Preparation of hollow spheres with controllable interior structures by heterogeneous contraction

Guan, Jianguo; Mou, Fangzhi; Sun, Zhigang; Shi, Weidong

doi:10.1039/c0cc01044h

Cited by 179 publications

(131 citation statements)

References 40 publications

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“…As determined by N 2 sorption measurement at 77 K ( Figure S5), such a double-shelled hollow structure gives rise to Brunauer-Emmett-Teller (BET) surface area of 11.4 m 2 g −1 and a relatively high pore volume of 0.24 cm 3 g −1 , the later is mainly contributed from the small macropores between the nanometer-sized building blocks. As expected based on the heterogeneous contraction mechanism, [25] the temperature ramping rate plays an important role on the morphology and structure of the products ( Figure S6). …”

Section: Doi: 101002/adma201104407mentioning

confidence: 87%

“…The formation of the double-shelled hollow structure during the thermal decomposition of Co 0.33 Mn 0.67 CO 3 is mainly based on the heterogeneous contraction caused by non-equilibrium heat treatment. [25] At the initial stage of calcination, there exists a large temperature gradient (ΔT) along the radical direction, which leads to the formation of a CoMn 2 O 4 shell at the surface of the Co 0.33 Mn 0.67 CO 3 core. Two forces of opposite directions act on the interface between the CoMn 2 O 4 shell and the Co 0.33 Mn 0.67 CO 3 core (the so-called heterogeneous contraction).…”

Section: Doi: 101002/adma201104407mentioning

confidence: 99%

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Double‐Shelled CoMn₂O₄ Hollow Microcubes as High‐Capacity Anodes for Lithium‐Ion Batteries

2011

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Section: Doi: 101002/adma201104407mentioning

confidence: 87%

Section: Doi: 101002/adma201104407mentioning

confidence: 99%

Double‐Shelled CoMn₂O₄ Hollow Microcubes as High‐Capacity Anodes for Lithium‐Ion Batteries

2011

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“…Afterwards, relative uniform microspheres are obtained due to the famous "Oswald ripening" process, driven by minimization of the surface energy. The fabrication of the yolk-shelled structure is mainly based on the heterogeneous contraction caused by the non-equilibrium heat treatment process during the thermal decomposition of ZnCo-glycolate [27]. [28].…”

Section: Resultsmentioning

confidence: 99%

Simple synthesis of yolk-shelled ZnCo2O4 microspheres towards enhancing the electrochemical performance of lithium-ion batteries in conjunction with a sodium carboxymethyl cellulose binder

et al. 2013

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Mixed metal oxides have been attracting more and more attention recently because of their advantages and superiorities, which can improve the electrochemical performance of single metal oxides. These advantages include structural stability, good electronic conductivity, and reversible capacity. In this work, uniform yolk-shelled ZnCo 2 O 4 microspheres were synthesized by pyrolysis of ZnCo-glycolate microsphere precursors which were prepared via a simple refluxing route without any precipitant or surfactant. The formation process of the yolk-shelled microsphere structure during the thermal decomposition of ZnCoglycolate is discussed, which is mainly based on the heterogeneous contraction caused by nonequilibrium heat treatment. The performances of the as-prepared ZnCo 2 O 4 electrodes using sodium carboxylmethyl cellulose (CMC) and poly-vinylidene fluoride (PVDF) as binders are also compared.Constant current and rate charge-discharge testing results demonstrated that the ZnCo 2 O 4 electrodes using CMC as the binder had better performance than those using PVDF as the binder. It was worth pointing out that the electrode using CMC as the binder nicely yields a discharge capacity of 331 mA h g À1 after 500 cycles at a current density of 1000 mA g À1 , which is close to the theoretical value of graphite (371 mA h g À1 ). Furthermore, the obtained synthetic insights on the complex hollow structures will be of benefit to the design of other anode materials for lithium ion batteries.

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“…94 In recent years, a non-equilibrium heat-treatment process has been widely used to fabricate core-shell structured and/or hollow metal oxide spheres. 58,95,96 Li et al synthesised porous cubic spinel Mn 1.5 Co 1.5 O 4 core-shell microspheres composed of a B400 nm-thick shell and a core with a diameter of B2.5 mm (Fig. 4i and j).…”

Section: General Aspects Of Spinel-type Transition Metal Oxidesmentioning

confidence: 99%

Porous nanoarchitectures of spinel-type transition metal oxides for electrochemical energy storage systems

Park

Kim

et al. 2015

Phys. Chem. Chem. Phys.

