The surface double-coupling on single-crystal LiNi0.8Co0.1Mn0.1O2 for inhibiting the formation of intragranular cracks and oxygen vacancies

Liu, Yunjian; Zeng, Tianyi; Li, Guotai; Wan, Tao; Li, Mengyao; Zhang, Xiaoyun; Li, Meiqing; Su, Mingru; Dou, Aichun; Zeng, Wensai; Zhou, Yu; Guo, Ruiqiang; Chu, Dewei

doi:10.1016/j.ensm.2022.08.026

Cited by 118 publications

(52 citation statements)

References 62 publications

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“…A similar phenomenon occurs on both the (104) and (003) peaks of NCM622-La@LLO [Figure 1B and C]. Additionally, the interplanar spacings of ( 003) and (104) widen, owing to the introduction of La, which is plausibly conducive to facilitating the ionic diffusion kinetics of Li ions [52,53] . Moreover, the weak diffraction peaks of (020), ( 111) and (220) observed in NCM622-La@LLO are attributed to the LiLaO 2 surface coating layer [Supplementary Figure 1].…”

Section: Resultsmentioning

confidence: 53%

Enabling 4.6 V LiNi0.6Co0.2Mn0.2O2 cathodes with excellent structural stability: combining surface LiLaO2 self-assembly and subsurface La-pillar engineering

Yu¹,

Tong²,

Chen³

et al. 2022

Energy Mater

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Although Ni-rich layered materials with the general formula LiNi1-x-yCoxMnyO2 (0 < x, y < 1, NCM) hold great promise as high-energy-density cathodes in commercial lithium-ion batteries, their practical application is greatly hampered by poor cyclability and safety. Herein, a LiNi0.6Co0.2Mn0.2O2 (NCM622) cathode modified with a surface self-assembling LiLaO2 coating and subsurface La pillars demonstrates stabilized cycling at 4.6 V. The LiLaO2-coated NCM622 benefits from the suppression of interfacial side reactions, which relieves the layer-to-rock salt phase transformation and therefore improves the capacity retention under high voltages. Moreover, the La dopant, as a pillar in the NCM622 lattice, plays a dual role in expanding the c lattice parameter to enhance the Li-ion diffusion capability, as well as suppressing Ni antisite defect formation upon cycling. Consequently, the dual-modified NCM622 cathode exhibits an initial Coulombic efficiency of over 85% and a high capacity of over 200 mAh g-1 at 0.1 C. A specific capacity of 188 mAh g-1 with a capacity retention of 76% is achieved at 1 C after 200 cycles within a voltage range of 3.0-4.6 V. These findings lay a solid foundation for the materials design and performance optimization of high-energy-density cathodes for Li-ion batteries.

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Section: Resultsmentioning

confidence: 53%

Enabling 4.6 V LiNi0.6Co0.2Mn0.2O2 cathodes with excellent structural stability: combining surface LiLaO2 self-assembly and subsurface La-pillar engineering

Yu¹,

Tong²,

Chen³

et al. 2022

Energy Mater

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“…In practice, the energy efficiency should be as high as possible, which is calculated by the integral equation in the charge/discharge process . At 0.1C, both NSC@SiO 2 /S and NSPC@SiO 2 /S exhibit satisfactory energy efficiency over 90% (Figure d).…”

Section: Results and Discussionmentioning

confidence: 99%

Regeneration of Activated Sludge into SiO₂-Decorated Heteroatom-Doped Porous Carbon as Advanced Electrodes for Li–S Batteries

