Research on Electrochemical Properties of LiMnPO4 Synthesized by High Temperature Solid-Phase Method

2012 ◽  
Vol 487 ◽  
pp. 714-718 ◽  
Author(s):  
Sheng Kui Zhong ◽  
Ying Mei Zhang ◽  
Wei Li ◽  
Yue Bin Xu
Keyword(s):  
High Temperature ◽  
Solid Phase ◽  
Raw Materials ◽  
Particle Surface ◽  
Lithium Ion ◽  
Xrd Analysis ◽  
Spherical Particles ◽  
Phase Method ◽  
Solid Phase Method ◽  
Olivine Structure

LiMnPO4cathode material for lithium ion batteries was synthesized by high temperature solid-phase method using MnCO3, Li2CO3, NH4H2PO4as raw materials. The structure of samples was identified by XRD analysis and the particle surface morphology was examined by SEM. The results of XRD showed that the LiMnPO4sample sintered at 700°C for 20h had single ordered olivine structure. The SEM pattern showed that spherical particles distributed uniformly. Respectively, it figured out that the initial charge and discharge capacities of the samples at 0.05C rate were 133.9 and 66.4mAh•g-1.

Electrochemical Properties of LiMnPO4 Cathode Material Prepared by Ball-Milling

2012 ◽  
Vol 487 ◽  
pp. 735-738
Author(s):  
Sheng Kui Zhong ◽  
Yue Bin Xu ◽  
Wei Li ◽  
Wei Chen
Keyword(s):  
Cathode Material ◽  
Ball Milling ◽  
Solid Phase ◽  
Lithium Ion ◽  
Spherical Particles ◽  
Phase Method ◽  
Sem Images ◽  
Initial Charge ◽  
Solid Phase Method ◽  
Olivine Structure

The ball-milling LiMnPO4 powders for lithium-ion batteries were synthesized by high temperature solid-phase method. The effects of ball-milling on the microstructure and electrochemical performance of LiMnPO4 cathode material were investigated. The XRD patterns showed that the LiMnPO4 sample with ball milling 20h had single ordered olivine structure. The SEM images revealed that spherical particles distributed uniformly. The LiMnPO4 powders, of which the initial charge and discharge capacities at 0.05C rate were 133.9 and 66.4mAh•g-1 at 0.05C rate were prepared at 700°C for 20h with ball milling 20h.

Synthesis and Electrochemical Performance of LiFe1-xMnxPO4/C Cathode Material

2011 ◽  
Vol 347-353 ◽  
pp. 3434-3438
Author(s):  
Yan Jun Wei ◽  
Guang Chuan Liang ◽  
Li Wang ◽  
Xiu Qin Ou
Keyword(s):  
High Temperature ◽  
Electrochemical Performance ◽  
Cathode Material ◽  
Electrochemical Properties ◽  
Specific Energy ◽  
Solid Phase ◽  
Constant Current ◽  
Phase Method ◽  
Solid Phase Method ◽  
Constant Current Charging

Olivine LiFe1−xMnxPO4/C composites were prepared by high temperature solid phase method using MnO2, NH4H2PO4, Li2CO3, FeC2O4•2H2O, glucose as the starting materials. XRD, SEM and constant-current charging/discharging tests were used to study the structure and electrochemical properties of the material. The result showed that when x=0.2 the material exhibited the optimal electrochemical performance, with a higher specific energy of 484.94 Wh/kg.

scholarly journals Effect of Waste Glass Powder on Phase, Microstructure and Mechanical Properties of Mullite Based Porous Ceramics with Coal-series Solid Waste as Raw Materials

2020 ◽  
Author(s):  
Wei Lian ◽  
Yan Liu ◽  
Wenjie Wang ◽  
Yangtao Dong ◽  
Sheng Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Glass Powder ◽  
Solid Phase ◽  
Raw Materials ◽  
Porous Ceramics ◽  
Volume Density ◽  
Synthesis Temperature ◽  
Phase Method ◽  
Microstructure And Mechanical Properties ◽  
Solid Phase Method