153

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. (2015). Porous nanoarchitectures of spinel-type transition metal oxides for electrochemical energy storage systems. Physical Chemistry Chemical Physics, 17 (46), 30963-30977. Porous nanoarchitectures of spinel-type transition metal oxides for electrochemical energy storage systems AbstractTransition metal oxides possessing two kinds of metals (denoted as AxB3-xO4, which is generally defined as a spinel structure; A, B = Co, Ni, Zn, Mn, Fe, etc.), with stoichiometric or even non-stoichiometric compositions, have recently attracted great interest in electrochemical energy storage systems (ESSs). The spinel-type transition metal oxides exhibit outstanding electrochemical activity and stability, and thus, they can play a key role in realising cost-effective and environmentally friendly ESSs. Moreover, porous nanoarchitectures can offer a large number of electrochemically active sites and, at the same time, facilitate transport of charge carriers (electrons and ions) during energy storage reactions. In the design of spinel-type transition metal oxides for energy storage applications, therefore, nanostructural engineering is one of the most essential approaches to achieving high electrochemical performance in ESSs. In this perspective, we introduce spinel-type transition metal oxides with various transition metals and present recent research advances in material design of spinel-type transition metal oxides with tunable architectures (shape, porosity, and size) and compositions on the micro-and nano-scale. Furthermore, their technological applications as electrode materials for next-generation ESSs, including metal-air batteries, lithium-ion batteries, and supercapacitors, are discussed. The spinel-type transition metal oxides exhibit outstanding electrochemical activity and stability, and thus, they can play a key role in realising cost-effective and environmentally friendly ESSs. Moreover, porous nanoarchitectures can offer a large number of electrochemically active sites and, at the same time, facilitate transport of charge carriers (electrons and ions) during energy storage reactions. In the design of spinel-type transition metal oxides for energy storage applications, therefore, nanostructural engineering is one of the most essential approaches to achieving high electrochemical performance in ESSs. In this perspective, we introduce spinel-type transition metal oxides with various transition metals and present recent research advances in material design of spinel-type transition metal oxides with tunable architectures (shape, porosity, and size) and compositions on the micro-and nano-scale.Furthermore, their technological applications as electrode materials for next-generation ESSs, including metal-air batteries, lithium-ion batteries, and supercapacitors, are discussed.

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Preparation of hollow spheres with controllable interior structures by heterogeneous contraction

Cited by 179 publications

References 40 publications

Double‐Shelled CoMn₂O₄ Hollow Microcubes as High‐Capacity Anodes for Lithium‐Ion Batteries

Double‐Shelled CoMn₂O₄ Hollow Microcubes as High‐Capacity Anodes for Lithium‐Ion Batteries

Simple synthesis of yolk-shelled ZnCo2O4 microspheres towards enhancing the electrochemical performance of lithium-ion batteries in conjunction with a sodium carboxymethyl cellulose binder

Porous nanoarchitectures of spinel-type transition metal oxides for electrochemical energy storage systems

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Preparation of hollow spheres with controllable interior structures by heterogeneous contraction

Cited by 179 publications

References 40 publications

Double‐Shelled CoMn2O4 Hollow Microcubes as High‐Capacity Anodes for Lithium‐Ion Batteries

Double‐Shelled CoMn2O4 Hollow Microcubes as High‐Capacity Anodes for Lithium‐Ion Batteries

Simple synthesis of yolk-shelled ZnCo2O4 microspheres towards enhancing the electrochemical performance of lithium-ion batteries in conjunction with a sodium carboxymethyl cellulose binder

Porous nanoarchitectures of spinel-type transition metal oxides for electrochemical energy storage systems

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Double‐Shelled CoMn₂O₄ Hollow Microcubes as High‐Capacity Anodes for Lithium‐Ion Batteries

Double‐Shelled CoMn₂O₄ Hollow Microcubes as High‐Capacity Anodes for Lithium‐Ion Batteries