Solution combustion synthesis and enhanced electrochemical performance Li1.2Ni0.2Mn0.6O2 nanoparticles by controlling NO3–/CH3COO– ratio of the precursors

Zhang, Qingtang; Mei, Juntao; Xie, Xu; Wang, Xiaomei; Zhang, Junyan

doi:10.1016/j.materresbull.2015.05.005

Cited by 13 publications

(4 citation statements)

References 47 publications

(64 reference statements)

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“…The slope of two linear equations (the value of the

σ

) are 185.5 J s 1/2 C −2 and 388.46 J s 1/2 C −2 for the cathode material before cycles and after 40 cycles. The Li + diffusion coefficients of before cycle (33.4×10 −17 cm 2 s −1 ) and after 40 cycles (7.62×10 −17 cm 2 s −1 ) are calculated based on the information mentioned above as shown on Table , which indicate the increase of resistance too ,. The EIS results indicate the distinguished intercalating/deintercalating rate of lithium ions, cyclic stability and rate capability.…”

Section: Resultsmentioning

confidence: 99%

Multistage Li_1.2Ni_0.2Mn_0.6O₂ Micro‐architecture towards High‐Performance Cathode Materials for Lithium‐Ion Batteries

Zheng

et al. 2017

ChemElectroChem

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Constructing hierarchical‐architecture primary nanoparticles that assemble with secondary micro‐architectures is very effective to achieve high‐performance cathode materials for lithium‐ion batteries (LIBs). In this work, well‐crystallized lithium‐rich layered oxide cathode materials Li1.2Ni0.2Mn0.6O2 (LNMO) with a micro‐architecture was successfully synthesized. The preparation process is divided into two steps: the solvothermal process synthesizes the precursor Ni0.25Mn0.75CO3 (NMCO) and gradient temperature calcination is used to prepare the primary nanoparticles that agglomerate into hierarchical microspheres for final‐product LNMO. The as‐prepared material was used as cathode materials for LIBs, which exhibit good cycle life and excellent rate performances. The material retains a fairly high discharge capacity of approximately 180 mAh g−1 after 180 cycles at the 2C rate (1C=200 mA g−1). Even after a 50‐fold (5C/0.1C) increase, a discharge capacity 61.4 % (153.8 mAh g−1) of the capacity at 0.1C (ca. 249.1 mAh g−1) could be retained. This superior cycle life and rate performance are attributed to the merits of the hierarchical nano‐/microsphere structures.

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“…The slope of two linear equations (the value of the

σ

Section: Resultsmentioning

confidence: 99%

Multistage Li_1.2Ni_0.2Mn_0.6O₂ Micro‐architecture towards High‐Performance Cathode Materials for Lithium‐Ion Batteries

Zheng

et al. 2017

ChemElectroChem

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“…Altering the precursor metal salts and the ratio of the fuel to oxidants in the starting solution can significantly alter the combustion properties and tune the size and morphology of the resultant nanoparticles. 13,14,15,16,17 For example, LiMn2O4 particles prepared with varying ratios of NO3 -/CH3COOprecursor salts produce significantly different nanocrystallite sizes. When used as Li-ion battery cathode materials, samples obtained with the optimal 3:2 ratio of NO3 -/CH3COOsalts demonstrated the best rate capability, highest charge-discharge capacity and lowest voltage hysteresis owing to their smallest nanocrystallites and primary particle sizes.…”

Section: Introductionmentioning

confidence: 99%

Unravelling the role of particle size and nanostructuring on the oxygen evolution activity of Fe-doped NiO

Rao,

Bucci,

Corby

et al. 2024

Preprint

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Nickel-based oxides and oxyhydroxide catalysts exhibit state-of-the-art activity for the sluggish oxygen evolution reaction (OER) in alkaline conditions. A widely employed strategy to increase the gravimetric activity of the catalyst is to increase the active surface area via nanostructuring or decreasing the particle size. However, fundamental understanding about how tuning these parameters influences the density of oxidized species and their reaction kinetics remains unclear. Here, we use solution combustion synthesis, a low-cost and scalable approach, to synthesize a series of Fe0.1Ni0.9O samples from different precursor salts. Based on the precursor salt, the nanoparticle size can be changed significantly from ~2.5 nm to ~37 nm. The OER activity in pH 13 trends inversely with the particle size. Using operando, time-resolved optical spectroscopy, we quantify the density of oxidized species as a function of potential and demonstrate that the OER kinetics exhibits a second order dependence on the density of these species, suggesting that the OER mechanism relies on O-O coupling between neighbouring oxidized species. With decreasing particle size, the density of species accumulated is found to increase, with a decrease in their intrinsic reactivity for OER, attributed to a stronger binding of *O species (i.e. a cathodic shift of species energetics). This signifies that the high apparent OER activity per geometric area of the smaller nanoparticles is driven by their ability to accumulate a larger density of oxidized species. This study not only experimentally disentangles the influence of the density of oxidized species and intrinsic kinetics on the overall rate of OER, but also highlights the importance of tuning these parameters independently to develop more active OER catalysts.

