Effect of Solid Reaction Temperature on the Cation Mixing and Electrochemical Properties of LiNi0.4Co0.2Mn0.4O2 Catode Materials in High Energy Li-Ion Batteries

A LiNi0.4Co0.2Mn0.4O2 material was prepared via the co-precipitation in solution and ensuing solid reaction of the prepared precursors with LiOH.H2O, investigating the influence of solid reaction temperature on the cation mixing and electrochemical performance of the materials as a cathode. The results show that Li+/Ni2+ cation mixing decreases with the increase of calcination temperature in the range of 700-900°C, and the lower degree of cation mixing can improve 2D layered structure and make the material more stable. The discharge capacity and the capacity retention rate of the material is strongly impacted by the reaction temperature.The powders calcined at 900°C show the best electrochemical performance and the initial discharge capacity is 163.1mA·h/g, after 40 cycles, the capacity retention rate is 93.9%.

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Effect of Calcination Temperature on the Structure and Electrochemical Performance of LiNi0.4Co0.2Mn0.4O2

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.912-914.18 ◽

2014 ◽

Vol 912-914 ◽

pp. 18-22

Author(s):

Lin Zhang ◽

Fei Luo ◽

Jian Hua Wang ◽

Yu Zhong Guo

Keyword(s):

Electrochemical Performance ◽

Calcination Temperature ◽

Discharge Capacity ◽

Retention Rate ◽

Lithium Ion ◽

Precipitation Method ◽

X Ray Diffraction ◽

Capacity Retention ◽

Cation Mixing ◽

Co Precipitation

LiNi0.4Co0.2Mn0.4O2, as the cathode materials for lithium ion battery, were prepared from the precursors, Ni0.4Co0.2Mn0.4 (OH)2 which were synthesized by chemical co-precipitation method. The crystal structure and morphology of the prepared powders have been characterized by X-ray diffraction and SEM, respectively. The results show that Li+/Ni2+ cation mixing decreases with increase of calcination temperature in the range of 700-900°C.The lower degree of cation mixing can improve the transfer of Li ions and lead to layered structure more stable. The discharge capacity and the capacity retention rate of the material is strongly impacted by the reaction temperature.The powders sintered at 900°C show the best electrochemical performance and the initial discharge capacity is 148.3mA·h/g, after 40 cycles, the capacity retention rate is 93.9%.

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Synthesis of LiNi1/3Co1/3Mn1/3O2 Composite Powders by Solid State Reaction

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.158.262 ◽

2010 ◽

Vol 158 ◽

pp. 262-272 ◽

Cited By ~ 4

Author(s):

Li Zhang ◽

Pei Xin Zhang ◽

Zhen Zhen Fan ◽

Xiang Zhong Ren ◽

Dong Yun Zhang ◽

...

Keyword(s):

Solid State ◽

Discharge Capacity ◽

Retention Rate ◽

High Energy ◽

Molar Ratio ◽

Wet Milling ◽

Composite Powders ◽

Capacity Retention ◽

Charge Discharge ◽

Discharge Test

A mixture of Li2CO3, NiO, Co2O3 and MnO2 with a molar ratio was introduced in the mixed high energy ball milling, LiNi1/3Co1/3Mn1/3O2 was prepared by solid state phase using mechanochemical activation which has highly reactive materials. The structure and electrochemical properties of LiNi1/3Co1/3Mn1/3O2 were analisised by employing X-ray diffraction(XRD), scanning electron microscopy(SEM) and galvanotactic charge-discharge test. Charge-discharge test results show that when the the LiNi1/3Co1/3Mn1/3O2 cathode was prepared by wet milling 10h between 2.8 V and 4.4V at a current of 0.5C rate, the initial discharge capacity is 135.1mAh/g, the capacity retention rate of 93.26% after 20 cycles. When nLi: n (Ni + Co + Mn) = 1.1, the samples sintered 20h at 850 °C, the first discharge capacity is 148.5 mAh/g, and the capacity retention rate is 94.88% after 40 cycles.

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Influence of Aging Process on the Crystalline Structure and Electrochemical Properties of LiNi0.8Co0.1Mn0.1O2 Cathode Material

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.912-914.182 ◽

2014 ◽

Vol 912-914 ◽

pp. 182-187 ◽

Cited By ~ 1

Author(s):

Liang Bin Liu ◽

Lu Zheng ◽

Jian Hua Wang ◽

Yu Zhong Guo

Keyword(s):

Aging Process ◽

Layer Structure ◽

Retention Rate ◽

Xrd Analysis ◽

Precipitation Method ◽

Content Increase ◽

Capacity Retention ◽

Cation Mixing ◽

Two Phases ◽

Co Precipitation

Ni0.8Co0.1Mn0.1(OH)2 precursors prepared by co-precipitation method were served to synthesize LiNi0.8Co0.1Mn0.102 cathode materials by sintering with LiOH·H2O at high temperature. It is shown from XRD analysis and electrochemical measurements that these precursors synthesized at different aging time are all composed of two phases, α-Ni (OH)2 and β-Ni (OH)2.With aging process lasting longer,relatively content of α-Ni (OH)2 in precursors increase , peak intensity ratios of I(003)/I(104) in LiNi0.8Co0.1Mn0.102 get larger, the more complete of layer structure, the lower of Li+/Ni2+cation mixing. Results indicate that the existence and content increase of α-Ni (OH)2 phase with aging process lasting can inhibit the cation mixing efficaciously. LiNi0.8Co0.1Mn0.102 obtained from precursor aged 12h has a good cyclic performance, capacity retention rate reaches 92.8% after 30 cycles.

