scholarly journals 3D Porous Ti3C2 MXene/NiCo-MOF Composites for Enhanced Lithium Storage

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 695 ◽  
Author(s):  
Yijun Liu ◽  
Ying He ◽  
Elif Vargun ◽  
Tomas Plachy ◽  
Petr Saha ◽  
...  
Keyword(s):  
High Performance ◽  
Electrode Materials ◽  
High Current Density ◽  
Composite Films ◽  
Three Dimensional ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Energy Storage Devices ◽  
Lithium Storage ◽  
Hierarchical Porous

To improve Li storage capacity and the structural stability of Ti3C2 MXene-based electrode materials for lithium-ion batteries (LIBs), a facile strategy is developed to construct three-dimensional (3D) hierarchical porous Ti3C2/bimetal-organic framework (NiCo-MOF) nanoarchitectures as anodes for high-performance LIBs. 2D Ti3C2 nanosheets are coupled with NiCo-MOF nanoflakes induced by hydrogen bonds to form 3D Ti3C2/NiCo-MOF composite films through vacuum-assisted filtration technology. The morphology and electrochemical properties of Ti3C2/NiCo-MOF are influenced by the mass ratio of MOF to Ti3C2. Owing to the interconnected porous structures with a high specific surface area, rapid charge transfer process, and Li+ diffusion rate, the Ti3C2/NiCo-MOF-0.4 electrode delivers a high reversible capacity of 402 mAh g−1 at 0.1 A g−1 after 300 cycles; excellent rate performance (256 mAh g−1 at 1 A g−1); and long-term stability with a capacity retention of 85.7% even after 400 cycles at a high current density, much higher than pristine Ti3C2 MXene. The results highlight that Ti3C2/NiCo-MOF have great potential in the development of high-performance energy storage devices.

scholarly journals Three-Dimensional Carbon-Coated LiFePO4 Cathode with Improved Li-Ion Battery Performance

Coatings ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1137
Author(s):  
Can Wang ◽  
Xunlong Yuan ◽  
Huiyun Tan ◽  
Shuofeng Jian ◽  
Ziting Ma ◽  
...  
Keyword(s):  
High Performance ◽  
Electrode Materials ◽  
Three Dimensional ◽  
High Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Economic Benefits ◽  
Synthesis Process ◽  
Carbon Coated

LiFePO4 (LFPO)has great potential as the cathode material for lithium-ion batteries; it has a high theoretical capacity (170 m·A·h·g−1), high safety, low toxicity and good economic benefits. However, low conductivity and a low diffusion rate inhibit its future development. To overcome these weaknesses, three-dimensional carbon-coated LiFePO4 that incorporates a high capacity, superior conductivity and low volume expansion enables faster electron transport channels. The use of Cetyltrimethyl Ammonium Bromid (CTAB) modification only requires a simple water bath and sintering, without the need to add a carbon source in the LFPO synthesis process. In this way, the electrode shows excellent reversible capacity, as high as 159.8 m·A·h·g−1 at 2 C, superior rate capability with 97.3 m·A·h·g−1at 5 C and good cycling ability, preserving ~84.2% capacity after 500 cycles. By increasing the ion transport rate and enhancing the structural stability of LFPO nanoparticles, the LFPO-positive electrode achieves excellent initial capacity and cycle life through cost-effective and easy-to-implement carbon coating. This simple three-dimensional carbon-coated LiFePO4 provides a new and simple idea for obtaining comprehensive and high-performance electrode materials in the field of lithium cathode materials.

scholarly journals Carbon-Coated Three-Dimensional MXene/Iron Selenide Ball with Core–Shell Structure for High-Performance Potassium-Ion Batteries

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Su Hyun Yang ◽  
Yun Jae Lee ◽  
Heemin Kang ◽  
Seung-Keun Park ◽  
Yun Chan Kang
Keyword(s):  
High Performance ◽  
Electrode Materials ◽  
High Current Density ◽  
Electronic Conductivity ◽  
Three Dimensional ◽  
Ultrasonic Spray Pyrolysis ◽  
Reversible Capacity ◽  
Potassium Ion ◽  
Synthetic Strategy ◽  
High Electronic Conductivity

