A novel ferrocene-containing aniline copolymer: its synthesis and electrochemical performance

RSC Advances ◽  
2015 ◽  
Vol 5 (18) ◽  
pp. 14053-14060 ◽  
Author(s):  
Chang Su ◽  
Lvlv Ji ◽  
Lihuan Xu ◽  
Xiaogang Zhu ◽  
Huihui He ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Specific Capacity ◽  
Potential Range ◽  
The Novel ◽  
Discharge Specific Capacity ◽  
Initial Discharge

The novel ferrocene-contained aniline based polymers were successfully synthesized, which demonstrated an improved discharge plateau at the potential range of about 3.0–4.0 V, as with the acceptable initial discharge specific capacity.

Synthesis and Electrochemical Performance of Silicon/Carbon Composite Anodes through Ball Milling and Spray Drying Pyrolysis Process

2018 ◽  
Vol 914 ◽  
pp. 56-63
Author(s):  
Ying Wang ◽  
Hao Wu ◽  
Fang Ming Xiao ◽  
Ren Heng Tang ◽  
Tai Sun
Keyword(s):  
Electron Microscopy ◽  
Electrochemical Performance ◽  
Ball Milling ◽  
Spray Drying ◽  
Amorphous Carbon ◽  
Specific Capacity ◽  
Constant Current ◽  
Graphite Composite ◽  
Discharge Specific Capacity ◽  
Composite Anodes

A facile method was developed to synthesize amorphous carbon coated nano-sized silicon and graphite by using glucose or pitch as organic carbon source, nano-sized silicon particles were uniformly coated onto the artificial graphite by combined ball milling and spray drying pyrolysis, and the effect of binder types, binder amounts on the precursor morphology, feed rate and spray pressure on the electrochemical performance were investigated in detail. The partial size, surface morphology and electrochemical performances of the as-synthesized powders were analyzed by particulate size description analyzer (PSDA), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and constant current charge/discharge tools. It is found that, citric acid and binder are important for improving the free-aggregation of nano-sized silicon and the morphologyof combined silicon and graphite. Therefore, under the optimal experimental conditions, amorphous carbon from pitch coated nano-sized silicon and graphite composite anodes exhibits much higher electrochemical performance. It can deliver the first discharge specific capacity of 796.3mA·h/g at a current density of 100 mA/g, as well as 85% of initial coulombic efficiency. Additionally, the discharge specific capacity retains 724.9mA·h/g, and the discharge capacity retention of a half cell system is 91% after 50 cycles.

scholarly journals Exploring the Role of Crystal Water in Potassium Manganese Hexacyanoferrate as a Cathode Material for Potassium-Ion Batteries

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 895
Author(s):  
Polina A. Morozova ◽  
Ivan A. Trussov ◽  
Dmitry P. Rupasov ◽  
Victoria A. Nikitina ◽  
Artem M. Abakumov ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Chemical Composition ◽  
Electrochemical Performance ◽  
Structural Model ◽  
Electrode Materials ◽  
Iron Oxidation ◽  
Specific Capacity ◽  
Potassium Ion ◽  
Potential Range ◽  
Crystal Water

The Prussian Blue analogue K2−δMn[Fe(CN)6]1−ɣ∙nH2O is regarded as a key candidate for potassium-ion battery positive electrode materials due to its high specific capacity and redox potential, easy scalability, and low cost. However, various intrinsic defects, such as water in the crystal lattice, can drastically affect electrochemical performance. In this work, we varied the water content in K2−δMn[Fe(CN)6]1−ɣ∙nH2O by using a vacuum/air drying procedure and investigated its effect on the crystal structure, chemical composition and electrochemical properties. The crystal structure of K2−δMn[Fe(CN)6]1−ɣ∙nH2O was, for the first time, Rietveld-refined, based on neutron powder diffraction data at 10 and 300 K, suggesting a new structural model with the Pc space group in accordance with Mössbauer spectroscopy. The chemical composition was characterized by thermogravimetric analysis combined with mass spectroscopy, scanning transmission electron microscopy microanalysis and infrared spectroscopy. Nanosized cathode materials delivered electrochemical specific capacities of 130–134 mAh g−1 at 30 mA g−1 (C/5) in the 2.5–4.5 V (vs. K+/K) potential range. Diffusion coefficients determined by potentiostatic intermittent titration in a three-electrode cell reached 10−13 cm2 s−1 after full potassium extraction. It was shown that drying triggers no significant changes in crystal structure, iron oxidation state or electrochemical performance, though the water level clearly decreased from the pristine to air- and vacuum-dried samples.