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Electrochemical Performance of Al2O3-Coated LiNi1/3Co1/3Mn1/3O2 Cathode Materials for Li-Ion Batteries

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.336-338.459 ◽

2007 ◽

Vol 336-338 ◽

pp. 459-462

Author(s):

Jian Gang Li ◽

Xiang Ming He ◽

Ru Song Zhao ◽

Chun Rong Wan ◽

Shi Chao Zhang

Keyword(s):

Electrochemical Performance ◽

Discharge Capacity ◽

Electrical Performance ◽

Coated Sample ◽

Li Ion Batteries ◽

Al2o3 Coating ◽

Capacity Retention ◽

Initial Discharge ◽

Excellent Electrochemical Performance ◽

Li Ion

Al2O3-coated LiNi1/3Co1/3Mn1/3O2 powders with excellent electrochemical performance have been synthesized. The electrochemical performance of Al2O3-coated LiNi1/3Co1/3Mn1/3O2 electrodes has been studied as function of the level of Al2O3 coating. Coated LiNi1/3Co1/3Mn1/3O2 samples shows higher discharge capacity and better capacity retention than the base one. Among the coated samples, 1.0mol% coated sample exhibits the best electrical performance. It presents an initial discharge capacity of 174.5 mAh g-1 over 2.5~4.4V, and 84.7% capacity retention after 30 cycles over 2.5~4.6V.

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Preparation of xLi2MnO3·(1-x)(LiMn1/3Co1/3Ni1/3)O2 cathode material and its electrochemical properties for Li-ion batteries

Materials Express ◽

10.1166/mex.2021.1999 ◽

2021 ◽

Vol 11 (6) ◽

pp. 959-965

Author(s):

Yu Zou ◽

Yueyun Zhou

Keyword(s):

Chemical Composition ◽

Electrochemical Performance ◽

Cathode Materials ◽

Li Ion Batteries ◽

Capacity Retention ◽

Charge Capacity ◽

Li Ion ◽

Co Precipitation ◽

Discharge Efficiency ◽

Crystallization Degree

The layered xLi2MnO3·(1-x)(LiMn1/3Co1/3Ni1/3)O2 (x = 0.15, 0.3, 0.45) as cathode materials in Li-ion batteries were prepared by co-precipitation of hydroxides. The effects of sintering duration, chemical composition and temperature on the structure and electrochemical performance were studied. The results show that the 0.3Li2MnO3·0.7(LiMn1/3Co1/3Ni1/3)O2 material prepared at 800 °C for 20 h has higher crystallization degree and better electrochemical performance. The charge capacity in the first circle was 359.8 mAh·g-1, the discharge capacity was 240.3 mAh·g-1, the discharge efficiency was 66.8% and the capacity retention was also 97.6% after 20 cycles.

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Electrochemical Performance Ni Doped Spinel LiMn2O4 Cathode for Lithium Ion Batteries

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.347-353.290 ◽

2011 ◽

Vol 347-353 ◽

pp. 290-300

Author(s):

Yong Li Cui ◽

Wen Jing Bao ◽

Zheng Yuan ◽

Quan Chao Zhuang ◽

Zhi Sun

Keyword(s):

Electrochemical Performance ◽

Discharge Capacity ◽

Retention Rate ◽

Sol Gel ◽

Lithium Ion ◽

Cyclic Voltammogram ◽

X Ray Diffraction ◽

Capacity Retention ◽

Excellent Electrochemical Performance ◽

Charge Discharge

LiNixMn2-xO4 (x=0, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5) compounds with spinel crystal structure are synthesized by sol-gel method. The dependence of the physicochemical properties of these compounds has been extensively investigated by using X-ray diffraction (XRD), scanning electron microscope (SEM), cyclic voltammogram (CV) and charge-discharge test. It is found that as Mn is replaced by Ni, the initial capacity decreases, but the capacity retention is enhanced. Of all the LiNixMn2-xO4 (x=0, 0.05, 0.1, 0.2, 0.3, 0.4) compounds, the LiNi0.2Mn1.8O4 has best electrochemical performance, about 120mAhg-1 discharge capacity, its capacity retention rate of 96.6% after 100 cycles. However the LiNi0.5Mn1.5O4 sample shows excellent electrochemical performance at 4.7 V high potential, 150 mAhg-1 discharge capacity, above 110 mAhg-1 of capacity retention after 42 cycles of charge/discharge. The prepared LiNi0.5Mn1.5O4 powders sintered at 750 °C here has Fd3m space group.