AbstractTwo-dimensional (2D) MXenes are promising as electrode materials for energy storage, owing to their high electronic conductivity and low diffusion barrier. Unfortunately, similar to most 2D materials, MXene nanosheets easily restack during the electrode preparation, which degrades the electrochemical performance of MXene-based materials. A novel synthetic strategy is proposed for converting MXene into restacking-inhibited three-dimensional (3D) balls coated with iron selenides and carbon. This strategy involves the preparation of Fe2O3@carbon/MXene microspheres via a facile ultrasonic spray pyrolysis and subsequent selenization process. Such 3D structuring effectively prevents interlayer restacking, increases the surface area, and accelerates ion transport, while maintaining the attractive properties of MXene. Furthermore, combining iron selenides and carbon with 3D MXene balls offers many more sites for ion storage and enhances the structural robustness of the composite balls. The resultant 3D structured microspheres exhibit a high reversible capacity of 410 mAh g−1 after 200 cycles at 0.1 A g−1 in potassium-ion batteries, corresponding to the capacity retention of 97% as calculated based on 100 cycles. Even at a high current density of 5.0 A g−1, the composite exhibits a discharge capacity of 169 mAh g−1.

Fabrication of nitrogen-doped hierarchical porous carbons from Sargassum as advanced electrode materials for supercapacitors

2021 ◽  
Author(s):  
Feiqiang Guo ◽  
Yinbo Zhan ◽  
Xiaopeng Jia ◽  
Huiming Zhou ◽  
Shuang Liang ◽  
...  
Keyword(s):  
High Performance ◽  
Nitrogen Doping ◽  
Electrode Materials ◽  
Three Dimensional ◽  
Koh Activation ◽  
Porous Carbons ◽  
Nitrogen Doped ◽  
Novel Approach ◽  
Hierarchical Porous ◽  
Hierarchical Porous Carbons

Using Sargassum as the precursor, a novel approach was developed to synthesize three-dimensional porous carbons as high-performance electrode materials for supercapacitors via KOH activation and subsequent nitrogen-doping employing melamine as...

Porous Activity of Biomass-Activated Carbon Enhanced by Nitrogen-Dopant Towards High-Performance Lithium Ion Hybrid Battery-Supercapacitor

2021 ◽  
Author(s):  
Juan Yu ◽  
Xuyang Wang ◽  
Jiaxin Peng ◽  
Xuefeng Jia ◽  
Linbo Li ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Energy Storage ◽  
Pore Structure ◽  
High Performance ◽  
Electrode Materials ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Utilization Efficiency ◽  
Energy Storage Devices ◽  
Storage Devices

Abstract Biomass-activated carbon materials are promising electrode materials for lithium-ion hybrid capacitors (LiCs) because of their natural hierarchical pore structure. The efficient utilization of structural pores in activated carbon is very important for their electrochemical performance. Herein, porous biomass-activated carbon (PAC) with large specific surface area was prepared using a one-step activation method with biomass waste as the carbon source and ZnCl2 as the activator. To further improve its pore structure utilization efficiency, the PAC was doped with nitrogen using urea as the nitrogen source. The experimental results confirmed that PAC-1 with a high nitrogen doping level of 4.66% exhibited the most efficient pore utilization among all the samples investigated in this study. PAC-1 exhibited 92% capacity retention after 8000 cycles, showing good cycling stability. Then, to maximize the utilization of high-efficiency energy storage devices, LiNi0.8Co0.15Al0.05O2 (NCA), a promising cathode material for lithium-ion batteries with high specific capacity, was compounded with PAC-1 in different ratios to obtain NCA@PC composites. The NCA@PC-9 composite exhibited excellent capacitance in LiCs and an energy density of 210.9 Wh kg-1 at a high power density of 13.3 kW kg-1. These results provide guidelines for the design of high-performance and low-cost energy storage devices.

