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Preparation method for rare-earth-doped high-compaction ternary material

A ternary material, high-pressure compaction technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of resource shortage, decreased electrical performance cycle performance, low electrical conductivity, etc., and achieve easy realization of large-scale industrial The effect of production, discharge capacity improvement, and simple process

Active Publication Date: 2014-06-04
四川兴能新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently LiCoO 2 Cathode material is the earliest and most mature product developed. It has the characteristics of high compaction and good processing performance. Its disadvantages are resource shortage and high price. Improving its compaction density will cause other electrical properties, especially cycle performance, to decline. There is already little room to increase energy density
Nickel-based ternary materials have the advantages of high capacity, stable cycle performance, and low price. However, compared with lithium cobalt oxide materials, their main disadvantages are low electrical conductivity and low compaction density, which greatly restricts the use of this material in high-temperature applications. Application of Energy Density Li-ion Batteries

Method used

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  • Preparation method for rare-earth-doped high-compaction ternary material
  • Preparation method for rare-earth-doped high-compaction ternary material
  • Preparation method for rare-earth-doped high-compaction ternary material

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Experimental program
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Effect test

Embodiment 1

[0026] Dissolve rare earth oxides in concentrated nitric acid (standard concentrated nitric acid concentration 69.8%), then heat until the oxides are decomposed, and after cooling, use formamide to adjust the molar concentration of rare earth ions to 0.01; first add lithium carbonate powder (D50 2 microns), then according to the R / M (Ni+Co+Mn) molar ratio of 0.0095, add the solution obtained from the rare earth ion solution, then add absolute ethanol according to the solid-to-liquid ratio of 1:1, turn on the main motor of the ball mill, and run for 10 minutes According to the Li / M (Ni+Co+Mn) molar ratio of 1, add the ternary precursor (523 type, D50 is 9 microns), and ball mill for 40 minutes; the material after ball milling is dried in a vacuum dryer, and the drying time is 30 minutes. Then it is fired in a fully automatic roller kiln. The sintering temperature is set as follows: from room temperature to 650 at a rate of 1.5°C / min, then from 750°C to 900°C at a rate of 2°C, an...

Embodiment 2

[0029] Dissolve rare earth oxides in concentrated nitric acid (standard concentrated nitric acid concentration 69.8%), then heat until the oxides are decomposed, and after cooling, adjust the molar concentration of rare earth ions to 0.02 with acetamide; first add lithium carbonate powder (D50 4.25 microns), then according to the R / M (Ni+Co+Mn) molar ratio of 0.015, add the rare earth ion solution to the solution, then add absolute ethanol according to the solid-to-liquid ratio of 1:1, turn on the main motor of the ball mill, and run for 10 minutes According to the Li / M (Ni+Co+Mn) molar ratio of 1.05, add the ternary precursor (523 type, D50 is 10.43 microns), and ball mill for 90 minutes; the material after ball milling is dried in a vacuum dryer, and the drying time is 60 minutes. Then it is fired in a fully automatic roller kiln. The sintering temperature is set as follows: from room temperature to 650 at a rate of 1.5°C / min, then from 750°C to 900°C at a rate of 2°C, and ca...

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Abstract

The invention discloses a preparation method for a rare-earth-doped high-compaction ternary positive material. The preparation method comprises the following steps: adding lithium carbonate powder into a star-shaped ball mill; adding an amides reagent solution of a rare earth oxide (R2O3) into the lithium carbonate powder; then adding a ternary precursor; selecting absolute ethyl alcohol as a liquid medium and carrying out ball milling for 90+ / -30 minutes, wherein the mol ratio of Li / M(Ni+Co+Mn) is 1.05+ / -0.02 and the mol ratio of R / M(Ni+Co+Mn) is 0.010+ / -0.005; drying the materials which are subjected to the ball milling in vacuum; sintering for the first time; dispersing and grading the sintered materials and washing by de-ionized water; sintering for the second time and dispersing to obtain liquid-phase doped rare earth-ternary material powder; putting the powder into a permeation furnace; and expanding and permeating in N2 of 500-650 DEG C for 3-6 hours to obtain target grains. The prepared doped ternary material is compacted and the primary discharging capacity is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of cathode materials for lithium batteries, and in particular relates to a preparation method of a ternary cathode material which improves the compaction and initial discharge capacity of ternary materials by means of rare earth liquid phase-gas phase co-doping. Background technique [0002] Lithium-ion secondary batteries have the advantages of high specific capacity, high working voltage, wide working temperature range, low self-discharge rate, long cycle life, no memory effect, no pollution, light weight, good safety performance, etc., and are widely used in mobile phones, digital Cameras, laptops and other mobile devices. With the development of science and technology, various digital products using lithium-ion batteries are updated and upgraded very quickly, and most of the products tend to be portable and economical. This requires lithium-ion battery products to develop in the direction of high energy ...

Claims

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Application Information

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IPC IPC(8): H01M4/139
CPCY02E60/122H01M4/1391H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 匡建波董杨坚梁朝均范未峰
Owner 四川兴能新材料有限公司
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