scholarly journals High Tap Density SphericalLi[Ni0.5Mn0.3Co0.2]O2Cathode Material Synthesized via Continuous Hydroxide Coprecipitation Method for Advanced Lithium-Ion Batteries

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Shunyi Yang ◽  
Xianyou Wang ◽  
Xiukang Yang ◽  
Ziling Liu ◽  
Qiliang Wei ◽  
...  
Keyword(s):  
Size Distribution ◽  
Photoelectron Spectroscopy ◽  
Rate Capability ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
Voltage Range ◽  
X Ray ◽  
Tap Density ◽  
Plate Shape ◽  
Hydroxide Coprecipitation

Spherical[Ni0.5Mn0.3Co0.2](OH)2precursor with narrow size distribution and high tap density has been successfully synthesized by a continuous hydroxide coprecipitation, andLi[Ni0.5Mn0.3Co0.2]O2is then prepared by mixing the precursor with 6% excessLi2CO3followed by calcinations. The tap density of the obtainedLi[Ni0.5Mn0.3Co0.2]O2powder is as high as 2.61 g cm−3. The powders are characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), particle size distribution (PSD), and charge/discharge cycling. The XRD studies show that the preparedLi[Ni0.5Mn0.3Co0.2]O2has a well-ordered layered structure without any impurity phases. Good packing properties of spherical secondary particles (about 12 μm) consisted of a large number of tiny-thin plate-shape primary particles (less than 1 μm), which can be identified from the SEM observations. In the voltage range of 3.0–4.3 V and 2.5–4.6 V,Li[Ni0.5Mn0.3Co0.2]O2delivers the initial discharge capacity of approximately 175 and 214 mAh g−1at a current density of 32 mA g−1, and the capacity retention after 50 cycles reaches 98.8% and 90.2%, respectively. Besides, it displays good high-temperature characteristics and excellent rate capability.

Synthesis, Structure and Electronic Properties of Li4Ti5O12 Anode Material for Lithium Ion Batteries

2018 ◽  
Vol 271 ◽  
pp. 9-17 ◽  
Author(s):  
Lkhagvajav Sarantuya ◽  
Galsan Sevjidsuren ◽  
Pagvajav Altantsog ◽  
Namsrai Tsogbadrakh
Keyword(s):  
Lithium Ion Batteries ◽  
Anode Material ◽  
Photoelectron Spectroscopy ◽  
Density Functional ◽  
Spinel Phase ◽  
Rate Capability ◽  
Lithium Ion ◽  
X Ray Diffraction ◽  
X Ray ◽  
Average Grain Size

Nanosized spinel Li4Ti5O12 was successfully synthesized by a solid state reaction method at 800°C according to the Li4Ti5O12cubic spinel phase structure. In this synthesizing process, anatase TiO2and Li2CO3were used as reactants. The average grain size of the synthesized powders was around 200 nm. The synthesized Li4Ti5O12powder was characterized X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray spectrometry (EDS), and Specific Surface Area Analyzer (BET, Brunner-Emmett-Teller) respectively. X-ray diffraction results show that calcination temperature and time have the important effects on the crystal structure of Li4Ti5O12powder. In this study, we used a first principle method, based on the density functional theory to explore electronic and structural properties of Li4Ti5O12, as anode material for lithium ion batteries. Differences on these properties between delithiation state Li4Ti5O12and lithiation state Li7Ti5O12are compared. All the predicted structural and electrochemical properties agree closely with the experimental findings in literature. The average intercalation voltage of 1.4V during charging/discharging were obtained. We have shown that the Li4Ti5O12material exhibits insulating behavior with the band gap of 3.16 and 3.90 eV using the GGA and GGA+U+J0calculations respectively. Li7Ti5O12becomes metallic as Li atoms inserted in Li4Ti5O12material. Spinel Li4Ti5O12has been regarded as an attractive anode material for the development of high-power lithium-ion batteries because of its unique attributes of high safety and rate capability.

Electrochemical Properties of Li0.99Gd0.01FePO4/C Composite Cathode for Lithium-Ion Batteries

2010 ◽  
Vol 146-147 ◽  
pp. 1233-1237
Author(s):  
Bin Sun ◽  
Yi Feng Chen ◽  
Kai Xiong Xiang ◽  
Wen Qiang Gong ◽  
Han Chen
Keyword(s):  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Composite Cathode ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electrochemical Tests ◽  
Capacity Loss ◽  
Lattice Doping ◽  
Scanning Electron

Li0.99Gd0.01FePO4/C composite was prepared by solid-state reaction, using particle modification with amorphous carbon from the decomposition of glucose and lattice doping with supervalent cation Gd3+. All samples were characterized by X-ray diffraction, scanning electron microscopy, multi-point Brunauer Emmett and Teller methods. The electrochemical tests show Li0.99Gd 0.01FePO4/C composite obtains the highest discharge specific capacity of 154 mAh.g-1 at C/10 rate and the best rate capability. Its specific capacity reaches 131 mAh.g-1 at 2 C rate. Its capacity loss is only 14.9 % when the rate varies from C/10 to 2 C.

