scholarly journals Utilizing the Intrinsic Thermal Instability of Swedenborgite Structured YBaCo4O7+δ as an Opportunity for Material Engineering in Lithium-Ion Batteries by Er and Ga Co-Doping Processes

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4565
Author(s):  
Sanghyuk Park ◽  
Kwangho Park ◽  
Ji-Seop Shin ◽  
Gyeongbin Ko ◽  
Wooseok Kim ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Phase Stability ◽  
Electrochemical Impedance ◽  
Coulombic Efficiency ◽  
Structural Phase ◽  
Active Material ◽  
Rate Capability ◽  
Lithium Ion ◽  
Ion Migration ◽  
Co Doping

We firstly introduce Er and Ga co-doped swedenborgite-structured YBaCo4O7+δ (YBC) as a cathode-active material in lithium-ion batteries (LIBs), aiming at converting the phase instability of YBC at high temperatures into a strategic way of enhancing the structural stability of layered cathode-active materials. Our recent publication reported that Y0.8Er0.2BaCo3.2Ga0.8O7+δ (YEBCG) showed excellent phase stability compared to YBC in a fuel cell operating condition. By contrast, the feasibility of the LiCoO2 (LCO) phase, which is derived from swedenborgite-structured YBC-based materials, as a LIB cathode-active material is investigated and the effects of co-doping with the Er and Ga ions on the structural and electrochemical properties of Li-intercalated YBC are systemically studied. The intrinsic swedenborgite structure of YBC-based materials with tetrahedrally coordinated Co2+/Co3+ are partially transformed into octahedrally coordinated Co3+, resulting in the formation of an LCO layered structure with a space group of R-3m that can work as a Li-ion migration path. Li-intercalated YEBCG (Li[YEBCG]) shows effective suppression of structural phase transition during cycling, leading to the enhancement of LIB performance in Coulombic efficiency, capacity retention, and rate capability. The galvanostatic intermittent titration technique, cyclic voltammetry and electrochemical impedance spectroscopy are performed to elucidate the enhanced phase stability of Li[YEBCG].

SiO2@NiO core–shell nanocomposites as high performance anode materials for lithium-ion batteries

RSC Advances ◽  
2015 ◽  
Vol 5 (77) ◽  
pp. 63012-63016 ◽  
Author(s):  
Yourong Wang ◽  
Wei Zhou ◽  
Liping Zhang ◽  
Guangsen Song ◽  
Siqing Cheng
Keyword(s):  
Lithium Ion Batteries ◽  
Anode Materials ◽  
High Performance ◽  
Coulombic Efficiency ◽  
Rate Capability ◽  
Lithium Ion ◽  
Cycling Stability ◽  
Core Shell ◽  
Excellent Cycling Stability

A SiO2@NiO core–shell electrode exhibits almost 100% coulombic efficiency, excellent cycling stability and rate capability after the first few cycles.

Electrochemical Properties of Carbon-Coated NbO2 as a Negative Electrode for Lithium-Ion Batteries

2016 ◽  
Vol 724 ◽  
pp. 87-91 ◽  
Author(s):  
Chang Su Kim ◽  
Yong Hoon Cho ◽  
Kyoung Soo Park ◽  
Soon Ki Jeong ◽  
Yang Soo Kim
Keyword(s):  
Electrochemical Properties ◽  
Lithium Ion Batteries ◽  
Ball Milling ◽  
Carbon Coating ◽  
Electrochemical Impedance ◽  
Active Material ◽  
Negative Electrode ◽  
Lithium Ion ◽  
Transfer Resistance ◽  
Carbon Coated

We investigated the electrochemical properties of carbon-coated niobium dioxide (NbO2) as a negative electrode material for lithium-ion batteries. Carbon-coated NbO2 powders were synthesized by ball-milling using carbon nanotubes as the carbon source. The carbon-coated NbO2 samples were of smaller particle size compared to the pristine NbO2 samples. The carbon layers were coated non-uniformly on the NbO2 surface. The X-ray diffraction patterns confirmed that the inter-layer distances increased after carbon coating by ball-milling. This lead to decreased charge-transfer resistance, confirmed by electrochemical impedance spectroscopy, allowing electrons and lithium-ions to quickly transfer between the active material and electrolyte. Electrochemical performance, including capacity and initial coulombic efficiency, was therefore improved by carbon coating by ball-milling.