Yang

Jia

Sun

et al. 2023

ACS Appl. Mater. Interfaces

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The regeneration of harmful activated sludge into an energy source is an important strategy for municipal sludge treatment and recycling. Herein, SiO2-modified N,S auto-doped porous carbon (NSC@SiO2) with high conductivity (70 S m–1) is successfully obtained through a simple calcination method of the activated sludge from wastewater treatment. Further, P-doped NSC@SiO2 (NSPC@SiO2) is designed to achieve a higher surface area (891 m2 g–1 vs 624 m2 g–1), a larger pore volume (0.87 cm3 g–1 vs 0.08 cm3 g–1), and more carbon defects. Due to its special structure, NSPC@SiO2 is used as a sulfur host of lithium–sulfur batteries. The results of polysulfide adsorption experiments, S 2p X-ray photoelectron spectra (XPS), Li2S nucleation experiments, polysulfide symmetric cells, measurement of the galvanostatic intermittent titration (GITT), polarization voltage difference, lithium-ion diffusion rate, and Tafel slope verified that NSPC@SiO2 greatly improved the adsorption capacity of polysulfides, lowered the barrier to Li2S formation and the internal resistances of cells, and accelerated Li+ ion diffusion and the reaction kinetics of polysulfide conversion, resulting in the excellent performance of polysulfide capture and superior rate performance and cyclic stability. By comparing NSPC@SiO2 with NSC@SiO2, a higher initial capacity (1377 mAh g–1 vs 1150 mAh g–1 at 0.1C), better rate capacity (912 mAh g–1 vs 719 mAh g–1 at 2C), and low capacity decay (0.094% per cycle within 200 cycles) are obtained. Our work provides direction for the treatment, disposal, and resource utilization of activated sludge.

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“…The TGA results for the pristine LNMO and coated LNMO particles are depicted in Figure 1a. The samples were heated from 35 to 850 °C at a rate of 5 °C/min under a nitrogen atmosphere. The bare LNMO particles had a weight loss of ∼0.5% at temperatures up to 100 °C, whereas the LZ25-and LZ50-coated LNMO particles had a weight change of 0.43 and 0.35%, respectively, over the same temperature range.…”

Section: Thermal Properties Of Coated Cathode Particlesmentioning

confidence: 99%

“…32,33 Another advantage of applying both a coating and a dopant is the inhibition of the formation of intergranular cracks, growth of the solid electrolyte interphase (SEI) layer, and creation of oxygen vacancies. 34,35 Other classes of coating materials that have been shown to improve the electrochemical performance of cathode materials are lithium perovskites and other lithium rich coatings. One reason for this improvement is the ability of these materials to support the tunneling of lithium ions during their migration, in response to the charge and discharge processes.…”

Section: Introductionmentioning

confidence: 99%

“…The thickness of these layers could be tailored up to 2.9 Å. To address these limitations while still utilizing the properties afforded by oxide materials and enhancing the ability to further tune the properties of these coatings, on-going efforts seek to prepare composite coatings that contain a mixture of two materials (e.g., “dual coating” materials). − Researchers have also focused their attention on modifying their materials by both applying a coating and incorporating dopants, as well as investigating the effect of doping at the lithium site. , Another advantage of applying both a coating and a dopant is the inhibition of the formation of intergranular cracks, growth of the solid electrolyte interphase (SEI) layer, and creation of oxygen vacancies. , …”

Section: Introductionmentioning

confidence: 99%

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Unraveling the Role of Composite Li₃PO₄/ZrO₂ Coatings Prepared by Dry Milling on High Voltage Spinel Cathodes for Lithium-Ion Batteries: Insights into Lattice Strain, Thermal Behavior, Material Compatibility, and Electrochemical Performance

Kaur

Nesvaderani²,

Hadidi³

et al. 2022

ACS Appl. Energy Mater.

