Fabrication of NiFe2O4/C hollow spheres constructed by mesoporous nanospheres for high-performance lithium-ion batteries

Jin, Rencheng; Jiang, Hua; Sun, Yexian; Ma, Yinfa; Li, Honghao; Chen, Gang

doi:10.1016/j.cej.2016.06.032

Cited by 125 publications

(30 citation statements)

References 56 publications

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“…Lithium ion batteries (LIBs) have been applied successfully in the fields of portable electronic devices and electric vehicles electronics due to its advantages of high energy density and long cycle life. [1][2][3][4][5] However, the low theoretical capacity and poor rate capability of the graphite anodes cannot meet the ever-increasing demands for electric vehicle, aerospace and military industries. Therefore, exploiting high-capacity substitutions becomes crucial for battery development.…”

Section: Introductionmentioning

confidence: 99%

CNTs@C@Cu_2‐xSe Hybrid Materials: An Advanced Electrode for High Performance Lithium Batteries and Supercapacitors

et al. 2018

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In this work, one dimensional CNTs@C anchored with Cu2‐xSe nanospheres have been prepared by a facile solvothermal method. The parameters affected the morphology of the sample are investigated. When evaluated as anode for Li ion batteries, the obtained CNTs@C@Cu2‐xSe electrode delivers enhanced electrochemical performance with high reversible capacity, better cycle stability and rate capability. After 100th cycle, a discharge capacity of 399 mAh g−1 can be achieved at 0.1 A g−1. Even at high rate of 2 A g−1, the electrode can still keep a capacity of 198 mAh g−1 after 50 cycles. In addition, the obtained CNTs@C@Cu2‐xSe shows typical faradaic redox properties and exhibits excellent specific capacity (302.7 g−1 at 1 A g−1) and prominent cycling stability (86.9 % capacity retention after 2000 cycles at 2 A g−1). The enhanced electrochemical performance can be attributed to the unique structure. The Cu2‐xSe nanospheres consist of numerous nanocrystalline, which increases the contact area between Cu2‐xSe and electrolyte, reduces the pave length as well as accommodates volume change during cycling. The amorphous carbon layer with numerous carboxyl and hydroxyl groups strengthens the adhesion between the Cu2‐xSe and the CNTs. And the CNTs can enhance the conductivity of Cu2‐xSe and alleviate the mechanical stress and strain of the electrode during charge and discharge process.

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Section: Introductionmentioning

confidence: 99%

CNTs@C@Cu_2‐xSe Hybrid Materials: An Advanced Electrode for High Performance Lithium Batteries and Supercapacitors

et al. 2018

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“…While the oblique line at the low frequency region can be ascribed to the Warburg impedance (W 0 ) related to Li + ion solid-state diffusion in the electrode. 64 The Nyquist plots were tted by ZView soware based on the equivalent circuit in Fig. S6, † and the tting lines match with the experimental data very well, as shown in Fig.…”

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confidence: 79%

Urea-assisted hydrothermal synthesis of a hollow hierarchical LiNi_0.5Mn_1.5O₄ cathode material with tunable morphology characteristics

