Improvement of the electrochemical performance of a nickel rich LiNi0.5Co0.2Mn0.3O2 cathode material by reduced graphene oxide/SiO2 nanoparticle double-layer coating

Khollari, Mohammad Amin Razmjoo; Paknahad, Pouyan; Ghorbanzadeh, Milad

doi:10.1039/c8nj05835k

Cited by 34 publications

(13 citation statements)

References 53 publications

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“…FTIR spectra for the PMMA, PVDF, SC-NCM, SC-NCM/PMMA, SC-NCM/PVDF, and SC-NCM/(PMMA+PVDF) are compared in Figures and S2b. For the pristine SC-NCM, the peaks arising from the metal oxide (500 cm –1 ) and lithium carbonate (875, 1400 cm –1 ) are observed. , The weak tertiary alcohol peaks (1049 cm –1 ) and carbonyl ketoyl peaks (1623 cm –1 ) are believed to be related to the formation of diacetonealcohol after treatment in an acetone environment . After application of the PMMA nanolayer, the peaks relating to the metal oxide (500 cm –1 ) and lithium carbonate are simultaneously decreased.…”

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confidence: 96%

Anchoring Interfacial Nickel Cations on Single-Crystal LiNi_0.8Co_0.1Mn_0.1O₂ Cathode Surface via Controllable Electron Transfer

et al. 2020

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Severe Ni dissolution and the resulting impedance rise for the single-crystal LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode is the main challenge greatly hindering its industrial applications. Herein, we propose a novel concept of anchoring interfacial nickel cations on a single-crystal LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode through controllable electron transfer. This strategy is realized by applying an ultrathin PMMA surface layer. Different from traditional physical coatings, electron transfer from Ni 2+ to the ester group is confirmed, which contributes to anchoring the interfacial Ni cations and effectively inhibits Ni dissolution into the organic electrolyte. Meanwhile, Li diffusion on the cathode surface is significantly improved. As a result, the electrochemical performance of the LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode with a PMMA layer is improved. A reversible capacity of 181.1 mAh g −1 at 1C rate is obtained with enhanced rate capability and cycling stability. Moreover, the modified LiNi 0.8 Co 0.1 Mn 0.1 O 2 is able to work well at high voltage and high temperature, especially with incorporation of polyvinylidene fluoride.

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confidence: 96%

Anchoring Interfacial Nickel Cations on Single-Crystal LiNi_0.8Co_0.1Mn_0.1O₂ Cathode Surface via Controllable Electron Transfer

et al. 2020

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“…The fantastic stability of the Se‐NCM sample during cycling indicates that the Li 2 SeO 4 coating is advantageous for Li‐ion transmission, effectively alleviating adverse reactions and reducing electrochemical polarisation on the surface of Se‐NCM samples [38] …”

Section: Resultsmentioning

confidence: 99%

Sublimated Se‐Induced Formation of Dual‐Conductive Surface Layers for High‐Performance Ni‐Rich Layered Cathodes

et al. 2021

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Ni‐rich layered oxide cathode materials for Li‐ion batteries have received widespread attention owing to their high specific capacity and comparatively low cost. However, owing to Li‐containing surface residues, side reactions with the electrolyte and structural rearrangement after long‐term cycling leads to severe degradation of the cathode performance. Here, Se coating serves as a novel and simple sublimation‐inducing gas reaction method to modify the Ni‐rich layered material, resulting in capacity retention and rate performance improvement. The sublimed gaseous Se reacts with residual Li compounds to form a Li2SeO4 coating on the surface of the secondary particles, which simultaneously promotes the transmission of Li ions and reduces electrode‐electrolyte side reactions. Moreover, gaseous Se penetrates between the primary particles within the secondary particles to promote electron transmission. This dual‐conductive surface layer facilitates superior capacity and voltage retentions. Significantly, the proposed method is scalable and applicable to all Ni‐rich cathode materials.

