Effects of Mg-substitution in Li(Ni,Co,Al)O2 positive electrode materials on the crystal structure and battery performance

Kondo, Hiroki; Takeuchi, Yugo; Sasaki, Tsuyoshi; Kawauchi, Saju; Itou, Yuichi; Hiruta, Osamu; Okuda, Chikaaki; Yonemura, Masao; Kamiyama, Takashi; Ukyo, Yoshio

doi:10.1016/j.jpowsour.2007.06.035

Cited by 110 publications

(104 citation statements)

References 16 publications

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“…In the CV curve, the peak currents represent the electrochemical properties of the material and express the phase transitions that occur during the intercalation/deintercalation of lithium ions [28,29]. During the charge and discharge process, three pairs of peaks can be observed (I-I , II-II , and III-III ) in the CV diagram, which are attributed to hexagonal to monoclinic, monoclinic to hexagonal, and hexagonal to hexagonal phase transitions, respectively [30,31] In the case of NCA, the oxidation peaks around 3.84, 4.02, and 4.20 V denote I, II, and III, respectively. The corresponding reduction peaks around 3.66, 3.93, and 4.12 V denote I , II , and III .…”

Section: Resultsmentioning

confidence: 99%

“…The corresponding reduction peaks around 3.66, 3.93, and 4.12 V denote I , II , and III . The NCA-Mn and NCA-Ti electrodes exhibit a broad oxidation peak with shoulders near 3.94 and 3.79 V, respectively, which may result from the lower intensity of lithium clustering due to metal doping [30].…”

Section: Resultsmentioning

confidence: 99%

“…Studies have shown that the coulombic efficiency of NCA cathode is closely related to the interfacial resistance, which can be reduced significantly by metal doping [30,31]. The cycle performances of NCA, NCA-Mn, and NCA-Ti are shown in Figure 6(b).…”

Section: Resultsmentioning

confidence: 99%

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Effect of Metal (Mn, Ti) Doping on NCA Cathode Materials for Lithium Ion Batteries

Wan

Fan

Baasanjav

et al. 2018

Journal of Nanomaterials

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NCA (LiNi 0.85 Co 0.10 Al 0.05−x M x O 2 , M=Mn or Ti, < 0.01) cathode materials are prepared by a hydrothermal reaction at 170 ∘ C and doped with Mn and Ti to improve their electrochemical properties. The crystalline phases and morphologies of various NCA cathode materials are characterized by XRD, FE-SEM, and particle size distribution analysis. The CV, EIS, and galvanostatic charge/discharge test are employed to determine the electrochemical properties of the cathode materials. Mn and Ti doping resulted in cell volume expansion. This larger volume also improved the electrochemical properties of the cathode materials because Mn 4+and Ti 4+ were introduced into the octahedral lattice space occupied by the Li-ions to expand the Li layer spacing and, thereby, improved the lithium diffusion kinetics. As a result, the NCA-Ti electrode exhibited superior performance with a high discharge capacity of 179.6 mAh g −1 after the first cycle, almost 23 mAh g −1 higher than that obtained with the undoped NCA electrode, and 166.7 mAh g −1 after 30 cycles. A good coulombic efficiency of 88.6% for the NCA-Ti electrode is observed based on calculations in the first charge and discharge capacities. In addition, the NCA-Ti cathode material exhibited the best cycling stability of 93% up to 30 cycles.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Effect of Metal (Mn, Ti) Doping on NCA Cathode Materials for Lithium Ion Batteries

Wan

Fan

Baasanjav

et al. 2018

Journal of Nanomaterials

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“…37 Moreover the electrochemical behavior of bare and coated NCA samples as cathodes in Li-cells at elevated temperatures has not been fully studied yet. 40,41 Therefore, one of the motivating factors of the present work was to understand the influence of nano-sized LiAlO 2 • C. An important goal of this study was also to attest possible structural changes of bare and coated electrodes due to cycling. The novelty of the present research is that, for the first time, we obtained and analyzed significant results on the elevated temperature aging (the self-discharge) of bare and LiAlO 2 coated electrodes at 4.3 V. This paper continues our recent works on NCM and NCA electrodes in Li-cells.…”

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confidence: 99%

Studies of the Electrochemical Behavior of LiNi_0.80Co_0.15Al_0.05O₂Electrodes Coated with LiAlO₂

