A facile and surfactant-free synthesis of porous hollow λ-MnO2 3D nanoarchitectures for lithium ion batteries with superior performance

Kim, Hyunwoo; Nulu, Venugopal; Yoon, Jaesang; Yoon, Won‐Sub

doi:10.1016/j.jallcom.2018.11.107

Cited by 49 publications

(32 citation statements)

References 73 publications

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“…The nanoflake‐enclosed hollow urchin‐like morphology of the prepared materials is known to be beneficial in terms of improving the lithium storage performance because the void space buffers the volume changes during the repeated lithiation/delithiation cycles, and the numerous nanoflakes provide a sufficient electrolyte contact area to enhance the reaction kinetics. [ 40,48–52 ]…”

Section: Resultsmentioning

confidence: 99%

Polymorphic Effects on Electrochemical Performance of Conversion‐Based MnO₂ Anode Materials for Next‐Generation Li Batteries

Kim

Choi

Yoon

et al. 2021

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In this study, four different MnO2 polymorphs are synthesized with a controlled morphology of hollow porous structures to systematically investigate the influences of polymorphs in conversion‐based material. As the structure of these materials transforms into nanosized metal and maintains an extremely low‐crystalline phase during cell operation, the effects of polymorphs are overlooked as compared to the case of insertion‐based materials. Thus, differences in the ion storage behaviors among various MnO2 polymorphs are not well identified. Herein, the structural changes, charge storage reaction, and electrochemical performance of the different MnO2 polymorphs are investigated in detail. The experimental results demonstrate that the charge storage reactions, as part of which spinel‐phased MnO2 formation is observed after lithiation and delithiation instead of recovery of the original phases, are similar for all the samples. However, the electrochemical performance varies depending on the initial crystal structure. Among the four polymorphs, the spinel‐type λ‐MnO2 delivers the highest reversible capacity of ≈1270 mAh g−1. The structural similarity between the cycled and pristine states of λ‐MnO2 induces faster kinetics, resulting in the better electrochemical performance. These findings suggest that polymorphs are another important factor to consider when designing high‐performance materials for next‐generation rechargeable batteries.

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Section: Resultsmentioning

confidence: 99%

Polymorphic Effects on Electrochemical Performance of Conversion‐Based MnO₂ Anode Materials for Next‐Generation Li Batteries

Kim

Choi

Yoon

et al. 2021

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“…Figure a gives CV curve of AB@MnO 2 measured at 0.1 mV s −1 in the voltage range of 0–3 V. Three reduction peaks at 1.5 V, 0.75 V and 0.2 V are observed in the first cathodic scan. The peak at 1.5 V may be related to the insertion of Li + into MnO 2 crystal structure . The peaks at 0.75 V and 0.2 V can be assigned to the formation of SEI film and the reduction of Mn 2+ into Mn.…”

Section: Resultsmentioning

confidence: 95%

Mulberry‐Like Core‐Shell Structured C@MnO₂ as Electrode Material for Li–Ion Batteries and Pseudo‐Capacitors

Zhu

Zhang

et al. 2020

ChemistrySelect

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In present work, mulberry-like core-shell structured C@MnO 2 was synthesized as electrodes for Li-ion batteries and pseudocapacitors. Benefiting from the nanoporous shell and conductive carbon core that improve the ion transference and conductivity, the C@MnO 2 delivers excellent electrochemical performance in terms of a stable lithium storage capacity of 553 mAh g À 1 after 250 cycles under 0.5 A g À 1 and a high capacitance up to 274.44F g À 1 under 1 A g À 1 in 6 M KOH and the capacity retention is 90.2% after 5000 cycles. Such electrochemical properties combined with the facile synthesis route make C@MnO 2 promising electrode materials for energy storage.[a] Dr.

