β-MnO2 sacrificial template synthesis of Li1.2Ni0.13Co0.13Mn0.54O2 for lithium ion battery cathodes

Zhao, Chenhao; Wang, Xinxin; Li, Rui; Xu, Fenfen; Shen, Qiang

doi:10.1039/c3ra45428b

Cited by 20 publications

(11 citation statements)

References 38 publications

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“…The peak during the oxidation reaction at about 4.5 V was due to lithium and oxygen extraction from the Li 2 MnO 3 component 14,26 . In the sol-gel samples cycled at C/10 and C/3, the oxidation peaks were only observed in the first cycle, but the broad oxidation peaks around 4.35–4.40 are presented in the next cycles corresponding to oxidation reaction of Co 4+ to Co 3+ in LiCoO 2 component 39 . The LiCoO 2 activation becomes notable at the next cycles, due to the Li 2 MnO 3 component was completely activated at the first charge in the electrodes prepared by sol-gel method that had a small Li 2 MnO 3 domain size, which is easily activated at the initial charge.…”

Section: Resultsmentioning

confidence: 98%

Li2MnO3 domain size and current rate dependence on the electrochemical properties of 0.5Li2MnO3·0.5LiCoO2 cathode material

Kaewmala

Chantrasuwan

Wiriya

et al. 2017

Sci Rep

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Layered-layered composite oxides of the form xLi2MnO3·(1−x) LiMO2 (M = Mn, Co, Ni) have received much attention as candidate cathode materials for lithium ion batteries due to their high specific capacity (>250mAh/g) and wide operating voltage range of 2.0–4.8 V. However, the cathode materials of this class generally exhibit large capacity fade upon cycling and poor rate performance caused by structural transformations. Since electrochemical properties of the cathode materials are strongly dependent on their structural characteristics, the roles of these components in 0.5Li2MnO3·0.5LiCoO2 cathode material was the focus of this work. In this work, the influences of Li2MnO3 domain size and current rate on electrochemical properties of 0.5Li2MnO3·0.5LiCoO2 cathodes were studied. Experimental results obtained showed that a large domain size provided higher cycling stability. Furthermore, fast cycling rate was also found to help reduce possible structural changes from layered structure to spinel structure that takes place in continuous cycling.

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Section: Resultsmentioning

confidence: 98%

Li2MnO3 domain size and current rate dependence on the electrochemical properties of 0.5Li2MnO3·0.5LiCoO2 cathode material

Kaewmala

Chantrasuwan

Wiriya

et al. 2017

Sci Rep

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“…Especially, a diffraction peak located nearby 2θ degree of 23°represents the occupation of Li ion in the transition metal layer, because of coexistence of Li 2 MnO 3 component within LLOs. Generally speaking, the peak intensity ratio of I (003) /I (104) can be used to measure the structural order and cation mixing degree of layered materials, and a higher ratio indicates a better layered structure and lower cation mixing [5][6][7][8]19]. Herein, the ratio can reach as high as 1.57, indicating good layered structure of as-prepared sample.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, the resultant MnO 2 can be treated as a structural stabiliser to enhance the cycling stability of another component LiMO 2 even at a wide-voltage window (e.g. 2-4.8 V) [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Urea‐assisted combustion synthesis of porous Li _1.2 Ni _0.13 Co _0.13 Mn _0.54 O ₂ microspheres as high‐performance lithium‐ion battery cathodes

Zhao

Zhang

Qiu

et al. 2015

Micro & Nano Letters

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An initial urea-assisted combustion and subsequent high-temperature crystallisation route have been used to prepare porous Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 microspheres. The as obtained microspheres with the size of 2-4 μm are composed of numerous nanoparticles, and these nanoparticles with clear corner and edge have the size of 100-200 nm. A possible formation process of porous microspheres structures is discussed. As lithium-ion battery cathodes, the porous microspheres can deliver an initial discharge capacity of 252.3 mAh g −1 with high Coulombic efficiency of 80.6% at current density of 20 mA g −1 , and keep a stable discharge capacity of 115.5 mAh g −1 at 1000 mA g −1. Although the sample obtained without urea only deliver a discharge capacity of 66.7 mAh g −1 at 1000 mA g −1. Maybe, the facile urea-assisted combustion route is suitable for the synthesis of lithium-rich layered oxides as lithium-ion battery cathodes.

