Preparation method of lithium-rich anode material

A lithium-rich cathode material and slurry technology, which is applied in the field of preparation of lithium-rich cathode materials, can solve the problems of complex preparation process, increase of industrial cost, and restriction of development, and achieve the effects of reduced process, low cost, and reduced low-temperature roasting process

Active Publication Date: 2013-05-08
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This preparation process is relatively complicated, and there are requirements on the temperature of the reaction solution and the pH value of the solution, and the materials prepared by this method need to be heat-treated in an oxygen atmosphere, which increases the industrial cost and limits its development.

Method used

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  • Preparation method of lithium-rich anode material
  • Preparation method of lithium-rich anode material
  • Preparation method of lithium-rich anode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Weigh 103.97g of lithium carbonate, 145.56g of manganese carbonate, 17.97g of cobalt metal and 22.77g of nickelous oxide, mix them, add 800ml of deionized water, and add them to a fine grinder for fine grinding. After testing, D 50 0.09 micron, then take it out, add it to the ultra-fine grinding machine for ultra-fine grinding, the D after ultra-fine grinding 50 is 0.045 microns. Spray drying, the D of the primary particles after spray drying 50 It is 0.046 microns, and the spherical secondary particles formed are 3-15 microns. The powder obtained after spray drying was calcined at 850°C for 48 hours, cooled with the furnace, and the obtained powder was ground and passed through a 300-mesh sieve. After analysis, the composition of the prepared lithium-rich cathode material is 0.6Li 2 O 0.8Mn 0.675 Ni 0.1625 co 0.1625 o 1.75 . The particle size of primary particles after sintering is 0.8-1 micron, and the particle size of secondary particles formed is D 50 is 16...

Embodiment 2

[0049] Weigh 103.97g of lithium carbonate, 145.56g of manganese carbonate, 17.97g of metal cobalt and 22.77g of nickelous oxide, add them to the coarse grinding tank, add 350ml of deionized water, mix them, and put them on the coarse grinder for rough grinding for 24 hours. After testing, the D of primary particles 50 0.8 microns. Then add 1000ml deionized water for fine grinding. After the particle size test, the D of the primary particle 50 is 0.07 microns. Then add 400ml of deionized water for ultra-fine grinding, after the particle size test, the D of a particle 50 is 0.02 microns. Spray drying, the D of the primary particles after spray drying 50 0.02 microns, and the formed spherical secondary particles are 3-15 microns. The powder obtained after spray drying was calcined at 850°C for 48 hours, cooled with the furnace, and the obtained powder was ground and passed through a 300-mesh sieve. After analysis, the composition of the prepared lithium-rich cathode materia...

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Abstract

The invention discloses a preparation method of a lithium-rich anode material having a chemical formula of xLi2O.yMOb (wherein M is at least one of Mn, Ni, Co and Al, x/y is greater than 0.51 and lower than 0.95, and b is not lower than 1 and not greater than 2). The method comprises the following steps: 1, weighing raw materials comprising a lithium sauce and at least one of a manganese source, a cobalt source, a nickel source and an aluminum source according to the molar ratio in xLi2O.yMOb; 2, adding a liquid into the raw materials, and grinding to form a slurry, wherein the median particle size D50 of particles of the slurry is less than 0.05mum; 3, drying the slurry in a spray manner; and 4, roasting the material obtained after drying. The method has the advantages of simple process and easy industrialized production; the primary particles of the obtained powder are small, and the secondary particles are spherical in shape; and the lithium-rich anode material prepared through adopting the method has a large discharge specific capacity, and the specific energy of the lithium ion battery prepared through using the lithium-rich anode material is high.

Description

technical field [0001] The invention relates to the field of positive electrode materials of lithium ion batteries, in particular to a preparation method of lithium-rich positive electrode materials. Background technique [0002] Since Sony successfully developed a new lithium-ion battery in 1990, lithium-ion batteries have developed rapidly. It has the advantages of high working voltage, light weight, long cycle life, wide operating range, no memory effect, no pollution, etc., thus replacing traditional batteries such as cadmium-nickel batteries, nickel-metal hydride batteries and lead-acid batteries, and is widely used in notebook computers , mobile phones, digital phones and other small civilian electronic products. With the substantial increase in the specific energy of lithium-ion batteries, lithium-ion batteries have gradually become the power source for large vehicles such as buses, electric vehicles, and hybrid vehicles, light electric vehicles such as electric bicy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/485H01M4/131H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 卢世刚庄卫东孙学义王忠尹艳萍卢华权
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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