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Mixed cathode material for lithium ion batteries and preparation method thereof

A lithium-ion battery and positive electrode technology, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of low consistency, cycle life, and limited safety improvement, and achieve the effect of long life

Active Publication Date: 2014-03-26
SUZHOU GCL ENERGY TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The current method of use is mostly for battery manufacturers to purchase raw materials from cathode material manufacturers for simple mixing and use. Due to the performance matching problem of incoming materials, the improvement of cycle life and safety is limited, and the consistency is low.

Method used

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  • Mixed cathode material for lithium ion batteries and preparation method thereof
  • Mixed cathode material for lithium ion batteries and preparation method thereof
  • Mixed cathode material for lithium ion batteries and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] 1. Raw material A is selected as LiMn 1.9 Al 0.05 co 0.05 o 3.98 f 0.02 , average particle size 10μm, specific surface area 0.35m 2 / g, raw material B is LiNi 0.333 co 0.329 mn 0.333 Mg 0.004 o 2 , average particle size 10μm, specific surface area 0.30m 2 / g;

[0051] 2. Put 50wt% of raw material A and 50wt% of raw material B into a polyethylene container with a stirrer, add deionized water equivalent to 3 times the weight of the powder, start the stirrer, and stir at a speed of 500rpm for 20min.

[0052] 3. Add liquid coating agents E and F dropwise to the polyethylene container filled with materials and dispersants through two peristaltic pumps, wherein E is a lithium hydroxide aqueous solution with a concentration of 0.2mol / l, and F is a concentration of 0.2mol / l Aluminum nitrate aqueous solution. Control the dripping amount of the aluminum nitrate aqueous solution so that the aluminum element in the dripping solution accounts for 1.0% of the molar amo...

Embodiment 2

[0055] 1. Raw material A is selected as LiMn 1.9 Al 0.05 Mg 0.05 o 3.98 f 0.02 , average particle size 10μm, specific surface area 0.35m 2 / g, raw material B is LiNi 0.333 co 0.329 mn 0.333 Ti 0.002 Mg 0.002 o 2 , average particle size 10μm, specific surface area 0.30m 2 / g;

[0056] 2. Put 50wt% of raw material A and 50wt% of raw material B into a polyethylene container with a stirrer, add deionized water equivalent to 3 times the weight of the powder, start the stirrer, and stir at a speed of 500rpm for 20min.

[0057] 3. Liquid coating agents E and F are added dropwise to the polyethylene container filled with materials and dispersants through two peristaltic pumps, wherein E is the ammonium phosphate aqueous solution with a concentration of 0.2mol / l, and F is the ammonium phosphate solution with a concentration of 0.2mol / l. Aqueous solution of aluminum nitrate. Control the dripping amount of the aluminum nitrate aqueous solution so that the aluminum element...

Embodiment 3

[0060] 1. Raw material A is selected as LiMn 1.9 Al 0.05 Mg 0.05 o 3.98 f 0.02 , average particle size 10μm, specific surface area 0.35m 2 / g, raw material B is LiNi 0.333 co 0.329 mn 0.333 Ti 0.002 Mg 0.002 o 2 , average particle size 10μm, specific surface area 0.30m 2 / g, raw material C-site LiNi 0.5 co 0.196 mn 0.3 Al 0.004 o 2 , average particle size 10μm, specific surface area 0.35m 2 / g;

[0061] 2. Put 50wt% of raw material A, 30wt% of raw material B, and 20wt% of raw material C into a polyethylene container with a stirrer, add deionized water equivalent to 3 times the weight of the powder, start the stirrer, and stir at a speed of 500rpm for 20min .

[0062] 3. Add liquid coating agents E and F dropwise to the polyethylene container filled with materials and dispersants through two peristaltic pumps, wherein E is a lithium hydroxide aqueous solution with a concentration of 0.2mol / l, and F is a concentration of 0.2mol / l aqueous solution of zinc ni...

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Abstract

The invention relates to the field of batteries, and in particular relates to a long-life, high-energy density and low-cost mixed cathode material for lithium ion secondary batteries and a preparation method thereof. The mixed cathode material for the lithium ion batteries, provided by the invention, comprises the following raw components in percentage by weight: 20-60% of doped lithium-manganese spinel composite oxide and 40-80% of doped lithium-nickel-cobalt-manganese composite oxide. According to the mixed cathode material for the lithium ion batteries, provided by the invention, proper doping is carried out on lithium-manganese spinel to ensure that the lattice imperfection can be effectively reduced, the crystal structure is stabilized, the lattice distortion is restrained, the manganese dissolution is reduced, the cycle life is prolonged, the large current charge-discharge property and safety performance can be improved so as to satisfy the important requirements on the lithium ion batteries for EV (Electric Vehicles) and HEV (Hybrid Electric Vehicles); for the lithium-nickel-cobalt-manganese composite oxide of a layered structure, the doping has the same effect and the cycle performance, the rate performance and the safety performance can be better improved.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a hybrid positive electrode material of a lithium-ion secondary battery with high service life, high energy density and lower cost and a preparation method thereof. Background technique [0002] With the rising energy prices and increasing environmental pressure, the automotive industry's demand for new energy power technologies has grown rapidly. Lithium-ion batteries are now regarded as a new power source by more and more companies and researchers, which urgently requires the development of lithium-ion battery cathode materials with high safety, high energy density, high power, long cycle, high environmental protection and low price . [0003] Based on safety and cost considerations, lithium manganese spinel cathode material is now considered to be an advantageous cathode material for lithium-ion batteries for power use. However, during the charging and discharging process, especiall...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/62
CPCH01M4/505H01M4/525Y02E60/10
Inventor 卢永强孙化雨
Owner SUZHOU GCL ENERGY TECH DEV CO LTD
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