

Cited by 30 publications

References 40 publications

An electrochemical cell for in operando studies of lithium/sodium batteries using a conventional x-ray powder diffractometer

An electrochemical cell for in operando studies of lithium/sodium batteries using a conventional x-ray powder diffractometer

Low content Ni and Cr co-doped LiMn2O4 with enhanced capacity retention

Improved electrochemical properties of LiMn₂O₄ with the Bi and La co-doping for lithium-ion batteries

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Enhanced electrochemical performance of La- and Zn-co-doped LiMn2O4 spinel as the cathode material for lithium-ion batteries

Cited by 30 publications

References 40 publications

An electrochemical cell for in operando studies of lithium/sodium batteries using a conventional x-ray powder diffractometer

An electrochemical cell for in operando studies of lithium/sodium batteries using a conventional x-ray powder diffractometer

Low content Ni and Cr co-doped LiMn2O4 with enhanced capacity retention

Improved electrochemical properties of LiMn2O4 with the Bi and La co-doping for lithium-ion batteries

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Improved electrochemical properties of LiMn₂O₄ with the Bi and La co-doping for lithium-ion batteries