LaPO4-coated Li1.2Mn0.56Ni0.16Co0.08O2 as a cathode material with enhanced coulombic efficiency and rate capability for lithium ion batteries

RSC Advances ◽  
2015 ◽  
Vol 5 (94) ◽  
pp. 77324-77331 ◽  
Author(s):  
Qingliang Xie ◽  
Chenhao Zhao ◽  
Zhibiao Hu ◽  
Qi Huang ◽  
Cheng Chen ◽  
...  
Keyword(s):  
Cathode Material ◽  
Lithium Ion Batteries ◽  
Coulombic Efficiency ◽  
Rate Capability ◽  
Lithium Ion ◽  
Combustion Method ◽  
Chemical Precipitation ◽  
Porous Microspheres

Layered Li[Li0.2Mn0.56Ni0.16Co0.08]O2 porous microspheres have been successfully synthesized by a urea combustion method, and then coated with appropriate amount of LaPO4via a facile chemical precipitation route.

Synthesis and Electrochemical Performance of SnO2/Graphene Hybrid Anode for Lithium Ion Batteries

2013 ◽  
Vol 1540 ◽  
Author(s):  
Chia-Yi Lin ◽  
Chien-Te Hsieh ◽  
Ruey-Shin Juang
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Anode Material ◽  
High Performance ◽  
Coulombic Efficiency ◽  
Rate Capability ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Cycling Performance ◽  
Homogeneous Distribution

ABSTRACTAn efficient microwave-assisted polyol (MP) approach is report to prepare SnO2/graphene hybrid as an anode material for lithium ion batteries. The key factor to this MP method is to start with uniform graphene oxide (GO) suspension, in which a large amount of surface oxygenate groups ensures homogeneous distribution of the SnO2 nanoparticles onto the GO sheets under the microwave irradiation. The period for the microwave heating only takes 10 min. The obtained SnO2/graphene hybrid anode possesses a reversible capacity of 967 mAh g-1 at 0.1 C and a high Coulombic efficiency of 80.5% at the first cycle. The cycling performance and the rate capability of the hybrid anode are enhanced in comparison with that of the bare graphene anode. This improvement of electrochemical performance can be attributed to the formation of a 3-dimensional framework. Accordingly, this study provides an economical MP route for the fabrication of SnO2/graphene hybrid as an anode material for high-performance Li-ion batteries.

scholarly journals Improved Electrochemical Performance of Li1.25Ni0.2Co0.333Fe0.133Mn0.333O2 Cathode Material Synthesized by the Polyvinyl Alcohol Auxiliary Sol-Gel Process for Lithium-Ion Batteries

2018 ◽  
Vol 2018 ◽  
pp. 1-7
Author(s):  
He Wang ◽  
Mingning Chang ◽  
Yonglei Zheng ◽  
Ningning Li ◽  
Siheng Chen ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Cathode Material ◽  
Discharge Capacity ◽  
Electrochemical Impedance ◽  
Coulombic Efficiency ◽  
Sol Gel ◽  
Rate Capability ◽  
Lithium Ion ◽  
Transfer Resistance ◽  
Sol Gel Process

A lithium-rich manganese-based cathode material, Li1.25Ni0.2Co0.333Fe0.133Mn0.333O2, was prepared using a polyvinyl alcohol (PVA)-auxiliary sol-gel process using MnO2 as a template. The effect of the PVA content (0.0–15.0 wt%) on the electrochemical properties and morphology of Li1.25Ni0.2Co0.333Fe0.133Mn0.333O2 was investigated. Analysis of Li1.25Ni0.2Co0.333Fe0.133Mn0.333O2 X-ray diffraction patterns by RIETAN-FP program confirmed the layered α-NaFeO2 structure. The discharge capacity and coulombic efficiency of Li1.25Ni0.2Co0.333Fe0.133Mn0.333O2 in the first cycle were improved with increasing PVA content. In particular, the best material reached a first discharge capacity of 206.0 mAhg−1 and best rate capability (74.8 mAhg−1 at 5 C). Meanwhile, the highest capacity retention was 87.7% for 50 cycles. Finally, electrochemical impedance spectroscopy shows that as the PVA content increases, the charge-transfer resistance decreases.

Prussian blue analogues Mn[Fe(CN)6]0.6667·nH2O cubes as an anode material for lithium-ion batteries

2015 ◽  
Vol 44 (38) ◽  
pp. 16746-16751 ◽  
Author(s):  
Peixun Xiong ◽  
Guojin Zeng ◽  
Lingxing Zeng ◽  
Mingdeng Wei
Keyword(s):  
Prussian Blue ◽  
Lithium Ion Batteries ◽  
Anode Material ◽  
Coulombic Efficiency ◽  
Rate Capability ◽  
Lithium Ion ◽  
Prussian Blue Analogues ◽  
Li Ion ◽  
Ion Intercalation ◽  
Good Rate Capability

Prussian blue analogues, Mn[Fe(CN)6]0.6667·nH2O cubes, were synthesized and exhibited a large capacity, good rate capability and cycling stability with a high Coulombic efficiency for Li-ion intercalation.

