High-capacity and superior-behavior of the Ni-Cu co-doped spinel LiMn2O4 cathodes rapidly prepared by a microwave-induced solution flameless combustion

2021 ◽  
Author(s):  
Ruifang Chen ◽  
Zhaoyao Sa ◽  
Hong Li ◽  
Changwei Su ◽  
Ming Wu Xiang ◽  
...  
Keyword(s):  
High Capacity ◽  
Combustion Method ◽  
Lattice Parameters ◽  
Flameless Combustion ◽  
Spinel Limn2o4 ◽  
Co Doping ◽  
Jahn Teller ◽  
Limn2o4 Cathodes ◽  
Co Doped

A simple and rapid microwave-induced solution flameless combustion method to prepare high-capacity Ni-Cu co-doped spinel LiMn2O4 is provided in this work. Ni-Cu co-doping effectively reduces the lattice parameters and Jahn-Teller...

Sulfur–nitrogen co-doped porous carbon nanosheets to control lithium growth for a stable lithium metal anode

2019 ◽  
Vol 7 (31) ◽  
pp. 18267-18274 ◽  
Author(s):  
Mei Chen ◽  
Jianhui Zheng ◽  
Ouwei Sheng ◽  
Chengbin Jin ◽  
Huadong Yuan ◽  
...  
Keyword(s):  
Porous Carbon ◽  
High Capacity ◽  
Rate Capability ◽  
Lithium Metal ◽  
Capacity Retention ◽  
Carbon Nanosheets ◽  
Metal Anode ◽  
Co Doping ◽  
Lithium Metal Anode ◽  
Co Doped

Based on S, N co-doping, a full cell exhibits high capacity retention and excellent rate capability.

scholarly journals Enhancing the durable performance of LiMn2O4 at high-rate and elevated temperature by nickel-magnesium dual doping

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Yue Yu ◽  
Junming Guo ◽  
Mingwu Xiang ◽  
Changwei Su ◽  
Xiaofang Liu ◽  
...  
Keyword(s):  
Spinel Phase ◽  
Rate Capability ◽  
Combustion Method ◽  
Lattice Parameter ◽  
High Rate ◽  
Structure Stability ◽  
Lattice Contraction ◽  
Co Doping ◽  
Jahn Teller ◽  
Potential Strategy

AbstractVarious nickel and magnesium dual-doped LiNixMg0.08Mn1.92−xO4 (x ≤ 0.15) were synthesized via a modified solid-state combustion method. All as-prepared samples show typical spinel phase with a well-defined polyhedron morphology. The Ni-Mg dual-doping obviously decreases the lattice parameter that gives rise to the lattice contraction. Owing to the synergistic merits of metal ions co-doping, the optimized LiNi0.03Mg0.08Mn1.89O4 delivers high initial capacity of 115.9 and 92.9 mAh·g−1, whilst retains 77.1 and 69.7 mAh·g−1 after 1000 cycles at 1 C and high current rate of 20 C, respectively. Even at 10 C and 55 °C, the LiNi0.03Mg0.08Mn1.89O4 also has a discharge capacity of 92.2 mAh·g−1 and endures 500 cycles long-term life. Such excellent results are contributed to the fast Li+ diffusion and robust structure stability. The anatomical analysis of the 1000 long-cycled LiNi0.03Mg0.08Mn1.89O4 electrode further demonstrates the stable spinel structure via the mitigation of Jahn-Teller effect. Hence, the Ni-Mg co-doping can be a potential strategy to improve the high-rate capability and long cycle properties of cathode materials.

scholarly journals N/S co-doped CoSe/C nanocubes as anode materials for Li-ion batteries

2021 ◽  
Vol 11 (1) ◽  
pp. 244-251
Author(s):  
Lifeng Cui ◽  
Haoyu Qi ◽  
Nannan Wang ◽  
Xin Gao ◽  
Chunyu Song ◽  
...  
Keyword(s):  
Transition Metal ◽  
Anode Materials ◽  
High Capacity ◽  
Negative Electrode ◽  
Lithium Ion ◽  
High Rate ◽  
Rate Performance ◽  
Co Doping ◽  
Co Doped

Abstract The transition metal selenide can be used as a potential material for the negative electrode of lithium-ion batteries (LIBs) owing to its high density and conductivity. Unfortunately, a large volume change occurs in the transition metal selenide during the charging and discharging process, which eventually results in the poor rate performance and rapid capacity decay. In response to this, the N/S co-doped CoSe nanocubes (CoSe/C–NS) can be fabricated where the S-doped cobalt 2-methylimidazole (ZIF-67) as both sacrifice template and cobalt source to directly mix with selenium powder and followed by the annealing process. In the process, the carbon frameworks derived from ZIF-67 can establish a coating layer to protect the structure of materials, and simultaneously the N/S co-doping can enhance the conductivity and broaden the interlayer of frameworks. These can further accelerate the storage capacity and the Li+ insertion and deintercalation process. As a negative electrode material of LIBs, the CoSe/C–NS delivers the high capacity, high rate performance, and long-term cycle stability. This protocol opens up an approvable approach to fabricate efficient anode materials with persistent electrochemical stability in LIBs.