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“…The resultant catalysts had a water oxidation activity of 10 mA/cm 2 geometric at an overpotential of 190 mV . Altering the precursor metal salts and the ratio of the fuel to oxidants in the starting solution can significantly alter the combustion properties and tune the size and morphology of the resultant nanoparticles. − For example, LiMn 2 O 4 particles prepared with varying ratios of NO 3 – /CH 3 COO – precursor salts produced significantly different nanocrystallite sizes. When used as Li-ion battery cathode materials, samples obtained with the optimal 3:2 ratio of NO 3 – /CH 3 COO – salts demonstrated the best rate capability, highest charge–discharge capacity, and lowest voltage hysteresis, owing to their smallest nanocrystallites and primary particle sizes .…”

Section: Introductionmentioning

confidence: 99%

Unraveling the Role of Particle Size and Nanostructuring on the Oxygen Evolution Activity of Fe-Doped NiO

Rao,

Bucci,

Corby

et al. 2024

ACS Catal.

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Nickel-based oxides and oxyhydroxide catalysts exhibit state-of-the-art activity for the sluggish oxygen evolution reaction (OER) under alkaline conditions. A widely employed strategy to increase the gravimetric activity of the catalyst is to increase the active surface area via nanostructuring or decrease the particle size. However, the fundamental understanding about how tuning these parameters influences the density of oxidized species and their reaction kinetics remains unclear. Here, we use solution combustion synthesis, a low-cost and scalable approach, to synthesize a series of Fe 0.1 Ni 0.9 O samples from different precursor salts. Based on the precursor salt, the nanoparticle size can be changed significantly from ∼2.5 to ∼37 nm. The OER activity at pH 13 trends inversely with the particle size. Using operando timeresolved optical spectroscopy, we quantify the density of oxidized species as a function of potential and demonstrate that the OER kinetics exhibits a second-order dependence on the density of these species, suggesting that the OER mechanism relies on O−O coupling between neighboring oxidized species. With the decreasing particle size, the density of species accumulated is found to increase, and their intrinsic reactivity for the OER is found to decrease, attributed to the stronger binding of *O species (i.e., a cathodic shift of species energetics). This signifies that the high apparent OER activity per geometric area of the smaller nanoparticles is driven by their ability to accumulate a larger density of oxidized species. This study not only experimentally disentangles the influence of the density of oxidized species and intrinsic kinetics on the overall rate of the OER but also highlights the importance of tuning these parameters independently to develop more active OER catalysts.

show abstract

Solution combustion synthesis and enhanced electrochemical performance Li1.2Ni0.2Mn0.6O2 nanoparticles by controlling NO3–/CH3COO– ratio of the precursors

Cited by 13 publications

References 47 publications

Multistage Li_1.2Ni_0.2Mn_0.6O₂ Micro‐architecture towards High‐Performance Cathode Materials for Lithium‐Ion Batteries

Multistage Li_1.2Ni_0.2Mn_0.6O₂ Micro‐architecture towards High‐Performance Cathode Materials for Lithium‐Ion Batteries

Unravelling the role of particle size and nanostructuring on the oxygen evolution activity of Fe-doped NiO

Unraveling the Role of Particle Size and Nanostructuring on the Oxygen Evolution Activity of Fe-Doped NiO

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Solution combustion synthesis and enhanced electrochemical performance Li1.2Ni0.2Mn0.6O2 nanoparticles by controlling NO3–/CH3COO– ratio of the precursors

Cited by 13 publications

References 47 publications

Multistage Li1.2Ni0.2Mn0.6O2 Micro‐architecture towards High‐Performance Cathode Materials for Lithium‐Ion Batteries

Multistage Li1.2Ni0.2Mn0.6O2 Micro‐architecture towards High‐Performance Cathode Materials for Lithium‐Ion Batteries

Unravelling the role of particle size and nanostructuring on the oxygen evolution activity of Fe-doped NiO

Unraveling the Role of Particle Size and Nanostructuring on the Oxygen Evolution Activity of Fe-Doped NiO

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Multistage Li_1.2Ni_0.2Mn_0.6O₂ Micro‐architecture towards High‐Performance Cathode Materials for Lithium‐Ion Batteries

Multistage Li_1.2Ni_0.2Mn_0.6O₂ Micro‐architecture towards High‐Performance Cathode Materials for Lithium‐Ion Batteries