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Lithium-rich cathode material of lithium ion battery and preparation method thereof

A lithium-rich cathode material, lithium-ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of large solvent consumption, difficult to strictly control the proportion of transition metal salts, poor repeatability of precursors, etc., to achieve the preparation method Simple and easy to implement, suitable for large-scale production, and the effect of excellent electrochemical performance

Inactive Publication Date: 2011-11-23
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, three commonly used single-component layered oxide cathode materials have their own advantages and disadvantages: LiCoO 2 The electrochemical stability of LiNiO is good, and the cycle performance is excellent, but the actual capacity can only reach half of the theoretical capacity, and the price is high; LiNiO 2 The specific capacity is the highest, but the synthesis is difficult, and there are great safety hazards; LiMnO 2 Good thermal stability and cheap price, but the obvious phase transition during charge and discharge leads to poor cycle stability
[0003] The preparation process of lithium-rich materials reported so far is mostly based on coprecipitation method. This method needs to go through multiple steps such as coprecipitation and washing in the process of preparing precursors. The solvent consumption is relatively large, and the precursors produced Poor repeatability, the ratio of transition metal salts in the product is difficult to strictly control

Method used

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  • Lithium-rich cathode material of lithium ion battery and preparation method thereof
  • Lithium-rich cathode material of lithium ion battery and preparation method thereof
  • Lithium-rich cathode material of lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, preparation Li[Li 0.2 Ni 0.13 mn 0.54 co 0.13 ]O 2

[0029] Press LiNO 3 , Ni(NO 3 ) 2 , Mn(NO 3 ) 2 , Co(NO 3 ) 2 、C 6 h 8 o 7 The molar ratio is 1.25: 0.13: 0.54: 0.13: 1.2, take water as solvent, mix well, adjust the pH to 7; react at 50°C for 10 hours to obtain a transparent sol; dry the sol at 80°C for 120 Hours, the precursor powder was obtained; the precursor powder was pre-sintered at 300°C for 8h to obtain the intermediate product powder, and the intermediate product was pressed into tablets and then sintered at 900°C for 12h to obtain the product Li[Li 0.2 Ni 0.13 mn 0.54 co 0.13 ]O 2 .

[0030] Powder X-ray diffractometer (Rigaku DmaxrB, CuK α X-ray) analysis confirms the structure, the results are as follows figure 1 shown, from figure 1 It can be seen that there is no impurity peak in the spectrogram, indicating that the product is of high purity.

[0031] The morphology of the lithium-rich cathode material was character...

Embodiment 2

[0033] Embodiment 2, preparation Li[Li 0.25 Ni 0.04 mn 0.54 co 0.17 ]O 2

[0034] Press LiNO 3 : Ni(NO 3 ) 2 : Mn(NO 3 ) 2 : Co(NO 3 ) 2 : C 6 h 8 o 7 The molar ratio is 1.30:0.04:0.54:0.17:1, and the solution obtained by water and ethanol according to the volume ratio of 1:1 is used as a solvent, mixed uniformly, and the pH is adjusted to 6; reacted at 50°C for 10 hours to obtain Transparent sol; dry the sol at 80°C for 120 hours to obtain a precursor powder; pre-sinter the precursor powder at 400°C for 6 hours to obtain an intermediate product powder; press the intermediate product powder and sinter at 900°C 10h promptly obtains product Li [Li 0.25 Ni 0.04 mn 0.54 co 0.17 ]O 2 Nanoparticles, the particle size is 20nm-1000nm.

[0035] The specific discharge capacity of the lithium-rich cathode material prepared in this example is 215mAh / g.

Embodiment 3

[0036] Embodiment 3, preparation Li[Li 0.2 Ni 0.06 mn 0.47 co 0.27 ]O 2

[0037] Press LiNO 3 : Ni(NO 3 ) 2 : Mn(NO 3 ) 2 : Co(NO 3 ) 2 : C 6 h 8 o 7 The molar ratio is 1.23: 0.06: 0.47: 0.27: 0.8, and the solution obtained by mixing water and ethylene glycol according to the volume ratio of 3: 1 is used as a solvent, mix well, adjust the pH to 5; react at 60 ° C for 8 hours , to obtain a transparent sol; dry the sol at 80°C for 120 hours to obtain a precursor powder; pre-sinter the precursor powder at 500°C for 5 hours to obtain an intermediate product powder; Sintered for 18h to obtain the product Li[Li 0.2 Ni 0.06 mn 0.47 co 0.27 ]O 2 Nanoparticles, the particle size is 20nm-1200nm.

[0038] The discharge specific capacity of the lithium-rich cathode material prepared in this example is 239mAh / g.

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Abstract

The invention discloses a lithium-rich cathode material of a lithium ion battery and a preparation method thereof. The cathode material is a Li [LixNiyMnzCo1-x-y-z]O2+delta nanoparticle with a particle size of 10 nanometers-2 micrometers, wherein, x is greater than or equal to 0.05 and smaller than or equal to 0.5, y is greater than or equal to 0 and smaller than or equal to 0.95, x is smaller than or equal to 2z, z is greater than or equal to 0.025 and smaller than or equal to 0.95, and x+y+z is greater than or equal to 0.075 and smaller than or equal to 1, delta ranges from -0.2 to +0.2. The preparation method comprises the following steps of: subjecting a lithium salt, a transition metal salt and a gelatinizing agent to a reaction in a solvent so as to obtain a sol; drying the sol, thus obtaining precursor powder; carrying out pre-sintering and sintering in order to the precursor powder, thus obtaining the cathode material. The transition metal salt is a mixture of a manganese salt and at least one of a nickel salt and a cobalt salt. The lithium-rich cathode material provided in the invention is a nano-material, and can be used as a battery electrode material and presents an excellent electrochemical property.

Description

technical field [0001] The invention relates to a lithium-rich cathode material for a lithium-ion battery and a preparation method thereof, belonging to the technical field of lithium-ion batteries. Background technique [0002] With the widespread application of lithium-ion batteries in portable electronic products, electric vehicles and plug-in hybrid electric vehicles, lithium-ion battery electrode materials, including cathode materials (such as LiCoO 2 , LiMn 2 o 4 and LiFePO 4 etc.) and anode materials (such as C, Sn and Si, etc.), have received extensive attention and in-depth research. Compared with negative electrode materials, the research on positive electrode materials is relatively lagging behind. Therefore, the development of cathode materials with excellent performance and low price has become the key to improving the performance of lithium-ion batteries. Among all kinds of cathode materials, layered LiMO 2 (M=Co, Ni, Mn, etc.) materials can realize Li +...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/1391
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 郭玉国江柯成吴兴隆万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
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