Srur-Lavi

Miikkulainen

Markovsky

et al. 2017

J. Electrochem. Soc.

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In this paper, we studied the influence of LiAlO 2 coatings of 0.5, 1 and 2 nm thickness prepared by Atomic Layer Deposition onto LiNi 0.8 Co 0.15 Al 0.05 O 2 electrodes, on their electrochemical behavior at 30 and 60 • C. It was demonstrated that upon cycling, 2 nm LiAlO 2 coated electrodes displayed ∼3 times lower capacity fading and lower voltage hysteresis comparing to bare electrodes. We established a correlation among the thickness of the LiAlO 2 coating and parameters of the self-discharge processes at 30 and 60 • C. Significant results on the elevated temperature cycling and aging of bare and LiAlO 2 coated electrodes at 4.3 V were obtained and analyzed for the first time. By analyzing of X-ray diffraction patterns of bare and 2 nm coated LiNi 0.8 Co 0.15 Al 0.05 O 2 electrodes after cycling, we concluded that cycled materials preserved their original structure described by R-3m space group and no additional phases were detected. The lithium-ion batteries (LIB) market nowadays has expanded widely from cellular phones, computers and other electronic devices to the automotive industry. Positive electrodes for LIBs to be explored in electric vehicles are mainly based on lithiated transition-metal oxides comprising Ni, Co and Mn (LiNi y Co x Mn 1-y-x O 2 ) and designated as NCM.1,2 They have attracted much attention as promising materials and therefore many research projects have been dedicated to them in the past 20 years. [3][4][5][6][7][8][9][10][11][12][13] In studies of LiNi 1/3 Co 1/3 Mn 1/3 O 2 (NCM333) cathodes, it was demonstrated 4-6 that they provided a capacity of 200 mAh/g in the voltage range of 2.5-4.6 V, or ∼155 mAh/g if the cutoff voltage is limited by 4.3 V.7 A substantially improved high-voltage performance of NCM333 electrodes (up to 4.6 V) was achieved by introducing tris(2,2,2-trifluoroethyl) borate additive in the electrolyte solution.8 These authors suggest that the additive takes part in the formation of the solid-electrolyte interface by lowering and stabilization of the interfacial resistance. NCM333 and NCM424 materials were studied in our group from the viewpoint of their electrochemical behavior, aging mechanisms, thermal properties, and surface chemistry developed upon cycling in ethylene carbonate-dimethyl carbonate/LiPF 6 based solutions.9 LiNi y Co x Mn 1-y-x O 2 materials with higher Ni content (y > 5) are important due to high capacity that can be extracted by charging up to 4.3 V only. However, Ni-rich NCMs suffer from their low cycling stability especially for compositions with Ni ≥ 60%, severe capacity fading and impedance increase during cycling at elevated temperatures (e.g. 45• C). One of the effective ways to stabilize the structure of NCM materials, to increase cycling activity and to diminish the heat evolution of the electrodes in a charged 14 There is a consensus in the literature that the above drawbacks originate from the unstable Ni 4+ ions developed in the charge state (high anodic potential, most Li + extracted from NCA). These Ni-ions can be readily reduce...

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“…During heating, the surface structures propagate towards to the core, and the rocksalt phase becomes the dominant structure due to the migration of Ni cations to the original Li sites at high temperature. Fortunately, the structure stability can be enhanced by surface modifying such as coating [69] and doping [70], just like LiCoO 2 .…”

Section: Lini 1−y−z Co Y Al Z O2 (Nca)mentioning

confidence: 99%

Layered and Spinel Structural Cathodes

Lyu

Huang

2015

Rechargeable Batteries

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Layered and spinel materials have been used successfully as intercalation-type cathode active materials in commercial Li-ion batteries. The physical and chemical properties, electrochemical reactions, structure evolution mechanisms, stability and safety issues have been widely investigated. Based on comprehensive fundamental researches, since 1980s, their electrochemical performances are improved continuous after various modifications, such as doping, surface coating, forming solid solution and composite, controlling morphology, size and crystallinity. Here, basic features of layered and spinel materials are summarized.

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Effects of Mg-substitution in Li(Ni,Co,Al)O2 positive electrode materials on the crystal structure and battery performance

Cited by 110 publications

References 16 publications

Effect of Metal (Mn, Ti) Doping on NCA Cathode Materials for Lithium Ion Batteries

Effect of Metal (Mn, Ti) Doping on NCA Cathode Materials for Lithium Ion Batteries

Studies of the Electrochemical Behavior of LiNi_0.80Co_0.15Al_0.05O₂Electrodes Coated with LiAlO₂

Layered and Spinel Structural Cathodes

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Effects of Mg-substitution in Li(Ni,Co,Al)O2 positive electrode materials on the crystal structure and battery performance

Cited by 110 publications

References 16 publications

Effect of Metal (Mn, Ti) Doping on NCA Cathode Materials for Lithium Ion Batteries

Effect of Metal (Mn, Ti) Doping on NCA Cathode Materials for Lithium Ion Batteries

Studies of the Electrochemical Behavior of LiNi0.80Co0.15Al0.05O2Electrodes Coated with LiAlO2

Layered and Spinel Structural Cathodes

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Studies of the Electrochemical Behavior of LiNi_0.80Co_0.15Al_0.05O₂Electrodes Coated with LiAlO₂