Enhanced electrochemical performance and thermal stability of La2O3-coated LiCoO2

Fey, George Ting‐Kuo; Muralidharan, P.; Lu, Cheng‐Zhang; Cho, Yung-Da

doi:10.1016/j.electacta.2006.01.024

Cited by 98 publications

(47 citation statements)

References 41 publications

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“…1 XRD patterns of bare powder and ZrO 2 -coated powder that the ZrO 2 coating remains on the surface layer of the core materials in the form of small particles. Although the ZrO 2 particles are not coated homogeneously on the surface, ZrO 2 coating on the core powder will influence the electrochemical properties [9]. The inhomogeneous coating of ZrO 2 can enable electrons and Li + ions to transfer more easily from the core powder to the exterior because ZrO 2 is an insulating oxide.…”

Section: Resultsmentioning

confidence: 99%

High-rate, high capacity ZrO2 coated Li[Li1/6Mn1/2Co1/6Ni1/6]O2 for lithium secondary batteries

et al. 2008

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Recently, there have been many reports on efforts to improve the rate capability and discharge capacity of lithium secondary batteries in order to facilitate their use for hybrid electric vehicles and electric power tools. In the present work, we present a ZrO 2 -coated Li[Li 1/6 Mn 1/2 Co 1/6 Ni 1/6 ]O 2 . The bare Li[Li 1/6 Mn 1/2 Co 1/6 Ni 1/6 ]O 2 shows a high initial discharge capacity of 224 mAh g -1 at a 0.2 C rate. Owing to the stability of ZrO 2 , it was possible to enhance the rate capability and cyclability. After 1 wt% ZrO 2 coating, the ZrO 2 -coated Li[Li 1/6 Mn 1/2 Co 1/6 Ni 1/6 ]O 2 showed a high discharge capacity of 115 mAh g -1 after 50 cycles under a 6 C rate, whereas the bare Li[Li 1/6 Mn 1/2 Co 1/6 Ni 1/6 ]O 2 showed a discharge capacity of only 40 mAh g -1 and very poor cyclability under the same conditions. Based on results of XRD and EIS measurements, it was found that the ZrO 2 suppressed impedance growth at the interface between the electrodes and electrolyte and prevented collapse of the layered hexagonal structure.

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Section: Resultsmentioning

confidence: 99%

High-rate, high capacity ZrO2 coated Li[Li1/6Mn1/2Co1/6Ni1/6]O2 for lithium secondary batteries

et al. 2008

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“…The impedance spectra exhibit two semicircles in the high and intermediate-frequency ranges and followed by a straight slopping line in the low frequency region. The high frequency semicircle is related the Li + ion migration resistance (R sei ) through the solid electrolyte interface (SEI) film that forms on the surface of the cathode materials; the intermediate frequency semicircle is attributed to the charge transfer resistance (R ct ) in the cathode/electrolyte interface; the low frequency tail is attribute to Warburg impedance that is associated with Li + diffusion through the cathode [25][26][27][28]. From the Fig.11, it could also see that the first semicircle has virtually no change of these two samples, which means the solid electrolyte interface layer formed on the surface of the electrode has no great difference.…”

Section: Materials Characterization and Electrochemical Measurementsmentioning

confidence: 99%

Combustion synthesis and electrochemical properties of LiNi_1/3Co_l/3Mn_l/3Br_xO_2-xand LiNi_1/3Co_l/3Mn_l/3Br_xO_2-x/graphene cathode material for Li-ion batteries

Zhu

Zhang

et al. 2016

MATEC Web of Conferences

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Abstract:The layered LiNi1/3Col/3Mnl/3BrxO2-x (0≤x≤0.09) cathode materials were prepared by a combustion method. The XRD results indicate that the Br-doped LiNi1/3Mn1/3Co1/3O2 has the same layered structure as the pristine LiNi1/3Mn1/3Co1/3O2. FE-SEM results indicate that the particle size distribution of samples is uniform. Electrochemical tests reveal that Br-doped samples exhibit higher discharge capacity and rate capability compared with the pristine, especially the LiNi1/3Col/3Mnl/3Br0.05O1.95 sample shows initial discharge capacity which can reach to 175.4 and 166.4mAh/g at 0.5 and 1.0C, respectively. Finally an electronically conducting 2D network of graphene was introduced into LiNi1/3Col/3Mnl/3Br0.05O1.95 cathode material. The electrochemical properties of the materials were investigated by charge-discharge tests and electrochemical impedance spectroscopy. The charge-discharge tests demonstrate that this sample has better cycle stability than LiNi1/3Col/3Mnl/3Br0.05O1.95 which can be attributed to the excellent electronic conductivity and stable chemical properties of graphene. The EIS results reveal that the graphene coated greatly decreases the resistance of lithium batteries, especially the charge transfer resistance which can be attributed to the significantly improved electronic conductivity.