Large-Scale Synthesis and Lithium Storage Performance of Multilayer TiO2 Nanobelts

2019 ◽  
Vol 72 (6) ◽  
pp. 473 ◽  
Author(s):  
Zongkai Yue ◽  
Yaozu Kang ◽  
Tianyu Mao ◽  
Mengmeng Zhen ◽  
Zhiyong Wang
Keyword(s):  
Large Scale ◽  
Electrode Materials ◽  
Low Cost ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Cycling Performance ◽  
High Specific Surface Area ◽  
Cycle Life ◽  
Lithium Storage ◽  
Tio2 Nanobelts

Titanium dioxide (TiO2) has been widely investigated as the electrode material for lithium ion batteries (LIBs), due to its low cost, small volume expansion, and high environmental friendliness. However, the fading capacity and short cycle life during the cycling process lead to poor cycling performance. Herein, multilayer TiO2 nanobelts with a high specific surface area and with many pores between nanoparticles are constructed via a simple and large-scale approach. Benefiting from the multilayer nanobelt structure, as-prepared TiO2 nanobelts deliver a high reversible capacity, strong cycling stability, and ultra-long cycle life (~185mAhg−1 at 500mAg−1 after 500 cycles) as electrode materials for LIBs.

scholarly journals N-Doped Carbon Boosted the Formation of Few-Layered MoS2 for High-Performance Lithium and Sodium Storage

2021 ◽  
Vol 8 ◽  
Author(s):  
Junfeng Li ◽  
Xianzi Zhou ◽  
Kai Lu ◽  
Chao Ma ◽  
Liang Li ◽  
...  
Keyword(s):  
Current Density ◽  
High Performance ◽  
High Current Density ◽  
Low Cost ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Molybdenum Sulfide ◽  
High Current ◽  
High Theoretical Capacity ◽  
Sodium Storage

Molybdenum sulfide (MoS2) has become a potential anode of lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs) due to its high theoretical capacity and low cost. However, the volume expansion, poor electrical conductivity and dissolution of polysulfides in the electrolyte during the cycling process severely limited its applications. Herein, few-layered MoS2@N-doped carbon (F-MoS2@NC) was synthesized through a facile solvothermal and annealing process. It was found that the addition of N-doped carbon precursor could significantly promote the formation of few-layered MoS2 and improve the performances of lithium and sodium storage. A high reversible capacity of 482.6 mA h g−1 at a high current density of 2000 mA g−1 could be obtained for LIBs. When used as anode material for SIBs, F-MoS2@NC hybrids could maintain a reversible capacity of 171 mA h g−1 at a high current density of 1,000 mA g−1 after 600 cycles. This work should provide new insights into carbon hybrid anode materials for both LIBs and SIBs.

Li-ion capacitors based on activated ferric oxide as an anode

2021 ◽  
pp. 1-18
Author(s):  
Xinhui Zhao ◽  
Qingqing Ren
Keyword(s):  
High Performance ◽  
Electrode Materials ◽  
Low Cost ◽  
Solid Electrolyte Interphase ◽  
Cycling Performance ◽  
Fe2o3 Nanoparticles ◽  
Energy Storage Devices ◽  
Lithium Storage ◽  
Continuous Growth ◽  
Li Ion

Abstract Low-cost Fe-based electrode materials for Li-ion energy storage devices attract lots of attention. In this work, porous Fe2O3 nanoparticles are synthesized by a simple route. Firstly, their lithium storage performance is investigated by assembling half-cell configurations with Li foil as the counter electrode. During initial dozens of cycles, capacities of Fe2O3 nanoparticles fall off rapidly, which is related to continuous growth of solid electrolyte interphase (SEI). Amazingly, the capacities show an upturn in extended cycles. The pseudocapacitance of activated capacities is revealed by executing cyclic voltammetry (CV) tests at various scan rates on 500-cycled Fe2O3 electrodes. Based on electrochemical results, we speculate this special cycling performance of Fe2O3 nanoparticles may be associated with reversible electrochemical processes of SEI under the catalysis of nano-size Fe. Further, 500-cycled Fe2O3 anodes are reassembled with activated carbon cathodes for Li-ion capacitors (LICs). The LICs show energy densities of 110 Wh kg−1 at power densities of 136 W kg−1, and 72.8% capacity retention after 3000 cycles at 2 A g−1. We report an interesting electrochemical behavior of porous Fe2O3 nanoparticles, and a high-performance LIC based on activated Fe2O3 as an anode. This work may offer a new understanding for lithium storage capacities of metal oxide anodes.