In Situ Synthesis of Graphitized-Carbon Coated Li4Ti5O12/C Anode for High-Rate Lithium Ion Batteries

2015 ◽  
Vol 814 ◽  
pp. 358-364
Author(s):  
Peng Xiao Huang ◽  
Shui Hua Tang ◽  
Hui Peng ◽  
Xing Li
Keyword(s):  
Lithium Ion Batteries ◽  
Electrochemical Impedance ◽  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
High Rate ◽  
Phase Method ◽  
Electrochemical Performances ◽  
Graphitized Carbon ◽  
Carbon Coated

Graphitized-Carbon coated Li4Ti5O12/C (Li4Ti5O12/GC) composites were prepared from Li2CO3, TiO2 and aromatic resorcinol via a facile rheological phase method. The microstructure and morphology of the samples were determined by XRD and SEM. The electrochemical performances of the samples were characterized by galvanostatic charge-discharge test and electrochemical impedance spectroscopy (EIS). The results reveal that the coating of graphitized carbon could effectively enhance the charge/transfer kinetics of the Li4Ti5O12 electrode. The Li4Ti5O12/GC could deliver a discharge specific capacity of 166 mAh/g at 0.2 C, 148 mAh/g at 1.0 C, 142 mAh/g at 3.0 C, 138 mAh/g at 5.0 C and 127 mAh/g at 10.0 C, respectively, and it still could remain at 132 mAh/g after cycled at 5.0 C for 100 cycles. The excellent rate capability of the Li4Ti5O12/C makes it a promising anode material for high rate lithium ion batteries.

scholarly journals Characterization and Laser Structuring of Aqueous Processed Li(Ni0.6Mn0.2Co0.2)O2 Thick-Film Cathodes for Lithium-Ion Batteries

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1840
Author(s):  
Penghui Zhu ◽  
Jiahao Han ◽  
Wilhelm Pfleging
Keyword(s):  
Acetic Acid ◽  
Lithium Ion Batteries ◽  
Thick Film ◽  
Active Material ◽  
Rate Capability ◽  
Lithium Ion ◽  
Ph Values ◽  
Laser Structuring ◽  
Methyl Pyrrolidone ◽  
High Processing

Lithium-ion batteries have led the revolution in portable electronic devices and electrical vehicles due to their high gravimetric energy density. In particular, layered cathode material Li(Ni0.6Mn0.2Co0.2)O2 (NMC 622) can deliver high specific capacities of about 180 mAh/g. However, traditional cathode manufacturing involves high processing costs and environmental issues due to the use of organic binder polyvinylidenfluoride (PVDF) and highly toxic solvent N-methyl-pyrrolidone (NMP). In order to overcome these drawbacks, aqueous processing of thick-film NMC 622 cathodes was studied using carboxymethyl cellulose and fluorine acrylic hybrid latex as binders. Acetic acid was added during the mixing process to obtain slurries with pH values varying from 7.4 to 12.1. The electrode films could be produced with high homogeneity using slurries with pH values smaller than 10. Cyclic voltammetry measurements showed that the addition of acetic acid did not affect the redox reaction of active material during charging and discharging. Rate capability tests revealed that the specific capacities with higher slurry pH values were increased at C-rates above C/5. Cells with laser structured thick-film electrodes showed an increase in capacity by 40 mAh/g in comparison to cells with unstructured electrodes.

MoS2 Layers Decorated RGO Composite Prepared by a One-Step High-Temperature Solvothermal Method as Anode for Lithium-Ion Batteries

NANO ◽  
2018 ◽  
Vol 13 (11) ◽  
pp. 1850135 ◽  
Author(s):  
Xuehua Liu ◽  
Bingning Wang ◽  
Jine Liu ◽  
Zhen Kong ◽  
Binghui Xu ◽  
...  
Keyword(s):  
High Temperature ◽  
Lithium Ion Batteries ◽  
Active Material ◽  
Rate Capability ◽  
Lithium Ion ◽  
Cost Effective ◽  
Reversible Capacity ◽  
Reduced Graphene ◽  
One Step ◽  
Anode Active Material

A one-step high-temperature solvothermal approach to the synthesis of monolayer or bilayer MoS2 anchored onto reduced graphene oxide (RGO) sheet (denoted as MoS2/RGO) is described. It was found that single-layered or double-layered MoS2 were synthesized directly without an extra exfoliation step and well dispersed on the surface of crumpled RGO sheets with random orientation. The prepared MoS2/RGO composites delivered a high reversible capacity of 900[Formula: see text]mAhg[Formula: see text] after 200 cycles at a current density of 200[Formula: see text]mAg[Formula: see text] as well as good rate capability as anode active material for lithium ion batteries. This one-step high-temperature hydrothermal strategy provides a simple, cost-effective and eco-friendly way to the fabrication of exfoliated MoS2 layers deposited onto RGO sheets.

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