Microstructure and electrochemical performance of LiFePO4 cathode materials modified with binuclear metal aminophthalocyanines

2018 ◽  
Vol 22 (12) ◽  
pp. 1072-1081 ◽  
Author(s):  
Yuanyuan Su ◽  
Feifei Xu ◽  
Ruiqiong Wang ◽  
Ronglan Zhang ◽  
Jianshe Zhao
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Electrode Materials ◽  
Preparation Method ◽  
Solvothermal Method ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Initial Discharge ◽  
Lifepo4 Cathode ◽  
Binuclear Metal

The monodispersed LiFe[Formula: see text]M[Formula: see text]PO4/C [[Formula: see text] [Formula: see text] 0.0040; [Formula: see text] = Mn[Formula: see text], Co[Formula: see text], Ni[Formula: see text], Cu[Formula: see text], Zn[Formula: see text]] nanocomposites obtained by LiFePO4 modified with binuclear metal aminophthalocyanines (M2(PcTa)2O and M2(PcTa)2C(CF[Formula: see text] are utilized as positive electrode materials for lithium ion batteries. The preparation method for these nanocomposites is a controllable solvothermal method using a mixture of ethylene glycol and [Formula: see text],[Formula: see text]-dimethylformamide as the solvent. The microstructure and electrochemical properties of the different nanocomposites are discussed and compared. The results show that the LiFePO4 samples modified with M2(PcTa)2C(CF[Formula: see text]can improve the initial discharge specific capacity of the lithium ion battery up to 154.2 mAh.g[Formula: see text]at the rate of 0.1 C, and 93.5% of the initial discharge capacity could be retained after 50 cycles. This research shows that the proposed process can enhance the electrochemical performance of high power LiFePO4 for lithium ion batteries.

Study on Preparation of Si/C Anode Material by Spray Dying and Carbonization

2016 ◽  
Vol 852 ◽  
pp. 928-934 ◽  
Author(s):  
Fang Ming Xiao ◽  
Guo Ge Peng ◽  
Ying Wang ◽  
Ren Heng Tang ◽  
Zhi Ping Xiao ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Current Density ◽  
Raw Materials ◽  
Coulombic Efficiency ◽  
Specific Capacity ◽  
Constant Current ◽  
Artificial Graphite ◽  
Discharge Specific Capacity ◽  
Constant Current Charge ◽  
Morphology Characterization

Si/C composites were prepared by spray dying and carbonization process using silica powder, artificial graphite and glucose as raw materials. The physicochemical property and electrochemical performance of composite materials were characterized by XRD, SEM, constant current charge-discharge and cyclic voltammeter (CA) test, respectively. The results show that composite anode materials have pure phase structure with particle size of 5~20μm, and its special structure that silicon and graphite particles are constructed can exhibit good electrochemical performance. The initial discharge specific capacity of Si/C composites is 1033.2mAhg-1 at a current density of 100mAg-1.While the current density is as high as 600mAg-1, the discharge specific capacity is 584.2mAhg-1, and the first cycle coulombic efficiency is 77.3% at 100mAg-1.The mechanism of capacity fading of Si/C composites is discussed by different morphology characterization after 100 cycles.

scholarly journals Li2S encapsulated by nitrogen-doped carbon for lithium sulfur batteries

2014 ◽  
Vol 2 (42) ◽  
pp. 18026-18032 ◽  
Author(s):  
Lin Chen ◽  
Yuzi Liu ◽  
Maziar Ashuri ◽  
Caihong Liu ◽  
Leon L. Shaw
Keyword(s):  
Specific Capacity ◽  
Carbon Shell ◽  
Composite Particles ◽  
Nitrogen Doped ◽  
Discharge Specific Capacity ◽  
Initial Discharge ◽  
Lithium Sulfur Batteries ◽  
Nitrogen Doped Carbon ◽  
Lithium Sulfur

The procedure for the synthesis of Li2S/C composite particles encapsulated by a nitrogen-doped carbon shell, which exhibit the highest initial discharge specific capacity ever reported in the literature.

