The role of structural and electronic alterations on the lithium diffusion in LixCo0.5Ni0.5O2

Montoro, Luciano A.; Rosolen, José Maurício

doi:10.1016/j.electacta.2004.03.001

Cited by 52 publications

(39 citation statements)

References 26 publications

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“…(2), the apparent diffusion coefficient of Li-ions for Li 3 V 2 (PO 4 ) 3 /(C + MWCNTs) and Li 3 V 2 (PO 4 ) 3 /C is 6.2 × 10 −9 and 2.4 × 10 −9 , respectively. It is noticed that the diffusion coefficient of Li 3 V 2 (PO 4 ) 3 /(C + MWCNTs) is enhanced by MWCNTs adding, which can be attributed to its higher electronic conductivity [18,31,34].…”

Section: Resultsmentioning

confidence: 95%

Enhanced electrochemical performances of multi-walled carbon nanotubes modified Li3V2(PO4)3/C cathode material for lithium-ion batteries

Qiao

Mai

et al. 2011

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 95%

Enhanced electrochemical performances of multi-walled carbon nanotubes modified Li3V2(PO4)3/C cathode material for lithium-ion batteries

Qiao

Mai

et al. 2011

Journal of Alloys and Compounds

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“…For NC, however, Montoro et al 21 composite electrodes. The diffusivity data reported by Montoro ranged from ∼10 −10 to ∼5 × 10 −9 cm 2 s −1 over the entire Li-compositional window.…”

Section: Lithium Ion Diffusivity From Depolarization-mentioning

confidence: 99%

“…Surprisingly, there is limited, and conflicting, data on the basic transport properties of the NC/NCA family of compounds. [19][20][21][22][23] Cho et al, 19 and Montoro et al 20 determined the chemical diffusivity of LiNi 1-x Co x O 2 using GITT measurements of composite cathodes (e.g., NC powder combined with polymer binder and carbon additive), and reported results varying over several orders of magnitude. They also reported that the chemical diffusivity of Li x Ni 0.8 Co 0.2 O 2 is nearly independent of lithium content.…”

mentioning

confidence: 99%

Characterization of Electronic and Ionic Transport in Li_1-_xNi₀_.₈Co_0.15Al_0.05O₂(NCA)

Amin

Ravnsbæk

Chiang³

2015

J. Electrochem. Soc.

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Despite the extensive commercial use of Li 1-x Ni 0.8 Co 0.15 Al 0.05 O 2 (NCA) as the positive electrode in Li-ion batteries, and its long research history, its fundamental transport properties are poorly understood. These properties are crucial for designing high energy density and high power Li-ion batteries. Here, the transport properties of NCA are investigated using impedance spectroscopy and dc polarization and depolarization techniques. The electronic conductivity is found to increase with decreasing Li-content from ∼10 −4 Scm −1 to ∼10 −2 Scm −1 over x = 0.0 to 0.6, while lithium ion conductivity is at least five orders of magnitude lower for x = 0.0 to 0.75. A surprising result is that the lithium ionic diffusivity vs. x shows a v-shaped curve with a minimum at x = 0.5, while the unit cell parameters show the opposite trend. This suggests that cation ordering has greater influence on the composition dependence than the Li layer separation, unlike other layered oxides. From temperature-dependent measurements in electron-blocking cells, the activation energy for lithium ion conductivity (diffusivity) is found to be 1.25 eV (1.20 eV). Chemical diffusion during electrochemical use is limited by lithium transport, but is fast enough over the entire state-of-charge range to allow charge/discharge of micron-scale particles at practical C-rates. Cathodes having high energy and power density, adequate safety, excellent cycle life, and low cost are crucial for Li-ion batteries that can enable the commercialization of electric transportation.1 Towards this end, much research has previously focused on the development of the LiNi 1-x Co x O 2 (NC) 2-10 cathode due to its high capacity (∼275 mAh/g) and favorable operating cell voltage (4.3 V vs. Li/Li + ), which is within the voltage stability window of current liquid electrolytes. This compound also has lower cost than LiCoO 2 ; but despite extensive optimization, e.g., with respect to the Ni/Co ratio, 2-10 NC still suffers from poor structural stability during electrochemical cycling.11 Significant efforts were subsequently focused on improving structural stability by doping with small amounts of electrochemically inactive elements such as Al and Mg.12-17 One of the most promising compositions that emerged is Li 1 Ni 0.8 Co 0.15 Al 0.05 O 2 (NCA), currently in widespread commercial use. This intercalation material exhibits solid solution behavior during the extraction of lithium 3,4,18 and is structurally stable upon cycling. 2 The majority of studies of NCA have focused on structural and electrochemical characterization. Surprisingly, there is limited, and conflicting, data on the basic transport properties of the NC/NCA family of compounds. Thus our objective in this work is to systematically characterize and interpret the transport properties of NCA. We use additive-free, single phase sintered samples in which the extrinsic effects that may be present in composite electrodes are avoided. Using electron blocking and ion blocking cell configurations, respectively...

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“…The lithium diffusion coefficient of LVP-Cu is enhanced by 20 times to 2.8 × 10 −8 cm 2 s −1 by Cu adding. The lithium diffusion coefficient can be expressed as a product of a self-diffusion coefficient D Li(self) and a thermodynamic or Wagner factor˚ [25]: (3) D Li(self) and˚are very sensitive to the structural and electrical properties of an intercalation material, respectively [26]. X-ray diffraction showed that the structure of Li 3 V 2 (PO 4 ) 3 was not changed by Cu addition.…”

Section: Magnification (Insert Ofmentioning

confidence: 99%

Preparation and electrochemical studies of Li3V2(PO4)3/Cu composite cathode material for lithium ion batteries

Jiang

Wei

Pan

et al. 2009

Journal of Alloys and Compounds

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The role of structural and electronic alterations on the lithium diffusion in LixCo0.5Ni0.5O2

Cited by 52 publications

References 26 publications

Enhanced electrochemical performances of multi-walled carbon nanotubes modified Li3V2(PO4)3/C cathode material for lithium-ion batteries

Enhanced electrochemical performances of multi-walled carbon nanotubes modified Li3V2(PO4)3/C cathode material for lithium-ion batteries

Characterization of Electronic and Ionic Transport in Li_1-_xNi₀_.₈Co_0.15Al_0.05O₂(NCA)

Preparation and electrochemical studies of Li3V2(PO4)3/Cu composite cathode material for lithium ion batteries

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The role of structural and electronic alterations on the lithium diffusion in LixCo0.5Ni0.5O2

Cited by 52 publications

References 26 publications

Enhanced electrochemical performances of multi-walled carbon nanotubes modified Li3V2(PO4)3/C cathode material for lithium-ion batteries

Enhanced electrochemical performances of multi-walled carbon nanotubes modified Li3V2(PO4)3/C cathode material for lithium-ion batteries

Characterization of Electronic and Ionic Transport in Li1-xNi0.8Co0.15Al0.05O2(NCA)

Preparation and electrochemical studies of Li3V2(PO4)3/Cu composite cathode material for lithium ion batteries

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Characterization of Electronic and Ionic Transport in Li_1-_xNi₀_.₈Co_0.15Al_0.05O₂(NCA)