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Mixed positive electrode material and preparation method thereof

A positive electrode material and manufacturing method technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of poor cycle performance, poor conductivity, poor thermal stability, etc., to extend the service life, reduce the internal resistance of the battery, and improve the cycle life. Effect

Active Publication Date: 2018-11-06
陕西海恩新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, lithium-ion battery cathode materials mainly include lithium cobalt oxide, lithium nickel oxide, lithium manganate, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminate and lithium iron phosphate. Among them, lithium cobalt oxide is still the mainstream in the market, but cobalt The disadvantages of limited resources, high price, toxic cobalt and poor safety limit the large-scale application of lithium cobalt oxide in the future
The actual capacity of lithium nickelate is higher than that of lithium cobaltate, and the price of nickel is cheaper than that of cobalt, but the preparation of lithium nickelate is difficult and its thermal stability is poor
Lithium manganate has the advantages of abundant raw materials, low price, environmental friendliness, and good thermal stability, but lithium manganate has low capacity and poor cycle performance; nickel-cobalt lithium manganate and nickel-cobalt lithium aluminate have high energy density, but are thermally stable Poor performance; lithium iron phosphate is cheap, rich in resources, good in cycle performance, excellent in thermal stability, and environmentally friendly, but poor in conductivity and low in density. Further application in the field of cathode materials for lithium-ion batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: hybrid positive electrode material, including active material is 76%, conductive agent 10%, oxide 6%, binding agent 8%; Described active material comprises lithium cobaltate and lithium iron phosphate, lithium cobaltate and The stoichiometric ratio of lithium iron phosphate is 5:8.

[0020] The composition raw material of described conducting agent is graphene 65g, activated carbon 32g, monoethanolamine 3g, polyvinylpyrrolidone 5g, xanthan gum 8g and styrene 35g; Production method is as follows: first xanthan gum and styrene are mixed, place Mix evenly at a temperature of 40-45°C to obtain an organic carrier; then add other remaining constituent materials to it, heat to 50-55°C, adjust the ph to neutral, and stir mechanically; then grind on a three-roll mill Mix and grind the slurry to a particle size of 15 microns to obtain the finished product.

[0021] The oxide is a mixture of manganese oxide, ruthenium dioxide, and gallium trioxide, and the mixing ra...

Embodiment 2

[0028] Example 2: In this example, the stoichiometric ratio of lithium cobaltate and lithium iron phosphate is 1:9 as the positive electrode active material, and the other contents are the same as in Example 1.

Embodiment 3

[0029] Example 3: In this example, the stoichiometric ratio of lithium cobaltate and lithium iron phosphate is 11:2 as the positive electrode active material, and the other contents are the same as in Example 1.

[0030] After testing, this embodiment 1 is compared with the traditional battery:

[0031] When the working voltage is high (2.75V~4.2V), the electrical conductivity and high-temperature storage performance of the positive electrode material of the present invention are better than those of traditional batteries; It breaks the characteristics of traditional batteries, especially in terms of overcharge resistance.

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Abstract

The invention discloses a mixed positive electrode material and a preparation method thereof. The mixed positive electrode material comprises the following raw materials: 73-85% of an active material,3-18% of a conductive agent, 5-7% of oxides and 5-12% of a binder, wherein the active material comprises lithium cobalt oxide and lithium iron phosphate. According to the mixed positive electrode material, the compaction density of the positive electrode material is effectively improved through reasonable grinding optimization on the oxides and the active material; the conductivity, the thermal conductivity, the high-temperature storage performance, the cycle performance and the safety performance of a battery are significantly improved through adding multiple oxides; the service life of thepositive electrode material is greatly prolonged; and the problems in cycle performance, high-temperature storage and safety features at high voltage are solved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a mixed positive electrode material and a manufacturing method thereof. Background technique [0002] At present, lithium-ion battery cathode materials mainly include lithium cobalt oxide, lithium nickel oxide, lithium manganate, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminate and lithium iron phosphate. Among them, lithium cobalt oxide is still the mainstream in the market, but cobalt The disadvantages of limited resources, high price, toxic cobalt and poor safety limit the large-scale application of lithium cobalt oxide in the future. The actual capacity of lithium nickelate is higher than that of lithium cobaltate, and the price of nickel is cheaper than that of cobalt. However, the preparation of lithium nickelate is difficult and its thermal stability is poor. Lithium manganate has the advantages of abundant raw materials, lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62
CPCH01M4/364H01M4/625Y02E60/10
Inventor 徐丹军付强
Owner 陕西海恩新材料有限责任公司
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