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“…), metal sulfides, phosphides, and nitrides are investigated as anode materials for the successful implementation of advanced LIBs. [5,6,7] Among the anodes of the LIBs, Si has been firmly investigated as one of the most promising anode material owing to its high theoretical capacity (� 4200 mAh g À 1 ), which is ten times as that of the commercially used graphite (� 372 mAh g À 1 ). Additionally, its low working potential (�0.4 V vs. Li /Li + ), abundance, and environmentally benign characteristics further promote its practical applicability as an anode material.…”

Section: Introductionmentioning

confidence: 99%

“…In this view, different non‐carbon anode materials with high theoretical capacities have been considered such as Si, Ge, Sn, Al, metal oxides (Co 3 O 4 , Fe 2 O 3 , NiO, etc. ), metal sulfides, phosphides, and nitrides are investigated as anode materials for the successful implementation of advanced LIBs . Among the anodes of the LIBs, Si has been firmly investigated as one of the most promising anode material owing to its high theoretical capacity (

\sim 4200

mAh g −1 ), which is ten times as that of the commercially used graphite (

\sim 372

mAh g −1 ).…”

Section: Introductionmentioning

confidence: 99%

Si/SiO_x Nanoparticles Embedded in a Conductive and Durable Carbon Nanoflake Matrix as an Efficient Anode for Lithium‐Ion Batteries

Nulu

Sohn

2020

ChemElectroChem

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In this study, a route to synthesize a Si@SiO x /carbon nanoflake nanocomposite is proposed using ecological and polar solventsoluble ethyl cellulose as a promising new carbon source for obtaining silicon composites. Equal proportions of ethylcellulose and commercial nanosilicon powders are used to prepare the silicon/organic hybrid through an in situ chemical process, and the subsequent carbonization affords the Si@SiO x /C composite. The SiO x layer is partially formed using the employed method and air drying processes. As an anode electrode for lithium-ion batteries (LIBs), the composite provides excellent reversible capacity (1830 mAh g À 1 at 200 mA g À 1 after 60 cycles) with 92 % capacity retention and superior rate performance (1464 mAh g À 1 at 3.2 A g À 1). The electrode with a high mass loading of 3.42 mg cm À 2 delivered discharge capacities of 753 and 387 mAh g À 1 at high current densities of 2 A g À 1 and 4 A g À 1 , respectively. These results show that the coupling of silicon nanoparticles with an oxide layer and a conductive carbon framework is an effective design to retain the inherent properties of the silicon-based anode, exhibiting its potential for use as a low-cost anode for practical applications.

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A facile and surfactant-free synthesis of porous hollow λ-MnO2 3D nanoarchitectures for lithium ion batteries with superior performance

Cited by 49 publications

References 73 publications

Polymorphic Effects on Electrochemical Performance of Conversion‐Based MnO₂ Anode Materials for Next‐Generation Li Batteries

Polymorphic Effects on Electrochemical Performance of Conversion‐Based MnO₂ Anode Materials for Next‐Generation Li Batteries

Mulberry‐Like Core‐Shell Structured C@MnO₂ as Electrode Material for Li–Ion Batteries and Pseudo‐Capacitors

Si/SiO_x Nanoparticles Embedded in a Conductive and Durable Carbon Nanoflake Matrix as an Efficient Anode for Lithium‐Ion Batteries

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A facile and surfactant-free synthesis of porous hollow λ-MnO2 3D nanoarchitectures for lithium ion batteries with superior performance

Cited by 49 publications

References 73 publications

Polymorphic Effects on Electrochemical Performance of Conversion‐Based MnO2 Anode Materials for Next‐Generation Li Batteries

Polymorphic Effects on Electrochemical Performance of Conversion‐Based MnO2 Anode Materials for Next‐Generation Li Batteries

Mulberry‐Like Core‐Shell Structured C@MnO2 as Electrode Material for Li–Ion Batteries and Pseudo‐Capacitors

Si/SiOx Nanoparticles Embedded in a Conductive and Durable Carbon Nanoflake Matrix as an Efficient Anode for Lithium‐Ion Batteries

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Polymorphic Effects on Electrochemical Performance of Conversion‐Based MnO₂ Anode Materials for Next‐Generation Li Batteries

Polymorphic Effects on Electrochemical Performance of Conversion‐Based MnO₂ Anode Materials for Next‐Generation Li Batteries

Mulberry‐Like Core‐Shell Structured C@MnO₂ as Electrode Material for Li–Ion Batteries and Pseudo‐Capacitors

Si/SiO_x Nanoparticles Embedded in a Conductive and Durable Carbon Nanoflake Matrix as an Efficient Anode for Lithium‐Ion Batteries