Electrochemical properties of high-voltage LiNi0.5Mn1.5O4 synthesized by a solid-state method

RSC Advances ◽  
2014 ◽  
Vol 4 (50) ◽  
pp. 26022-26029 ◽  
Author(s):  
Yan-Zhuo Lv ◽  
Yan-Zhang Jin ◽  
Yuan Xue ◽  
Jin Wu ◽  
Xiao-Gang Zhang ◽  
...  
Keyword(s):  
Solid State ◽  
Electrochemical Properties ◽  
High Voltage ◽  
Raw Materials ◽  
Cycling Stability ◽  
Solid State Method ◽  
State Method ◽  
Bulk Scale

The high-voltage LiNi0.5Mn1.5O4 synthesized at 850 °C for 12 h and sintered at 600 °C for 6 h exhibits excellently cycling stability from industrial raw materials in bulk scale (>0.5 kg).

ChemInform Abstract: Electrochemical Properties of High-Voltage LiNi0.5Mn1.5O4Synthesized by a Solid-State Method.

ChemInform ◽  
2014 ◽  
Vol 45 (47) ◽  
pp. no-no
Author(s):  
Yan-Zhuo Lv ◽  
Yan-Zhang Jin ◽  
Yuan Xue ◽  
Jin Wu ◽  
Xiao-Gang Zhang ◽  
...  
Keyword(s):  
Solid State ◽  
Electrochemical Properties ◽  
High Voltage ◽  
Solid State Method ◽  
State Method

Facile Solid State Method Route Synthesis and Enhance Visible Light Activities of BiVO4 by Doping Co

2016 ◽  
Vol 703 ◽  
pp. 316-320
Author(s):  
Hai Feng Chen ◽  
Jing Ling Hu ◽  
Bing Xu
Keyword(s):  
Solid State ◽  
Visible Light ◽  
Catalytic Effect ◽  
Catalytic Properties ◽  
Raw Materials ◽  
X Ray Diffraction ◽  
Solid State Method ◽  
Illumination Time ◽  
X Ray ◽  
State Method

Using NH4VO3, Bi (NO3)3•5H2O and Co (NO3)2•6H2O as raw materials, Co doped BiVO4 (Co/BiVO4) photocatalysts were successfully prepared by solid state method. And the photo catalytic properties were test in this work. Crystal structures of these samples were characterized by X-ray diffraction (XRD). The Methyl Orange (MO) was simulated as the sewage under the visible light to explorer the influence of the illumination time and the mass of photocatalyst. The visible-light absorption spectrum of BiVO4 was broadening with doping Co. It was found that the Co/BiVO4 had higher photocatalytic activity than pure BiVO4 .The reason of enhanced catalytic effect also had been analyzed and discussed in the article.

scholarly journals Enhanced Cycling Stability of LiCuxMn1.95−xSi0.05O4 Cathode Material Obtained by Solid-State Method

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1302 ◽  
Author(s):  
Hongyuan Zhao ◽  
Fang Li ◽  
Xiuzhi Bai ◽  
Tingting Wu ◽  
Zhankui Wang ◽  
...  
Keyword(s):  
Solid State ◽  
Copper Ions ◽  
Cycling Performance ◽  
Cycling Stability ◽  
Doping Amount ◽  
Solid State Method ◽  
Electrochemical Tests ◽  
Improvement Effect ◽  
State Method ◽  
Co Doped

The LiCuxMn1.95−xSi0.05O4 (x = 0, 0.02, 0.05, 0.08) samples have been obtained by a simple solid-state method. XRD and SEM characterization results indicate that the Cu-Si co-doped spinels retain the inherent structure of LiMn2O4 and possess uniform particle size distribution. Electrochemical tests show that the optimal Cu-doping amount produces an obvious improvement effect on the cycling stability of LiMn1.95Si0.05O4. When cycled at 0.5 C, the optimal LiCu0.05Mn1.90Si0.05O4 sample exhibits an initial capacity of 127.3 mAh g−1 with excellent retention of 95.7% after 200 cycles. Moreover, when the cycling rate climbs to 10 C, the LiCu0.05Mn1.90Si0.05O4 sample exhibits 82.3 mAh g−1 with satisfactory cycling performance. In particular, when cycled at 55 °C, this co-doped sample can show an outstanding retention of 94.0% after 100 cycles, whiles the LiMn1.95Si0.05O4 only exhibits low retention of 79.1%. Such impressive performance shows that the addition of copper ions in the Si-doped spinel effectively remedy the shortcomings of the single Si-doping strategy and the Cu-Si co-doped spinel can show excellent cycling stability.

scholarly journals One pot synthesis of NiMo–Al2O3 catalysts by solvent-free solid-state method for hydrodesulfurization

RSC Advances ◽  
2017 ◽  
Vol 7 (86) ◽  
pp. 54468-54474 ◽  
Author(s):  
Xiaodong Yi ◽  
Dongyun Guo ◽  
Pengyun Li ◽  
Xinyi Lian ◽  
Yingrui Xu ◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Solid State ◽  
Raw Materials ◽  
Solvent Free ◽  
One Pot ◽  
Solid State Method ◽  
One Pot Synthesis ◽  
Hds Catalysts ◽  
State Method

A simple and solvent-free solid-state method was used to prepare NiMo–Al2O3 hydrodesulfurization (HDS) catalysts using Ni(NO3)2·6H2O, (NH4)6Mo7O24·4H2O, and AlCl3·6H2O as the solid raw materials and polyethylene glycol (PEG) as an additive.