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“…These surface coating materials include metals (Zn [5]) ,oxides (ZnO [6], Al2O3 [7][8] [18], TiO2 [19], CoAl2O4 [20]), phosphates (Li3PO4 [21], FePO4 [22]), fluorides (AlF3 [23]), GaF3 [24]) and some conductive components (carbon nanotubes [25], or graphene [26]). La2O3 with excellent thermal stability has been used to coat the LiCoO2 and improve the electrochemical performances [27]. In our previous work, we use the La2O3 to modify the LTO to suppress the electrolyte decomposition and enhance the rate capacity of LTO anode material [28].…”

Section: Introductionmentioning

confidence: 99%

Improved electrochemical performance of 5 V spinel LiNi_0.5Mn_1.5O₄ by La₂O₃ surface coating for Li-ion batteries

Wei

Zhang

et al. 2018

MATEC Web Conf.

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Abstract. LiNi0.5Mn1.5O4 coated with 1.5 wt.% La2O3 was prepared and investigated as cathode materials for lithium ion batteries. The samples was characterized by XRD, SEM and EDX. After the 1.5 wt.% La2O3 coating, the lattice structure of LiNi0.5Mn1.5O4 is not destroyed and a La2O3 coating layer has formed on the surface of LiNi0.5Mn1.5O4 particles. The 1.5 wt.% La2O3-coated LiNi0.5Mn1.5O4 exhibits a higher rate capacity, with discharge capacity between 3.5 and 5 V of 131.9, 127.1, 126.5, 120.7, 114.1 and 101.5 mAh g -1 at rates of 0.2, 0.5, 1, 2, 3 and 5 C (1 C = 140 mAh g -1 ), respectively. The results indicate that the La2O3 coating could reduce the electrode polarization and enhance the rate capacities.

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Enhanced electrochemical performance and thermal stability of La2O3-coated LiCoO2

Cited by 98 publications

References 41 publications

High-rate, high capacity ZrO2 coated Li[Li1/6Mn1/2Co1/6Ni1/6]O2 for lithium secondary batteries

High-rate, high capacity ZrO2 coated Li[Li1/6Mn1/2Co1/6Ni1/6]O2 for lithium secondary batteries

Combustion synthesis and electrochemical properties of LiNi_1/3Co_l/3Mn_l/3Br_xO_2-xand LiNi_1/3Co_l/3Mn_l/3Br_xO_2-x/graphene cathode material for Li-ion batteries

Improved electrochemical performance of 5 V spinel LiNi_0.5Mn_1.5O₄ by La₂O₃ surface coating for Li-ion batteries

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Enhanced electrochemical performance and thermal stability of La2O3-coated LiCoO2

Cited by 98 publications

References 41 publications

High-rate, high capacity ZrO2 coated Li[Li1/6Mn1/2Co1/6Ni1/6]O2 for lithium secondary batteries

High-rate, high capacity ZrO2 coated Li[Li1/6Mn1/2Co1/6Ni1/6]O2 for lithium secondary batteries

Combustion synthesis and electrochemical properties of LiNi1/3Col/3Mnl/3BrxO2-xand LiNi1/3Col/3Mnl/3BrxO2-x/graphene cathode material for Li-ion batteries

Improved electrochemical performance of 5 V spinel LiNi0.5Mn1.5O4 by La2O3 surface coating for Li-ion batteries

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Combustion synthesis and electrochemical properties of LiNi_1/3Co_l/3Mn_l/3Br_xO_2-xand LiNi_1/3Co_l/3Mn_l/3Br_xO_2-x/graphene cathode material for Li-ion batteries

Improved electrochemical performance of 5 V spinel LiNi_0.5Mn_1.5O₄ by La₂O₃ surface coating for Li-ion batteries