Co-doped ZnO/C composites as high capacity materials for Li storage

2019 ◽  
Vol 12 (06) ◽  
pp. 1950081 ◽  
Author(s):  
Jiawei Jin ◽  
Xuejiao Sun ◽  
Miaoqiong Xu ◽  
Shaoyun Chen ◽  
Wenjie Chen ◽  
...  
Keyword(s):  
Anode Materials ◽  
High Capacity ◽  
Diffusion Path ◽  
Li Ion Batteries ◽  
Co Doping ◽  
Li Ion ◽  
Doped Zno ◽  
C Complex ◽  
Intense Heat ◽  
Co Doped

Co-doped ZnO/C composites derived from Co-doped MOF-5 were applied as the anode materials for Li-ion batteries (LIBs), which showed advanced capacity and rate performance. Their good electrochemical properties were attributed to the Co-doping and C complex which greatly enhance ZnO electrical conductivity, and the microporous and macroporous structure which augments the contact area between electrolyte and electrode shortening the diffusion path of Li ions as well as releasing the intense heat caused by Li alloying.

scholarly journals Luminescence Study of Red Light Emitting Y2O3:Sm3+ Nanophosphors and Enhancement by Co-doping with Gadolinium oxide

2021 ◽  
Vol 9 (6) ◽  
pp. 60-70
Author(s):  
Vini. K ◽  
Padmakumar H. ◽  
K.M. Nissamudeen
Keyword(s):  
Luminescence Intensity ◽  
Red Light ◽  
Optoelectronic Devices ◽  
Combustion Method ◽  
Gadolinium Oxide ◽  
Maximum Intensity ◽  
Samarium Oxide ◽  
Light Emitting ◽  
Co Doping ◽  
Co Doped

This work presents the optical and structural properties of samarium oxide doped and gadolinium oxide co-doped yttrium oxide nanophosphors prepared by Combustion method. The photoluminescence emission intensity was maximum for 2wt% Sm3+ doped Y2O3 powders, that results 4G5/2 - 6H7/2 transition within Samarium, emits red light at 608 nm under the excitation of 260 nm. In the case of co-dopant, maximum intensity is obtained for 3wt% Gd3+ under the excitation of 255 nm.The Y:Sm:Gd exhibit luminescence intensity of 4.21 times more than that of Y:Sm nanophosphors. These results indicate that the prepared nanophosphors can be used in optoelectronic devices.

Promoting Hydrogen Evolution of g-C3N4 Based Photocatalyst by Indium and Phosphorus Co-doping

2021 ◽  
Author(s):  
Xiao-Hang Yang ◽  
Chi Cao ◽  
Zilong Guo ◽  
Xiaoyu Zhang ◽  
Yaxin Wang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Post Treatment ◽  
Experimental Results ◽  
Indium Chloride ◽  
Co Doping ◽  
In Situ Copolymerization ◽  
Co Doped

Indium and phosphorus co-doped g-C3N4 photocatalyst (In,P-g-C3N4) was prepared by K2HPO4 post-treatment of indium doped g-C3N4 photocatalyst (In-g-C3N4) derived from in-situ copolymerization of dicyandiamide and indium chloride. The experimental results...

scholarly journals Cobalt-doped bioceramic scaffolds fabricated by 3D printing show enhanced osteogenic and angiogenic properties for bone repair

2021 ◽  
Vol 20 (1) ◽  
Author(s):  
Jungang Li ◽  
Chaoqian Zhao ◽  
Chun Liu ◽  
Zhenyu Wang ◽  
Zeming Ling ◽  
...  
Keyword(s):  
Compressive Strength ◽  
3D Printing ◽  
Bone Regeneration ◽  
Doping Concentration ◽  
Artificial Bone ◽  
Bone Defect Repair ◽  
Co Doping ◽  
Defect Repair ◽  
Co Doped

Abstract Background The bone regeneration of artificial bone grafts is still in need of a breakthrough to improve the processes of bone defect repair. Artificial bone grafts should be modified to enable angiogenesis and thus improve osteogenesis. We have previously revealed that crystalline Ca10Li(PO4)7 (CLP) possesses higher compressive strength and better biocompatibility than that of pure beta-tricalcium phosphate (β-TCP). In this work, we explored the possibility of cobalt (Co), known for mimicking hypoxia, doped into CLP to promote osteogenesis and angiogenesis. Methods We designed and manufactured porous scaffolds by doping CLP with various concentrations of Co (0, 0.1, 0.25, 0.5, and 1 mol%) and using 3D printing techniques. The crystal phase, surface morphology, compressive strength, in vitro degradation, and mineralization properties of Co-doped and -undoped CLP scaffolds were investigated. Next, we investigated the biocompatibility and effects of Co-doped and -undoped samples on osteogenic and angiogenic properties in vitro and on bone regeneration in rat cranium defects. Results With increasing Co-doping level, the compressive strength of Co-doped CLP scaffolds decreased in comparison with that of undoped CLP scaffolds, especially when the Co-doping concentration increased to 1 mol%. Co-doped CLP scaffolds possessed excellent degradation properties compared with those of undoped CLP scaffolds. The (0.1, 0.25, 0.5 mol%) Co-doped CLP scaffolds had mineralization properties similar to those of undoped CLP scaffolds, whereas the 1 mol% Co-doped CLP scaffolds shown no mineralization changes. Furthermore, compared with undoped scaffolds, Co-doped CLP scaffolds possessed excellent biocompatibility and prominent osteogenic and angiogenic properties in vitro, notably when the doping concentration was 0.25 mol%. After 8 weeks of implantation, 0.25 mol% Co-doped scaffolds had markedly enhanced bone regeneration at the defect site compared with that of the undoped scaffold. Conclusion In summary, CLP doped with 0.25 mol% Co2+ ions is a prospective method to enhance osteogenic and angiogenic properties, thus promoting bone regeneration in bone defect repair.

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