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Method for preparing lithium-manganate positive electrode material of lithium-ion battery

A material lithium manganate, lithium ion battery technology, applied in battery electrodes, manganate/permanganate, circuits, etc., can solve the loss of materials, easy to stick on the wall of the ball mill and the grinding ball, change the raw material distribution. than the problem

Inactive Publication Date: 2013-01-16
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the patent adds a dispersant to the ball mill to improve the dispersion effect, the lithium salt and dopant are easy to stick to the wall of the ball mill and the grinding balls during the mixing process, resulting in loss of final materials, changing the ratio of raw materials, and ultimately affecting Material Consistency

Method used

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  • Method for preparing lithium-manganate positive electrode material of lithium-ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Add 3000ml ethanol solvent into the 5000ml beaker, start the stirrer, according to LiMn 1.92 Cr 0.08 o 4 Stoichiometric ratio, respectively weigh 19.2mol of MnO 2 , 0.8mol of Cr(OH) 3 , 5mol of Li 2 CO 3 Add them to the beaker in turn, start the ultrasonic system, the frequency is 25KHZ, the output power is 2kW, stir for 1 hour, filter, and then dry to obtain the precursor. The precursor was calcined at 1000° C. for 15 hours to obtain doped lithium manganate.

Embodiment 2

[0015] Add 3000ml ethanol solvent into the 5000ml beaker, start the stirrer, according to LiMn 1.92 Cr 0.08 o 4 Stoichiometric ratio, respectively weigh 19.2mol of MnO 2 , 0.8mol of Cr(OH) 3 , 5mol of Li 2 CO 3 Add them to the beaker in turn, start the ultrasonic system, the frequency is 25KHZ, the output power is 2kW, stir for 2 hours, filter, and then dry to obtain the precursor. The precursor was calcined at 1000° C. for 15 hours to obtain doped lithium manganate.

Embodiment 3

[0017] Add 3000ml ethanol solvent into the 5000ml beaker, start the stirrer, according to LiMn 1.92 Cr 0.08 o 4 Stoichiometric ratio, respectively weigh 19.2mol of MnO 2 , 0.8mol of Cr(OH) 3 , 5mol of Li 2 CO 3 Add them to the beaker in turn, start the ultrasonic system, the frequency is 25KHZ, the output power is 4kW, stir for 2 hours, filter, and then dry to obtain the precursor. The precursor was calcined at 1000° C. for 15 hours to obtain doped lithium manganate.

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Abstract

The invention relates to a method for preparing a lithium-manganate positive electrode material of a lithium-ion battery. The method is characterized by comprising the following steps: a manganese compound consisting of MnO2, Mn3O4 and Mn (OH)2 is selected; lithium compound consisting of Li2CO3 and LiOH is selected; a dopant consisting of Cr, La, Ce, Zr, oxide or hydroxide of Ni is selected; the above selected compounds and the dopant are sequentially added into ethanol solvent in accordance with a stoichiometric ratio of LiMn (2-x) MexO4, wherein the Me is a doped modifier, and x is smaller than or equal to 0.1 and larger than or equal to 0; the ethanol solvent is subjected to ultrasound dispersion by a simultaneously opened ultrasound system, and then is filtrated and oven-dried to obtain a lithium manganate precursor; and uniformly doped lithium-manganate is obtained by roasting the precursor at 800-1000 DEG C for 10 to 20 hours.

Description

technical field [0001] The invention belongs to the technical field of powder material preparation, and relates to a preparation method of lithium manganate, a cathode material of a lithium ion battery. Background technique [0002] Lithium ion cathode material lithium manganate has many advantages: high tap density, which can reach 2.0g / cm 3 Above; good low temperature performance; small battery size; low price, can be used to make batteries for electric tools, electric bicycles, hybrid vehicles, etc. However, in actual use, it is found that the lithium manganate cathode material still has some defects. For example, during the charge-discharge cycle, the dislocation of the crystal lattice is prone to occur, resulting in the collapse of the lattice skeleton. This phenomenon occurs at high temperatures (such as 55°C ) is more pronounced. Doping modification is considered to be an effective method to enhance the stability of lithium manganate crystal structure and improve th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/485C01G45/12
CPCY02E60/122Y02E60/10
Inventor 张晓波刘红光叶学海傅春明夏继平于晓微张春丽肖彩英
Owner CHINA NAT OFFSHORE OIL CORP