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“…Various synthesis methods have been used to prepare LLNMCs, such as sol-gel [11,[28][29][30][31], co-precipitation [32][33][34][35]), solid state reaction [36,37], molten salt [38] and combustion [39]. Among them, the sol-gel method is the most popular to produce homogeneous and stoichiometric nanosized materials [13,40].…”

Section: Introductionmentioning

confidence: 99%

Effects of chelators on the structure and electrochemical properties of Li-rich Li1.2Ni0.13Co0.13Mn0.54O2 cathode materials

Abdel-Ghany

Hashem

Mauger

et al. 2020

J Solid State Electrochem

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In this study, carboxylic acids, namely concentrated citric acid and ethylene diamine tetra-acetic acid (EDTA) solution, are used as chelators to synthesize Li-rich layered Li 1.2 Ni 0.13 Mn 0.54 Co 0.13 O 2 (LLNMC) by sol-gel method. We investigate the influence of these chelators on the morphology crystal properties and electrochemical performance of LNMC. Based on XRD data, the synthesized materials can be characterized as a combination of two phases, a rhombohedral R-3m phase (LiNi 1/3 Mn 1/3 Co 1/3 O 2) and a monoclinic C2/m phase (Li 2 MnO 3), which, according to the stoichiometry, are xLi 2 MnO 3 •(1-x)LiNi 1/3 Mn 1/3 Co 1/3 O 2 with x = 0.5. The morphology and local structure were studied using electron microscopy (SEM, TEM and HRTEM) and Raman spectroscopy, respectively. A clear evidence for the effect of chelating agent was observed from electrochemical tests carried out by galvanostatic charge-discharge cycling and electrochemical impedance spectroscopy. The sample prepared via EDTA as organic complexing agent exhibits the best electrochemical properties, with higher capacity and rate capability.

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β-MnO2 sacrificial template synthesis of Li1.2Ni0.13Co0.13Mn0.54O2 for lithium ion battery cathodes

Cited by 20 publications

References 38 publications

Li2MnO3 domain size and current rate dependence on the electrochemical properties of 0.5Li2MnO3·0.5LiCoO2 cathode material

Li2MnO3 domain size and current rate dependence on the electrochemical properties of 0.5Li2MnO3·0.5LiCoO2 cathode material

Urea‐assisted combustion synthesis of porous Li _1.2 Ni _0.13 Co _0.13 Mn _0.54 O ₂ microspheres as high‐performance lithium‐ion battery cathodes

Effects of chelators on the structure and electrochemical properties of Li-rich Li1.2Ni0.13Co0.13Mn0.54O2 cathode materials

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β-MnO2 sacrificial template synthesis of Li1.2Ni0.13Co0.13Mn0.54O2 for lithium ion battery cathodes

Cited by 20 publications

References 38 publications

Li2MnO3 domain size and current rate dependence on the electrochemical properties of 0.5Li2MnO3·0.5LiCoO2 cathode material

Li2MnO3 domain size and current rate dependence on the electrochemical properties of 0.5Li2MnO3·0.5LiCoO2 cathode material

Urea‐assisted combustion synthesis of porous Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 microspheres as high‐performance lithium‐ion battery cathodes

Effects of chelators on the structure and electrochemical properties of Li-rich Li1.2Ni0.13Co0.13Mn0.54O2 cathode materials

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Urea‐assisted combustion synthesis of porous Li _1.2 Ni _0.13 Co _0.13 Mn _0.54 O ₂ microspheres as high‐performance lithium‐ion battery cathodes