et al. 2018

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A hollow hierarchical LiNi 0.5 Mn 1.5 O 4 cathode material has been synthesized via a urea-assisted hydrothermal method followed by a high-temperature calcination process. The effect of reactant concentration on the structure, morphology and electrochemical properties of the carbonate precursor and corresponding LiNi 0.5 Mn 1.5 O 4 product has been intensively investigated. The as-prepared samples were characterized by XRD, FT-IR, SEM, CV, EIS, GITT and constant-current charge/discharge tests. The results show that all samples belong to a cubic spinel structure with mainly Fd3m space group, and the Mn 3+ content and impurity content initially decrease and then increase slightly with the reactant concentration increasing. SEM observation shows that the particle morphology and size of carbonate precursor can be tailored by changing reactant concentration. The LiNi 0.5 Mn 1.5 O 4 sample obtained from the carbonate precursor hydrothermally synthesized at a reactant concentration of 0.3 mol L À1 exhibits the optimal overall electrochemical properties, with capacity retention rate of 96.8% after 100 cycles at 1C rate and 10C discharge capacity of 124.9 mA h g À1, accounting for 99.9% of that at 0.2C rate. The excellent electrochemical performance can be mainly attributed to morphological characteristics, that is, smaller particle size with homogeneous distribution, in spite of lower Mn 3+ content. IntroductionLithium ion batteries (LIBs) are being intensively pursued for high-power and high-energy applications such as electric vehicles (EVs) and hybrid electric vehicles (HEVs). 1,2 The energy density of LIB is generally limited by the cathode material. One practical and cost-effective way to improve the energy density of cathode material is elevating the working voltage. Among all cathode materials, LiNi 0.5 Mn 1.5 O 4 spinel has been regarded as one of the most promising cathodes for LIB, owing to high working voltage (4.7 V vs. Li/Li + ) and high energy density (650 W h kg À1 ). 3,4 In addition, the inherently fast Li + ion diffusion within its 3D spinel structure leads to good rate capability and cycling stability. 5 However, simultaneously achieving satisfactory cyclability and rate performance for LiNi 0.5 Mn 1.5 O 4 remains challenging due to complex performance-inuencing factors and electrolyte/structure instability under high potential. 6,7To date, there are three main approaches to solve the above problem, such as surface modication, cation doping and particle size reduction to nanoscale level. The nanosized materials generally show improved rate performance by shorter Li + ion diffusion channel and larger surface area.Unfortunately, low thermodynamic stability of nanoparticles results in electrochemical agglomeration and raises the risk of side reaction with electrolyte, thus leading to inferior cycling stability. 8,9 Recently, the cathodes with hierarchical hollow structure have attracted considerable interests for the coimprovement of rate capability and cycle performance. 10,11On the one hand, this kind...

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“…2d) and can be assigned to Ni 2p 3/2 and Ni 2p 1/2 , respectively, corresponding to Ni 2+ . 50 The observed P 2p binding energies at 133.8 eV were typical of oxidized phosphate species (PO 4 3À ) in Ag 3 PO 4 (shown in Fig. 2e).…”

Section: X-ray Diffraction Analysismentioning

confidence: 98%

Fabrication of Ag₃PO₄/GO/NiFe₂O₄ composites with highly efficient and stable visible-light-driven photocatalytic degradation of rhodamine B

et al. 2018

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Fabrication of NiFe2O4/C hollow spheres constructed by mesoporous nanospheres for high-performance lithium-ion batteries

Cited by 125 publications

References 56 publications

CNTs@C@Cu_2‐xSe Hybrid Materials: An Advanced Electrode for High Performance Lithium Batteries and Supercapacitors

CNTs@C@Cu_2‐xSe Hybrid Materials: An Advanced Electrode for High Performance Lithium Batteries and Supercapacitors

Urea-assisted hydrothermal synthesis of a hollow hierarchical LiNi_0.5Mn_1.5O₄ cathode material with tunable morphology characteristics

Fabrication of Ag₃PO₄/GO/NiFe₂O₄ composites with highly efficient and stable visible-light-driven photocatalytic degradation of rhodamine B

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Fabrication of NiFe2O4/C hollow spheres constructed by mesoporous nanospheres for high-performance lithium-ion batteries

Cited by 125 publications

References 56 publications

CNTs@C@Cu2‐xSe Hybrid Materials: An Advanced Electrode for High Performance Lithium Batteries and Supercapacitors

CNTs@C@Cu2‐xSe Hybrid Materials: An Advanced Electrode for High Performance Lithium Batteries and Supercapacitors

Urea-assisted hydrothermal synthesis of a hollow hierarchical LiNi0.5Mn1.5O4 cathode material with tunable morphology characteristics

Fabrication of Ag3PO4/GO/NiFe2O4 composites with highly efficient and stable visible-light-driven photocatalytic degradation of rhodamine B

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CNTs@C@Cu_2‐xSe Hybrid Materials: An Advanced Electrode for High Performance Lithium Batteries and Supercapacitors

CNTs@C@Cu_2‐xSe Hybrid Materials: An Advanced Electrode for High Performance Lithium Batteries and Supercapacitors

Urea-assisted hydrothermal synthesis of a hollow hierarchical LiNi_0.5Mn_1.5O₄ cathode material with tunable morphology characteristics

Fabrication of Ag₃PO₄/GO/NiFe₂O₄ composites with highly efficient and stable visible-light-driven photocatalytic degradation of rhodamine B