Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province

Qinhuangdao, China

Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province

Qinhuangdao, China
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Zhang J.,Northeastern University China | Zhang J.,Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province | Luo S.,Northeastern University China | Luo S.,Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province | And 12 more authors.
Journal of Alloys and Compounds | Year: 2017

Olivine structure LiMnPO4/C cathode is synthesized by a hydrothermal method with high specific surface area Li3PO4precursor in PEG400-H2O mixed solution system. The synthetic conditions are systematically optimized and statistical analysis using orthogonal experiments. The physical and electrochemical properties of Li3PO4and LiMnPO4/C samples prepared under the optimized conditions are investigated in detail. The XRD and SEM results show that Li3PO4powders are pure phase with uniformly hollow spherical morphology. The Nitrogen adsorption-desorption isotherm exhibits the specific surface area of Li3PO4powders are 79.19 m2/g. LiMnPO4reveals a well ordered olivine structure and possess small and unagglomerated particles, which generates from the Li3PO4precursor structure. The electrochemical measurements show that pure LiMnPO4/C sample prepared under the optimal conditions delivers a maximum discharge capacity of 121.3 mAh/g at a 0.1 C rate. After 100 cycles, the discharge capacity decreases to 115.1 mAh/g with the capacity retention of 94.89%. © 2017 Elsevier B.V.


Zhang J.,Northeastern University China | Zhang J.,Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province | Luo S.,Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province | Luo S.,Northeastern University China | And 12 more authors.
Journal of Solid State Electrochemistry | Year: 2017

LiMn1-xYxPO4/C (x = 0, 0.01, 0.02, 0.04) materials have been prepared by a simple sol-gel method using glycollic acid as chelating agent and carbon source. The typical structure, micromorphology, and electrochemical properties of the multi-component compound LiMn1-xYxPO4/C have been investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), charge-discharge tests, and electrochemical impedance spectroscopy (EIS) analysis method. The results indicate that a 1 mol% yttrium substitution of LiMnPO4/C composite material has the smallest particle size and uniform distribution. Among all the samples, LiMn0.99Y0.01PO4/C shows long-term cycling performance and rate capability with the discharge capacity of 153.6, 150.8, 148.7, and 146.7 mAh g−1 at 0.05, 0.1, 0.5 and 1 C, respectively. After 50 cycles, the specific discharge capacity is 148.1 mAh g−1 with capacity retention of 3.6% at 0.05 C rate. In conclusion, rare metal ion substitution is an effective route to improve the electrochemical performance of this kind of materials. © 2017 Springer-Verlag Berlin Heidelberg


Huang H.,Northeastern University China | Huang H.,Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province | Luo S.,Northeastern University China | Luo S.,Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province | And 17 more authors.
Journal of Alloys and Compounds | Year: 2017

Highly mesoporous cobalt oxide nanosheets are grown on nickel foam (M-Co3O4/NF) by a hydrothermal method. Ag nanoparticles with 10–50 nm diameters are uniformly distributed on the surface of the mesoporous Co3O4 nanosheets (Ag/M-Co3O4/NF) after chemical bath reaction. Moreover, we discovered that the homogeneous distribution of Ag nanoparticles on free-standing, highly mesoporous Co3O4 nanosheets showed the synergistic effect of the high electrocatalyst reactions toward the ORR from Ag and OER from M-Co3O4. Highly mesoporous Co3O4 nanosheets with a thickness of 10 nm as free-standing cathode for Li-O2 battery are beneficial to accommodating insoluble discharge products and facilitating oxygen diffusion and electrolyte impregnation. Ag nanoparticles can improve the electrical conductivity of the O2 electrode and provide a catalytic activity for ORR at the same time. The Ag/M-Co3O4/NF exhibited a robust catalytic activity as cathode for Li-O2 batteries with a high reversible capacity of 2471.1 mA h g−1, a low discharge/charge overpotential, and a cycle life of 124 cycles (under the curtaining capacity of 500 mA h g−1). The preliminary results indicate that Ag/M-Co3O4/NF is an efficient and stable bifunctional cathode for Li-O2 batteries. © 2017


