High reactivity of the nickel-rich LiNi1-x-yMnxCoyO2 layered materials surface towards H2O/CO2 atmosphere and LiPF6-based electrolyte

Martinez, Ana; Grugeon, Sylvie; Cailleu, Dominique; Courty, Matthieu; Tran-Van, Pierre; Delobel, Bruno; Laruelle, Stéphane

doi:10.1016/j.jpowsour.2020.228204

Cited by 84 publications

(56 citation statements)

References 39 publications

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“…EGA-MS investigation allowed proposing the formation and the decomposition mechanisms by the evolution profile in the 50–500 °C region. Interestingly, the results also highlighted an in situ lithiated layered oxide material reformation reaction [ 297 ].…”

Section: Applications To Batteries and Conducting Materialsmentioning

confidence: 99%

On-Line Thermally Induced Evolved Gas Analysis: An Update—Part 1: EGA-MS

et al. 2022

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Advances in on-line thermally induced evolved gas analysis (OLTI-EGA) have been systematically reported by our group to update their applications in several different fields and to provide useful starting references. The importance of an accurate interpretation of the thermally-induced reaction mechanism which involves the formation of gaseous species is necessary to obtain the characterization of the evolved products. In this review, applications of Evolved Gas Analysis (EGA) performed by on-line coupling heating devices to mass spectrometry (EGA-MS), are reported. Reported references clearly demonstrate that the characterization of the nature of volatile products released by a substance subjected to a controlled temperature program allows us to prove a supposed reaction or composition, either under isothermal or under heating conditions. Selected 2019, 2020, and 2021 references are collected and briefly described in this review.

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Section: Applications To Batteries and Conducting Materialsmentioning

confidence: 99%

On-Line Thermally Induced Evolved Gas Analysis: An Update—Part 1: EGA-MS

et al. 2022

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“…Consequently, when Ni-rich layered oxides are exposed to ambient air, the active oxygen species will react with the absorbed moisture and CO 2 to form hydroxyl and carbonate species, along with the release of lattice oxygen to form oxygen gas. The formed hydroxyl and carbonate species react with lithium ions from host material and finally generate residual lithium compounds (mainly LiOH and Li 2 CO 3 ), together with the phase transition from a layered structure to a NiO-like rocksalt structure (Huang et al, 2019a;Martinez et al, 2020). The total reaction can be expressed as the following equations:…”

Section: Sources Of Residual Lithium Compounds Excessive Addition Of mentioning

confidence: 99%

The Formation, Detriment and Solution of Residual Lithium Compounds on Ni-Rich Layered Oxides in Lithium-Ion Batteries

Chen

Wang

et al. 2020

Front. Energy Res.

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Ni-rich layered transition-metal oxides with high specific capacity and energy density are regarded as one of the most promising cathode materials for next generation lithium-ion batteries. However, the notorious surface impurities and high air sensitivity of Ni-rich layered oxides remain great challenges for its large-scale application. In this respect, surface impurities are mainly derived from excessive Li addition to reduce the Li/Ni mixing degree and to compensate for the Li volatilization during sintering. Owing to the high sensitivity to moisture and CO2 in ambient air, the Ni-rich layered oxides are prone to form residual lithium compounds (e.g. LiOH and Li2CO3) on the surface, subsequently engendering the detrimental subsurface phase transformation. Consequently, Ni-rich layered oxides often have inferior storage and processing performance. More seriously, the residual lithium compounds increase the cell polarization, as well as aggravate battery swelling during long-term cycling. This review focuses on the origin and evolution of residual lithium compounds. Moreover, the negative effects of residual lithium compounds on storage performance, processing performance and electrochemical performance are discussed in detail. Finally, the feasible solutions and future prospects on how to reduce or even eliminate residual lithium compounds are proposed.

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“…Since excess lithium precursor is needed to suppress Li + /Ni 2+ cation mixing during the NCM preparation process, it is difficult to avoid the formation of residual lithium compounds when the surface Li + cations are exposed to air containing moisture and CO 2 [10][11][12]. In order to reduce surface residual lithium compounds of NCM materials, washing with water is a widely used method in industrial manufacturing.…”

Section: Introductionmentioning

confidence: 99%

Reduction of Surface Residual Lithium Compounds for Single-Crystal LiNi0.6Mn0.2Co0.2O2 via Al2O3 Atomic Layer Deposition and Post-Annealing

Xiang

et al. 2022

Coatings

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Surface residual lithium compounds of Ni-rich cathodes are tremendous obstacles to electrochemical performance due to blocking ion/electron transfer and arousing surface instability. Herein, ultrathin and uniform Al2O3 coating via atomic layer deposition (ALD) coupled with the post-annealing process is reported to reduce residual lithium compounds on single-crystal LiNi0.6Mn0.2Co0.2O2 (NCM622). Surface composition characterizations indicate that LiOH is obviously reduced after Al2O3 growth on NCM622. Subsequent post-annealing treatment causes the consumption of Li2CO3 along with the diffusion of Al atoms into the surface layer of NCM622. The NCM622 modified by Al2O3 coating and post-annealing exhibits excellent cycling stability, the capacity retention of which reaches 92.2% after 300 cycles at 1 C, much higher than that of pristine NCM622 (34.8%). Reduced residual lithium compounds on NCM622 can greatly decrease the formation of LiF and the degree of Li+/Ni2+ cation mixing after discharge–charge cycling, which is the key to the improvement of cycling stability.

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High reactivity of the nickel-rich LiNi1-x-yMnxCoyO2 layered materials surface towards H2O/CO2 atmosphere and LiPF6-based electrolyte

Cited by 84 publications

References 39 publications

On-Line Thermally Induced Evolved Gas Analysis: An Update—Part 1: EGA-MS

On-Line Thermally Induced Evolved Gas Analysis: An Update—Part 1: EGA-MS

The Formation, Detriment and Solution of Residual Lithium Compounds on Ni-Rich Layered Oxides in Lithium-Ion Batteries

Reduction of Surface Residual Lithium Compounds for Single-Crystal LiNi0.6Mn0.2Co0.2O2 via Al2O3 Atomic Layer Deposition and Post-Annealing

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