Synthesis of MoO3/V2O5/C Composite as Novel Anode for Li-Ion Battery Application

2020 ◽  
Vol 20 (5) ◽  
pp. 2911-2916
Author(s):  
Zhen Zhang ◽  
Xiao Chen ◽  
Guangxue Zhang ◽  
Chuanqi Feng
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Li Ion Battery ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Li Ion ◽  
Battery Application

The MoO3/V2O5/C, MoO3/C and V2O5/C are synthesized by electrospinning combined with heat treatment. These samples are characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy and thermogravimetric analysis (TG) techniques. The results show that sample MoO3/V2O5/C is a composite composed from MoO3, V2O5 and carbon. It takes on morphology of the nanofibers with the diameter of 200~500 nm. The TG analysis result showed that the carbon content in the composite is about 40.63%. Electrochemical properties for these samples are studied. When current density is 0.2 A g−1, the MoO3/V2O5/C could retain the specific capacity of 737.6 mAh g−1 after 200 cycles and its coulomb efficiency is 92.99%, which proves that MoO3/V2O5/C has better electrochemical performance than that of MoO3/C and V2O5/C. The EIS and linear Warburg coefficient analysis results show that the MoO3/V2O5/C has larger Li+ diffusion coefficient and superior conductivity than those of MoO3/C or V2O5/C. So MoO3/V2O5/C is a promising anode material for lithium ion battery application.

Electrochemical Performance of Mg-Doped Li2FeSiO4/C as Cathode Material for Lithium-Ion Batteries

2013 ◽  
Vol 310 ◽  
pp. 90-94 ◽  
Author(s):  
Xiao Bing Huang ◽  
Hong Hui Chen ◽  
Huang Rong Li ◽  
Qian Peng Yang ◽  
Shi Biao Zhou ◽  
...  
Keyword(s):  
Electrochemical Impedance ◽  
Rate Capability ◽  
Lithium Ion ◽  
Impedance Spectra ◽  
X Ray Diffraction ◽  
Electrochemical Impedance Spectra ◽  
Solid State Method ◽  
X Ray ◽  
Mg Doped ◽  
Discharge Test

Li2FeSiO4/C and Li1.97Mg0.03FeSiO4/C composites were successfully prepared by a solid-state method. Both samples were systematically investigated by X-ray diffraction(XRD), scanning electron microscopy(SEM), the charge-discharge test and electrochemical impedance spectra measurement, respectively. It was found that the Li1.97Mg0.03FeSiO4/C composite exhibited an excellent rate capability with a discharge capacity of 144mAh g-1 at 0.2C and 97mAh g-1 at 5C, and after 100 cycles at 1 C, 96% of its initial capacity was retained.

scholarly journals Coprecipitation and Characterization of Na Substituted LiMn0.5Ni0.5O2 for Lithium ion Battery Cathodes

2020 ◽  
Vol 36 (3) ◽  
Author(s):  
Le Phan Cam Linh ◽  
Nguyen Van Ky ◽  
Pham Duy Long ◽  
Giang Hong Thai ◽  
Dang Thi Thanh Le ◽  
...  
Keyword(s):  
Lattice Constant ◽  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Solid State Reaction Method ◽  
Rhombohedral Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Na Substitution ◽  
Co Precipitation

In this study, Li1-xNaxMn0.5Ni0.5O2 materials were successfully synthesized by co-precipitation following by solid state reaction method. X-ray powder diffraction analyses showed that the Li1-xNaxMn0.5Ni0.5O2 materials were single-phase and crystallized in a rhombohedral structure with a space group of R–3m at Na substitution concentrations of 0–20%. When increasing the concentration of Na substitution to 30%, diffraction peaks of Na2Mn3O7 as an impurity phase appeared in the X-ray diffraction pattern of the synthesized material. Rietveld refinements of the X-ray diffraction patterns revealed that the substitutions of Na for Li resulted in significant increments of the lattice constant c and slight increments of the lattice constant a. The results of galvanostatic charge/discharge measurements showed that the substitutions reduced the specific capacity but improved the rate capability of the Li0.8Na0.2Mn0.5Ni0.5O2 in comparison with the LiMn0.5Ni0.5O2 material.

