Superior electrochemical properties of Co3O4 yolk–shell powders with a filled core and multishells prepared by a one-pot spray pyrolysis

Son, Mun Yeong; Hong, Young Jun; Kang, Yun Chan

doi:10.1039/c3cc42117a

Cited by 59 publications

(41 citation statements)

References 33 publications

(32 reference statements)

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“…During spray pyrolysis, the Co 3 O 4 À C intermediate was formed in the front part of the reactor maintained at 800 8C. During this process, black Abstract: In this study, we report the first preparation of phase-pure Co 9 [40] The asprepared Co 3 O 4 yolk-shell microspheres exhibit a pure crystal structure and a distinctive core@void@shell structure, as evidenced from the X-ray diffraction (XRD) pattern and from scanning electron microscopy (SEM) imaging (Figure S1, Supporting Information). In the second step of the process, the as-prepared yolk-shell Co 3 O 4 microspheres were readily transformed into yolk-shell Co 9 S 8 microspheres by simple sulfidation under a reducing atmosphere.…”

Section: Resultsmentioning

confidence: 97%

“…The improved electrochemical performance of the yolk-shell Co 9 S 8 microspheres could be attributed to their unique structure consisting of a porous core and shell, which ensures easy diffusion of Li ions by offering them a shorter diffusion length. [40,45] The void space between the core and shell not only facilitated penetration of the electrolyte but also improved the structural stability during the Li-ion insertion/extraction processes by buffering the volume change.…”

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confidence: 99%

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Preparation of Yolk‐Shell and Filled Co₉S₈ Microspheres and Comparison of their Electrochemical Properties

Choi

Park

et al. 2013

Chemistry An Asian Journal

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In this study, we report the first preparation of phase-pure Co9S8 yolk–shell microspheres in a facile two-step process and their improved electrochemical properties. Yolk–shell Co3O4 precursor microspheres are initially obtained by spray pyrolysis and are subsequently transformed into Co9S8 yolk–shell microspheres by simple sulfidation in the presence of thiourea as a sulfur source at 350 °C under a reducing atmosphere. For comparison, filled Co9S8 microspheres were also prepared using the same procedure but in the absence of sucrose during the spray pyrolysis. The prepared yolk–shell Co9S8 microspheres exhibited a Brunauer–Emmett–Teller (BET) specific surface area of 18 m(2) g(−1) with a mean pore size of 16 nm. The yolk–shell Co9S8 microspheres have initial discharge and charge capacities of 1008 and 767 mA h g(−1) at a current density of 1000 mA g(−1), respectively, while the filled Co9S8 microspheres have initial discharge and charge capacities of 838 and 638 mA h g(−1), respectively. After 100 cycles, the discharge capacities of the yolk–shell and filled microspheres are 634 and 434 mA h g(−1), respectively, and the corresponding capacity retentions after the first cycle are 82% and 66%.

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Section: Resultsmentioning

confidence: 97%

mentioning

confidence: 99%

Preparation of Yolk‐Shell and Filled Co₉S₈ Microspheres and Comparison of their Electrochemical Properties

Choi

Park

et al. 2013

Chemistry An Asian Journal

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“…39,46 As compared to NPs, one-dimensional nanostructured materials are superior in mechanical stability 47 and in electron-collection efficiency because of directional electronic or ionic transportation. 3 Other kinds of nanostructures like core-shells 48,49 and yolk-shells 50,51 were also attempted to improve the performance of LIBs.…”

Section: Challenging Scientific Issues In the Research Of Libsmentioning

confidence: 99%

Review—Promises and Challenges of In Situ Transmission Electron Microscopy Electrochemical Techniques in the Studies of Lithium Ion Batteries

Xie

Jiang

Zhang³

2017

J. Electrochem. Soc.

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In situ transmission electron microscopy (TEM) electrochemistry with high-resolution characterization of morphology and microstructure is a powerful and practical technique to observe and analyze the lithiation and delithiation process of Li ions in the cathode and anode for comprehensively understanding the performance of Li-ion batteries (LIB), the formation of a solid electrolyte interphase (SEI), and the aging process during the investigation of LIBs. This review mainly focuses on the development and achievements of in situ TEM electrochemical techniques in investigating the mechanism of LIBs in recent years. Three types of in situ TEM electrochemical holders that are used commonly in the characterization of LIBs are presented. A calculation method for quantitative determination of the lithium diffusion coefficient (D Li ) in electrodes with in situ TEM electrochemical technique is also mentioned. Finally, the challenges, limitations, and future work for during application of the in situ TEM-electrochemistry technique are further discussed and reviewed from the perspective of morphology, influence of electron radiation on the decomposition of electrolyte, configuration of electrode, and determination of The heavy dependence on fossil fuels in modern society has brought serious environmental problems including air pollution, water pollution, CO 2 emissions, and global warming.1-3 These issues, as well as the foreseeable worldwide energy shortage, strongly demand renewable alternative sources and clean energy such as solar cells, hydroelectric power, and wind energy, which require advances in electrical energy conversion and storage technologies.4-6 Electrochemical devices such as batteries and electrochemical capacitors to store and restore electrical energy are possible solutions in the near-term because the conversion between electrical and chemical energy shares a common carrier (electrons).2,7-9 Moreover, compared to traditional batteries, lithium-ion batteries (LIBs) are more compact, portable, and have a high gravimetric capacity and power density, owing to the lighter molecular weight of lithium. 10,11 LIBs are widely used in present-day portable electronic gadgets such as mobile phones, laptops, tablet computers, and video camcorders, and the medical and aerospace industries for storing photovoltaic-generated dc electricity.12,13 Although possessing many advantages and in high demand, radical progress of such devices like LIBs has not been attained as yet because of their intrinsic complexity.14,15 There are many concurrent electrochemical, physical, and mechanical processes during their operation, 14,16 therefore, to enhance the overall properties of LIBs with high energy-density and long cycle-life, these aforementioned processes should operate in a predictable way across multiple environments.14 Until now, many basic principles regarding battery operation, including atomic conversion mechanism, electrode degradation, and evolution of electrolyte, are poorly understood.14 Recently, in situ electroch...

