Surface properties of LiCoO2, LiNiO2 and LiNi1−xCoxO2

Moses, Anthony W.; Flores, Harry G García; Kim, Jong-Gyu; Langell, M. A.

doi:10.1016/j.apsusc.2006.10.044

Cited by 173 publications

(153 citation statements)

References 65 publications

(86 reference statements)

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“…Figure 7b shows the binding energy corresponding to Li 1s core levels in the region 52-56 eV. The fitting and deconvolution of Li (1s) spectrum gives the major peak binding energy at 54.5 eV, which is similar to lithium in an octahedral environment of oxygen atoms, such as in LiCoO 2 [41]. Figure 7c shows the O 1s spectrum, which has a main peak around 529 eV and another peak at 533 eV that can be deconvoluted to three individual contributions [34,42].…”

Section: Xps Studiesmentioning

confidence: 89%

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Optimization and Characterization of Lithium Ion Cathode Materials in the System (1 – x – y)LiNi0.8Co0.2O2 • xLi2MnO3 • yLiCoO2

2010

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Abstract:There is ongoing effort to identify novel materials that have performance better than LiCoO 2 . The objective of this work is to explore materials in the system (1 -x -y) LiNi 0.8 Co 0.2 O 2 • xLi 2 MnO 3 • yLiCoO 2 . A ternary composition diagram was used to identify sample points, and compositions for testing were initially chosen. Detailed characterization of the synthesized materials was done, including Rietveld Refinement of XRD data, XPS analysis for valence state of transition-metals, SEM for microstructure details, and TGA for thermal stability of the materials. Electrochemical performance showed that discharge capacities on the order of 230 mAh/g were obtained. Preliminary results showed that these materials exhibit good cycling capabilities thereby positioning these materials as promising for Li-ion battery applications.

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Section: Xps Studiesmentioning

confidence: 89%

“…The satellite peak at 860 eV is attributed to the multiple splitting in the energy levels of the Ni-containing oxides such as NiO or LiNiO 2 . The XPS results showed that the predominant state of Ni in the synthesized material is 2+ [41]. Figure 7b shows the binding energy corresponding to Li 1s core levels in the region 52-56 eV.…”

Section: Xps Studiesmentioning

confidence: 99%

Optimization and Characterization of Lithium Ion Cathode Materials in the System (1 – x – y)LiNi0.8Co0.2O2 • xLi2MnO3 • yLiCoO2

2010

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“…A layered structure LiCoO 2 is used as a cathode active material in the LIB, due to the fact that LiCoO 2 has ease of preparation, high energy density, high operational voltage, and good cycleability. However, LiCoO 2 has high cost, toxicity, and low discharge capacity, so efforts are being made in attempts to find alternative materials [1,2]. Currently, these alternative materials, such as LiNiO 2 , LiMn 2 O 4 , LiN 1/3 Co 1/3 Mn 1/3 O 2 , and LiFePO 4 , and others are being researched and studied.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical characteristics of LiFePO4/LiCoO2 mixed electrode for Li secondary battery

et al. 2008

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LiFePO 4 cathode active material was synthesized using a solid state method and a mixed cathode was prepared by adding LiCoO 2 . A coin cell was prepared using the mixed cathode and its electrochemical performances were evaluated. The LiFePO 4 material improved both in thermal stability and rate capability. The discharge capacity of the 5 wt.% LiCoO 2 -added LiFePO 4 material was 139.4 mAh/g at 0.2 C rate, and it showed a capacity retention of 64.2% even at 5 C rate in comparison to 0.2 C rate. The cycle performance of the bare LiFePO 4 material was excellent, but the capacity fading of 20 wt.% LiCoO 2 -added LiFePO 4 material became significant during charge/discharge cycle. However, 5∼10 wt.% LiCoO 2 -added LiFePO 4 material showed good thermal stability, high rate capability and good cycle performances.

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“…The satellite peak at 860 eV is due to the multiple splitting in the energy levels. XPS results strongly suggested the predominant state of Ni synthesized in the material is 2+ [39,40].…”

Section: Xps Studiesmentioning

confidence: 99%

Synthesis and characterization of oxide cathode materials of the system (1-x-y)LiNiO2·xLi2MnO3·yLiCoO2

Madhu

Garrett

Venkatesan

2010

Ionics

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Composite cathode materials produced by integrating isostructural (2D-layered) compounds LiNiO 2 , LiCoO 2 , and Li 2 MnO 3 (Li(Li 1/3 Mn 2/3 )O 2 ) have been investigated utilizing a compositional phase diagram. The samples were characterized by multiple techniques to establish structure-property relationships. Specifically, for structural characterization, powder X-ray diffraction, scanning electron microscopy, thermo-gravimetric analysis, and X-ray photoelectron spectroscopy were carried out. For properties, electrochemical characterization was carried out. The best composition showed a discharge capacity of 244 mAh/g (C/15 rate) in the testing range of 4.6-2 V, with good coulombic efficiency and cyclability.

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Surface properties of LiCoO2, LiNiO2 and LiNi1−xCoxO2

Cited by 173 publications

References 65 publications

Optimization and Characterization of Lithium Ion Cathode Materials in the System (1 – x – y)LiNi0.8Co0.2O2 • xLi2MnO3 • yLiCoO2

Optimization and Characterization of Lithium Ion Cathode Materials in the System (1 – x – y)LiNi0.8Co0.2O2 • xLi2MnO3 • yLiCoO2

Electrochemical characteristics of LiFePO4/LiCoO2 mixed electrode for Li secondary battery

Synthesis and characterization of oxide cathode materials of the system (1-x-y)LiNiO2·xLi2MnO3·yLiCoO2

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