Study on the Electrochemical Performance of High Tap Density LiFePO4/C Synthesized by Spray-Drying

2014 ◽  
Vol 893 ◽  
pp. 60-63 ◽  
Author(s):  
Cheng Lu ◽  
Lin Chen ◽  
Yi Jie Gu ◽  
Yun Bo Chen ◽  
Meng Wang ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Electrochemical Properties ◽  
Red Blood Cells ◽  
Spray Drying ◽  
Blood Cells ◽  
Raw Materials ◽  
Specific Capacity ◽  
Conductive Additive ◽  
Initial Discharge ◽  
Tap Density

LiFePO4/C materials were synthesized by spray-drying using FePO4·2H2O, LiOH·H2O as raw materials, glucose as reducing agent and conductive additive. The morphology, structure and electrochemical properties of the LiFePO4/C were tested and analyzed. The morphology of the LiFePO4/C was biconcave and round looked similar to red blood cells, the tap density of the material up to 1.45g/cm3. The electrochemical performance of the material was excellent. The LiFePO4/C had an initial discharge specific capacity of 161.8mAh/g at rate of 0.1C and its specific capacities were 148.7, 120.9mAh/g at rates of 1, 5C rate, respectively. The discharge capacity remained at 95.8%, 81.7% after 500, 1000 cycles respectively at rate of 5C.

scholarly journals Effect of Ni Doping Content on Phase Transition and Electrochemical Performance of TiO2 Nanofibers Prepared by Electrospinning Applied for Lithium-Ion Battery Anodes

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1302
Author(s):  
Danning Kang ◽  
Jun Li ◽  
Yuyao Zhang
Keyword(s):  
Electrochemical Performance ◽  
Current Density ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Doping Content ◽  
Ni Doping ◽  
Tio2 Nanofibers ◽  
Initial Discharge ◽  
Theoretical Specific Capacity ◽  
A Current

Titanium dioxide (TiO2), as a potential anode material applied for lithium-ion batteries (LIBs), is constrained due to its poor theoretical specific capacity (335 mAh·g−1) and low conductivity (10−7-10−9 S·cm−1). When compared to TiO2, NiO with a higher theoretical specific capacity (718 mAh·g−1) is regarded as an alternative dopant for improving the specific capacity of TiO2. The present investigations usually assemble TiO2 and NiO with a simple bilayer structure and without NiO that is immersed into the inner of TiO2, which cannot fully take advantage of NiO. Therefore, a new strategy was put forward to utilize the synergistic effect of TiO2 and NiO, namely doping NiO into the inner of TiO2. NiO-TiO2 was fabricated into the nanofibers with a higher specific surface area to further improve their electrochemical performance due to the transportation path being greatly shortened. NiO-TiO2 nanofibers are expected to replace of the commercialized anode material (graphite). In this work, a facile one-step electrospinning method, followed by annealing, was applied to synthesize the Ni-doped TiO2 nanofibers. The Ni doping content was proven to be a crucial factor affecting phase constituents, which further determined the electrochemical performance. When the Ni doping content was less than 3 wt.%, the contents of anatase and NiO were both increased, while the rutile content was decreased in the nanofibers. When the Ni doping content exceeded 3 wt.%, the opposite changes were observed. Hence, the optimum Ni doping content was determined as 3 wt.%, at which the highest weight fractions of anatase and NiO were obtained. Correspondingly, the obtained electronic conductivity of 4.92 × 10−5 S⋅cm−1 was also the highest, which was approximately 1.7 times that of pristine TiO2. The optimal electrochemical performance was also obtained. The initial discharge and charge specific capacity was 576 and 264 mAh·g−1 at a current density of 100 mA·g−1. The capacity retention reached 48% after 100 cycles, and the coulombic efficiency was about 100%. The average discharge specific capacity was 48 mAh·g−1 at a current density of 1000 mA·g−1. Approximately 65.8% of the initial discharge specific capacity was retained when the current density was recovered to 40 mA·g−1. These excellent electrochemical results revealed that Ni-doped TiO2 nanofibers could be considered to be promising anode materials for LIBs.