Wu L.,Northeastern University China | Wu L.,Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province | Dong C.,China Electronics Technology Group Corporation | Li J.,Northeastern University China | And 4 more authors.
Materials Express | Year: 2017

BiFeO3 nanoparticles with different atomic arrangements were synthesized. The ferromagnetism of BiFeO3 nanoparticles was affected directly by the degree of crystallization. A stronger saturation magnetization ∼2.914 emu/g was obtained in partially-crystallized BiFeO3 nanoparticles. In addition, the partially-crystallized BiFeO3 showed a 6 K shift of the spin-glass-like freezing temperature and exchange bias field kept almost zero with the change of temperature, which demonstrated a common control of the ferromagnetism and antiferromagnetism were achieved by changing the atomic arrangement order degree. © 2017 by American Scientific Publishers. All rights reserved.


Zhang J.,Northeastern University China | Zhang J.,Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province | Luo S.,Northeastern University China | Luo S.,Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province | And 12 more authors.
Electrochimica Acta | Year: 2016

LiAlO2 composited LiMnPO4/C cathode material has been synthesized by in-situ growth hydrothermal method. The coexistence of minor LiAlO2 in LiMnPO4 plays an important role in electrochemical properties. The composite is characterized by XRD, SEM, HRTEM, Raman microprobe spectroscopy and their electrochemical properties are also studied. It shows that the LiAlO2 is composed of pure α-LiAlO2 phase with flaky-shaped nanoplates. LiAlO2 nanoplates porous structure is inherited from anodic aluminum oxide (AAO) structure and serves as substrates to grow LiMnPO4 nanocrystals, which provide a high surface area with a porous structure. The structure of LiMnPO4 is not affected by LiAlO2 nanoplates compositing. Among the investigated samples, the one with 6 wt.% LiAlO2 exhibits a higher specific discharge capacity of 142.8 mAh/g at 0.05C rate with a high capacity retention of 94.8% after 50 cycles. Electrochemical impedance spectroscopy (EIS) results show that the lithium diffusion constant (DLi +) for 6 wt.% content LiAlO2-LiMnPO4/C electrode is 2.07 × 10-14 cm2/s which is higher than the values for other contents LiAlO2-LiMnPO4/C electrode. The LiAlO2 is effective in suppressing the increase of the interfacial resistance between the electrode/electrolyte interface during charge-discharge cycling. © 2016 Elsevier Ltd. All rights reserved.


Bao S.,Northeastern University China | Luo S.,Northeastern University China | Luo S.,Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province | Wang Z.,Northeastern University China | And 5 more authors.
Journal of Power Sources | Year: 2017

P2-type manganese-based ternary transition metal oxides have triggered extensive researches as potential cathode materials for sodium ion batteries. However, these kinds of materials display the large difference in electrochemical performance with sodium content varying from 0.45 to 0.8, the relevant investigations on effects of sodium content are insufficient. In this work, we synthesize a series of spherical P2-type cathode materials NaxNi0.167Co0.167Mn0.67O2 with different sodium content (x = 0.45, 0.55, 0.67, 0.8, 0.9, 1) and investigate the effects of sodium content on structure and electrochemical performance. The results reveal that NaxNi0.167Co0.167Mn0.67O2 (x = 0.45, 0.55) consist of P2-phase and P3-phase, while NaxNi0.167Co0.167Mn0.67O2 (x = 0.67, 0.8, 0.9, 1) exhibit pure P2-phase. Na0.45Ni0.167Co0.167Mn0.67O2 delivers an initial discharge capacity of 143 mAh g−1, while a fast capacity decay is observed after 50 cycles. In comparison, Na0.67Ni0.167Co0.167Mn0.67O2 shows excellent cycling stability and rate performance. The significant difference in electrochemical performance is attributed to the initial sodium content, which leads to the existence of P3-phase. Moreover, higher sodium content promotes primary particles to grow larger and thicker, which is not favorable for the diffusion of Na+. Generally, Na0.67Ni0.167Co0.167Mn0.67O2 is favored by suitable sodium content, offers excellent electrochemical performance in terms of capacity, rate performance and cycling stability. © 2017 Elsevier B.V.