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Effect of Nitric Acid Modification on LiMn2O4 Prepared by Solution Combustion Synthesis

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.80-81.332 ◽

2011 ◽

Vol 80-81 ◽

pp. 332-336 ◽

Cited By ~ 1

Author(s):

Yan Xia ◽

Mei Huang ◽

Jun Ming Guo ◽

Ying Jie Zhang

Keyword(s):

Nitric Acid ◽

Combustion Synthesis ◽

Discharge Capacity ◽

Retention Rate ◽

Solution Combustion Synthesis ◽

Manganese Acetate ◽

Solution Combustion ◽

Acid Modification ◽

Capacity Retention ◽

Liquid Combustion

Effect of nitric acid and the burning time on the liquid combustion synthesis of spinel LiMn2O4 has been studied, using lithium nitrite and Manganese acetate as raw a material. The results show that the main phases are all LiMn2O4, which can be obtained at 400-600 oC. Before modified, the impurity is Mn3O4 or Mn2O3. After modified, the impurity is only Mn3O4. The aggregation obviously reduced after adding nitric acid, it is indicated that the crystalline increased. With the increasing temperatures, the modified particle size was increased and the aggregation reduced. The initial discharge capacity and cycle stability improved at some extent too. Its first discharge capacity was 104.6, 112.8 and 117.7mAh/g synthesized at 400, 500, 600 oC, respectively, and the 30th capacity retention rate were 84.89%, 80.67% and 73.24%.

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Probing the Effect of High Energy Ball Milling on the Structure and Properties of LiNi1/3Mn1/3Co1/3O2 Cathodes for Li-Ion Batteries

Journal of Electrochemical Energy Conversion and Storage ◽

10.1115/1.4034755 ◽

2016 ◽

Vol 13 (3) ◽

Cited By ~ 5

Author(s):

Malcolm Stein ◽

Chien-Fan Chen ◽

Matthew Mullings ◽

David Jaime ◽

Audrey Zaleski ◽

...

Keyword(s):

Particle Size ◽

Electrochemical Performance ◽

Crystallite Size ◽

Ball Milling ◽

Lithium Ion ◽

High Energy ◽

Li Ion Batteries ◽

Structure And Properties ◽

Transfer Resistance ◽

Li Ion

Particle size plays an important role in the electrochemical performance of cathodes for lithium-ion (Li-ion) batteries. High energy planetary ball milling of LiNi1/3Mn1/3Co1/3O2 (NMC) cathode materials was investigated as a route to reduce the particle size and improve the electrochemical performance. The effect of ball milling times, milling speeds, and composition on the structure and properties of NMC cathodes was determined. X-ray diffraction analysis showed that ball milling decreased primary particle (crystallite) size by up to 29%, and the crystallite size was correlated with the milling time and milling speed. Using relatively mild milling conditions that provided an intermediate crystallite size, cathodes with higher capacities, improved rate capabilities, and improved capacity retention were obtained within 14 μm-thick electrode configurations. High milling speeds and long milling times not only resulted in smaller crystallite sizes but also lowered electrochemical performance. Beyond reduction in crystallite size, ball milling was found to increase the interfacial charge transfer resistance, lower the electrical conductivity, and produce aggregates that influenced performance. Computations support that electrolyte diffusivity within the cathode and film thickness play a significant role in the electrode performance. This study shows that cathodes with improved performance are obtained through use of mild ball milling conditions and appropriately designed electrodes that optimize the multiple transport phenomena involved in electrochemical charge storage materials.

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Effect of Content of Mg on the Electrochemical Performance of La1-xMgxNi2.8Co0.7 (x=0.1, 0.3, 0.5) Hydrogen Storage Alloy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.113-116.2129 ◽

2010 ◽

Vol 113-116 ◽

pp. 2129-2133

Author(s):

Jing Wang ◽

Dao Bin Mu ◽

Feng Wu ◽

Shi Chen

Keyword(s):

Hydrogen Storage ◽

Electrochemical Performance ◽

Discharge Capacity ◽

Hydrogen Storage Alloy ◽

Diffusion Method ◽

Capacity Retention ◽

Solid Diffusion ◽

Maximum Discharge

La1-xMgxNi2.8Co0.7 (x=0.1, 0.3, 0.5) hydrogen storage alloy was synthesized by solid diffusion method. The microstructure of the alloy was analyzed by XRD when the content of Mg was changed. When x equaled to 0.3, there was relative much La2Ni7 phase in the alloy and the alloy exhibited better integrated electrochemical performance. Its maximum discharge capacity reached 355.4mAh/g and capacity retention after 50 cycles（S50）was 77.80%. The results showed the existence of La2Ni7 phase would be conductive to the integrated electrochemical performance of the alloy.

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