Electrochemical properties of LiNi1−yTiyO2 and LiNi0.975M0.025O2 (M=Zn, Al, and Ti) synthesized by the solid-state reaction method

Song, Myoung Youp; Lee, Dong Sub; Park, Hye Ryoung

doi:10.1016/j.materresbull.2012.01.003

Cited by 36 publications

(10 citation statements)

References 40 publications

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“…Thereby, common strategies rely on lattice doping into the transition metal layer to enhance the structural stability of the cathodes. 9 Typically, dopant elements, such as Mg, 10 Ca, 11 Al, 12 and Ti, 13,14 are intended to prevent Ni 2+ migration into the lithium layer 15 and to strengthen the metal-oxygen bonding in order to restrain oxygen release and improve the thermal stability. 7 Another approach to mitigate the performance decay of such cathode materials is the application of a protective surface coating.…”

Section: Context and Scalementioning

confidence: 99%

Dual-anion ionic liquid electrolyte enables stable Ni-rich cathodes in lithium-metal batteries

Fang

Kuenzel

et al. 2021

Joule

128

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Exploiting the high-energy density of lithium metal as a negative electrode for lithium batteries is considered a prerequisite to satisfy the continually increasing demand for extended driving range of electric vehicles and fully electrify our mobility and transportation. However, such lithium-metal batteries face critical safety and life-span concerns. This work outlines a clear route toward realizing safe high-energy-density lithium-metal batteries with excellent cycling stability through the use of a non-flammable and low-volatile ionic liquid electrolyte.

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Section: Context and Scalementioning

confidence: 99%

Dual-anion ionic liquid electrolyte enables stable Ni-rich cathodes in lithium-metal batteries

Fang

Kuenzel

et al. 2021

Joule

128

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“…Recently, several approaches have emerged toward overcoming the aforementioned issues (e.g., modifying the composition, surface coatings, and morphology tailoring of the active material particles). − Among these approaches, one of the most promising and most used strategies is cation doping. However, cation doping strategies are still empirical, and the exact stabilization effects have yet to be elucidated. ,− Up to now, the effects of cation doping can be summarized as follows: Enhanced electrochemical performance and structural stability through the incorporation of elements, which improve the electrochemical properties and stabilize the structural framework. − Mitigation of Ni 2+ ion migration from the TM slab to the Li slab during electrochemical cycling by stabilizing Ni 3+ or by augmenting electrostatic repulsion Increased bonding strength between oxygen and the metal ions, resulting in increased structural stability and less oxygen evolution. , …”

Section: Introductionmentioning

confidence: 99%

“…Notably, the complete replacement of Mn by Al leads to Li[Ni 0.8 Co 0.15 Al 0.05 ]O 2 , which is a key state-of-the-art material for automotive battery applications . Titanium, ,,− chromium, , and iron , have also been used to influence the properties of the active material with some success. Despite the appreciable number of dopants that has already been used, there is still much room for the improvement of cathode material properties.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Fluorine and Nitrogen as Anionic Dopants in Nickel-Rich Cathode Materials for Lithium-Ion Batteries

Binder

Culver

Pinedo

et al. 2018

ACS Appl. Mater. Interfaces

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Advanced lithium-ion batteries are of great interest for consumer electronics and electric vehicle applications; however, they still suffer from drawbacks stemming from cathode active material limitations (e.g., insufficient capacities and capacity fading). One approach for alleviating such limitations and stabilizing the active material structure may be anion doping. In this work, fluorine and nitrogen are investigated as potential dopants in Li1.02(Ni0.8Co0.1Mn0.1)0.98O2 (NCM) as a prototypical nickel-rich cathode active material. Nitrogen doping is achieved by ammonia treatment of NCM in the presence of oxygen, which serves as an unconventional and new approach. The crystal structure was investigated by means of Rietveld and pair distribution function analysis of X-ray diffraction data, which provide very precise information regarding both the average and local structure, respectively. Meanwhile, time-of-flight secondary-ion mass spectroscopy was used to assess the efficacy of dopant incorporation within the NCM structure. Moreover, scanning electron microscopy and scanning transmission electron microscopy were conducted to thoroughly investigate the dopant influences on the NCM morphology. Finally, the electrochemical performance was tested via galvanostatic cycling of half- and full-cells between 0.1 and 2 C. Ultimately, a dopant-dependent modulation of the NCM structure was found to enable the enhancement of the electrochemical performance, thereby opening a route to cathode active material optimization.

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“…Over the past decade, most of the progress in enhancing the electrochemical performance of NCM cathode materials has been made by lattice doping, − surface modification, − tuning the material composition, , and building core–shell or concentration gradient architectures. − ,− Among these strategies, surface modification is widely adopted as a promising way to mitigate the irreversible side reactions with the electrolyte and suppress the crystal collapse during long-term cycling of LIBs, thus significantly stabilizing the structure of NCM cathode materials. The typical metal oxides (Al 2 O 3 , , TiO 2 , and V 2 O 5 , ), fluorides (AlF 3 ), phosphate, , and spinels were widely adopted to modify the cathode materials.…”

Section: Introductionmentioning

confidence: 99%

Alleviating Surface Degradation of Nickel-Rich Layered Oxide Cathode Material by Encapsulating with Nanoscale Li-Ions/Electrons Superionic Conductors Hybrid Membrane for Advanced Li-Ion Batteries

Yao

et al. 2016

ACS Appl. Mater. Interfaces

133

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Nickel-rich layered oxide cathode materials for advanced lithium-ion batteries have received much attention recently because of their high specific capacities and significant reduction of cost. However, these cathodes are facing a fundamental challenge of loss in performance as a result of surface lithium residue, side reactions with the electrolyte and structure rearrangement upon long-term cycling. Herein, by capturing the lithium residue on the surface of LiNiCoMnO (NCM) cathode material as Li source, we propose a hybrid coating strategy incorporating lithium ions conductor LiAlO with superconductor LiTiO to overcome those obstinate issues. By taking full advantage of this unique hybrid nanomembrane coating architecture, both the lithium ion diffusion ability and electronic conductivity of LiNiCoMnO cathode material are improved, resulting in remarkably enhanced electrochemical performances during high voltage operation, including good cycle performance, high reversible capacity, and excellent rate capability. A high initial discharge capacity of 227 mAh g at 4.4 V cutoff voltage with Coulombic efficiency of 87.3%, and reversible capacity of 200 mAh g with 98% capacity retention after 100 cycles at a current density of 0.5 C can be attained. The improved electrochemical performance can be attributed to the synergetic contribution from the removal of lithium residues and the unique hybrid nanomembrane coating architecture. Most importantly, this surface modification technique could save some cost, simplify the technical procedure, and show great potential to optimize battery performance, apply in a large scale and extend to all nickel-rich cathode material.

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Electrochemical properties of LiNi1−yTiyO2 and LiNi0.975M0.025O2 (M=Zn, Al, and Ti) synthesized by the solid-state reaction method

Cited by 36 publications

References 40 publications

Dual-anion ionic liquid electrolyte enables stable Ni-rich cathodes in lithium-metal batteries

Dual-anion ionic liquid electrolyte enables stable Ni-rich cathodes in lithium-metal batteries

Investigation of Fluorine and Nitrogen as Anionic Dopants in Nickel-Rich Cathode Materials for Lithium-Ion Batteries

Alleviating Surface Degradation of Nickel-Rich Layered Oxide Cathode Material by Encapsulating with Nanoscale Li-Ions/Electrons Superionic Conductors Hybrid Membrane for Advanced Li-Ion Batteries

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