Improved cycling and rate performance of Sm-doped LiNi0.5Mn1.5O4 cathode materials for 5V lithium ion batteries

Mo, Mingyue; Hui, K.S.; Hong, Xiaoting; Guo, Junjun; Ye, Chengcong; Li, Aiju; Hu, Nanqian; Huang, Zhenze; Jiang, Jianhui; Jing-zhi, Liang; Chen, Hongyu

doi:10.1016/j.apsusc.2013.11.094

Cited by 82 publications

(43 citation statements)

References 34 publications

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“…The characteristic binding energy located at 854.6 eV with a satellite peak at 860.5 eV in the Ni 2p 3/2 XPS spectrum for uncharged Li 2 NiTiO 4 electrode could be assigned to Ni 2+ species. The above observations are in agreement with the reported values in LiNi 0.5 Mn 0.5 O 2 , LiNi 1/3 Mn 1/3 Co 1/3 O 2 and LiNi 0.5 Mn 1.5 O 4 [12-14]. The Ni 2p 3/2 binding energy gives positive shift when the electrode is charged to 4.9 V, and the two peaks at 855.5 and 856.9 eV are corresponding to the binding energy of Ni 3+ and Ni 4+ [15], respectively.…”

Section: Resultssupporting

confidence: 92%

Facile molten salt synthesis of Li2NiTiO4 cathode material for Li-ion batteries

Wang

2014

Nanoscale Res Lett

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Well-crystallized Li2NiTiO4 nanoparticles are rapidly synthesized by a molten salt method using a mixture of NaCl and KCl salts. X-ray diffraction pattern and scanning electron microscopic image show that Li2NiTiO4 has a cubic rock salt structure with an average particle size of ca. 50 nm. Conductive carbon-coated Li2NiTiO4 is obtained by a facile ball milling method. As a novel 4 V positive cathode material for Li-ion batteries, the Li2NiTiO4/C delivers high discharge capacities of 115 mAh g-1 at room temperature and 138 mAh g-1 and 50°C, along with a superior cyclability.

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Section: Resultssupporting

confidence: 92%

Facile molten salt synthesis of Li2NiTiO4 cathode material for Li-ion batteries

Wang

2014

Nanoscale Res Lett

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“…80-2162) [23]. This indicates that the substitution of Er 3+ ions for partial nickel and manganese ions has very little effect on the intrinsic structure [24,25,26,27]. Notably, the diffraction peaks show a small shift to smaller 2θ angle for the Er-doped LiNi 0.5 Mn 1.5 O 4 sample with the introduction of a certain amount of Er 3+ ions.…”

Section: Resultsmentioning

confidence: 99%

“…This phenomenon can be interpreted as the successful incorporation of Er 3+ ions into the crystal structure and an increase of the unit cell volume of the Er-doped LiNi 0.5 Mn 1.5 O 4 . These results can be associated with the fact that the radius of Er 3+ ions (1.04 Å) [20] is bigger than that of Mn 4+ ions (0.53 Å) [25,26] and Ni ions (0.69 Å) [9]. According to the research results [18,27], if the dopant ions are located on the tetrahedral (8a) sites, the intensity of (220) peak, which arises only from the diffraction of the tetrahedral sites, must increase, even if the doping concentration is very low.…”

Section: Resultsmentioning

confidence: 99%

Er-Doped LiNi0.5Mn1.5O4 Cathode Material with Enhanced Cycling Stability for Lithium-Ion Batteries