Introduction of Li+ Ions into Anodic Film by Hydrotalcite Precursor and Electrochemical Behavior

2006 ◽  
Vol 11-12 ◽  
pp. 509-512 ◽  
Author(s):  
Hao Ye ◽  
Yu Zuo ◽  
Jin Ping Xiong ◽  
Jing Mao Zhao
Keyword(s):  
Photoelectron Spectroscopy ◽  
Electrochemical Impedance ◽  
Lithium Ion ◽  
Anodic Film ◽  
Nacl Solution ◽  
X Ray Diffraction ◽  
Precursor Method ◽  
X Ray ◽  
Al Composite ◽  
High Purity Aluminum

Lithium ion was introduced into high purity aluminum (99.999%) by hydrotalcite precursor method, and Li/Al composite anodic film was obtained by anodizing. The methods of X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to investigate the properties of the anodic film. The electrochemistry behaviors of composite anodic film were studied by means of potentiodynamic method and electrochemical impedance spectroscopy (EIS). The results showed that the composite anodic film was produced by hydrotalcite precursor method and which is amorphous to X-ray diffraction. The passivation current density of the anodic film in NaCl solution (1mol/L, pH=3, 7, 11) decreased obviously, while impedance value increased sharply. Corrosion resistance of the composite anodic film in NaCl solution was improved by the introduction of Li+ ion.

Synthesis and Electrochemical Properties of LiNi0.5Mn0.5O2 Cathode Materials by a Carbonate Co-Precipitation Method

2011 ◽  
Vol 347-353 ◽  
pp. 3497-3500 ◽  
Author(s):  
Zhi Yong Yu ◽  
Yun Jiang Cui ◽  
Han Xing Liu
Keyword(s):  
Discharge Rate ◽  
Lithium Ion ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Capacity Fading ◽  
Voltage Range ◽  
X Ray ◽  
Initial Charge ◽  
Discharge Behavior ◽  
Co Precipitation

The layered LiNi0.5Mn0.5O2 used as a cathode material for lithium-ion batteries was synthesized from precursor Ni0.5Mn0.5CO3 prepared via a carbonate co-precipitation method. The precursor Ni0.5Mn0.5CO3 was synthesized by the addition of KHCO3 to an aqueous solution of Ni, Mn sulphates. The powder LiNi0.5Mn0.5O2 was characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). Spherical LiNi0.5Mn0.5O2 with well development layered structure was obtained by the carbonate co-precipitation method. The LiNi0.5Mn0.5O2 samples adopted the α-NaFeO2 structure with a space group R-3m. Galvanostatic charge-discharge behavior of the LiNi0.5Mn0.5O2 cathodes delivered a initial charge and discharge capacity of 144.4 mAh/g and 140.2 mAh/g, respectively in the voltage range 2.5-4.5V at a discharge rate of 0.02A/g. The capacity showed no dramatic capacity fading during 50 cycles.

scholarly journals High Rate Performance of Ca-Doped Li4Ti5O12 Anode Nanomaterial for the Lithium-Ion Batteries

2018 ◽  
Vol 2018 ◽  
pp. 1-6
Author(s):  
Heming Deng ◽  
Wei Liang ◽  
Dexin Nie ◽  
Jian Wang ◽  
Xu Gao ◽  
...  
Keyword(s):  
Specific Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
High Rate ◽  
X Ray Diffraction ◽  
Reaction Route ◽  
X Ray ◽  
Structure Changes ◽  
High Rate Performance ◽  
Li4ti5o12 Anode

The spinel Li4Ti5O12 (LTO) has been doped by Ca2+ via a solid-state reaction route, generating highly crystalline Li3.9Ca0.1Ti5O12 powders in order to improve the electrochemical performance as an anode. The structure changes, morphologies, and electrochemical properties of the resultant powders have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and cyclic voltammetry (CV), respectively. Crystal structure and composition were analyzed, and results were obtained with various tests of LTO. Electrochemical measurements revealed that Li3.9Ca0.1Ti5O12 anodes exhibit better rate capability, better cycling stability, and a higher specific capacity than pure LTO anodes.

Electroanalytical characterization of F-doped MoS2 cathode material for rechargeable magnesium battery

2019 ◽  
Vol 12 (03) ◽  
pp. 1950041 ◽  
Author(s):  
Gundu Venkateswarlu ◽  
Devarapaga Madhu ◽  
Jetti Vatsala Rani
Keyword(s):  
Cathode Material ◽  
Photoelectron Spectroscopy ◽  
Electrochemical Impedance ◽  
Synergetic Effect ◽  
Solution Process ◽  
Rate Capability ◽  
X Ray Diffraction ◽  
X Ray ◽  
Effective Performance

Fluorine (F)-doped MoS2 was prepared by F-doping into layered MoS2 via chemical solution process with fluoroboric acid. X-ray photoelectron spectroscopy, field emission scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction were applied to conform the effect of F on the structure. The electrochemical performance was investigated by using cyclic voltammetry, electrochemical impedance spectroscopy, and galvanostatic charge/discharge studies. The F-doped MoS2 as cathode material for rechargeable Mg battery exhibited a good discharge capacity of 55[Formula: see text]mAhg[Formula: see text], with a good rate capability and good cycling stability when compared to pristine B-MoS2. The effective performance of F-doped MoS2 are attributed to the unique structure and synergetic effect between layered MoS2.

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