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“…Two peaks at about 1368 and 1590 cm −1 were also detected in Figure 4b, which can be assigned to the D and G bands of graphene for the existence of super P conductive additive. [ 42–44 ]…”

Section: Resultsmentioning

confidence: 99%

Enhanced Electrochemical Performance of LiNi_0.6Co_0.2Mn_0.2O₂ by a Negative‐Thermal‐Expansion Material at Elevated Temperature

Jing

Hao

et al. 2021

Energy Tech

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More measures are being developed to enhance the electrochemical stability of single‐crystal LiNi0.6Co0.2Mn0.2O2 (NCM622), but few focus on improving the stability of NCM622 through heat and deformation management. Herein, a negative‐thermal‐expansion (NTE) material of zirconium tungstate ZrW2O8 is adopted to modify NCM622 via a facile method, and the sample with a proper content of ZrW2O8 exhibits superior cycle performance and rate capability. The capacity retention ratio of modified NCM622 is 86.2% (from 193.6 to 166.8 mAh g−1) after 100 cycles at 2 C between 2.8 and 4.5 V at 60 °C, whereas that of the pristine NCM622 is only 77.5% (from 183.8 to 142.4 mAh g−1). According to various analysis results, the possible enhancing mechanisms of ZrW2O8 for NCM622 are discussed. It is an alternative for the remaining good structure of energy materials using NTE materials.

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Improvement of the electrochemical performance of a nickel rich LiNi_0.5Co_0.2Mn_0.3O₂ cathode material by reduced graphene oxide/SiO₂ nanoparticle double-layer coating

Abstract: Improvement of the electrochemical properties of a LiNi0.5Co0.2Mn0.3O2 cathode material by SiO2/reduced graphene oxide double-layer coating.

Cited by 34 publications

References 53 publications

Anchoring Interfacial Nickel Cations on Single-Crystal LiNi_0.8Co_0.1Mn_0.1O₂ Cathode Surface via Controllable Electron Transfer

Anchoring Interfacial Nickel Cations on Single-Crystal LiNi_0.8Co_0.1Mn_0.1O₂ Cathode Surface via Controllable Electron Transfer

Sublimated Se‐Induced Formation of Dual‐Conductive Surface Layers for High‐Performance Ni‐Rich Layered Cathodes

Enhanced Electrochemical Performance of LiNi_0.6Co_0.2Mn_0.2O₂ by a Negative‐Thermal‐Expansion Material at Elevated Temperature

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Improvement of the electrochemical performance of a nickel rich LiNi0.5Co0.2Mn0.3O2 cathode material by reduced graphene oxide/SiO2 nanoparticle double-layer coating

Abstract: Improvement of the electrochemical properties of a LiNi0.5Co0.2Mn0.3O2 cathode material by SiO2/reduced graphene oxide double-layer coating.

Cited by 34 publications

References 53 publications

Anchoring Interfacial Nickel Cations on Single-Crystal LiNi0.8Co0.1Mn0.1O2 Cathode Surface via Controllable Electron Transfer

Anchoring Interfacial Nickel Cations on Single-Crystal LiNi0.8Co0.1Mn0.1O2 Cathode Surface via Controllable Electron Transfer

Sublimated Se‐Induced Formation of Dual‐Conductive Surface Layers for High‐Performance Ni‐Rich Layered Cathodes

Enhanced Electrochemical Performance of LiNi0.6Co0.2Mn0.2O2 by a Negative‐Thermal‐Expansion Material at Elevated Temperature

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Improvement of the electrochemical performance of a nickel rich LiNi_0.5Co_0.2Mn_0.3O₂ cathode material by reduced graphene oxide/SiO₂ nanoparticle double-layer coating

Anchoring Interfacial Nickel Cations on Single-Crystal LiNi_0.8Co_0.1Mn_0.1O₂ Cathode Surface via Controllable Electron Transfer

Anchoring Interfacial Nickel Cations on Single-Crystal LiNi_0.8Co_0.1Mn_0.1O₂ Cathode Surface via Controllable Electron Transfer

Enhanced Electrochemical Performance of LiNi_0.6Co_0.2Mn_0.2O₂ by a Negative‐Thermal‐Expansion Material at Elevated Temperature