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Cathode material of lithium ion battery and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of large solvent consumption, difficult to strictly control the ratio, poor repeatability of precursors, etc., and achieves a simple and easy preparation method. The effect of large-scale production and excellent electrochemical performance

Active Publication Date: 2011-08-10
INST OF CHEM CHINESE ACAD OF SCI
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  • 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 it cannot be charged to a high potential 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-ion battery cathode materials that have been reported so far is mostly based on the coprecipitation method. The repeatability of the precursor is poor, and the ratio of Co, Mn, and Ni in the product is difficult to strictly control

Method used

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  • Cathode material of lithium ion battery and preparation method thereof
  • Cathode material of lithium ion battery and preparation method thereof
  • Cathode material of lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1, the preparation of lithium nickel manganese cobalt oxide

[0027] LiNO 3 , Ni(NO 3 ) 2 , Mn(NO 3 ) 2 , Co(NO 3 ) 2 and C 6 h 8 o 7 (LiNO 3 , Ni(NO 3 ) 2 , Mn(NO 3 ) 2 , Co(NO 3 ) 2 and C 6 h 8 o 7The molar ratio is 1.07:0.33:0.33:0.33:1.2) was added into water, mixed evenly, and the pH of the system was adjusted to 7; the system was heated to 50°C for 12h to obtain a transparent sol; the sol was dried at 80°C for 90h, Obtain the precursor powder; pre-sinter the precursor powder at 300°C for 8h to obtain the intermediate product powder, press the intermediate product powder into tablets and sinter at 900°C for 12h to obtain LiNi x mn y co 1-x-y o 2 Nanoparticles, where x is 0.33 and y is 0.33.

[0028] Powder X-ray diffractometer (Rigaku DmaxrB, CuK α ray) to analyze the product, 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 ...

Embodiment 2

[0031] Embodiment 2, the preparation of lithium nickel manganese cobalt oxygen

[0032] LiNO 3 , Ni(NO 3 ) 2 , Mn(NO 3 ) 2 , Co(NO 3 ) 2 and C 6 h 8 o 7 (LiNO 3 , Ni(NO 3 ) 2 , Mn(NO 3 ) 2 , Co(NO 3 ) 2 and C 6 h 8 o 7 The molar ratio is 1.05:0.4:0.4:0.2:1) into water, mix well, adjust the pH of the system to 6; heat to 50°C for 12h to obtain a transparent sol; dry the sol at 80°C for 90h to obtain Precursor powder; pre-sinter the precursor powder at 400°C for 6h to obtain intermediate product powder; press the intermediate product powder into tablets and sinter at 900°C for 10h to obtain LiNi x mn y co 1-x-y o 2 The nanoparticles have a particle diameter of 20nm-700nm, wherein x is 0.4 and y is 0.4.

[0033] The specific discharge capacity of lithium nickel manganese cobalt oxygen prepared by this embodiment is 159mAh / g.

Embodiment 3

[0034] Embodiment 3, the preparation of lithium nickel manganese cobalt oxide

[0035] LiNO 3 , Ni(NO 3 ) 2 , Mn(NO 3 ) 2 , Co(NO 3 ) 2 and C 6 h 8 o 7 (LiNO 3 , Ni(NO 3 ) 2 , Mn(NO 3 ) 2 , Co(NO 3 ) 2 and C 6 h 8 o 7 The molar ratio is 1.03:0.5:0.3:0.2:0.8) into water, mix uniformly, adjust the pH of the system to 5; heat to 60°C and react for 10h to obtain a transparent sol; dry the sol at 80°C for 90h to obtain Precursor powder; pre-sintering the precursor powder at 500°C for 5 hours to obtain intermediate product powder; pressing the intermediate product powder into tablets and sintering at 900°C for 18 hours to obtain LiNi x mn y co 1-x-y o 2 The nanoparticles have a particle diameter of 10nm-500nm, wherein x is 0.5 and y is 0.3.

[0036] The specific discharge capacity of lithium nickel manganese cobalt oxygen prepared by this example is 161mAh / g.

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Abstract

The invention provides a cathode material of a lithium ion battery and a preparation method thereof. The cathode material comprises LiNixMnyCo(1-x-y)O2 nanoparticles, and the particle size of the nanoparticles is 10nm-2 mu m, wherein 0.1 <= x <= 0.9, 0.1<= y <= 0.9, and x + y <= 0.9. The preparation method of the cathode material comprises the following steps: enabling a lithium salt, a nickel salt, a cobalt salt, a manganese salt and a gelatinizing agent to perform reaction in water for getting sol; drying the sol to get precursor powder; and sequentially performing pre-sintering and sintering on the precursor powder and then getting the cathode material. The preparation method of the cathode material of the lithium ion battery, which comprises lithium, nickel, manganese, cobalt and oxygen is simple and easy to operate, raw materials are easy to get, and components in a product can be strictly controlled through feed ratio, thereby being suitable for large-scale production and being high in degree of practical degree. The cathode material of the lithium ion battery, which comprises the lithium, the nickel, the manganese, the cobalt and the oxygen is nano-material, can be directlyused as an electrode material of the battery and represents excellent electrochemical performance.

Description

technical field [0001] The invention relates to a lithium-ion battery cathode material 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, positive electrode materials for lithium-ion batteries (such as LiCoO 2 , LiMn 2 o 4 , LiFePO 4 ) and anode materials (such as C, Sn, Si) are increasingly in-depth research. Compared with negative electrode materials, the research on positive electrode materials is relatively lagging behind. Therefore, the development of positive electrode materials with excellent performance and low price has become the key to the development of lithium-ion batteries. LiMO 2 (M=Co, Ni, Mn, etc.) layered materials are favorable for Li due to their layered structure + Fast insertion / extraction, and high theoretical capacity (about 270mAh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505H01M4/1391
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 郭玉国江柯成万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
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