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In the present investigation, three composite coatings for high voltage spinels were prepared from Li3PO4:ZrO2 (with varying loadings of zirconia, ZrO2, and lithium phosphate, Li3PO4) using ball milling techniques. The coatings were prepared on high voltage spinel LNMO (LiNi0.5Mn1.5O4) using mechanical mixing, and the samples were heated at 600 °C to achieve a uniform, crystalline coating. A coating referred to as LZ75 (75 wt % zirconia and 25 wt % Li3PO4) exhibited the highest relative weight stability and a lower heat of reaction than other ratios of ZrO2 and Li3PO4 prepared for these custom coatings on LNMO. X-ray photoelectron spectroscopy indicated the presence of zirconia and phosphorous on the LNMO surfaces. Band gap studies indicated a decrease in the direct and indirect band gaps for the coatings with a higher ZrO2 content, which could enhance conductivity in the material. In contrast to this, the Urbach energy (E u) yielded a reverse trend and followed the order (LNMO) < (LZ25-coated LNMO) < (LZ50-coated LNMO) < (LZ75-coated LNMO). Electron microscopy studies indicated a change in morphology for the coated LNMO, especially for the LZ75-coated LNMO. Additional studies evaluated bare and coated LNMO for their stability in the presence of LiPF6 electrolyte. Scanning electron microscopy and X-ray diffraction analyses of the LNMO/LiPF6 interfaces for the coated and bare cathode materials indicated that the coating tends to suppress Mn dissolution in comparison to the uncoated LNMO. Additionally, more phases were seen in the LNMO/LiPF6 interface than for the coated LNMO materials. Electrochemical performance depicted an enhanced capacity retention of up to 88.5% for the LZ75-coated LNMO, compared to 69.2% for pristine LNMO after 100 cycles at 1 C (3–5 V vs Li/Li+). The lithium-ion diffusion coefficient (D Li+ ) also exhibited a significant increase in the coated cathodes along with a decrease in the charge transfer resistance and surface film resistance.

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The surface double-coupling on single-crystal LiNi0.8Co0.1Mn0.1O2 for inhibiting the formation of intragranular cracks and oxygen vacancies

Cited by 118 publications

References 62 publications

Enabling 4.6 V LiNi0.6Co0.2Mn0.2O2 cathodes with excellent structural stability: combining surface LiLaO2 self-assembly and subsurface La-pillar engineering

Enabling 4.6 V LiNi0.6Co0.2Mn0.2O2 cathodes with excellent structural stability: combining surface LiLaO2 self-assembly and subsurface La-pillar engineering

Regeneration of Activated Sludge into SiO₂-Decorated Heteroatom-Doped Porous Carbon as Advanced Electrodes for Li–S Batteries

Unraveling the Role of Composite Li₃PO₄/ZrO₂ Coatings Prepared by Dry Milling on High Voltage Spinel Cathodes for Lithium-Ion Batteries: Insights into Lattice Strain, Thermal Behavior, Material Compatibility, and Electrochemical Performance

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The surface double-coupling on single-crystal LiNi0.8Co0.1Mn0.1O2 for inhibiting the formation of intragranular cracks and oxygen vacancies

Cited by 118 publications

References 62 publications

Enabling 4.6 V LiNi0.6Co0.2Mn0.2O2 cathodes with excellent structural stability: combining surface LiLaO2 self-assembly and subsurface La-pillar engineering

Enabling 4.6 V LiNi0.6Co0.2Mn0.2O2 cathodes with excellent structural stability: combining surface LiLaO2 self-assembly and subsurface La-pillar engineering

Regeneration of Activated Sludge into SiO2-Decorated Heteroatom-Doped Porous Carbon as Advanced Electrodes for Li–S Batteries

Unraveling the Role of Composite Li3PO4/ZrO2 Coatings Prepared by Dry Milling on High Voltage Spinel Cathodes for Lithium-Ion Batteries: Insights into Lattice Strain, Thermal Behavior, Material Compatibility, and Electrochemical Performance

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Product

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About

Regeneration of Activated Sludge into SiO₂-Decorated Heteroatom-Doped Porous Carbon as Advanced Electrodes for Li–S Batteries

Unraveling the Role of Composite Li₃PO₄/ZrO₂ Coatings Prepared by Dry Milling on High Voltage Spinel Cathodes for Lithium-Ion Batteries: Insights into Lattice Strain, Thermal Behavior, Material Compatibility, and Electrochemical Performance