Surface Modification of LiCo1/3Ni1/3Mn1/3O2 with LaF3 for Lithium-Ion Batteries

2011 ◽  
Vol 399-401 ◽  
pp. 1515-1518
Author(s):  
Zhan Xu Yang ◽  
Qing Dong Qiao
Keyword(s):  
Coating Layer ◽  
Specific Capacity ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
Galvanostatic Charge ◽  
X Ray ◽  
Discharge Specific Capacity ◽  
Initial Discharge ◽  
Surface Modified ◽  
Charge Discharge

LiCo1/3Ni1/3Mn1/3O2 has been modified with LaF3. The surface modified materials were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and galvanostatic charge-discharge cycling. The LaF3-coated LiCo1/3Ni1/3Mn1/3O2 had an initial discharge specific capacity of 178.0 mAh•g–1 within the potential ranges 2.75–4.5 V (vs. Li+/Li), and its discharge specific capacity is 168.7 mAh•g–1 after 50 cycles, much higher than that of the pristine LiCo1/3Ni1/3Mn1/3O2 (148.4 mAh•g–1). The improvement could be attributed to the LaF3 coating layer that hinders interaction between LiCo1/3Ni1/3Mn1/3O2 and electrolyte and stabilizes the structure of LiCo1/3Ni1/3Mn1/3O2 .

Preparation and Electrochemical Properties of Si@C/Graphite Composite as Anode for Lithium-Ion Batteries

2019 ◽  
Vol 807 ◽  
pp. 74-81
Author(s):  
Ying Wang ◽  
Wei Ruan ◽  
Ren Heng Tang ◽  
Fang Ming Xiao ◽  
Tai Sun ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Electrochemical Properties ◽  
Lithium Ion Batteries ◽  
Retention Rate ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Capacity Retention ◽  
Graphite Composite ◽  
Discharge Specific Capacity ◽  
Enhanced Electrochemical Performance

In this study, Si@C/Graphite composite anodes were synthesized through spray drying and pyrolysis using silica, artificial graphite, and two kinds of organics (phenolic resin or pitch). The Si@PR-C/Graphite exhibits enhanced electrochemical performance for lithium-ion batteries. The first charge-discharge specific capacity is 512.8mAh/g and 621.8mAh/g, respectively, the initial coulombic efficiency is 82.5% at 100mA/g, and its capacity retention rate reached as high as 85.4% with the capacity fade rate of less than 0.18% per cycle after 85 cycles. The Si@PI-C/Graphite also presents excellent discharge specific capacity of 702.8mAh/g with the capacity retention rate of 76.9% after 30 cycles. Mechanisms for high electrochemical performances of the Si@C/Graphite composite anode are discussed. It found that the enhanced electrochemical performance due to the formation of core/shell microstructure. These encouraging experimental results suggest that proper organic carbon source has great potential for improvement of electrochemical properties of pure silicon as anode. Key words:lithium-ion batteries; anode; Si@C/Graphite composite; electrochemical performance

Influences of Precursor’s Processing Method on the Electrochemical Properties of Synthesized Lithium Vanadium Phosphate

2013 ◽  
Vol 724-725 ◽  
pp. 1071-1074
Author(s):  
Dao Wu Shuang Shi ◽  
Zheng Zhang ◽  
Hong Yuan Zhao ◽  
Xin Quan Liu
Keyword(s):  
Particle Size ◽  
Electrochemical Properties ◽  
Retention Rate ◽  
Hydrothermal Process ◽  
Specific Capacity ◽  
Lithium Vanadium Phosphate ◽  
Electrochemical Performances ◽  
Capacity Retention ◽  
Discharge Specific Capacity ◽  
Initial Discharge

Li3V2(PO4)3/C composite cathode material was synthesized by solid state method using LiOH•H2O, NH4H2PO4, NH4VO3 as raw materials, sucrose as carbon source, and two kinds of precursor’s treatment such as pre-sintering and hydrothermal methods. The effect of different precursor’s treatment methods on the electrochemical properties of the material was investigated. The results showed that the samples treated with hydrothermal process has smaller particle size and the initial discharge specific capacity of 119mAh/g, the capacity retention rate is 85% after 20 cycles. But the samples treated with pre-sintering (without hydrothermal process) has larger particle size and the initial discharge specific capacity 103.2mAh/g, the capacity retention rate is only 72% after 20 cycles. These results can be attributed to that the hydrothermally treated sample has smaller particle sizes, higher conductivity and shorter distances of lithium ion diffusion and electron mobility, thus the electrochemical performances are improved.

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