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Lithium battery composite positive electrode material with core-shell structure and preparing method of lithium battery composite positive electrode material

A technology of composite positive electrode material and positive electrode material, applied in the field of lithium battery composite positive electrode material and its preparation, can solve the problems of reducing battery capacity, increasing battery internal resistance, etc., achieving a good transmission channel, reducing interface impedance, suitable for large-scale production effect

Inactive Publication Date: 2018-05-18
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the positive electrode side, the interface contact state between the solid electrolyte and the active material has a great influence on the performance of the battery. If the contact between the two is not good, such as point-to-point contact, it will lead to an increase in the internal resistance of the battery and reduce the battery performance. capacity

Method used

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  • Lithium battery composite positive electrode material with core-shell structure and preparing method of lithium battery composite positive electrode material
  • Lithium battery composite positive electrode material with core-shell structure and preparing method of lithium battery composite positive electrode material
  • Lithium battery composite positive electrode material with core-shell structure and preparing method of lithium battery composite positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0044] 500g of lithium cobaltate (LCO) and 5g of Li 1.4 Al 0.4 Ti 1.6 (PO 4 ) 3(LATP) was placed in a ball mill to fully mix the two, and the mixed material was placed in a fusion machine at a speed of 3000r / min. After fusion for 15mins, the LCO coated with LATP was taken out and placed in a tube furnace. In an air environment, the temperature was raised to 700 °C at a rate of 5 °C / min and kept for 4 h. Then put the obtained material and 1g of graphene back into the ball mill to fully mix the two, then take it out and put it in the fusion machine, and then fuse for 15mins, and finally you can get 1wt% LATP and 0.2wt% graphene coating Composite LCO cathode material with core-shell structure. SEM images of LCO powder before and after coating Figure 3A and 3B shown.

[0045] The coated LCO and the uncoated LCO materials were made into positive electrode sheets respectively, and a button-type liquid lithium-ion battery was made for performance comparison. The positive el...

example 2

[0047] 500g of lithium cobaltate (LCO) and 5g of Li 1.4 al 0.4 Ti 1.6 (PO 4 ) 3 (LATP) was placed in a ball mill to fully mix the two, and the mixed material was placed in a fusion machine at a speed of 3000r / min. After fusion for 15mins, the LCO coated with LATP was taken out and placed in a tube furnace. In an air environment, the temperature was raised to 700 °C at a rate of 5 °C / min and kept for 4 h. Then put the obtained material and 1g of graphene back into the ball mill to fully mix the two, then take it out and put it in the fusion machine, and then fuse for 15mins, and finally you can get 1wt% LATP and 0.2wt% graphene coating Composite LCO cathode material with core-shell structure.

[0048] The coated LCO is used as the positive electrode active material to make a mixed solid-liquid metal lithium battery, which includes a positive electrode, a negative electrode, a solid electrolyte sheet between the positive electrode and the negative electrode, and a small amo...

example 3

[0050] 500g of lithium cobaltate (LCO) and 5g of Li 1.4 al 0.4 Ti 1.6 (PO 4 ) 3 (LATP) was placed in a ball mill to fully mix the two, and the mixed material was placed in a fusion machine at a speed of 3000r / min. After fusion for 15mins, the LCO coated with LATP was taken out and placed in a tube furnace. In an air environment, the temperature was raised to 700 °C at a rate of 5 °C / min and kept for 4 h. Then put the obtained material and 1g of graphene back into the ball mill to fully mix the two, then take it out and put it in the fusion machine, and then fuse for 15mins, and finally you can get 1wt% LATP and 0.2wt% graphene coating Composite LCO cathode material with core-shell structure.

[0051] The coated LCO is used as a positive electrode active material to make an all-solid metal lithium battery, which includes a positive electrode, a negative electrode, and a solid electrolyte sheet between the positive electrode and the negative electrode. The mass ratio of ac...

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Abstract

The invention relates to a lithium battery composite positive electrode material with a core-shell structure and a preparing method of the lithium battery composite positive electrode material. The lithium battery composite positive electrode material comprises a core and a shell layer covering the core, the core is made of a lithium battery positive electrode material, and the shell layer is a composite conducting network layer formed by a solid electrolyte and a carbon material. The shell layer has both a good ionic conducting property and a good electron conducting property, thus regardingthe lithium battery composite positive electrode material, not only can the interface stability of the positive electrode material be improved to make the positive electrode material with high circulation stability, long service life, a good high-temperature property and high safety performance, but also the interface resistance of the positive electrode material is reduced, and the multiplying power performance of the positive electrode material is improved.

Description

technical field [0001] The present invention generally relates to the field of new energy, and more particularly relates to a lithium battery composite cathode material with a core-shell structure and a preparation method thereof. Background technique [0002] In recent years, with the vigorous development of portable consumer electronics, electric vehicles, large-scale energy storage and other fields, the demand for lithium batteries with high energy density, long cycle life and high safety has become more urgent. [0003] Traditional lithium battery cathode materials such as lithium cobaltate, lithium iron phosphate, and spinel lithium manganese oxide, etc., have been unable to meet the market's demand for energy density due to their low charging potential and low capacity. For positive electrode materials, increasing their operating voltage or increasing their specific capacity is an effective way to increase the energy density of batteries. For example, charging lithium...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/505H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/5825H01M4/624H01M4/625H01M10/0525H01M2004/028Y02E60/10
Inventor 王怡刘柏男禹习谦李泓
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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