Abstract Mullite based porous ceramics were successfully prepared by using a solid-phase method with gangue, slime and sawdust as raw materials. The effects of the content of glass powder and calcining temperature on microstructure and mechanical properties of the samples were systematically studied. It is found that glass powder can prevent the formation of Kyanite and reduce the synthesis temperature of mullite. The samples with 4% glass powder have a large amount of mullite calcined at 1150°C for 3h. Meanwhile, alumina in the sample is completely converted into mullite at 1180°C for 3h. Mullite content reaches 64.2wt%. The minimum apparent porosity is 31.22%, while the maximum volume density and diameter shrinkage are 1.74g/cm 3 and 8.48%, respectively. The ratio of pores of <8μm to those of 8~20μm is varied from 7:2 to 2:7, due to the addition of the glass powder. With increasing content of mullite, the flexural properties of the samples are increased from 7.7MPa to 28.36MPa. Therefore, with solid wastes as the resource, the porous ceramics have a bright prospect.

Research on Grafted Chitosan in Heterogeneous System

2011 ◽  
Vol 239-242 ◽  
pp. 3275-3278
Author(s):  
Juan Qin Xue ◽  
Dan Dan Wen ◽  
Wei Bo Mao ◽  
Yun Feng Xue ◽  
Ye Wei Du
Keyword(s):  
Reaction Time ◽  
Solid Phase ◽  
Raw Materials ◽  
Sodium Thiosulfate ◽  
Ammonium Molybdate ◽  
Phase Method ◽  
Cobalt Metal ◽  
Experimental Conditions ◽  
Metallic Salt ◽  
Solid Phase Method

With phthalic anhydride, urea, metallic salt and ammonium molybdate as raw materials, Cobalt metal phthalocyanines is prepared by solid-phase method, and the cobalt metal phthalocyanine is modified by the shun dl-aspartic acid anhydride. In the homogeneous conditions, the effects of the reaction temperature, the reaction time, phthalocyanine dosage and initiator dosage are studied. The experimental results show that the grafting polymerization products with the highest grafted rate can be prepared under the optimal experimental conditions, which are found to be 60°C for the temperature, 3h for the reaction time, 0.08g for the potassium persulfate and sodium thiosulfate. The product is analyzed by means of IR, the results show that the chitosan is grafted successfully, and the reaction may occurs on the amino and the hydroxyl of chitosan.

scholarly journals Improved Electrochemical Properties of LiMn2O4-Based Cathode Material Co-Modified by Mg-Doping and Octahedral Morphology

Materials ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 2807 ◽  
Author(s):  
Hongyuan Zhao ◽  
Yongfang Nie ◽  
Dongyang Que ◽  
Youzuo Hu ◽  
Yongfeng Li
Keyword(s):  
High Temperature ◽  
Cathode Material ◽  
Electrochemical Properties ◽  
Solid Phase ◽  
High Capacity ◽  
Temperature Cycling ◽  
Phase Method ◽  
Mg Doping ◽  
Jahn Teller ◽  
Solid Phase Method

In this work, the spinel LiMn2O4 cathode material was prepared by high-temperature solid-phase method and further optimized by co-modification strategy based on the Mg-doping and octahedral morphology. The octahedral LiMn1.95Mg0.05O4 sample belongs to the spinel cubic structure with the space group of Fd3m, and no other impurities are presented in the XRD patterns. The octahedral LiMn1.95Mg0.05O4 particles show narrow size distribution with regular morphology. When used as cathode material, the obtained LiMn1.95Mg0.05O4 octahedra shows excellent electrochemical properties. This material can exhibit high capacity retention of 96.8% with 100th discharge capacity of 111.6 mAh g−1 at 1.0 C. Moreover, the rate performance and high-temperature cycling stability of LiMn2O4 are effectively improved by the co-modification strategy based on Mg-doping and octahedral morphology. These results are mostly given to the fact that the addition of magnesium ions can suppress the Jahn–Teller effect and the octahedral morphology contributes to the Mn dissolution, which can improve the structural stability of LiMn2O4.