Cu-doped P2-Na0.5Ni0.33Mn0.67O2 encapsulated with MgO as a novel high voltage cathode with enhanced Na-storage properties

2017 ◽  
Vol 5 (18) ◽  
pp. 8408-8415 ◽  
Author(s):  
Hari Vignesh Ramasamy ◽  
Karthikeyan Kaliyappan ◽  
Ranjith Thangavel ◽  
Vanchiappan Aravindan ◽  
Kisuk Kang ◽  
...  
Keyword(s):  
Solid State ◽  
High Voltage ◽  
Mixed Oxide ◽  
Sodium Ion ◽  
Sodium Ion Battery ◽  
Solid State Method ◽  
Conventional Solid State Method ◽  
State Method ◽  
Storage Properties

We report a novel P2-type Na0.5Ni0.26Cu0.07Mn0.67O2 (NCM) mixed oxide obtained by conventional solid-state method as a prospective cathode for sodium-ion battery (SIB) applications.

The Effect of Thermal Treatment Temperature and Duration on Electrochemistry Performance of LiNi1/3Co1/3Mn1/3O2 Cathode Materials for Lithium-ion Batteries

2018 ◽  
Vol 14 (5) ◽  
pp. 440-447 ◽  
Author(s):  
Gang Sun ◽  
Chenxiao Jia ◽  
Shuanlong Di ◽  
Jianning Zhang ◽  
Qinghua Du ◽  
...  
Keyword(s):  
Solid State ◽  
Thermal Treatment ◽  
Electrochemical Performance ◽  
Cathode Material ◽  
Lithium Ion Batteries ◽  
Cathode Materials ◽  
Raw Materials ◽  
Lithium Ion ◽  
Solid State Method ◽  
State Method

Background: LiNi1/3Mn1/3Co1/3O2 derived from the solid-state method suffers from the problem of significant irreversible charge-discharge behavior. To improve the electrochemical performance of LiNi1/3Mn1/3Co1/3O2, there are several important factors, such as starting raw materials, precursor, preparation method and conditions. In this work, the layered LiNi1/3Mn1/3 Co1/3O2 material was prepared by solid-state reaction. By varying the temperature and duration of synthesis thermal treatment, the greater crystallinity and well-ordered layered LiNi1/3Mn1/3Co1/3O2 cathode material has been successfully synthesized. The structural properties, morphology and electrochemical properties of LiNi1/3Mn1/3Co1/3O2 powders have been investigated in detail. Methods: LiNi1/3Co1/3Mn1/3O2 cathode material was synthesized via a high-temperature solid-state method. Stoichiometric amounts of Ni(CH3COO)2•4H2O, Co(CH3COO)2•4H2O, Mn(CH3COO)2• 4H2O, and Li2CO3 as raw materials were homogenized mixed in a ball mill for 8 h at 240 rpm. By varying the temperature and duration of synthesis thermal treatment, LiNi1/3Co1/3Mn1/3O2 cathode materials with different electrochemistry performance were achieved. (a) The effect of the temperature of synthesis thermal treatment on electrochemistry performance of LiNi1/3Co1/3Mn1/3O2 was explored by calcining the above mixed powder at 800°C, 850°C, 900°C, 950°C, and 1000°C for 12 h in air at a rate of 5°C min-1. Then the target product was prepared at last. The obtained compound was named as N-800, N-850, N-900, N-950 and N-1000, respectively. (b) In order to explore the effect of the duration of synthesis thermal treatment on electrochemistry performance of LiNi1/3 Co1/3Mn1/3O2 cathode material, the above mixed raw materials were calcined at 900°C for 4 h, 8 h, 12 h, 16 h and 20 h in air at a rate of 5°C min-1. The obtained compound was named as N-4, N-8, N- 12, N-16 and N-20, respectively. The N-900 and N-12 are the same sample. Results: The cathode material sintered at 900°C for 12 h revealed the best electrochemical performance, with high-capacity and recyclability compared with other materials. Its initial discharge capacity attains 182.4 mAh g-1 at 0.2 C in the voltage range of 2.5-4.6 V, which can be attributed to its greater crystallinity and well-ordered layered structure. Compared with other studies on lithium-ion batteries given in literature, this work provides a sample, optimal and mild synthetic conditions to synthesize the cathode materials with great electrochemistry performance. Conclusion: A greater crystallinity and well-ordered layered LiNi1/3Mn1/3Co1/3O2 powders had been successfully synthesized by mixing raw materials under various temperatures and duration of synthesis thermal treatment. The XRD results indicated the I(003)/I(104) values of N-900 (N-12) is 1.591 larger than 1.2, which illustrates no undesirable cation mixing to be occurred. In this work, from the results of electrochemical property experiments, it can be indicated that the optimal synthesized conditions are 900°C for 12 h. When the calcination temperature is too low and the calcined time is too short, the material is poorly crystalline and has a poor layer structure. When the calcination temperature is too high and the calcined time is too long, lithium salt is evaporated completely during the calcination process resulting in a poor electrochemistry performance.

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