et al. 2017

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The Er-doped LiNi0.5Mn1.5O4 (LiNi0.495Mn1.495Er0.01O4) sample was successfully prepared by citric acid-assisted sol-gel method with erbium oxide as an erbium source for the first time. Compared with the undoped sample, the Er-doped LiNi0.5Mn1.5O4 sample maintained the basic spinel structure, suggesting that the substitution of Er3+ ions for partial nickel and manganese ions did not change the intrinsic structure of LiNi0.5Mn1.5O4. Moreover, the Er-doped LiNi0.5Mn1.5O4 sample showed better size distribution and regular octahedral morphology. Electrochemical measurements indicated that the Er-doping could have a positive impact on the electrochemical properties. When cycled at 0.5 C, the Er-doped LiNi0.5Mn1.5O4 sample exhibited an initial discharge capacity of 120.6 mAh·g−1, and the capacity retention of this sample reached up to 92.9% after 100 cycles. As the charge/discharge rate restored from 2.0 C to 0.2 C, the discharge capacity of this sample still exhibited 123.7 mAh·g−1 with excellent recovery rate. Since the bonding energy of Er-O (615 kJ·mol−1) was higher than that of Mn-O (402 kJ·mol −1) and Ni-O (392 kJ·mol−1), these outstanding performance could be attributed to the increased structure stability as well as the reduced aggregation behavior and small charge transfer resistance of the Er-doped LiNi0.5Mn1.5O4.

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“…7f, which should be assigned to Mn 3+ /Mn 4+ redox couple [25], indicating the characteristics of the disordered Fd3m spinel structure [9]. The two separating peaks are at approximately 4.7 V, corresponding to Ni 2+ /Ni 3+ and Ni 3+ / Ni 4+ redox couples [26]. It is clear that the intensity of the peak at approximately 4.7 V tended to decrease with the content of Ga, which is caused by the substitution of electrically active Ni by Ga.…”

Section: Resultsmentioning

confidence: 99%

Enhancement of the electrochemical performance of the spinel structure LiNi0.5-xGaxMn1.5O4 cathode material by Ga doping

Lan

et al. 2018

Nanoscale Res Lett

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A sol-gel method was adopted to obtain LiNi0.5-xGaxMn1.5O4 (x = 0, 0.04, 0.06, 0.08, 0.1) samples. The effect of Ga doping on LiNi0.5Mn1.5O4 and its optimum content were investigated, and the electrochemical properties at room temperature and at a high temperature were discussed. The structural, morphological, and vibrational features of LiNi0.5-xGaxMn1.5O4 (x = 0, 0.04, 0.06, 0.08, 0.1) compounds were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FT-IR). The XRD results demonstrate that all samples have a disordered spinel structure with a space group of Fd3m, and Ga doping restrains the formation of the LixNi1-xO secondary phase. FT-IR analysis reveals that Ga doping increases the degree of cation disorder. The SEM results reveal that all samples possess a fine spinel octahedron crystal. The electrochemical performance of the samples was investigated by galvanostatic charge/discharge tests, dQ/dV plots, and electrochemical impedance spectroscopy (EIS). The LiNi0.44Ga0.06Mn1.5O4 sample with the optimum content shows a superior rate performance and cycle stability after Ga doping, especially at a high discharge rate and high temperature. In addition, the LiNi0.44Ga0.06Mn1.5O4 sample retained 98.3% of its initial capacity of 115.7 mAhg−1 at the 3 C discharge rate after 100 cycles, whereas the pristine sample delivered a discharge capacity of 87.3 mAhg−1 at 3 C with a capacity retention of 80% at the 100th cycle. Compared with the pristine material, the LiNi0.44Ga0.06Mn1.5O4 sample showed a high capacity retention from 74 to 98.4% after 50 cycles at a 1 C discharge rate and 55 °C.

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Improved cycling and rate performance of Sm-doped LiNi0.5Mn1.5O4 cathode materials for 5V lithium ion batteries

Cited by 82 publications

References 34 publications

Facile molten salt synthesis of Li2NiTiO4 cathode material for Li-ion batteries

Facile molten salt synthesis of Li2NiTiO4 cathode material for Li-ion batteries

Er-Doped LiNi0.5Mn1.5O4 Cathode Material with Enhanced Cycling Stability for Lithium-Ion Batteries

Enhancement of the electrochemical performance of the spinel structure LiNi0.5-xGaxMn1.5O4 cathode material by Ga doping

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