Facile Synthesis of Polypyrrole Nanofibers/Co-MOF Composite and Its Lithium Storage Properties

2020 ◽  
Vol 12 (4) ◽  
pp. 486-491
Author(s):  
Jinlei Wang ◽  
Na Cao ◽  
Huiling Du ◽  
Xian Du ◽  
Hai Lu ◽  
...  
Keyword(s):  
Electrode Materials ◽  
Rate Capability ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Cycling Performance ◽  
Charge Transfer Resistance ◽  
Growth Strategy ◽  
Composite Electrodes ◽  
Lithium Storage ◽  
Transfer Resistance

Metal-organic frameworks (MOFs) have recently emerged as promising electrode materials for lithium-ion batteries (LIBs). However, poor electrical conductivity in most MOFs limits their electrochemical performance. In this work, the integration of flaky cobalt 1,4-benzenedicarboxylate (Co-BDC) MOF with conductive polypyrrole (PPy) nanofibers via in-situ growth strategy was explored for developing novel anode materials for LIBs. Electrochemical studies showed that PPy/Co-BDC composites exhibited enhanced cycling performance (a reversible capacity of ca. 364 mA h g–1 at a current density of 50 mA g–1 after 100 cycles) and rate capability, com- pared with the pristine Co-BDC. The well dispersion of Co-BDC on polypyrrole nanofibers and the decrease in charge-transfer resistance of the composite electrodes accounted for the improvement of electrochemical properties.

Hierarchical porous nitrogen-rich carbon monoliths via ice-templating: high capacity and high-rate performance as lithium-ion battery anode materials

2014 ◽  
Vol 2 (42) ◽  
pp. 17787-17796 ◽  
Author(s):  
Aled D. Roberts ◽  
Suxi Wang ◽  
Xu Li ◽  
Haifei Zhang
Keyword(s):  
High Current Density ◽  
High Capacity ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Carbon Composite ◽  
High Rate ◽  
Carbon Monolith ◽  
Hierarchical Porous ◽  
High Rate Performance ◽  
Ice Templating

Ice-templating is utilized to prepare hierarchically porous carbon monolith with aligned macropores. N-doped and graphene-incorporated carbon composite can be easily produced, demonstrating a reversible capacity of about 300 mA h g−1 at a high current density of 10 A g−1.

scholarly journals 3D Flower-Like Hierarchitectures Constructed by SnS/SnS2Heterostructure Nanosheets for High-Performance Anode Material in Lithium-Ion Batteries

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Zhiguo Wu ◽  
Fengyi Wang ◽  
Shiyong Zuo ◽  
Shuankui Li ◽  
Baisong Geng ◽  
...  
Keyword(s):  
Lithium Batteries ◽  
Anode Materials ◽  
High Performance ◽  
Three Dimensional ◽  
High Capacity ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
One Pot ◽  
Long Cycle Life ◽  
20 Nm

Sn chalcogenides, including SnS, Sn2S3, and SnS2, have been extensively studied as anode materials for lithium batteries. In order to obtain one kind of high capacity, long cycle life lithium batteries anode materials, three-dimensional (3D) flower-like hierarchitectures constructed by SnS/SnS2heterostructure nanosheets with thickness of ~20 nm have been synthesized via a simple one-pot solvothermal method. The obtained samples exhibit excellent electrochemical performance as anode for Li-ion batteries (LIBs), which deliver a first discharge capacity of 1277 mAhg−1and remain a reversible capacity up to 500 mAhg−1after 50 cycles at a current of 100 mAg−1.

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