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“…[18][19][20][21][22][23][24][25][26][27] Recently, a simple spray pyrolysis process was successfully applied to the preparation of yolk-shell-structured powders. [22][23][24] Using this one-pot spray pyrolysis process, materials with single, binary, ternary, quaternary, and quinary yolkshell structures were successfully produced under the same preparation conditions. [24] The electrochemical properties of the yolk-shell-structured materials with single and binary metal oxides prepared by spray pyrolysis were mainly investigated.…”

Section: Introductionmentioning

confidence: 99%

“…[3] Yolk-shell powders with a distinctive core@void@shell configuration have been widely studied as anode materials for LIBs because of their structural stability and good electrochemical properties at high current densities. [18][19][20][21][22][23] Yolk-shell powders have predominantly been prepared in solution; the reaction conditions are strongly composition dependent. Therefore, the effects of the ratio of metal components comprising the binary transition-metal oxides on the yolk-shell structure have not been well studied.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Properties of Yolk–Shell‐Structured CuO–Fe₂O₃ Powders with Various Cu/Fe Molar Ratios Prepared by One‐Pot Spray Pyrolysis

Yang

Hong

2013

ChemSusChem

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Several yolk-shell-structured CuO-Fe2 O3 powders with various Cu/Fe molar ratios have been successfully prepared under equivalent reaction conditions using a one-pot spray pyrolysis process. The Cu and Fe components are uniformly distributed throughout the powders, irrespective of composition. The Brunauer-Emmett-Teller surface areas of the yolk-shell CuO-Fe2 O3 systems increased from 5 to 16 m(2) g(-1) if the Cu/Fe molar ratios are decreased from 3:1 to 1:3. The initial discharge and charge capacities of the yolk-shell CuO-Fe2 O3 system (Cu/Fe=1:2), showing maximum values at a constant current density of 1000 mA g(-1) , are 1436 and 1012 mA h g(-1) , respectively. After 130 cycles, the discharge capacities of the yolk-shell CuO-Fe2 O3 powders with Cu/Fe molar ratios of 1:3, 1:2, 1:1, 2:1, and 3:1 are 1159, 1151, 755, 655, and 651 mA h g(-1) , respectively. The discharge capacities of the yolk-shell and dense powder samples after 50 cycles, when subjected to a series of current density increases from 500 to 5000 mA g(-1) , are 735 and 495 mA h g(-1) , respectively.

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Superior electrochemical properties of Co3O4 yolk–shell powders with a filled core and multishells prepared by a one-pot spray pyrolysis

Cited by 59 publications

References 33 publications

Preparation of Yolk‐Shell and Filled Co₉S₈ Microspheres and Comparison of their Electrochemical Properties

Preparation of Yolk‐Shell and Filled Co₉S₈ Microspheres and Comparison of their Electrochemical Properties

Review—Promises and Challenges of In Situ Transmission Electron Microscopy Electrochemical Techniques in the Studies of Lithium Ion Batteries

Electrochemical Properties of Yolk–Shell‐Structured CuO–Fe₂O₃ Powders with Various Cu/Fe Molar Ratios Prepared by One‐Pot Spray Pyrolysis

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Superior electrochemical properties of Co3O4 yolk–shell powders with a filled core and multishells prepared by a one-pot spray pyrolysis

Cited by 59 publications

References 33 publications

Preparation of Yolk‐Shell and Filled Co9S8 Microspheres and Comparison of their Electrochemical Properties

Preparation of Yolk‐Shell and Filled Co9S8 Microspheres and Comparison of their Electrochemical Properties

Review—Promises and Challenges of In Situ Transmission Electron Microscopy Electrochemical Techniques in the Studies of Lithium Ion Batteries

Electrochemical Properties of Yolk–Shell‐Structured CuO–Fe2O3 Powders with Various Cu/Fe Molar Ratios Prepared by One‐Pot Spray Pyrolysis

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Preparation of Yolk‐Shell and Filled Co₉S₈ Microspheres and Comparison of their Electrochemical Properties

Preparation of Yolk‐Shell and Filled Co₉S₈ Microspheres and Comparison of their Electrochemical Properties

Electrochemical Properties of Yolk–Shell‐Structured CuO–Fe₂O₃ Powders with Various Cu/Fe Molar Ratios Prepared by One‐Pot Spray Pyrolysis