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Cathode composite active substance for lithium-ion batteries and preparation method of coating slurry thereof

A composite active material, lithium battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of bulging, strong hygroscopicity, and battery scrapping, and achieve the effect of reducing finished products and less pollution

Active Publication Date: 2014-04-09
HEFEI HENGNENG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the excessive number of series and parallel connections and the inevitable error between the energy of each single battery, and the battery management system cannot manage every single single cell, it is easy to cause the battery pack to be damaged during charging and use. The battery is overcharged. As we all know, the battery is prone to a series of negative effects and safety hazards such as lithium precipitation and swelling in the overcharged state.
[0004] The current preparation method of coating slurry in the industry generally uses N-methylpyrrolidone as a solvent in an oil-based process. This solvent has a pungent smell, and long-term exposure is harmful to the human body. Scrap, but the solubility is extremely strong, so the oil-based process has higher requirements on the battery manufacturing environment and is more expensive
Deionized water is low in cost, non-toxic, and has low manufacturing environment requirements, but its solubility is much lower than that of N-methylpyrrolidone and phosphoric acid, making it difficult to directly and evenly disperse positive active materials in deionized water

Method used

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  • Cathode composite active substance for lithium-ion batteries and preparation method of coating slurry thereof

Examples

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Embodiment 1

[0023] A lithium battery cathode composite active material, the cathode composite active material is composed of lithium iron phosphorus oxide and lithium manganese oxide with a weight ratio of 93:8.

[0024] The invention relates to a lithium battery cathode composite active material, wherein the lithium iron phosphorus oxide is lithium iron phosphate, and the lithium manganese oxide is lithium manganese oxide.

[0025] A method for preparing a coating slurry for a positive electrode composite active material of a lithium battery, comprising the following steps:

[0026] (1) Add lithium iron phosphate, lithium manganese oxide, carbon black conductive agent, and deionized water into the mixing tank in proportion to high-viscosity kneading;

[0027] (2) Then add the water-based adhesive and deionized water into the mixing tank in proportion to carry out medium-speed dispersion;

[0028] (3) Then add the graphite conductive agent in proportion to the mixing tank for high-speed ...

comparative example 2

[0048] This example is the preparation method of the conventional coating water-based slurry used in the manufacturing process of the positive electrode active material lithium iron phosphate and lithium manganese oxide battery:

[0049] Make a 100Ah battery according to the conventional production process of lithium iron phosphate, and stir the positive electrode according to the following stirring process

[0050]1. Weigh a certain weight of water-based glue and deionized water according to the recipe process requirements, first add 90% of the weighed amount of deionized water into the mixing tank, then add the weighed amount of water-based glue, turn on the revolution "30Hz" and rotate "25Hz" stirred for 0.5h.

[0051] 2. Weigh a certain weight of carbon black conductive agent and graphite conductive agent according to the recipe process requirements and add them to the water-based glue diluted in the mixing tank, and disperse at high speed at "35Hz" for revolution and "35H...

comparative example 3

[0056] This example is the preparation method of conventional coating water-based slurry used in the manufacturing process of pure lithium iron phosphate battery:

[0057] Make a 100Ah battery according to the conventional production process of lithium iron phosphate, and stir the positive electrode according to the following stirring process

[0058] 1. Weigh a certain weight of water-based glue and deionized water according to the recipe process requirements, first add 90% of the weighed amount of deionized water into the mixing tank, then add the weighed amount of water-based glue, turn on the revolution "30Hz" and rotate "25Hz" stirred for 0.5h.

[0059] 2. Weigh a certain weight of carbon black conductive agent and graphite conductive agent according to the recipe process requirements and add them to the water-based glue diluted in the mixing tank, and disperse at high speed at "35Hz" for revolution and "35Hz" for rotation for 2 hours.

[0060] 3. Weigh a certain weight ...

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Abstract

The invention discloses a cathode composite active substance for lithium-ion batteries and a preparation method of coating slurry thereof. The cathode composite active substance is composed of LiFePO4 and a Li-Mn oxide in a weight ratio of (92-97): (3-8). According to the cathode composite active substance disclosed by the invention, by using the voltage difference of the two kinds of materials relative to graphite and respective advantages of the materials, the overcharge capacity and low-temperature discharge capacity of a monomer battery are improved, therefore, the cycle life of a battery pack is prolonged, and the energy utilization rate and low-temperature discharge rate of the battery pack can be effectively increased. According to the preparation method of coating slurry provided by the invention, by taking deionized water as a solvent, both finished products can be reduced and the pollution can be reduced, and due to the preparation method, various materials can be uniformly mixed and completely dispersed effectively.

Description

technical field [0001] The invention relates to a lithium battery cathode composite active material and a method for preparing the coating slurry thereof, belonging to the field of lithium battery manufacturing. Background technique [0002] With the development of industry, the rapid growth of energy consumption, and the pollution is becoming more and more serious, PM2.5 has become a hot topic, more and more people are beginning to pay attention to the health hazards of air pollutants, "new energy vehicles" Words such as "green transportation" have become the focus. Lithium iron phosphate has the advantages of non-toxic, non-polluting, good safety performance, wide source of raw materials, cheap price, and long life. It has become an ideal cathode material for a new generation of lithium-ion batteries. [0003] At present, new energy systems with high voltage and high capacity are demanded in the market, and the rated voltage of lithium iron phosphate batteries is only abou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/58
CPCY02E60/122H01M4/505H01M4/5825Y02E60/10
Inventor 林彭桃君
Owner HEFEI HENGNENG NEW ENERGY TECH
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