An Mg–Al dual doping strategy to enhance the structural stability and long cycle life of LiNi0.8Co0.1Mn0.1O2 cathode material

Xiao, Li; Tang, Xincun; Ban, Zheng; Tang, Zanlang; Liu, Haonan; Liu, Chen; Lou, Yongshan

doi:10.1007/s11581-022-04572-w

Cited by 12 publications

(8 citation statements)

References 43 publications

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“…A Ni 2p 3/2 peak with a satellite peak is observed for both cathodes before the cycle test. After the cycle test, the Ni 2p 3/2 peak is split into two peaks corresponding to Ni 3+ and Ni 2+ at 855.7 and 857.5 eV, respectively . The decreased Ni 2+ peak indicates that the disorder tendency of Li + /Ni 2+ is diminished and a layered structure is established in the cathode.…”

Section: Resultsmentioning

confidence: 99%

“…After the cycle test, the Ni 2p 3/2 peak is split into two peaks corresponding to Ni 3+ and Ni 2+ at 855.7 and 857.5 eV, respectively. 32 The decreased Ni 2+ peak indicates that the disorder tendency of Li + /Ni 2+ is diminished and a layered structure is established in the cathode. In the case of PANi@NCM, the Ni 2+ peak is dramatically decreased after the cycle test, indicating that the layered structure is well maintained.…”

Section: Resultsmentioning

confidence: 99%

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Fundamental Understanding of the Effect of a Polyaniline Coating Layer on Cation Mixing and Chemical States of LiNi_0.9Co_0.085Mn_0.015O₂ for Li-Ion Batteries

Yoon

Shin

Park

2023

ACS Appl. Polym. Mater.

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A high nickel content of the cathode usually results in a large discharge capacity but causes structural collapse. Ni 2+ ions move to the Li layer when Li + ions are deintercalated during discharge, resulting in irreversible phase transition, cation mixing, dissolution of transition metal ions, and side reactions. A protective barrier is essential for maintaining the layered structures of cathode materials, even after several charge/discharge cycles of Li-ion batteries. Polyaniline (PANi) is an organic coating material with high conductivity and flexibility. PANi-coated cathodes have been widely reported for improving electrochemical performances. However, it is insufficient to prove the correlation between the PANi coating layer and structural stability through further analysis after an electrochemical test. Therefore, we focused on the structural stability and chemical states of the PANi-coated cathode after a cycle test by observing the morphology, lattice patterns, and chemical states of the surface. PANi-coated LiNi 0.9 Co 0.085 Mn 0.015 O 2 (NCM; PANi@NCM) exhibited an initial discharge capacity of 221 mAh g −1 and a capacity retention of 81% after 50 cycles at 45 °C, which corresponded to an improved performance compared to pristine NCM. The cycled PANi@NCM showed an identical morphology to that of the cathode before the test. The R3̅ m layered structure of PANi@NCM was maintained even after 50 cycles, as confirmed by transmission electron microscopy analysis with fast Fourier transform patterns and high-angle annular dark-field images. In addition, PANi@NCM maintains a thinner passivation layer (8 nm) compared with that of pristine NCM (27 nm). According to the X-ray photoelectron spectroscopy results, the surface chemical state of PANi@NCM showed that side reactions between the cathode and the electrolyte were suppressed during the cycle test. Therefore, it is demonstrated that the PANi coating layer prevents cation mixing and side reactions.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Fundamental Understanding of the Effect of a Polyaniline Coating Layer on Cation Mixing and Chemical States of LiNi_0.9Co_0.085Mn_0.015O₂ for Li-Ion Batteries

Yoon

Shin

Park

2023

ACS Appl. Polym. Mater.

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“…In the Ni 2 p spectra, the Ni 2 p 3/2 regime at ≈856 eV is deconvoluted into two distinct valence states of Ni; Ni 2+ and Ni 3+ located at 854.7 and 857.5 eV, respectively. [ 70 ] The PNCI333 cathode exhibited a significantly lower Ni 2+ /Ni 3+ ratio compared to the PVDF cathode, indicating that cation mixing between Li + and Ni 2+ was effectively inhibited in the PNCI333 cathode. [ 69,70 ] This inhibition is particularly beneficial for preserving the layered NCM structure, contributing to improved cycling performance.…”

Section: Resultsmentioning

confidence: 99%

“…[ 70 ] The PNCI333 cathode exhibited a significantly lower Ni 2+ /Ni 3+ ratio compared to the PVDF cathode, indicating that cation mixing between Li + and Ni 2+ was effectively inhibited in the PNCI333 cathode. [ 69,70 ] This inhibition is particularly beneficial for preserving the layered NCM structure, contributing to improved cycling performance.…”

Section: Resultsmentioning

confidence: 99%

Striking a Balance: Exploring Optimal Functionalities and Composition of Highly Adhesive and Dispersing Binders for High‐Nickel Cathodes in Lithium‐Ion Batteries

