In operando X-ray absorption spectroscopy study of charge rate effects on the atomic environment in graphene-coated Li-rich mixed oxide cathode

Kim, Tae-Hoon; Song, Bang‐Sup; Lunt, Alexander J.G.; Cibin, Giannantonio; Dent, Andrew J.; Li, Lü; Korsunsky, Alexander M.

doi:10.1016/j.matdes.2016.03.028

Cited by 21 publications

(11 citation statements)

References 42 publications

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“…The oxgen loss was found to occur in the Mn‐O ligand environments. Kim et al investigated the charge rate effects on the local structures in Li(Li 0.2 Mn 0.54 Ni 0.13 Co 0.13 )O 2 using novelly designed operando XAS coin cells . By comparing the features of XANES/EXAFS spectra at fast (0.5 C) and slow (0.125 C) charge rates, two separated local structural environments were identified due to the Jahn–Teller distortion.…”

Section: Examples Of Applications In Lib‐researchesmentioning

confidence: 99%

In Situ Probing Multiple‐Scale Structures of Energy Materials for Li‐Ion Batteries

et al. 2019

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Knowledge of atomic interactions with high‐energy photons or particles has opened a window to the microscopic structures of materials. In particular, X‐rays and neutrons interact with electrons and nuclei of atoms in different ways, which enables their complementary scattering, spectroscopic, and imaging capabilities for structural characterizations. In the past decades, techniques based on X‐ray and neutron interactions, capable of being time‐resolved and combined, have been well developed for encoding structures in various length, elemental and temporal levels, and, in turn, have ignited breakthroughs in the field of battery science and engineering. Herein are reviewed the advanced in situ X‐ray and neutron techniques for studying lithium‐ion batteries, which offer dynamic observations of chemical, electronic, and geometric changes during realistic battery operations. For each of the techniques, with a brief description of the theory on account of characterizing principles is given (i.e., scattering, excitation, and emission), followed by an introduction of operando methodologies including instruments, setups, and cell designs employed in synchrotron and neutron beamlines. Finally, a few practical examples are presented to demonstrate the applicability of these techniques in studying Li‐ion batteries, with a particular emphasis on each of their structural sensitivities at various time, elemental, and length levels.

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Section: Examples Of Applications In Lib‐researchesmentioning

confidence: 99%

In Situ Probing Multiple‐Scale Structures of Energy Materials for Li‐Ion Batteries

et al. 2019

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“…During the first charging step described in the voltage profile in Figure 2, Ni 2+ and Co 3+ are oxidized as with standard, LiNi x Co y Mn z O 2 layered materials. 14,19,20,39 Subsequent redox activity is more complex, with further study required before consensus. 14,19,20 The activation peak will be discussed in the following paragraph.…”

Section: Redox Designations Of Li-rich Materialsmentioning

confidence: 99%

“…14,39 As stated above, due to the difficulties of interpreting XAS and a wide variety of sample compositions that may perform differently, these redox designations are not fully accepted, especially for the potential range of reversible O 2− /(O 2 ) n− redox activity. 14,19,20 Further intensive studies are sure to come before these controversies are settled.…”

Section: Redox Designations Of Li-rich Materialsmentioning

confidence: 99%

Review—Recent Advances and Remaining Challenges for Lithium Ion Battery Cathodes

Erickson

Schipper

Penki

et al. 2017

J. Electrochem. Soc.

158

103

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Electrodes prepared from lithium-rich (Li-rich) xLi 2 MnO 3 ·(1-x)LiNi a Co b Mn c O 2 materials (a + b + c = 1) show extremely high discharge capacities, arising from excess Li + present in their Li 2 MnO 3 component, and the ability to reversibly store charge with O 2− anions. These electrodes suffer serious voltage and capacity fading however, due to the migration of transition metals to the Li-layer at advanced states of charging, partial structural layered-to-spinel transformation and other reasons. In this focus paper, the current understanding of the above materials is summarized, briefly concluding with attempts by our groups to mitigate the voltage and capacity fade of these electrodes.

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“…In addition, nickel acts as a stabilizer to reduce the complete transformation of manganese by substitution. The preferential reduction of Ni 4+/2+ maintains average oxidation state of Mn above 3+, as well as suppresses the Jahn-Teller effect caused by Mn 3+ ions and effectively improves structural durability [41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Composition on Voltage Attenuation of Li-Rich Cathode Material for Lithium-Ion Batteries

Liu

Zhu

et al. 2019

Materials

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Li-rich layered oxide cathode materials have become one of the most promising cathode materials for high specific energy lithium-ion batteries owning to its high theoretical specific capacity, low cost, high operating voltage and environmental friendliness. Yet they suffer from severe capacity and voltage attenuation during prolong cycling, which blocks their commercial application. To clarify these causes, we synthesize Li1.5Mn0.55Ni0.4Co0.05O2.5 (Li1.2Mn0.44Ni0.32Co0.04O2) with high-nickel-content cathode material by a solid-sate complexation method, and it manifests a lot slower capacity and voltage attenuation during prolong cycling compared to Li1.5Mn0.66Ni0.17Co0.17O2.5 (Li1.2Mn0.54Ni0.13Co0.13O2) and Li1.5Mn0.65Ni0.25Co0.1O2.5 (Li1.2Mn0.52Ni0.2Co0.08O2) cathode materials. The capacity retention at 1 C after 100 cycles reaches to 87.5% and the voltage attenuation after 100 cycles is only 0.460 V. Combining X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscopy (TEM), it indicates that increasing the nickel content not only stabilizes the structure but also alleviates the attenuation of capacity and voltage. Therefore, it provides a new idea for designing of Li-rich layered oxide cathode materials that suppress voltage and capacity attenuation.

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In operando X-ray absorption spectroscopy study of charge rate effects on the atomic environment in graphene-coated Li-rich mixed oxide cathode

Cited by 21 publications

References 42 publications

In Situ Probing Multiple‐Scale Structures of Energy Materials for Li‐Ion Batteries

In Situ Probing Multiple‐Scale Structures of Energy Materials for Li‐Ion Batteries

Review—Recent Advances and Remaining Challenges for Lithium Ion Battery Cathodes

Effect of Different Composition on Voltage Attenuation of Li-Rich Cathode Material for Lithium-Ion Batteries

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