Facile strategy of NCA cation mixing regulation and its effect on electrochemical performance

Liu, Baosheng; Wang, Zhenbo; Yu, Fu‐Da; Xue, Yongqiang; Wang, Guangjin; Zhang, Yin; Zhou, Yuxiang

doi:10.1039/c6ra20146f

Cited by 27 publications

(24 citation statements)

References 42 publications

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“…The rate capability of O‐LNMO is better than that of A‐LNMO. The capacity of 109.7 mAh g −1 at 10 C, outstanding among those reported on NRLC, is in sharp contrast with 46.0 mAh g −1 for A‐LNMO. Their cycling stabilities at 1 and 5 C for 100 cycles are given in Figure d.…”

Section: Resultscontrasting

confidence: 57%

Origin of Performance Differences of Nickel‐Rich LiNi_0.9Mn_0.1O₂ Cathode Materials Synthesized in Oxygen and Air

et al. 2019

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Surface state and/or bulk structure, which are determined by different synthesis conditions, have a significant effect on the performance of an electrode material. Distinguishing their individual roles in the performance can provide guidance for the synthesis of high‐performance electrode materials. Cobalt‐free and nickel‐rich LiNi0.9Mn0.1O2, a promising cathode material, is synthesized in air and oxygen to show remarkable differences in both surface state and structure using a facile sol–gel method. Li2CO3 formed at the surface during the synthesis in air results in much poorer performance than in oxygen, which can be significantly improved by the effective removal of Li2CO3 through ultrasonic treatments without changing the bulk structure, morphology, and size. The surface state, instead of bulk structure, morphology, and size‐related elements like more severe cationic mixing and larger secondary particles, is predominantly responsible for the performance difference between the samples synthesized in air and oxygen, which is beyond the conventional viewpoints on layered compounds. This study provides a new perspective for exploring novel synthesis approaches of high‐performance cobalt‐free and nickel‐rich layered compounds.

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Section: Resultscontrasting

confidence: 57%

Origin of Performance Differences of Nickel‐Rich LiNi_0.9Mn_0.1O₂ Cathode Materials Synthesized in Oxygen and Air

et al. 2019

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“…The highest D values for P-24 can be ascribed to its lowest degree of Li/Ni cation mixing (Table 2). Li/Ni cation mixing can deteriorate the electrochemical performance of the cathode material because it blocks the Li + transportation channel [39]. It was reported previously that a hydrothermal treatment could decrease the cation mixing of NCM cathode [22].…”

Section: Resultsmentioning

confidence: 99%

Urea-based hydrothermal synthesis of LiNi0.5Co0.2Mn0.3O2 cathode material for Li-ion battery

Shi

Zhang

Fang

et al. 2018

Journal of Power Sources

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LiNi 0.5 Co 0.2 Mn 0.3 O 2 cathode is synthesized by a urea-based hydrothermal method. • The optimum synthesis is achieved with the precursor synthesized at 200°C for 24 h. • P-24 sample has better electrochemical performance than P-12 and P-18 samples. • P-24 sample has high diffusivity and low charge transfer resistance. • P-24 sample has low cation mixing and uniform distribution of transition metal.

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“…In fact, the literature on NCA has generally avoided reporting about LDH in the precursor in detail. Experimental methods in the literature on NCA materials syntheses often omit precursor characterization [25][26][27][28][29][30][31] or use commercially supplied precursors [32][33][34][35]. Where precursor characterization was reported, there was generally very little discussion as to the presence, formation or removal of the LDH phase [16,17,[36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

The Formation of Layered Double Hydroxide Phases in the Coprecipitation Syntheses of [Ni0.80Co0.15](1−x)/0.95Alx(OH)2(anionn−)x/n (x = 0–0.2, n = 1, 2)

Liu

Dahn

2019

ChemEngineering

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This study investigates the synthesis of [Ni0.80Co0.15](1−x)/0.95Alx(OH)2 (x = 0–0.2) materials by coprecipitation to understand the formation of layered double hydroxide (LDH) phases as influenced by Al content and synthesis route. Two routes were compared: the first method dissolved all the metal reagents into one solution before addition into the reaction vessel, while the second dissolved Al into a separate NaOH solution before simultaneous addition of the Ni/Co and Al solutions into the reaction vessel. The synthesized materials were characterized by Scanning Electron Microscopy, X-ray Diffraction, Inductively Coupled Plasma-Optical Emissions Spectroscopy and Thermogravimetric Analysis to understand the formation of LDH phases as influenced by Al content and synthesis method. It was found that as Al content increased, the amount of LDH phase present increased as well. No significant difference in LDH phase presence was observed for the two synthesis methods, but the morphologies of the particles were different. The method containing all the metals in one solution produced small particles, likely due to the continuous nucleation of Al(OH)3 disrupting particle growth. The method containing the separate Al in NaOH solution matched the morphology of the material with no Al, which is known to form desired large spherical particles under continuously stirring tank reactor synthesis conditions.

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Facile strategy of NCA cation mixing regulation and its effect on electrochemical performance

Abstract: The cation mixing of LiNi0.8Co0.15Al0.05O2 materials was regulated by a facile strategy via oxygen flow rate control during sintering, and the effect of cation mixing on the electrochemical performance was investigated by CR2025 coin cells tests.

Cited by 27 publications

References 42 publications

Origin of Performance Differences of Nickel‐Rich LiNi_0.9Mn_0.1O₂ Cathode Materials Synthesized in Oxygen and Air

Origin of Performance Differences of Nickel‐Rich LiNi_0.9Mn_0.1O₂ Cathode Materials Synthesized in Oxygen and Air

Urea-based hydrothermal synthesis of LiNi0.5Co0.2Mn0.3O2 cathode material for Li-ion battery

The Formation of Layered Double Hydroxide Phases in the Coprecipitation Syntheses of [Ni0.80Co0.15](1−x)/0.95Alx(OH)2(anionn−)x/n (x = 0–0.2, n = 1, 2)

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Facile strategy of NCA cation mixing regulation and its effect on electrochemical performance

Abstract: The cation mixing of LiNi0.8Co0.15Al0.05O2 materials was regulated by a facile strategy via oxygen flow rate control during sintering, and the effect of cation mixing on the electrochemical performance was investigated by CR2025 coin cells tests.

Cited by 27 publications

References 42 publications

Origin of Performance Differences of Nickel‐Rich LiNi0.9Mn0.1O2 Cathode Materials Synthesized in Oxygen and Air

Origin of Performance Differences of Nickel‐Rich LiNi0.9Mn0.1O2 Cathode Materials Synthesized in Oxygen and Air

Urea-based hydrothermal synthesis of LiNi0.5Co0.2Mn0.3O2 cathode material for Li-ion battery

The Formation of Layered Double Hydroxide Phases in the Coprecipitation Syntheses of [Ni0.80Co0.15](1−x)/0.95Alx(OH)2(anionn−)x/n (x = 0–0.2, n = 1, 2)

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Origin of Performance Differences of Nickel‐Rich LiNi_0.9Mn_0.1O₂ Cathode Materials Synthesized in Oxygen and Air

Origin of Performance Differences of Nickel‐Rich LiNi_0.9Mn_0.1O₂ Cathode Materials Synthesized in Oxygen and Air