High performance MnO@C microcages with a hierarchical structure and tunable carbon shell for efficient and durable lithium storage

Hou, Chuanxin; Tai, Zhixin; Zhao, Lanling; Zhai, Yanjie; Hou, Yue; Yang, Fan; Dang, Feng; Wang, Jun; Liu, Huan

doi:10.1039/c8ta02863j

Cited by 212 publications

(83 citation statements)

References 68 publications

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“…2.1 V appears and gradually enhances (Figure 5a and Figure S10a-b), which can originate from the further oxidization of Mn(II) to Mn (IV) with higher oxidation states, introducing the increasing capacity in the subsequent cyclic process. [18,26,40,52] However, there are no obvious peak at ca. 2.1 V during the initial 10 cycles in the CV curves of MnO nanoparticles ( Figure S10c-d), confirming that it is difficult to be further transferred to highoxidation-state MnO 2 for bare MnO nanoparticles without carbon hollow spheres as skeletons.…”

Section: Resultsmentioning

confidence: 98%

“…In addition, during the initial 10 cycles in the CV curves of NC@MnO HHSs, with the cycle number increased, a weak peak at ca. 2.1 V appears and gradually enhances (Figure a and Figure S10a–b), which can originate from the further oxidization of Mn(II) to Mn(IV) with higher oxidation states, introducing the increasing capacity in the subsequent cyclic process . However, there are no obvious peak at ca.…”

Section: Resultsmentioning

confidence: 99%

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Highly Reversible Lithium Storage of Nitrogen‐Doped Carbon@MnO Hierarchical Hollow Spheres as Advanced Anode Materials

et al. 2019

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The practical implementation of MnO‐based anode materials is still obstructed because of their short cyclic life and unsatisfactory rate performance, attributable to low conductivity, large volume variation and self‐aggregation of MnO during intense cycles. To overcome these obstacles, we successfully fabricated nitrogen‐doped carbon@MnO hierarchical hollow spheres through a novel approach. As anode nanomaterials for Li‐ion batteries, the nanocomposite possesses a highly reversible capacity of 1302 mAh g−1 after the 200th cycle at 0.1 Ag−1 and 964 mAh g−1 after the 500th cycle at 0.5 Ag−1, respectively. The prominent electrochemical performances of the nanocomposite may result from synthetic effects of nitrogen‐doped carbon hollow structures, nanosized MnO and the gradual generation of high‐oxide‐state manganese oxide on nitrogen‐doped carbon hollow spheres during intensive cycles. The aforementioned results also demonstrate that MnO nanocrystals can be well utilized by attaching to nitrogen‐doped carbon hollow spheres, which is a valid way to achieve excellent lithium storage properties for transition metal oxides.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Highly Reversible Lithium Storage of Nitrogen‐Doped Carbon@MnO Hierarchical Hollow Spheres as Advanced Anode Materials

et al. 2019

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“…53.9% of capacity is derived from the capacitive contribution at a scan rate of 0.5 mV s −1 . The higher contribution of capacitance corresponds to the short Li + diffusion length and quick electron transfer of C‐NHSNCM anode …”

Section: Resultsmentioning

confidence: 99%

A Flexible Film toward High‐Performance Lithium Storage: Designing Nanosheet‐Assembled Hollow Single‐Hole Ni–Co–Mn–O Spheres with Oxygen Vacancy Embedded in 3D Carbon Nanotube/Graphene Network

Zhao

Feng

et al. 2019

Small

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Ternary transition metal oxides (TMOs) are highly potential electrode materials for lithium ion batteries (LIBs) due to abundant defects and synergistic effects with various metal elements in a single structure. However, low electronic/ionic conductivity and severe volume change hamper their practical application for lithium storage. Herein, nanosheet‐assembled hollow single‐hole Ni–Co–Mn oxide (NHSNCM) spheres with oxygen vacancies can be obtained through a facile hydrothermal reaction, which makes both ends of each nanosheet exposed to sufficient free space for volume variation, electrolyte for extra active surface area, and dual ion diffusion paths compared with airtight hollow structures. Furthermore, oxygen vacancies could improve ion/electronic transport and ion insertion/extraction process of NHSNCM spheres. Thus, oxygen‐vacancy‐rich NHSNCM spheres embedded into a 3D porous carbon nanotube/graphene network as the anode film ensure efficient electrolyte infiltration into both the exterior and interior of porous and open spheres for a high utilization of the active material, showing an excellent electrochemical performance for LIBs (1595 mAh g−1 over 300 cycles at 2 A g−1, 441.6 mAh g−1 over 4000 cycles at 10 A g−1). Besides, this straightforward synthetic method opens an efficacious avenue for the construction of various nanosheet‐assembled hollow single‐hole TMO spheres for potential applications.

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“…During the last decades, polymers and their composites have been continuously displacing the conventional materials, due to their relatively simple processability, low manufacturing cost, and outstanding corrosion resistance . The enhanced physical, chemical, and engineering properties make these materials widely used in the industrial fields, to be specific, the fabrication of the helicopter rotors, wind turbine blades, water blades, aircrafts, sensors, electromagnetic interface (EMI) shielding, and pipelines . In a series of polymers, a segmented copolymer thermoplastic polyurethane (TPU) with hard and soft blocks attracts tremendous attention for both scientific research and industrial applications .…”

Section: Introductionmentioning

confidence: 99%

Enhanced Solid Particle Erosion Properties of Thermoplastic Polyurethane‐Carbon Nanotube Nanocomposites

Dong

Wang

Liu

et al. 2019

Macro Materials & Eng

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A co‐coagulation method combined with hot pressing technique is successfully applied to fabricate thermoplastic polyurethane (TPU) nanocomposites with different contents of carbon nanotubes (CNTs). Obviously, the mechanical and thermal properties of the nanocomposites are improved with increasing the CNT content. In addition, the existence of hydrogen bonding between CNTs and polymer matrix is demonstrated. Furthermore, the influences of impact parameters on solid particle erosion behavior are investigated systematically. The surface roughness and line roughness are also investigated to illustrate the mechanism of solid particle erosion. As elastic nanocomposites, the maximum and minimum erosion rate (ER) occur at 30° and 90°. The ER is relatively small when the impact velocity is at 10 m s−1, then is increased rapidly between 20 and 30 m s−1. As the size of impact particles increases to 300 µm, a rapid increase of ER occurs between 10 and 20 m s−1. All these results indicate CNTs improve the erosion resistance of TPU matrix.

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High performance MnO@C microcages with a hierarchical structure and tunable carbon shell for efficient and durable lithium storage

Abstract: MnO@C microcages with robust sponge-like internal structure exhibit excellent Li-storage performance, holding favorable commercial potential as anodes for Li-ion batteries.

Cited by 212 publications

References 68 publications

Highly Reversible Lithium Storage of Nitrogen‐Doped Carbon@MnO Hierarchical Hollow Spheres as Advanced Anode Materials

Highly Reversible Lithium Storage of Nitrogen‐Doped Carbon@MnO Hierarchical Hollow Spheres as Advanced Anode Materials

A Flexible Film toward High‐Performance Lithium Storage: Designing Nanosheet‐Assembled Hollow Single‐Hole Ni–Co–Mn–O Spheres with Oxygen Vacancy Embedded in 3D Carbon Nanotube/Graphene Network

Enhanced Solid Particle Erosion Properties of Thermoplastic Polyurethane‐Carbon Nanotube Nanocomposites

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