Wang Z.,Northeastern University China | Wang Z.,Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province | Luo S.,Northeastern University China | Luo S.,Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province | And 9 more authors.
RSC Advances | Year: 2016

The poor cycling stability resulting from large volume change is the major obstacle to the application of tin-based anode materials. In this paper, three-dimensional porous carbon nanosheet networks anchored with Cu6Sn5@carbon nanoparticles (10-35 nm) as a high-performance anode for lithium ion batteries are synthesized via a self-assembly NaCl template-assisted in situ chemical vapor deposition strategy. The composite exhibits superior rate capability (523, 443, 395, 327, 281, and 203 mA h g-1 at 0.2, 0.5, 1, 2, 5, and 10 A g-1, respectively) and excellent cycling stability (396.8 mA h g-1 at 1 A g-1 for the first cycle and maintains 92.3% after 200 cycles). The superior performance is attributed to the unique architecture: inactive metal copper serves as a "buffer matrix" and relaxes the large volume change of the tin; a uniform distribution of nano-sized Cu6Sn5 makes the inevitable stress/strain small, meanwhile it provides a short path for lithium ion diffusion; onion-like carbon shells not only prevent the Cu6Sn5 nanoparticles from agglomerating and growing but also offer mechanical support to accommodate the stress associated with the volume change of tin upon cycling, thus alleviating pulverization; 3D porous carbon nanosheet networks ensure the mechanical integrity and facilitate lithium ion diffusion as well as electron transportation. © 2016 The Royal Society of Chemistry.


Zhou C.,Lanzhou University | Wu L.,Northeastern University China | Wu L.,Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province | Zhang C.,Lanzhou University | And 2 more authors.
Journal of Physics D: Applied Physics | Year: 2016

The resistance switching behavior induced by in-plane read current in SrRuO3/Pb(Mg1/3Nb2/3)O3-PbTiO3 heterostructures is investigated at different temperatures. With decreasing in-plane read current from 10 mA to 0.01 mA, the symmetrical butterfly-like shape of resistance is gradually converted to an antisymmetrical shape at different temperatures, which is resulted from the enhancement of polarization current effect. Specifically, non-volatile resistance behaviors induced by asymmetric bipolar sweeping of electric field and pulsed electric field are achieved at different temperatures. Our results suggests resistance switching behavior dependence of in-plane read current, which is crucial for further application of complex oxide magnetoelectric and spintronic devices. © 2016 IOP Publishing Ltd.


Zu Q.R.,Northeastern University China | Bai J.,Northeastern University China | Bai J.,Key Laboratory of Dielectric and Electrolyte Functional Material Hebei Province | Wang X.S.,Northeastern University China | And 5 more authors.
Materials Science Forum | Year: 2016

Ni-Mn-In is a novel type of magnetic shape memory alloy, its shape memory effect has been realized through magnetic field induced reverse martensitic transformation. A variety of point defects would be generated during composition adjustment process, such as antisite defect, vacancy and exchange. The first–principles calculations within the framework of the density functional theory using the Vienna ab initio software package (VASP) have been used in this paper to investigate the defect formation energy and electronic configuration of the off-stoichiometric Ni-X-In (X= Mn, Fe and Co) alloys. The In antisite on the X sublattice (InX) and the Ni antisite on the X sublattice (NiX) have the lowest formation energies in the investigated series. The formation energy of the Ni vacancy is the lowest, while that of the in vacancy is the highest. It is confirmed that the in constituent plays a dominant role for stabilizing the austenitic phase. © 2016 Trans Tech Publications, Switzerland.

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