The decay model of Eu2+ and Eu2+, Dy3+ substituted SrAl2O4 prepared by high temperature solid phase method

2019 ◽  
Vol 124 ◽  
pp. 151-156 ◽  
Author(s):  
Lei Yang ◽  
Qianwen Liu ◽  
Hongying Zheng ◽  
Siyuan Zhou ◽  
Wei Zhang
Keyword(s):  
High Temperature ◽  
Solid Phase ◽  
Phase Method ◽  
Decay Model ◽  
Solid Phase Method

Luminescence properties and energy transfer of La3Ga5SiO14:Eu3+, Tb3+ phosphors

CrystEngComm ◽  
2021 ◽  
Author(s):  
Xianggang Zuo ◽  
Yi Wang ◽  
Lei Wei ◽  
Xianshun Lv ◽  
Yangbin Fu ◽  
...  
Keyword(s):  
Energy Transfer ◽  
High Temperature ◽  
Solid Phase ◽  
Luminescence Properties ◽  
Phase Method ◽  
Excellent Performance ◽  
Solid Phase Method

In this paper, a series of Eu3+/Tb3+ doped La3Ga5SiO14 (LGS: Eu3+, Tb3+) phosphors with excellent performance have been synthesized by high-temperature solid-phase method. The effects of Eu3+ and Tb3+ doping...

Effects of Cr Doping on the Structural and Electrochemical Properties of V6O13

2010 ◽  
Vol 34-35 ◽  
pp. 1780-1783 ◽  
Author(s):  
Yuan Chun Liu ◽  
Zheng Guang Zou ◽  
Fei Long
Keyword(s):  
Electrochemical Properties ◽  
Cathode Materials ◽  
Solid Phase ◽  
Lithium Ion ◽  
Chain Structure ◽  
Raw Material ◽  
Phase Method ◽  
Discharge Process ◽  
Solid Phase Method ◽  
Cr Doping

It has been demonstrated that V6O13 is a very attractive cathode materials for rechargeable lithium-ion batteries. Cr3+ was doped to improve its electrochemical property. CrxV6O13(x =0.01~0.05) cathode materials were prepared using NH4VO3 and Cr2O3 as raw material by solid phase method in argon atmosphere. The best electrochemical properties of CrxV6O13 were obtained under the optimum conditions as follows: the argon flow rate is 85mL/min, the heating rate is 5°C /min, the holding time 1h at 180°C, 1h at 300°C and 30 min at 450°C. The structural and electrochemical properties were examined by means of X-ray diffraction, SEM and charge–discharge tests. The results demonstrated that the powders maintain double cavity chain structure regardless of the chromium doping. When the Cr doping of x = 0.03, capacity is highest. Maximum initial discharge capacity is 334mA•h/g, 80% of theoretical capacity. During discharge process there is 6.5 Li+ embedded in the Molecules of doping. After discharge cathode became Li6.5Cr0.03V6O13.

Structural analysis and optical temperature sensing performance of Eu3+-doped Ba3In(PO4)3

CrystEngComm ◽  
2020 ◽  
Vol 22 (35) ◽  
pp. 5809-5817
Author(s):  
Guangqing Zhang ◽  
Maxim S. Molokeev ◽  
Qianchao Ma ◽  
Xuening Yang ◽  
Shuiquan Han ◽  
...  
Keyword(s):  
High Temperature ◽  
Structural Analysis ◽  
Solid Phase ◽  
Temperature Sensing ◽  
Phase Method ◽  
Solid Phase Method ◽  
Sensing Performance

Eu3+-Doped Ba3In(PO4)3 was synthesized through a high-temperature solid-phase method.

Preparation of La1-xSrxMnO3 Materials by High Temperature Solid Phase Method

2012 ◽  
Vol 562-564 ◽  
pp. 482-485
Author(s):  
Zeng Gang Li ◽  
Zeng Yong Chu ◽  
Yong Jiang Zhou ◽  
Hai Feng Cheng
Keyword(s):  
Crystal Structure ◽  
Particle Size ◽  
High Temperature ◽  
Solid Phase ◽  
Average Particle Size ◽  
Phase Method ◽  
Average Particle ◽  
Structure And Morphology ◽  
Solid Phase Method ◽  
Perovskite Type

La1-xSrxMnO3 (LSMO) (x=0.1, 0.2, 0.3, 0.4)powders were synthesized by high temperature solid phase method, and the crystal structure and morphology were characterized by XRD and SEM. Results indicated that the pure perovskite type LSMO could be obtained after sintered at the temperature of 1000°C for 6h. The average particle size of the powders decreases with the increasing concentration of Strontium.

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