Jeong,

Kwon,

Kim

et al. 2023

Advanced Energy Materials

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Nickel‐rich layered oxide, LiNixCoyMnzO2 (NCM, x > 0.8), has emerged as a promising cathode material for lithium‐ion batteries due to its high specific capacity and energy density. However, there remains a challenge regarding NCM degradation during cycling, associated with interfacial side reactions and microcrack formation. Herein, a functional poly(norbornene‐co‐norbornene dicarboxylic acid‐co‐heptafluorobutyl norbornene imide) (PNCI)‐based binder system is introduced, with controlled functionalities and monomer compositions, to preserve the structural integrity of NCM. The PNCI binder system incorporates three different norbornene‐derived monomers with distinct functionalities, allowing for multifunctionality, including electro‐chemo‐mechanical stability, strong adhesion, and dispersibility. By systematically adjusting the molar composition of the PNCI binders, the overall binder characteristics are fine‐tuned, optimizing the adhesion and dispersion of electrode components. The optimized PNCI binder, with desired adhesion strength, surface energy, and polarity, plays a crucial role in facilitating the formation of a uniform electrode structure with a high areal mass loading of NCM, ensuring long‐term cycling stability. This study highlights the significance of striking a balance between functionalities and composition in binder systems to achieve high‐performance NCM cathodes.

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“…Multi-ion co-doping is the use of multiple ions for modification, which can combine the advantages of multiple ions and maximize the comprehensive electrochemical performance of the material. For example, PO4 3-/Mn 4+ [40], P 3-/F - [41,42], Mg 2+ /Al 3+ [43,44], Al 3+ /Fe 3+ [45], Mg 2+ /F - [46], Na + /F - [47].…”

Section: Multi-ion Co-dopingmentioning

confidence: 99%

Research Progress on Doping and Coating of High-Nickel Cathode Materials for Lithium-Ion Batteries

Lv,

Ye,

Zhang

et al. 2023

Preprint

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Cathode materials play a key role in the development and application of lithium-ion batteries, but the unfavorable factors such as structural phase transformation and low conductivity in the cycling process restrict the further improvement of battery performance, so the development and modification of high-performance cathode materials is a current research hotspot. LiNixCoyMn1-x-yO2(x≥0.6), a high-nickel cathode material, has the advantages of high platform potential, high energy density and low cost, and is an ideal material to achieve the goal of 300 Wh kg-1 and above for batteries. However, its poor thermal stability, poor interface stability, safety and life cannot meet the requirements of current power batteries. In this paper, the research status of high-nickel cathode materials is introduced, including bulk doping and surface coating, and the modification method of doping and coating integration is also introduced. Finally, we put forward the prospect of the future development trend of high-nickel cathode materials.

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An Mg–Al dual doping strategy to enhance the structural stability and long cycle life of LiNi0.8Co0.1Mn0.1O2 cathode material

Cited by 12 publications

References 43 publications

Fundamental Understanding of the Effect of a Polyaniline Coating Layer on Cation Mixing and Chemical States of LiNi_0.9Co_0.085Mn_0.015O₂ for Li-Ion Batteries

Fundamental Understanding of the Effect of a Polyaniline Coating Layer on Cation Mixing and Chemical States of LiNi_0.9Co_0.085Mn_0.015O₂ for Li-Ion Batteries

Striking a Balance: Exploring Optimal Functionalities and Composition of Highly Adhesive and Dispersing Binders for High‐Nickel Cathodes in Lithium‐Ion Batteries

Research Progress on Doping and Coating of High-Nickel Cathode Materials for Lithium-Ion Batteries

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An Mg–Al dual doping strategy to enhance the structural stability and long cycle life of LiNi0.8Co0.1Mn0.1O2 cathode material

Cited by 12 publications

References 43 publications

Fundamental Understanding of the Effect of a Polyaniline Coating Layer on Cation Mixing and Chemical States of LiNi0.9Co0.085Mn0.015O2 for Li-Ion Batteries

Fundamental Understanding of the Effect of a Polyaniline Coating Layer on Cation Mixing and Chemical States of LiNi0.9Co0.085Mn0.015O2 for Li-Ion Batteries

Striking a Balance: Exploring Optimal Functionalities and Composition of Highly Adhesive and Dispersing Binders for High‐Nickel Cathodes in Lithium‐Ion Batteries

Research Progress on Doping and Coating of High-Nickel Cathode Materials for Lithium-Ion Batteries

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Fundamental Understanding of the Effect of a Polyaniline Coating Layer on Cation Mixing and Chemical States of LiNi_0.9Co_0.085Mn_0.015O₂ for Li-Ion Batteries

Fundamental Understanding of the Effect of a Polyaniline Coating Layer on Cation Mixing and Chemical States of LiNi_0.9Co_0.085Mn_0.015O₂ for Li-Ion Batteries